{
 "instance": {
  "cohu20200630_10q.htm": {
   "axisCustom": 0,
   "axisStandard": 35,
   "contextCount": 299,
   "dts": {
    "calculationLink": {
     "local": [
      "cohu-20200627_cal.xml"
     ]
    },
    "definitionLink": {
     "local": [
      "cohu-20200627_def.xml"
     ],
     "remote": [
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-eedm-def-2020-01-31.xml",
      "http://xbrl.fasb.org/srt/2020/elts/srt-eedm1-def-2020-01-31.xml"
     ]
    },
    "inline": {
     "local": [
      "cohu20200630_10q.htm"
     ]
    },
    "labelLink": {
     "local": [
      "cohu-20200627_lab.xml"
     ],
     "remote": [
      "https://xbrl.sec.gov/dei/2019/dei-doc-2019-01-31.xml",
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-doc-2020-01-31.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "cohu-20200627_pre.xml"
     ]
    },
    "referenceLink": {
     "remote": [
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-ref-2020-01-31.xml",
      "https://xbrl.sec.gov/dei/2019/dei-ref-2019-01-31.xml"
     ]
    },
    "schema": {
     "local": [
      "cohu-20200627.xsd"
     ],
     "remote": [
      "https://xbrl.sec.gov/sic/2020/sic-2020-01-31.xsd",
      "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xl-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
      "http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd",
      "https://xbrl.sec.gov/exch/2020/exch-2020-01-31.xsd",
      "http://xbrl.sec.gov/naics/2011/naics-2011-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-roles-2020-01-31.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd",
      "http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd",
      "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
      "http://xbrl.fasb.org/srt/2020/elts/srt-types-2020-01-31.xsd",
      "http://xbrl.fasb.org/srt/2020/elts/srt-roles-2020-01-31.xsd",
      "https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-types-2020-01-31.xsd",
      "https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd",
      "https://xbrl.sec.gov/currency/2020/currency-2020-01-31.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd",
      "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd",
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-parts-codification-2020-01-31.xsd",
      "http://www.xbrl.org/lrr/role/deprecated-2009-12-16.xsd"
     ]
    }
   },
   "elementCount": 592,
   "entityCount": 1,
   "hidden": {
    "http://fasb.org/us-gaap/2020-01-31": 47,
    "http://www.cohu.com/20200627": 1,
    "http://xbrl.sec.gov/dei/2019-01-31": 6,
    "total": 54
   },
   "keyCustom": 46,
   "keyStandard": 403,
   "memberCustom": 33,
   "memberStandard": 44,
   "nsprefix": "cohu",
   "nsuri": "http://www.cohu.com/20200627",
   "report": {
    "R1": {
     "firstAnchor": {
      "ancestors": [
       "b",
       "p",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "document",
     "isDefault": "true",
     "longName": "000 - Document - Document And Entity Information",
     "role": "http://www.cohu.com/20200627/role/statement-document-and-entity-information",
     "shortName": "Document And Entity Information",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "b",
       "p",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R10": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SignificantAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "009 - Disclosure - Note 1 - Summary of Significant Accounting Policies",
     "role": "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
     "shortName": "Note 1 - Summary of Significant Accounting Policies",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SignificantAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R11": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "010 - Disclosure - Note 2 - Goodwill and Purchased Intangible Assets",
     "role": "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets",
     "shortName": "Note 2 - Goodwill and Purchased Intangible Assets",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R12": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "011 - Disclosure - Note 3 - Borrowings and Credit Agreements",
     "role": "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
     "shortName": "Note 3 - Borrowings and Credit Agreements",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R13": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "012 - Disclosure - Note 4 - Restructuring Charges",
     "role": "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges",
     "shortName": "Note 4 - Restructuring Charges",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R14": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueMeasurementInputsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "013 - Disclosure - Note 5 - Financial Instruments Measured at Fair Value",
     "role": "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value",
     "shortName": "Note 5 - Financial Instruments Measured at Fair Value",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueMeasurementInputsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R15": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "014 - Disclosure - Note 6 - Employee Stock Benefit Plans",
     "role": "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
     "shortName": "Note 6 - Employee Stock Benefit Plans",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R16": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:IncomeTaxDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "015 - Disclosure - Note 7 - Income Taxes",
     "role": "http://www.cohu.com/20200627/role/statement-note-7-income-taxes",
     "shortName": "Note 7 - Income Taxes",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:IncomeTaxDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R17": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SegmentReportingDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "016 - Disclosure - Note 8 - Segment and Geographic Information",
     "role": "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information",
     "shortName": "Note 8 - Segment and Geographic Information",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SegmentReportingDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R18": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "cohu:LesseeLeasesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "017 - Disclosure - Note 9 - Leases",
     "role": "http://www.cohu.com/20200627/role/statement-note-9-leases",
     "shortName": "Note 9 - Leases",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "cohu:LesseeLeasesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R19": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "018 - Disclosure - Note 10 - Discontinued Operations",
     "role": "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations",
     "shortName": "Note 10 - Discontinued Operations",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R2": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "001 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited)",
     "role": "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
     "shortName": "Condensed Consolidated Balance Sheets (Current Period Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R20": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LossContingencyDisclosures",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "019 - Disclosure - Note 11 - Contingencies",
     "role": "http://www.cohu.com/20200627/role/statement-note-11-contingencies",
     "shortName": "Note 11 - Contingencies",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LossContingencyDisclosures",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R21": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsContingenciesAndGuaranteesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "020 - Disclosure - Note 12 - Guarantees",
     "role": "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
     "shortName": "Note 12 - Guarantees",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsContingenciesAndGuaranteesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R22": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BasisOfAccountingPolicyPolicyTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "021 - Disclosure - Significant Accounting Policies (Policies)",
     "role": "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies",
     "shortName": "Significant Accounting Policies (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BasisOfAccountingPolicyPolicyTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R23": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:InventoryPolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "022 - Disclosure - Note 1 - Summary of Significant Accounting Policies (Tables)",
     "role": "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables",
     "shortName": "Note 1 - Summary of Significant Accounting Policies (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:InventoryPolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R24": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfGoodwillTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "023 - Disclosure - Note 2 - Goodwill and Purchased Intangible Assets (Tables)",
     "role": "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-tables",
     "shortName": "Note 2 - Goodwill and Purchased Intangible Assets (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfGoodwillTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R25": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDebtTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "024 - Disclosure - Note 3 - Borrowings and Credit Agreements (Tables)",
     "role": "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-tables",
     "shortName": "Note 3 - Borrowings and Credit Agreements (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDebtTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R26": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfRestructuringAndRelatedCostsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "025 - Disclosure - Note 4 - Restructuring Charges (Tables)",
     "role": "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-tables",
     "shortName": "Note 4 - Restructuring Charges (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfRestructuringAndRelatedCostsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R27": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:FairValueMeasurementInputsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "026 - Disclosure - Note 5 - Financial Instruments Measured at Fair Value (Tables)",
     "role": "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-tables",
     "shortName": "Note 5 - Financial Instruments Measured at Fair Value (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:FairValueMeasurementInputsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R28": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:SegmentReportingDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "027 - Disclosure - Note 8 - Segment and Geographic Information (Tables)",
     "role": "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-tables",
     "shortName": "Note 8 - Segment and Geographic Information (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:SegmentReportingDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R29": {
     "firstAnchor": {
      "ancestors": [
       "cohu:LesseeLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "cohu:LeasesBalanceSheetInformationTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "028 - Disclosure - Note 9 - Leases (Tables)",
     "role": "http://www.cohu.com/20200627/role/statement-note-9-leases-tables",
     "shortName": "Note 9 - Leases (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "cohu:LesseeLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "cohu:LeasesBalanceSheetInformationTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R3": {
     "firstAnchor": null,
     "groupType": "statement",
     "isDefault": "false",
     "longName": "002 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)",
     "role": "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals",
     "shortName": "Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": null
    },
    "R30": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "029 - Disclosure - Note 10 - Discontinued Operations (Tables)",
     "role": "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-tables",
     "shortName": "Note 10 - Discontinued Operations (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R31": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:CommitmentsContingenciesAndGuaranteesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfProductWarrantyLiabilityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "030 - Disclosure - Note 12 - Guarantees (Tables)",
     "role": "http://www.cohu.com/20200627/role/statement-note-12-guarantees-tables",
     "shortName": "Note 12 - Guarantees (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:CommitmentsContingenciesAndGuaranteesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfProductWarrantyLiabilityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R32": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:GoodwillAndIntangibleAssetsPolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-10-01_2019-10-01",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:GoodwillAndIntangibleAssetImpairment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "031 - Disclosure - Note 1 - Summary of Significant Accounting Policies (Details Textual)",
     "role": "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
     "shortName": "Note 1 - Summary of Significant Accounting Policies (Details Textual)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:GoodwillAndIntangibleAssetsPolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-10-01_2019-10-01",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:GoodwillAndIntangibleAssetImpairment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R33": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
       "us-gaap:InventoryPolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:InventoryRawMaterialsAndSuppliesNetOfReserves",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "032 - Disclosure - Note 1 - Summary of Significant Accounting Policies - Inventories (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details",
     "shortName": "Note 1 - Summary of Significant Accounting Policies - Inventories (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
       "us-gaap:InventoryPolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:InventoryRawMaterialsAndSuppliesNetOfReserves",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R34": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:PropertyPlantAndEquipmentTextBlock",
       "us-gaap:PropertyPlantAndEquipmentPolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:PropertyPlantAndEquipmentGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "033 - Disclosure - Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details",
     "shortName": "Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:PropertyPlantAndEquipmentTextBlock",
       "us-gaap:PropertyPlantAndEquipmentPolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:PropertyPlantAndEquipmentGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R35": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock",
       "us-gaap:ShareBasedCompensationOptionAndIncentivePlansPolicy",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AllocatedShareBasedCompensationExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "034 - Disclosure - Note 1 - Summary of Significant Accounting Policies - Reported Share-based Compensation (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details",
     "shortName": "Note 1 - Summary of Significant Accounting Policies - Reported Share-based Compensation (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock",
       "us-gaap:ShareBasedCompensationOptionAndIncentivePlansPolicy",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AllocatedShareBasedCompensationExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R36": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:WeightedAverageNumberOfSharesOutstandingBasic",
      "reportCount": 1,
      "unitRef": "Share",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "035 - Disclosure - Note 1 - Summary of Significant Accounting Policies - Computation of Basic and Diluted Income (Loss) Per Share (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details",
     "shortName": "Note 1 - Summary of Significant Accounting Policies - Computation of Basic and Diluted Income (Loss) Per Share (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
       "us-gaap:EarningsPerSharePolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Share",
      "xsiNil": "false"
     }
    },
    "R37": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "036 - Disclosure - Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details",
     "shortName": "Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:DisaggregationOfRevenueTableTextBlock",
       "us-gaap:RevenueRecognitionPolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27_ProductOrServiceAxis-SystemsMember_StatementBusinessSegmentsAxis-SemiconductorTestAndInspectionMember",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R38": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:SchedulesOfConcentrationOfRiskByRiskFactorTextBlock",
       "us-gaap:RevenueRecognitionPolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-03-30_2019-06-29_ConcentrationRiskByBenchmarkAxis-SalesRevenueNetMember_ConcentrationRiskByTypeAxis-CustomerConcentrationRiskMember_StatementBusinessSegmentsAxis-SemiconductorTestAndInspectionMember",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "cohu:NumberOfMajorCustomers",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Pure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "037 - Disclosure - Note 1 - Summary of Significant Accounting Policies - Customer Concentration (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details",
     "shortName": "Note 1 - Summary of Significant Accounting Policies - Customer Concentration (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:SchedulesOfConcentrationOfRiskByRiskFactorTextBlock",
       "us-gaap:RevenueRecognitionPolicyTextBlock",
       "us-gaap:SignificantAccountingPoliciesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-03-30_2019-06-29_ConcentrationRiskByBenchmarkAxis-SalesRevenueNetMember_ConcentrationRiskByTypeAxis-CustomerConcentrationRiskMember_StatementBusinessSegmentsAxis-SemiconductorTestAndInspectionMember",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "cohu:NumberOfMajorCustomers",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Pure",
      "xsiNil": "false"
     }
    },
    "R39": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "038 - Disclosure - Note 2 - Goodwill and Purchased Intangible Assets (Details Textual)",
     "role": "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual",
     "shortName": "Note 2 - Goodwill and Purchased Intangible Assets (Details Textual)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2019-12-28_IndefiniteLivedIntangibleAssetsByMajorClassAxis-InProcessTechnologyMember",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R4": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "003 - Statement - Condensed Consolidated Statements of Operations (Unaudited)",
     "role": "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
     "shortName": "Condensed Consolidated Statements of Operations (Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R40": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2019-12-28",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:Goodwill",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "039 - Disclosure - Note 2 - Goodwill and Purchased Intangible Assets - Changes in Carrying Value of Goodwill (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details",
     "shortName": "Note 2 - Goodwill and Purchased Intangible Assets - Changes in Carrying Value of Goodwill (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfGoodwillTextBlock",
       "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2018-12-29",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:Goodwill",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R41": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "cohu:ScheduleOfFinitelivedAndIndefinitelivedIntangibleAssetsTableTextBlock",
       "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FiniteLivedIntangibleAssetsGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "040 - Disclosure - Note 2 - Goodwill and Purchased Intangible Assets - Purchased Intangible Assets (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details",
     "shortName": "Note 2 - Goodwill and Purchased Intangible Assets - Purchased Intangible Assets (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "cohu:ScheduleOfFinitelivedAndIndefinitelivedIntangibleAssetsTableTextBlock",
       "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FiniteLivedIntangibleAssetsGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R42": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfDebtTableTextBlock",
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LongTermDebtCurrent",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "041 - Disclosure - Note 3 - Borrowings and Credit Agreements (Details Textual)",
     "role": "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
     "shortName": "Note 3 - Borrowings and Credit Agreements (Details Textual)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:LongTermDebtFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R43": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfDebtTableTextBlock",
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LineOfCredit",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "042 - Disclosure - Note 3 - Borrowings and Credit Agreements - Summary of Borrowings (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details",
     "shortName": "Note 3 - Borrowings and Credit Agreements - Summary of Borrowings (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfDebtTableTextBlock",
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "lang": null,
      "name": "cohu:DebtLongtermAndShorttermCombinedAmountGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R44": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:RestructuringCharges",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "043 - Disclosure - Note 4 - Restructuring Charges (Details Textual)",
     "role": "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-details-textual",
     "shortName": "Note 4 - Restructuring Charges (Details Textual)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R45": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:RestructuringCharges",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "044 - Disclosure - Note 4 - Restructuring Charges - Charges Related to the Wind Down Plan (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details",
     "shortName": "Note 4 - Restructuring Charges - Charges Related to the Wind Down Plan (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfRestructuringAndRelatedCostsTextBlock",
       "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2019-12-28_RestructuringCostAndReserveAxis-EmployeeSeveranceMember_RestructuringPlanAxis-IntegrationProgramMember",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:RestructuringReserve",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R46": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:FairValueMeasurementInputsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2019-12-28",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "045 - Disclosure - Note 5 - Financial Instruments Measured at Fair Value (Details Textual)",
     "role": "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-details-textual",
     "shortName": "Note 5 - Financial Instruments Measured at Fair Value (Details Textual)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:FairValueMeasurementInputsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2019-12-28",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R47": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-4",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesCurrent",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "046 - Disclosure - Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details",
     "shortName": "Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:AvailableForSaleSecuritiesTextBlock",
       "us-gaap:FairValueMeasurementInputsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27_InvestmentTypeAxis-ForeignGovernmentDebtSecuritiesMember",
      "decimals": "-4",
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesAmortizedCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R48": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
       "us-gaap:FairValueMeasurementInputsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-4",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "047 - Disclosure - Note 5 - Financial Instruments Measured at Fair Value - Effective Maturities of Short-term Investments (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details",
     "shortName": "Note 5 - Financial Instruments Measured at Fair Value - Effective Maturities of Short-term Investments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
       "us-gaap:FairValueMeasurementInputsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-4",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R49": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock",
       "us-gaap:FairValueMeasurementInputsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AssetsFairValueDisclosure",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "048 - Disclosure - Note 5 - Financial Instruments Measured at Fair Value - Assets Measured at Fair Value on Recurring Basis (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details",
     "shortName": "Note 5 - Financial Instruments Measured at Fair Value - Assets Measured at Fair Value on Recurring Basis (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock",
       "us-gaap:FairValueMeasurementInputsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27_FairValueByMeasurementFrequencyAxis-FairValueMeasurementsRecurringMember",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AssetsFairValueDisclosure",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R5": {
     "firstAnchor": null,
     "groupType": "statement",
     "isDefault": "false",
     "longName": "004 - Statement - Condensed Consolidated Statements of Operations (Unaudited) (Parentheticals)",
     "role": "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited-parentheticals",
     "shortName": "Condensed Consolidated Statements of Operations (Unaudited) (Parentheticals)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": null
    },
    "R50": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Share",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "049 - Disclosure - Note 6 - Employee Stock Benefit Plans (Details Textual)",
     "role": "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual",
     "shortName": "Note 6 - Employee Stock Benefit Plans (Details Textual)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Share",
      "xsiNil": "false"
     }
    },
    "R51": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:IncomeTaxDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "us-gaap:EffectiveIncomeTaxRateContinuingOperations",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Pure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "050 - Disclosure - Note 7 - Income Taxes (Details Textual)",
     "role": "http://www.cohu.com/20200627/role/statement-note-7-income-taxes-details-textual",
     "shortName": "Note 7 - Income Taxes (Details Textual)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:IncomeTaxDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "us-gaap:EffectiveIncomeTaxRateContinuingOperations",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Pure",
      "xsiNil": "false"
     }
    },
    "R52": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "051 - Disclosure - Note 8 - Segment and Geographic Information - Summary of Current Segments (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details",
     "shortName": "Note 8 - Segment and Geographic Information - Summary of Current Segments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
       "us-gaap:SegmentReportingDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-4",
      "lang": null,
      "name": "cohu:ProfitLossFromOperatingSegment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R53": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "cohu:LesseeLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LesseeOperatingLeaseRenewalTerm",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "052 - Disclosure - Note 9 - Leases (Details Textual)",
     "role": "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual",
     "shortName": "Note 9 - Leases (Details Textual)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "cohu:LesseeLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LesseeOperatingLeaseRenewalTerm",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R54": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeaseRightOfUseAsset",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "053 - Disclosure - Note 9 - Leases - Balance Sheet Information (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details",
     "shortName": "Note 9 - Leases - Balance Sheet Information (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "cohu:LeasesBalanceSheetInformationTableTextBlock",
       "cohu:LesseeLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:FinanceLeaseRightOfUseAsset",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R55": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:LeaseCostTableTextBlock",
       "cohu:LesseeLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeaseCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "054 - Disclosure - Note 9 - Leases - Lease Expense (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details",
     "shortName": "Note 9 - Leases - Lease Expense (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:LeaseCostTableTextBlock",
       "cohu:LesseeLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeaseCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R56": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "cohu:LesseeLeaseLiabilityMaturityTableTextBlock",
       "cohu:LesseeLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "055 - Disclosure - Note 9 - Leases - Future Minimum Lease Payments (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details",
     "shortName": "Note 9 - Leases - Future Minimum Lease Payments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "cohu:LesseeLeaseLiabilityMaturityTableTextBlock",
       "cohu:LesseeLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R57": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "cohu:LeaseCashFlowInformationTableTextBlock",
       "cohu:LesseeLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeasePayments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "056 - Disclosure - Note 9 - Leases - Cash Flow Information (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-9-leases-cash-flow-information-details",
     "shortName": "Note 9 - Leases - Cash Flow Information (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "cohu:LeaseCashFlowInformationTableTextBlock",
       "cohu:LesseeLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeasePayments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R58": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2018-12-30_2019-12-28_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis-FixturesServicesBusinessFSGMember",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "cohu:DisposalGroupIncludingDiscontinuedOperationImpairment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "057 - Disclosure - Note 10 - Discontinued Operations (Details Textual)",
     "role": "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-details-textual",
     "shortName": "Note 10 - Discontinued Operations (Details Textual)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2018-12-30_2019-12-28_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis-FixturesServicesBusinessFSGMember",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "cohu:DisposalGroupIncludingDiscontinuedOperationImpairment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R59": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "058 - Disclosure - Note 10 - Discontinued Operations - Balance Sheet Information for Fixture Services Business (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details",
     "shortName": "Note 10 - Discontinued Operations - Balance Sheet Information for Fixture Services Business (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock",
       "us-gaap:DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2019-12-28_DisposalGroupClassificationAxis-DiscontinuedOperationsHeldforsaleMember_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis-FixturesServicesBusinessFSGMember",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R6": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-4",
      "first": true,
      "lang": null,
      "name": "us-gaap:ProfitLoss",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "005 - Statement - Condensed Consolidated Statements of Comprehensive Loss (Unaudited)",
     "role": "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited",
     "shortName": "Condensed Consolidated Statements of Comprehensive Loss (Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:OtherComprehensiveIncomeLossNetOfTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R60": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock",
       "us-gaap:DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "059 - Disclosure - Note 10 - Discontinued Operations - Summary of Operating Results (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details",
     "shortName": "Note 10 - Discontinued Operations - Summary of Operating Results (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock",
       "us-gaap:DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R61": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:CommitmentsContingenciesAndGuaranteesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27_BalanceSheetLocationAxis-NoncurrentOtherAccruedLiabilitiesMember",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:ProductWarrantyAccrualNoncurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "060 - Disclosure - Note 12 - Guarantees (Details Textual)",
     "role": "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual",
     "shortName": "Note 12 - Guarantees (Details Textual)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:CommitmentsContingenciesAndGuaranteesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-06-27_BalanceSheetLocationAxis-NoncurrentOtherAccruedLiabilitiesMember",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:ProductWarrantyAccrualNoncurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R62": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfProductWarrantyLiabilityTableTextBlock",
       "us-gaap:CommitmentsContingenciesAndGuaranteesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-03-28",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ProductWarrantyAccrual",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "061 - Disclosure - Note 12 - Guarantees - Changes in Accrued Warranty (Details)",
     "role": "http://www.cohu.com/20200627/role/statement-note-12-guarantees-changes-in-accrued-warranty-details",
     "shortName": "Note 12 - Guarantees - Changes in Accrued Warranty (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "us-gaap:ScheduleOfProductWarrantyLiabilityTableTextBlock",
       "us-gaap:CommitmentsContingenciesAndGuaranteesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2020-03-28",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ProductWarrantyAccrual",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R7": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2018-12-29_AdjustmentsForNewAccountingPronouncementsAxis-AccountingStandardsUpdate201602Member_CumulativeEffectPeriodOfAdoptionAxis-CumulativeEffectPeriodOfAdoptionAdjustmentMember_StatementEquityComponentsAxis-CommonStockMember",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "006 - Statement - Consolidated Statements of Stockholders' Equity (Unaudited)",
     "role": "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
     "shortName": "Consolidated Statements of Stockholders' Equity (Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "i_2018-12-29_AdjustmentsForNewAccountingPronouncementsAxis-AccountingStandardsUpdate201602Member_CumulativeEffectPeriodOfAdoptionAxis-CumulativeEffectPeriodOfAdoptionAdjustmentMember_StatementEquityComponentsAxis-CommonStockMember",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    },
    "R8": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2020-03-29_2020-06-27",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:CommonStockDividendsPerShareDeclared",
      "reportCount": 1,
      "unitRef": "USDPerShare",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "007 - Statement - Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals)",
     "role": "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited-parentheticals",
     "shortName": "Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": null
    },
    "R9": {
     "firstAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:NetIncomeLoss",
      "reportCount": 1,
      "unitRef": "USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "008 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)",
     "role": "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited",
     "shortName": "Condensed Consolidated Statements of Cash Flows (Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "td",
       "tr",
       "tbody",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "cohu20200630_10q.htm",
      "contextRef": "d_2019-12-29_2020-06-27",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:GainLossOnDispositionOfAssets1",
      "reportCount": 1,
      "unique": true,
      "unitRef": "USD",
      "xsiNil": "false"
     }
    }
   },
   "segmentCount": 79,
   "tag": {
    "cohu_ALBSMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents information pertaining to ALBS Solutions Sdn Bhd.",
        "label": "ALBS [Member]"
       }
      }
     },
     "localname": "ALBSMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_AmortizationOfInventoryStepupAndInventoryRelatedCharges": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 6.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The adjustment related to the amortization of inventory step-up and inventory related charges.",
        "label": "Amortization of inventory step-up and inventory related charges"
       }
      }
     },
     "localname": "AmortizationOfInventoryStepupAndInventoryRelatedCharges",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_AssetsHeldForSalePolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for assets held-for-sale for fiscal year end.",
        "label": "Assets Held-for-sale [Policy Text Block]"
       }
      }
     },
     "localname": "AssetsHeldForSalePolicyTextBlock",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "cohu_AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearThroughThreeYearsEstimatedFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details": {
       "order": 0.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The estimated fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through third fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Due after one year through three years, fair value"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearThroughThreeYearsEstimatedFairValue",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_AvailableforsaleSecuritiesDebtMaturitiesYearTwoThroughThreeAmortizedCostBasis": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details": {
       "order": 0.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the third fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Due after one year through three years, amortized cost"
       }
      }
     },
     "localname": "AvailableforsaleSecuritiesDebtMaturitiesYearTwoThroughThreeAmortizedCostBasis",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_CapitalizedCloudComputingServiceCostsButNotYetPaid": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Future cash outflow to pay for capitalized cloud computing service costs that have occurred.",
        "label": "Capitalized cloud computing service costs included in accounts payable"
       }
      }
     },
     "localname": "CapitalizedCloudComputingServiceCostsButNotYetPaid",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_ConstructionLoanMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A borrowing arrangement which provides the entity constructing a facility (such as a building and a landfill) with funds to effect construction, generally on a draw down, or as needed, basis.",
        "label": "Construction Loan [Member]"
       }
      }
     },
     "localname": "ConstructionLoanMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_DebtInstrumentAmortizationPercentageOfPrincipalAmount": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of quarterly installments of the original principal, with balance payable at maturity.",
        "label": "cohu_DebtInstrumentAmortizationPercentageOfPrincipalAmount",
        "terseLabel": "Debt Instrument, Amortization, Percentage of Principal Amount"
       }
      }
     },
     "localname": "DebtInstrumentAmortizationPercentageOfPrincipalAmount",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "percentItemType"
    },
    "cohu_DebtInstrumentPrincipalPaymentTerms": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The period of principal payments pursuant to the debt agreement.",
        "label": "cohu_DebtInstrumentPrincipalPaymentTerms",
        "terseLabel": "Debt Instrument, Principal Payment Terms (Year)"
       }
      }
     },
     "localname": "DebtInstrumentPrincipalPaymentTerms",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "durationItemType"
    },
    "cohu_DebtLongtermAndShorttermCombinedAmountGross": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the aggregate of total long-term debt, including current maturities and short-term debt, before financing fees and discount.",
        "label": "Total debt"
       }
      }
     },
     "localname": "DebtLongtermAndShorttermCombinedAmountGross",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_DeferredProfit": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 7.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying value of deferred revenue, net of expenses, as of the balance sheet date that is expected to be recognized as such within one year or the normal operating cycle, if longer.",
        "label": "Deferred profit",
        "terseLabel": "Deferred Profit"
       }
      }
     },
     "localname": "DeferredProfit",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_DeferredProfitLongterm": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "he carrying value of deferred revenue, net of expenses, as of the balance sheet date that is expected to be recognized as such after one year.",
        "label": "cohu_DeferredProfitLongterm",
        "terseLabel": "Deferred Profit Long-term"
       }
      }
     },
     "localname": "DeferredProfitLongterm",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_DisposalGroupIncludingDiscontinuedOperationImpairment": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of impairment attributable to disposal group, including, but not limited to, discontinued operation.",
        "label": "cohu_DisposalGroupIncludingDiscontinuedOperationImpairment",
        "terseLabel": "Disposal Group, Including Discontinued Operation, Impairment"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationImpairment",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_EmployeeSeveranceAndOtherExitCostsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents employee severance and other exit costs.",
        "label": "Employee Severance and Other Exit Costs [Member]"
       }
      }
     },
     "localname": "EmployeeSeveranceAndOtherExitCostsMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_EmployeeStockPurchasePlanMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Employee stock purchase plan.",
        "label": "Employee Stock Purchase Plan [Member]"
       }
      }
     },
     "localname": "EmployeeStockPurchasePlanMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_EquityBasedPerformanceStockUnitsGrantedIn202020192018And2017Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents equity based performance stock unites granted in 2020, 2019, 2018, and 2017.",
        "label": "Equity Based Performance Stock Units Granted in 2020, 2019, 2018, and 2017 [Member]"
       }
      }
     },
     "localname": "EquityBasedPerformanceStockUnitsGrantedIn202020192018And2017Member",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_EquityIncentivePlan2005Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information pertaining to the 2005 Equity Incentive Plan.",
        "label": "Equity Incentive Plan 2005 [Member]"
       }
      }
     },
     "localname": "EquityIncentivePlan2005Member",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_FacilityInPenangMalaysiaMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents Facility in Penang Malaysia.",
        "label": "Facility in Penang Malaysia [Member]"
       }
      }
     },
     "localname": "FacilityInPenangMalaysiaMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_FinanceLeaseLiabilityToBePaidAfterYearFour": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 0.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Thereafter, finance leases"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityToBePaidAfterYearFour",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_FirstFacilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the first facility.",
        "label": "First Facility [Member]"
       }
      }
     },
     "localname": "FirstFacilityMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_FixturesServicesBusinessFSGMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents information about Fixtures Services Business (\"FSG\").",
        "label": "Fixtures Services Business FSG [Member]"
       }
      }
     },
     "localname": "FixturesServicesBusinessFSGMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-tables"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_InProcessTechnologyMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents information pertaining to in-process technology.",
        "label": "In-process Technology [Member]"
       }
      }
     },
     "localname": "InProcessTechnologyMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_IncreaseDecreaseInAccruedCompensationWarrantyAndOtherLiabilities": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 17.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the period in accrued salaries, warranty, and other liabilities.",
        "label": "cohu_IncreaseDecreaseInAccruedCompensationWarrantyAndOtherLiabilities",
        "terseLabel": "Accrued compensation, warranty and other liabilities"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccruedCompensationWarrantyAndOtherLiabilities",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_IncreaseDecreaseInCurrentAndNoncurrentOperatingLeaseLiabilities": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 19.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in current and noncurrent operating lease liabilities.",
        "label": "Current and long-term operating lease liabilities"
       }
      }
     },
     "localname": "IncreaseDecreaseInCurrentAndNoncurrentOperatingLeaseLiabilities",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_IncreaseDecreaseInDeferredProfit": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 11.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of increase (decrease) in deferred profit during the period.",
        "label": "cohu_IncreaseDecreaseInDeferredProfit",
        "terseLabel": "Deferred profit"
       }
      }
     },
     "localname": "IncreaseDecreaseInDeferredProfit",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_IncreaseDecreaseInOperatingLeaseRightOfUseAssets": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 18.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in operating lease right-of-use assetS.",
        "label": "cohu_IncreaseDecreaseInOperatingLeaseRightOfUseAssets",
        "negatedLabel": "Operating lease right-of-use assets"
       }
      }
     },
     "localname": "IncreaseDecreaseInOperatingLeaseRightOfUseAssets",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_IndefiniteLivedInProcessResearchAndDevelopmentMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "In process investigation of new knowledge useful in developing new product or service or new process or technique or improvement to existing product or process, and translation of knowledge into plan or design for new product or process or for improvement to existing product or process classified as indefinite-lived.",
        "label": "Indefinite-lived In Process Research and Development [Member]"
       }
      }
     },
     "localname": "IndefiniteLivedInProcessResearchAndDevelopmentMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_IntegrationProgramMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Related to the Integration program",
        "label": "Integration Program [Member]"
       }
      }
     },
     "localname": "IntegrationProgramMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_InterestCapitalizedAssociatedWithCloudComputingImplementation": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 12.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest capitalized associated with cloud computing implementation.",
        "label": "cohu_InterestCapitalizedAssociatedWithCloudComputingImplementation",
        "negatedLabel": "Interest capitalized associated with cloud computing implementation"
       }
      }
     },
     "localname": "InterestCapitalizedAssociatedWithCloudComputingImplementation",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_InventoryCapitalizedAsPropertyPlantAndEquipment": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents information about inventory capitalized as property, plant and equipment.",
        "label": "Inventory capitalized as property, plant and equipment"
       }
      }
     },
     "localname": "InventoryCapitalizedAsPropertyPlantAndEquipment",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_IsmecaMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents information pertaining to Ismeca, a wholly-owned subsidiary of Cohu.",
        "label": "Ismeca [Member]"
       }
      }
     },
     "localname": "IsmecaMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_KitaTermLoansMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents information pertaining to term loans related to the Kita acquisition.",
        "label": "Kita Term Loans [Member]"
       }
      }
     },
     "localname": "KitaTermLoansMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_LeaseCashFlowInformationTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the cash flow information for leases.",
        "label": "Lease, Cash Flow Information [Table Text Block]"
       }
      }
     },
     "localname": "LeaseCashFlowInformationTableTextBlock",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "cohu_LeaseLiability": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from finance and operating lease.",
        "label": "cohu_LeaseLiability",
        "terseLabel": "Total lease liabilities",
        "verboseLabel": "Present value of lease liabilities, total"
       }
      }
     },
     "localname": "LeaseLiability",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LeaseLiabilityNoncurrent": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 8.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating and finance leases, classified as noncurrent.",
        "label": "Long-term lease liabilities"
       }
      }
     },
     "localname": "LeaseLiabilityNoncurrent",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LeaseRightofuseAsset": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's right to use underlying asset under finance and operating lease.",
        "label": "cohu_LeaseRightofuseAsset",
        "totalLabel": "Total lease assets"
       }
      }
     },
     "localname": "LeaseRightofuseAsset",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LeasesBalanceSheetInformationTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of balance sheet information for leases.",
        "label": "Leases, Balance Sheet Information [Table Text Block]"
       }
      }
     },
     "localname": "LeasesBalanceSheetInformationTableTextBlock",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "cohu_LesseeLeaseLiabilityMaturityTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of undiscounted cash flows of lessee's operating and finance lease liability.",
        "label": "Lessee, Lease, Liability, Maturity [Table Text Block]"
       }
      }
     },
     "localname": "LesseeLeaseLiabilityMaturityTableTextBlock",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "cohu_LesseeLeaseLiabilityPaymentsDue": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating and finance lease.",
        "label": "cohu_LesseeLeaseLiabilityPaymentsDue",
        "totalLabel": "Total lease payments, total"
       }
      }
     },
     "localname": "LesseeLeaseLiabilityPaymentsDue",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LesseeLeaseLiabilityPaymentsDueAfterYearFour": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 0.0,
       "parentTag": "cohu_LesseeLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating and finance lease, due after fourth fiscal year following latest fiscal year.",
        "label": "Thereafter, total"
       }
      }
     },
     "localname": "LesseeLeaseLiabilityPaymentsDueAfterYearFour",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LesseeLeaseLiabilityPaymentsDueNextTwelveMonths": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 2.0,
       "parentTag": "cohu_LesseeLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating and finance lease, due in next fiscal year following latest fiscal year.",
        "label": "2021, total"
       }
      }
     },
     "localname": "LesseeLeaseLiabilityPaymentsDueNextTwelveMonths",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LesseeLeaseLiabilityPaymentsDueYearFour": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 5.0,
       "parentTag": "cohu_LesseeLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating and finance lease, due in fourth fiscal year following latest fiscal year.",
        "label": "2024, total"
       }
      }
     },
     "localname": "LesseeLeaseLiabilityPaymentsDueYearFour",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LesseeLeaseLiabilityPaymentsDueYearThree": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 4.0,
       "parentTag": "cohu_LesseeLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating and finance lease, due in third fiscal year following latest fiscal year.",
        "label": "2023, total"
       }
      }
     },
     "localname": "LesseeLeaseLiabilityPaymentsDueYearThree",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LesseeLeaseLiabilityPaymentsDueYearTwo": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 3.0,
       "parentTag": "cohu_LesseeLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating and finance lease, due in second fiscal year following latest fiscal year.",
        "label": "2022, total"
       }
      }
     },
     "localname": "LesseeLeaseLiabilityPaymentsDueYearTwo",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LesseeLeaseLiabilityPaymentsRemainderOfFiscalYear": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 1.0,
       "parentTag": "cohu_LesseeLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating and finance lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.",
        "label": "2020, total"
       }
      }
     },
     "localname": "LesseeLeaseLiabilityPaymentsRemainderOfFiscalYear",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LesseeLeaseLiabilityUndiscountedExcessAmount": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating and finance lease.",
        "label": "cohu_LesseeLeaseLiabilityUndiscountedExcessAmount",
        "negatedLabel": "Less: Interest, total"
       }
      }
     },
     "localname": "LesseeLeaseLiabilityUndiscountedExcessAmount",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LesseeLeaseRemainingTermOfContract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Remaining term of lessee's operating and finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "cohu_LesseeLeaseRemainingTermOfContract",
        "terseLabel": "Lessee, Lease, Remaining Term of Contract (Year)"
       }
      }
     },
     "localname": "LesseeLeaseRemainingTermOfContract",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual"
     ],
     "xbrltype": "durationItemType"
    },
    "cohu_LesseeLeasesTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for operating and finance leases of lessee.",
        "label": "Lessee, Leases [Text Block]"
       }
      }
     },
     "localname": "LesseeLeasesTextBlock",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases"
     ],
     "xbrltype": "textBlockItemType"
    },
    "cohu_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 5.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Thereafter, operating leases"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityToBePaidAfterYearFour",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LesseeSubleaseIncomeReceivableYearTwo": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of sublease income receivable for the second fiscal year following the latest year.",
        "label": "cohu_LesseeSubleaseIncomeReceivableYearTwo",
        "terseLabel": "Lessee, Sublease Income, Receivable, Year Two"
       }
      }
     },
     "localname": "LesseeSubleaseIncomeReceivableYearTwo",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_LoanFacilitiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the loan facilities.",
        "label": "Loan Facilities [Member]"
       }
      }
     },
     "localname": "LoanFacilitiesMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_MachineryEquipmentAndSoftwareMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment and collection of computer programs and related data that provide instructions to a computer.",
        "label": "Machinery, Equipment and Software [Member]"
       }
      }
     },
     "localname": "MachineryEquipmentAndSoftwareMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_Malaysia1Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information about Malaysia.",
        "label": "Malaysia [Member]"
       }
      }
     },
     "localname": "Malaysia1Member",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_NetIncomeLossAttributableToNoncontrollingInterestPerBasicShare": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of net income (loss) attributable to noncontrolling interest per each share of common stock or unit outstanding during the reporting period.",
        "label": "cohu_NetIncomeLossAttributableToNoncontrollingInterestPerBasicShare",
        "negatedTerseLabel": "Net loss attributable to noncontrolling interest (in dollars per share)"
       }
      }
     },
     "localname": "NetIncomeLossAttributableToNoncontrollingInterestPerBasicShare",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "perShareItemType"
    },
    "cohu_NetIncomeLossAttributableToNoncontrollingInterestPerDilutedShare": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of net income (loss) attributable to the noncontrolling interest during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.",
        "label": "cohu_NetIncomeLossAttributableToNoncontrollingInterestPerDilutedShare",
        "negatedLabel": "Net loss attributable to noncontrolling interest (in dollars per share)"
       }
      }
     },
     "localname": "NetIncomeLossAttributableToNoncontrollingInterestPerDilutedShare",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "perShareItemType"
    },
    "cohu_NoncurrentOtherAccruedLiabilitiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents non-current other accrued liabilities.",
        "label": "Non-current Other Accrued Liabilities [Member]"
       }
      }
     },
     "localname": "NoncurrentOtherAccruedLiabilitiesMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_NonsystemsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of revenue derived from all other sources that are not systems.",
        "label": "Non-systems [Member]"
       }
      }
     },
     "localname": "NonsystemsMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_NoteToFinancialStatementDetailsTextual": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note To Financial Statement Details Textual"
       }
      }
     },
     "localname": "NoteToFinancialStatementDetailsTextual",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_NotesToFinancialStatementsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Notes To Financial Statements [Abstract]"
       }
      }
     },
     "localname": "NotesToFinancialStatementsAbstract",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_NumberOfAvailableLinesOfCredit": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the number of available lines of credit as of the balance sheet date.",
        "label": "cohu_NumberOfAvailableLinesOfCredit",
        "terseLabel": "Number of Available Lines of Credit"
       }
      }
     },
     "localname": "NumberOfAvailableLinesOfCredit",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "integerItemType"
    },
    "cohu_NumberOfMajorCustomers": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc.",
        "label": "Customers individually accounting for more than 10% of net sales"
       }
      }
     },
     "localname": "NumberOfMajorCustomers",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details"
     ],
     "xbrltype": "positiveIntegerItemType"
    },
    "cohu_OneCustomerMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information pertaining to one customer.",
        "label": "One Customer [Member]"
       }
      }
     },
     "localname": "OneCustomerMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_PCBTestMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Relating to the segment, PCB Test.",
        "label": "PCB Test [Member]"
       }
      }
     },
     "localname": "PCBTestMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_PercentageOfFairValueToDeterminePriceOfCommonStock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of the Fair Value to Determine the price of common stock.",
        "label": "cohu_PercentageOfFairValueToDeterminePriceOfCommonStock",
        "terseLabel": "Percentage of Fair Value to Determine Price of Common Stock"
       }
      }
     },
     "localname": "PercentageOfFairValueToDeterminePriceOfCommonStock",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "percentItemType"
    },
    "cohu_ProfitLossFromOperatingSegment": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of profit (loss) from operating segments.",
        "label": "Profit (loss) for reportable segments"
       }
      }
     },
     "localname": "ProfitLossFromOperatingSegment",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "cohu_RestOfTheWorldMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The rest of the world.",
        "label": "Rest of the World [Member]"
       }
      }
     },
     "localname": "RestOfTheWorldMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_ScheduleOfFinitelivedAndIndefinitelivedIntangibleAssetsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite or indefinite life, by either major class or business segment.",
        "label": "Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfFinitelivedAndIndefinitelivedIntangibleAssetsTableTextBlock",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "cohu_SecondFacilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the second facility.",
        "label": "Second Facility [Member]"
       }
      }
     },
     "localname": "SecondFacilityMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_SecuredTermLoanFacilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the information pertaining to the secured term loan facility.",
        "label": "Secured Term Loan Facility [Member]"
       }
      }
     },
     "localname": "SecuredTermLoanFacilityMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_SemiconductorTestAndInspectionAndPCBTestMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Relating to the segments, Semiconductor Test and Inspection and PCB Test.",
        "label": "Semiconductor Test and Inspection and PCB Test [Member]"
       }
      }
     },
     "localname": "SemiconductorTestAndInspectionAndPCBTestMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_SemiconductorTestAndInspectionMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Relating to the segment, Semiconductor Test &amp; Inspection.",
        "label": "Semiconductor Test and Inspection [Member]"
       }
      }
     },
     "localname": "SemiconductorTestAndInspectionMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesAvailableForIssue": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents share based compensation arrangement by share based payment award percentage of shares available for issue.",
        "label": "cohu_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesAvailableForIssue",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Available for Issue"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesAvailableForIssue",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "percentItemType"
    },
    "cohu_StandardProductWarrantyTerm": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Describes the term of the product warranty.",
        "label": "cohu_StandardProductWarrantyTerm",
        "terseLabel": "Standard Product Warranty Term (Month)"
       }
      }
     },
     "localname": "StandardProductWarrantyTerm",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual"
     ],
     "xbrltype": "durationItemType"
    },
    "cohu_SystemsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of revenue derived from systems.",
        "label": "Systems [Member]"
       }
      }
     },
     "localname": "SystemsMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_ThirdFacilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents third facility.",
        "label": "Third Facility [Member]"
       }
      }
     },
     "localname": "ThirdFacilityMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_VariableInterestEntityOwnershipPercentageSold": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The percentage of interest in a variable interest entity sold during the period.",
        "label": "cohu_VariableInterestEntityOwnershipPercentageSold",
        "terseLabel": "Variable Interest Entity, Ownership Percentage Sold"
       }
      }
     },
     "localname": "VariableInterestEntityOwnershipPercentageSold",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "percentItemType"
    },
    "cohu_VestOnTheThirdAnniversaryOfAwardsGrantMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represent awards that are versing on the third anniversary of grant.",
        "label": "Vest on the Third Anniversary of Awards Grant [Member]"
       }
      }
     },
     "localname": "VestOnTheThirdAnniversaryOfAwardsGrantMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_VestingOverFourYearPeriodMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represent four year vesting period.",
        "label": "Vesting Over Four Year Period [Member]"
       }
      }
     },
     "localname": "VestingOverFourYearPeriodMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_VestingOverOneYearPeriodMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represent a year vesting period.",
        "label": "Vesting Over One Year Period [Member]"
       }
      }
     },
     "localname": "VestingOverOneYearPeriodMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_XcerraMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Related to the entity Xcerra.",
        "label": "Xcerra [Member]"
       }
      }
     },
     "localname": "XcerraMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_XcerraTermLoanMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents information pertaining to a term loan related to the Xcerra acquisition.",
        "label": "Xcerra Term Loan [Member]"
       }
      }
     },
     "localname": "XcerraTermLoanMember",
     "nsuri": "http://www.cohu.com/20200627",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "cohu_statement-statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 1 - Summary of Significant Accounting Policies - Computation of Basic and Diluted Income (Loss) Per Share (Details)"
       }
      }
     },
     "localname": "statement-statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 1 - Summary of Significant Accounting Policies - Customer Concentration (Details)"
       }
      }
     },
     "localname": "statement-statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details)"
       }
      }
     },
     "localname": "statement-statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-1-summary-of-significant-accounting-policies-inventories-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 1 - Summary of Significant Accounting Policies - Inventories (Details)"
       }
      }
     },
     "localname": "statement-statement-note-1-summary-of-significant-accounting-policies-inventories-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)"
       }
      }
     },
     "localname": "statement-statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 1 - Summary of Significant Accounting Policies - Reported Share-based Compensation (Details)"
       }
      }
     },
     "localname": "statement-statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-1-summary-of-significant-accounting-policies-tables": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 1 - Summary of Significant Accounting Policies"
       }
      }
     },
     "localname": "statement-statement-note-1-summary-of-significant-accounting-policies-tables",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 10 - Discontinued Operations - Balance Sheet Information for Fixture Services Business (Details)"
       }
      }
     },
     "localname": "statement-statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-10-discontinued-operations-summary-of-operating-results-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 10 - Discontinued Operations - Summary of Operating Results (Details)"
       }
      }
     },
     "localname": "statement-statement-note-10-discontinued-operations-summary-of-operating-results-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-10-discontinued-operations-tables": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 10 - Discontinued Operations"
       }
      }
     },
     "localname": "statement-statement-note-10-discontinued-operations-tables",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-12-guarantees-changes-in-accrued-warranty-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 12 - Guarantees - Changes in Accrued Warranty (Details)"
       }
      }
     },
     "localname": "statement-statement-note-12-guarantees-changes-in-accrued-warranty-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-12-guarantees-tables": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 12 - Guarantees"
       }
      }
     },
     "localname": "statement-statement-note-12-guarantees-tables",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 2 - Goodwill and Purchased Intangible Assets - Changes in Carrying Value of Goodwill (Details)"
       }
      }
     },
     "localname": "statement-statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 2 - Goodwill and Purchased Intangible Assets - Purchased Intangible Assets (Details)"
       }
      }
     },
     "localname": "statement-statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-2-goodwill-and-purchased-intangible-assets-tables": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 2 - Goodwill and Purchased Intangible Assets"
       }
      }
     },
     "localname": "statement-statement-note-2-goodwill-and-purchased-intangible-assets-tables",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 3 - Borrowings and Credit Agreements - Summary of Borrowings (Details)"
       }
      }
     },
     "localname": "statement-statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-3-borrowings-and-credit-agreements-tables": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 3 - Borrowings and Credit Agreements"
       }
      }
     },
     "localname": "statement-statement-note-3-borrowings-and-credit-agreements-tables",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 4 - Restructuring Charges - Charges Related to the Wind Down Plan (Details)"
       }
      }
     },
     "localname": "statement-statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-4-restructuring-charges-tables": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 4 - Restructuring Charges"
       }
      }
     },
     "localname": "statement-statement-note-4-restructuring-charges-tables",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 5 - Financial Instruments Measured at Fair Value - Assets Measured at Fair Value on Recurring Basis (Details)"
       }
      }
     },
     "localname": "statement-statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 5 - Financial Instruments Measured at Fair Value - Effective Maturities of Short-term Investments (Details)"
       }
      }
     },
     "localname": "statement-statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 5 - Financial Instruments Measured at Fair Value - Short-term Investments by Security Type (Details)"
       }
      }
     },
     "localname": "statement-statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-5-financial-instruments-measured-at-fair-value-tables": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 5 - Financial Instruments Measured at Fair Value"
       }
      }
     },
     "localname": "statement-statement-note-5-financial-instruments-measured-at-fair-value-tables",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-8-segment-and-geographic-information-summary-of-current-segments-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 8 - Segment and Geographic Information - Summary of Current Segments (Details)"
       }
      }
     },
     "localname": "statement-statement-note-8-segment-and-geographic-information-summary-of-current-segments-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-8-segment-and-geographic-information-tables": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 8 - Segment and Geographic Information"
       }
      }
     },
     "localname": "statement-statement-note-8-segment-and-geographic-information-tables",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-9-leases-balance-sheet-information-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 9 - Leases - Balance Sheet Information (Details)"
       }
      }
     },
     "localname": "statement-statement-note-9-leases-balance-sheet-information-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-9-leases-cash-flow-information-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 9 - Leases - Cash Flow Information (Details)"
       }
      }
     },
     "localname": "statement-statement-note-9-leases-cash-flow-information-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-9-leases-future-minimum-lease-payments-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 9 - Leases - Future Minimum Lease Payments (Details)"
       }
      }
     },
     "localname": "statement-statement-note-9-leases-future-minimum-lease-payments-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-9-leases-lease-expense-details": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 9 - Leases - Lease Expense (Details)"
       }
      }
     },
     "localname": "statement-statement-note-9-leases-lease-expense-details",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-note-9-leases-tables": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Note 9 - Leases"
       }
      }
     },
     "localname": "statement-statement-note-9-leases-tables",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "cohu_statement-statement-significant-accounting-policies-policies": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Significant Accounting Policies"
       }
      }
     },
     "localname": "statement-statement-significant-accounting-policies-policies",
     "nsuri": "http://www.cohu.com/20200627",
     "xbrltype": "stringItemType"
    },
    "country_CN": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "CHINA"
       }
      }
     },
     "localname": "CN",
     "nsuri": "http://xbrl.sec.gov/country/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "domainItemType"
    },
    "country_PH": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "PHILIPPINES"
       }
      }
     },
     "localname": "PH",
     "nsuri": "http://xbrl.sec.gov/country/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "domainItemType"
    },
    "country_TW": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "TAIWAN, PROVINCE OF CHINA"
       }
      }
     },
     "localname": "TW",
     "nsuri": "http://xbrl.sec.gov/country/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "domainItemType"
    },
    "country_US": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "UNITED STATES"
       }
      }
     },
     "localname": "US",
     "nsuri": "http://xbrl.sec.gov/country/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "domainItemType"
    },
    "dei_AmendmentFlag": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.",
        "label": "Amendment Flag"
       }
      }
     },
     "localname": "AmendmentFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_CityAreaCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Area code of city",
        "label": "City Area Code"
       }
      }
     },
     "localname": "CityAreaCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_CurrentFiscalYearEndDate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "End date of current fiscal year in the format --MM-DD.",
        "label": "Current Fiscal Year End Date"
       }
      }
     },
     "localname": "CurrentFiscalYearEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "gMonthDayItemType"
    },
    "dei_DocumentFiscalPeriodFocus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fiscal period values are FY, Q1, Q2, and Q3.  1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.",
        "label": "Document Fiscal Period Focus"
       }
      }
     },
     "localname": "DocumentFiscalPeriodFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "fiscalPeriodItemType"
    },
    "dei_DocumentFiscalYearFocus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.",
        "label": "Document Fiscal Year Focus"
       }
      }
     },
     "localname": "DocumentFiscalYearFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "gYearItemType"
    },
    "dei_DocumentInformationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Document Information [Line Items]"
       }
      }
     },
     "localname": "DocumentInformationLineItems",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_DocumentInformationTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Container to support the formal attachment of each official or unofficial, public or private document as part of a submission package.",
        "label": "Document Information [Table]"
       }
      }
     },
     "localname": "DocumentInformationTable",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "dei_DocumentPeriodEndDate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.",
        "label": "Document Period End Date"
       }
      }
     },
     "localname": "DocumentPeriodEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "dateItemType"
    },
    "dei_DocumentQuarterlyReport": {
     "auth_ref": [
      "r589"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as an quarterly report.",
        "label": "Document Quarterly Report"
       }
      }
     },
     "localname": "DocumentQuarterlyReport",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentTransitionReport": {
     "auth_ref": [
      "r590"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as a transition report.",
        "label": "Document Transition Report"
       }
      }
     },
     "localname": "DocumentTransitionReport",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentType": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.",
        "label": "Document Type"
       }
      }
     },
     "localname": "DocumentType",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "submissionTypeItemType"
    },
    "dei_EntityAddressAddressLine1": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Address Line 1 such as Attn, Building Name, Street Name",
        "label": "Entity Address, Address Line One"
       }
      }
     },
     "localname": "EntityAddressAddressLine1",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressCityOrTown": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the City or Town",
        "label": "Entity Address, City or Town"
       }
      }
     },
     "localname": "EntityAddressCityOrTown",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressPostalZipCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Code for the postal or zip code",
        "label": "Entity Address, Postal Zip Code"
       }
      }
     },
     "localname": "EntityAddressPostalZipCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressStateOrProvince": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the state or province.",
        "label": "Entity Address, State or Province"
       }
      }
     },
     "localname": "EntityAddressStateOrProvince",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "stateOrProvinceItemType"
    },
    "dei_EntityCentralIndexKey": {
     "auth_ref": [
      "r591"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.",
        "label": "Entity Central Index Key"
       }
      }
     },
     "localname": "EntityCentralIndexKey",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "centralIndexKeyItemType"
    },
    "dei_EntityCommonStockSharesOutstanding": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.",
        "label": "Entity Common Stock, Shares Outstanding"
       }
      }
     },
     "localname": "EntityCommonStockSharesOutstanding",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "sharesItemType"
    },
    "dei_EntityCurrentReportingStatus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Current Reporting Status"
       }
      }
     },
     "localname": "EntityCurrentReportingStatus",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "All the names of the entities being reported upon in a document. Any legal structure used to conduct activities or to hold assets. Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts. This item does not include business and geographical segments which are included in the geographical or business segments domains.",
        "label": "Entity [Domain]"
       }
      }
     },
     "localname": "EntityDomain",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited-parentheticals",
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-tables",
      "http://www.cohu.com/20200627/role/statement-note-11-contingencies",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-changes-in-accrued-warranty-details",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-tables",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-tables",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-tables",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-tables",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-tables",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes",
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-tables",
      "http://www.cohu.com/20200627/role/statement-note-9-leases",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-cash-flow-information-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-tables",
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "domainItemType"
    },
    "dei_EntityEmergingGrowthCompany": {
     "auth_ref": [
      "r591"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate if registrant meets the emerging growth company criteria.",
        "label": "Entity Emerging Growth Company"
       }
      }
     },
     "localname": "EntityEmergingGrowthCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityFileNumber": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
        "label": "Entity File Number"
       }
      }
     },
     "localname": "EntityFileNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "fileNumberItemType"
    },
    "dei_EntityFilerCategory": {
     "auth_ref": [
      "r591"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Filer Category"
       }
      }
     },
     "localname": "EntityFilerCategory",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "filerCategoryItemType"
    },
    "dei_EntityIncorporationStateCountryCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Two-character EDGAR code representing the state or country of incorporation.",
        "label": "Entity Incorporation, State or Country Code"
       }
      }
     },
     "localname": "EntityIncorporationStateCountryCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "edgarStateCountryItemType"
    },
    "dei_EntityInteractiveDataCurrent": {
     "auth_ref": [
      "r592"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).",
        "label": "Entity Interactive Data Current"
       }
      }
     },
     "localname": "EntityInteractiveDataCurrent",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityRegistrantName": {
     "auth_ref": [
      "r591"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
        "label": "Entity Registrant Name"
       }
      }
     },
     "localname": "EntityRegistrantName",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityShellCompany": {
     "auth_ref": [
      "r591"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.",
        "label": "Entity Shell Company"
       }
      }
     },
     "localname": "EntityShellCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntitySmallBusiness": {
     "auth_ref": [
      "r591"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicates that the company is a Smaller Reporting Company (SRC).",
        "label": "Entity Small Business"
       }
      }
     },
     "localname": "EntitySmallBusiness",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityTaxIdentificationNumber": {
     "auth_ref": [
      "r591"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.",
        "label": "Entity Tax Identification Number"
       }
      }
     },
     "localname": "EntityTaxIdentificationNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "employerIdItemType"
    },
    "dei_LegalEntityAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The set of legal entities associated with a report.",
        "label": "Legal Entity [Axis]"
       }
      }
     },
     "localname": "LegalEntityAxis",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited-parentheticals",
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-tables",
      "http://www.cohu.com/20200627/role/statement-note-11-contingencies",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-changes-in-accrued-warranty-details",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-tables",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-tables",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-tables",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-tables",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-tables",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes",
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-tables",
      "http://www.cohu.com/20200627/role/statement-note-9-leases",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-cash-flow-information-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-tables",
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_LocalPhoneNumber": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Local phone number for entity.",
        "label": "Local Phone Number"
       }
      }
     },
     "localname": "LocalPhoneNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_Security12bTitle": {
     "auth_ref": [
      "r587"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Title of a 12(b) registered security.",
        "label": "Title of 12(b) Security"
       }
      }
     },
     "localname": "Security12bTitle",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "securityTitleItemType"
    },
    "dei_SecurityExchangeName": {
     "auth_ref": [
      "r588"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the Exchange on which a security is registered.",
        "label": "Security Exchange Name"
       }
      }
     },
     "localname": "SecurityExchangeName",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "edgarExchangeCodeItemType"
    },
    "dei_TradingSymbol": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Trading symbol of an instrument as listed on an exchange.",
        "label": "Trading Symbol"
       }
      }
     },
     "localname": "TradingSymbol",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-document-and-entity-information"
     ],
     "xbrltype": "tradingSymbolItemType"
    },
    "srt_ConsolidationItemsAxis": {
     "auth_ref": [
      "r184",
      "r203",
      "r204",
      "r205",
      "r206",
      "r208",
      "r210",
      "r214"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Consolidation Items [Axis]"
       }
      }
     },
     "localname": "ConsolidationItemsAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_ConsolidationItemsDomain": {
     "auth_ref": [
      "r184",
      "r203",
      "r204",
      "r205",
      "r206",
      "r208",
      "r210",
      "r214"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Consolidation Items [Domain]"
       }
      }
     },
     "localname": "ConsolidationItemsDomain",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember": {
     "auth_ref": [
      "r146",
      "r153",
      "r232",
      "r370",
      "r371",
      "r372",
      "r390",
      "r391"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Cumulative Effect, Period of Adoption, Adjustment [Member]"
       }
      }
     },
     "localname": "CumulativeEffectPeriodOfAdoptionAdjustmentMember",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_CumulativeEffectPeriodOfAdoptionAxis": {
     "auth_ref": [
      "r146",
      "r153",
      "r232",
      "r370",
      "r371",
      "r372",
      "r390",
      "r391"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Cumulative Effect, Period of Adoption [Axis]"
       }
      }
     },
     "localname": "CumulativeEffectPeriodOfAdoptionAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_CumulativeEffectPeriodOfAdoptionDomain": {
     "auth_ref": [
      "r146",
      "r153",
      "r232",
      "r370",
      "r371",
      "r372",
      "r390",
      "r391"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Cumulative Effect, Period of Adoption [Domain]"
       }
      }
     },
     "localname": "CumulativeEffectPeriodOfAdoptionDomain",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MajorCustomersAxis": {
     "auth_ref": [
      "r221",
      "r320",
      "r324",
      "r541"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Customer [Axis]"
       }
      }
     },
     "localname": "MajorCustomersAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_MaximumMember": {
     "auth_ref": [
      "r342",
      "r344",
      "r481",
      "r482",
      "r483",
      "r484",
      "r485",
      "r486",
      "r487",
      "r538",
      "r542"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Maximum [Member]"
       }
      }
     },
     "localname": "MaximumMember",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-9-leases",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MinimumMember": {
     "auth_ref": [
      "r342",
      "r344",
      "r481",
      "r482",
      "r483",
      "r484",
      "r485",
      "r486",
      "r487",
      "r538",
      "r542"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Minimum [Member]"
       }
      }
     },
     "localname": "MinimumMember",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-9-leases",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_NameOfMajorCustomerDomain": {
     "auth_ref": [
      "r221",
      "r320",
      "r324",
      "r541"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Customer [Domain]"
       }
      }
     },
     "localname": "NameOfMajorCustomerDomain",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_OwnershipAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Ownership [Axis]"
       }
      }
     },
     "localname": "OwnershipAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_OwnershipDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Ownership [Domain]"
       }
      }
     },
     "localname": "OwnershipDomain",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_ProductOrServiceAxis": {
     "auth_ref": [
      "r217",
      "r320",
      "r322",
      "r488",
      "r537",
      "r539"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Product and Service [Axis]"
       }
      }
     },
     "localname": "ProductOrServiceAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_ProductsAndServicesDomain": {
     "auth_ref": [
      "r217",
      "r320",
      "r322",
      "r488",
      "r537",
      "r539"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Product and Service [Domain]"
       }
      }
     },
     "localname": "ProductsAndServicesDomain",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_RangeAxis": {
     "auth_ref": [
      "r327",
      "r342",
      "r344",
      "r481",
      "r482",
      "r483",
      "r484",
      "r485",
      "r486",
      "r487",
      "r538",
      "r542"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statistical Measurement [Axis]"
       }
      }
     },
     "localname": "RangeAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-9-leases",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_RangeMember": {
     "auth_ref": [
      "r327",
      "r342",
      "r344",
      "r481",
      "r482",
      "r483",
      "r484",
      "r485",
      "r486",
      "r487",
      "r538",
      "r542"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statistical Measurement [Domain]"
       }
      }
     },
     "localname": "RangeMember",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-9-leases",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_SegmentGeographicalDomain": {
     "auth_ref": [
      "r218",
      "r219",
      "r320",
      "r323",
      "r540",
      "r575",
      "r576",
      "r577",
      "r578",
      "r579",
      "r580",
      "r581",
      "r582"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Geographical [Domain]"
       }
      }
     },
     "localname": "SegmentGeographicalDomain",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_StatementGeographicalAxis": {
     "auth_ref": [
      "r218",
      "r219",
      "r320",
      "r323",
      "r540",
      "r572",
      "r575",
      "r576",
      "r577",
      "r578",
      "r579",
      "r580",
      "r581",
      "r582",
      "r583"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Geographical [Axis]"
       }
      }
     },
     "localname": "StatementGeographicalAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountingPoliciesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Accounting Policies [Abstract]"
       }
      }
     },
     "localname": "AccountingPoliciesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountingStandardsUpdate201602Member": {
     "auth_ref": [
      "r457"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accounting Standards Update 2016-02 Leases (Topic 842).",
        "label": "Accounting Standards Update 2016-02 [Member]"
       }
      }
     },
     "localname": "AccountingStandardsUpdate201602Member",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccountsAndOtherReceivablesNetCurrent": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer.",
        "label": "Accounts receivable, net"
       }
      }
     },
     "localname": "AccountsAndOtherReceivablesNetCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccountsPayableCurrent": {
     "auth_ref": [
      "r68"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
        "label": "Accounts payable"
       }
      }
     },
     "localname": "AccountsPayableCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccruedIncomeTaxesCurrent": {
     "auth_ref": [
      "r44",
      "r497",
      "r520"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 9.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.",
        "label": "Income taxes payable"
       }
      }
     },
     "localname": "AccruedIncomeTaxesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccruedIncomeTaxesNoncurrent": {
     "auth_ref": [
      "r46",
      "r497",
      "r520"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.",
        "label": "Noncurrent income tax liabilities"
       }
      }
     },
     "localname": "AccruedIncomeTaxesNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment": {
     "auth_ref": [
      "r65",
      "r269"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details": {
       "order": 1.0,
       "parentTag": "us-gaap_PropertyPlantAndEquipmentNet",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.",
        "label": "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
        "negatedLabel": "Less accumulated depreciation and amortization"
       }
      }
     },
     "localname": "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": {
     "auth_ref": [
      "r51",
      "r86",
      "r87",
      "r88",
      "r523",
      "r550",
      "r554"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.",
        "label": "Accumulated other comprehensive loss",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss), Net of Tax, Total"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeMember": {
     "auth_ref": [
      "r85",
      "r88",
      "r89",
      "r143",
      "r144",
      "r145",
      "r420",
      "r545",
      "r546"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated increase (decrease) in equity from transactions and other events and circumstances from non-owner sources, attributable to the parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners.",
        "label": "AOCI Attributable to Parent [Member]"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdditionalPaidInCapitalCommonStock": {
     "auth_ref": [
      "r49"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.",
        "label": "Paid-in capital"
       }
      }
     },
     "localname": "AdditionalPaidInCapitalCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdditionalPaidInCapitalMember": {
     "auth_ref": [
      "r143",
      "r144",
      "r145",
      "r370",
      "r371",
      "r372"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.",
        "label": "Additional Paid-in Capital [Member]"
       }
      }
     },
     "localname": "AdditionalPaidInCapitalMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdjustmentsForNewAccountingPronouncementsAxis": {
     "auth_ref": [
      "r147",
      "r148",
      "r149",
      "r150",
      "r229",
      "r230",
      "r231",
      "r232",
      "r233",
      "r234",
      "r366",
      "r367",
      "r368",
      "r369",
      "r370",
      "r371",
      "r372",
      "r373",
      "r388",
      "r389",
      "r390",
      "r391",
      "r490",
      "r491",
      "r492",
      "r543",
      "r544",
      "r545",
      "r546",
      "r547",
      "r548",
      "r549",
      "r550",
      "r551",
      "r552",
      "r553",
      "r554"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by amendment to accounting standards.",
        "label": "Accounting Standards Update [Axis]"
       }
      }
     },
     "localname": "AdjustmentsForNewAccountingPronouncementsAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue": {
     "auth_ref": [
      "r345",
      "r347",
      "r375",
      "r376"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.",
        "label": "Share-based compensation expense"
       }
      }
     },
     "localname": "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Adjustments to reconcile net loss to net cash provided by (used in) operating activities:"
       }
      }
     },
     "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AllocatedShareBasedCompensationExpense": {
     "auth_ref": [
      "r347",
      "r363",
      "r374"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details": {
       "order": 0.0,
       "parentTag": "us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.",
        "label": "us-gaap_AllocatedShareBasedCompensationExpense",
        "terseLabel": "Allocated share-based compensation"
       }
      }
     },
     "localname": "AllocatedShareBasedCompensationExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after tax, of expense for award under share-based payment arrangement.",
        "label": "us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax",
        "totalLabel": "Total share-based compensation, net"
       }
      }
     },
     "localname": "AllocatedShareBasedCompensationExpenseNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AmortizationOfFinancingCosts": {
     "auth_ref": [
      "r108",
      "r127",
      "r455"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense attributable to debt issuance costs.",
        "label": "us-gaap_AmortizationOfFinancingCosts",
        "terseLabel": "Amortization of Debt Issuance Costs"
       }
      }
     },
     "localname": "AmortizationOfFinancingCosts",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AmortizationOfFinancingCostsAndDiscounts": {
     "auth_ref": [
      "r127",
      "r455"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 13.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.",
        "label": "Amortization of debt discounts and issuance costs"
       }
      }
     },
     "localname": "AmortizationOfFinancingCostsAndDiscounts",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AmortizationOfIntangibleAssets": {
     "auth_ref": [
      "r127",
      "r252",
      "r260"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_CostsAndExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.",
        "label": "Amortization of purchased intangible assets",
        "terseLabel": "Amortization of Intangible Assets, Total"
       }
      }
     },
     "localname": "AmortizationOfIntangibleAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount": {
     "auth_ref": [
      "r167"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.",
        "label": "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount",
        "terseLabel": "Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)"
       }
      }
     },
     "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_Assets": {
     "auth_ref": [
      "r138",
      "r192",
      "r205",
      "r212",
      "r228",
      "r414",
      "r421",
      "r439",
      "r495",
      "r518"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
        "label": "us-gaap_Assets",
        "terseLabel": "Assets, Total",
        "totalLabel": "Assets, Total"
       }
      }
     },
     "localname": "Assets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsCurrent": {
     "auth_ref": [
      "r32",
      "r34",
      "r82",
      "r138",
      "r228",
      "r414",
      "r421",
      "r439"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 6.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
        "label": "us-gaap_AssetsCurrent",
        "totalLabel": "Total current assets"
       }
      }
     },
     "localname": "AssetsCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsCurrentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Current assets:"
       }
      }
     },
     "localname": "AssetsCurrentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AssetsFairValueDisclosure": {
     "auth_ref": [
      "r429"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
        "label": "us-gaap_AssetsFairValueDisclosure",
        "terseLabel": "Assets, Fair Value Disclosure"
       }
      }
     },
     "localname": "AssetsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent": {
     "auth_ref": [
      "r265"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.",
        "label": "Assets held for sale"
       }
      }
     },
     "localname": "AssetsHeldForSaleNotPartOfDisposalGroupCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r22",
      "r26",
      "r272"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as assets attributable to disposal group held for sale or disposed of.",
        "label": "us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation",
        "terseLabel": "Total assets",
        "verboseLabel": "Discontinued operations"
       }
      }
     },
     "localname": "AssetsOfDisposalGroupIncludingDiscontinuedOperation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r22",
      "r26",
      "r267",
      "r272"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 6.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.",
        "label": "Current assets of discontinued operations (Note 10)",
        "terseLabel": "Total current assets"
       }
      }
     },
     "localname": "AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecurities": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.",
        "label": "us-gaap_AvailableForSaleSecurities",
        "terseLabel": "Short-term investments"
       }
      }
     },
     "localname": "AvailableForSaleSecurities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax": {
     "auth_ref": [
      "r224"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.",
        "label": "Gross Unrealized Gains"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.",
        "label": "Gross Unrealized Losses"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAmortizedCost": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.",
        "label": "Amortized Cost"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.",
        "label": "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
        "terseLabel": "Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesCurrent": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.",
        "label": "Short-term investments",
        "terseLabel": "Estimated Fair Value"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate": {
     "auth_ref": [
      "r225",
      "r227",
      "r514"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date.",
        "label": "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate",
        "totalLabel": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value, Total"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis": {
     "auth_ref": [
      "r225",
      "r227",
      "r512"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date.",
        "label": "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis",
        "totalLabel": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Total"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost": {
     "auth_ref": [
      "r226"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Due in one year or less, amortized cost"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue": {
     "auth_ref": [
      "r225",
      "r226",
      "r513"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Due in one year or less, fair value"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.",
        "label": "Available-for-sale Securities [Table Text Block]"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_AwardTypeAxis": {
     "auth_ref": [
      "r348",
      "r365"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of award under share-based payment arrangement.",
        "label": "Award Type [Axis]"
       }
      }
     },
     "localname": "AwardTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BalanceSheetLocationAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by location on balance sheet (statement of financial position).",
        "label": "Balance Sheet Location [Axis]"
       }
      }
     },
     "localname": "BalanceSheetLocationAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BalanceSheetLocationDomain": {
     "auth_ref": [
      "r427",
      "r428"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Location in the balance sheet (statement of financial position).",
        "label": "Balance Sheet Location [Domain]"
       }
      }
     },
     "localname": "BalanceSheetLocationDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_BasisOfAccountingPolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).",
        "label": "Basis of Accounting, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "BasisOfAccountingPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_BuildingAndBuildingImprovementsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Facility held for productive use including, but not limited to, office, production, storage and distribution facilities and any addition, improvement, or renovation to the structure, for example, but not limited to, interior masonry, interior flooring, electrical, and plumbing.",
        "label": "Building and Building Improvements [Member]"
       }
      }
     },
     "localname": "BuildingAndBuildingImprovementsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_BuildingImprovementsMember": {
     "auth_ref": [
      "r268"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Addition, improvement, or renovation to a facility held for productive use including, but not limited to, office, production, storage and distribution facilities.",
        "label": "Building Improvements [Member]"
       }
      }
     },
     "localname": "BuildingImprovementsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_BuildingMember": {
     "auth_ref": [
      "r268"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Facility held for productive use including, but not limited to, office, production, storage and distribution facilities.",
        "label": "Building [Member]"
       }
      }
     },
     "localname": "BuildingMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CapitalExpendituresIncurredButNotYetPaid": {
     "auth_ref": [
      "r131",
      "r132",
      "r133"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Future cash outflow to pay for purchases of fixed assets that have occurred.",
        "label": "Property, plant and equipment purchases included in accounts payable"
       }
      }
     },
     "localname": "CapitalExpendituresIncurredButNotYetPaid",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalizedComputerSoftwareAmortization1": {
     "auth_ref": [
      "r584",
      "r586"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense for amortization of capitalized computer software costs.",
        "label": "Amortization of cloud-based software implementation costs"
       }
      }
     },
     "localname": "CapitalizedComputerSoftwareAmortization1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashAndCashEquivalentsAtCarryingValue": {
     "auth_ref": [
      "r29",
      "r62",
      "r129"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 7.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.",
        "label": "Cash and cash equivalents"
       }
      }
     },
     "localname": "CashAndCashEquivalentsAtCarryingValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashAndCashEquivalentsAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of cash and cash equivalent balance.",
        "label": "Cash and Cash Equivalents [Axis]"
       }
      }
     },
     "localname": "CashAndCashEquivalentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CashAndCashEquivalentsFairValueDisclosure": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "us-gaap_CashAndCashEquivalentsFairValueDisclosure",
        "terseLabel": "Cash and cash equivalents"
       }
      }
     },
     "localname": "CashAndCashEquivalentsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": {
     "auth_ref": [
      "r123",
      "r129",
      "r134"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash and cash equivalents from continuing operations at end of period"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations": {
     "auth_ref": [
      "r123",
      "r129",
      "r134"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations",
        "periodEndLabel": "Cash and cash equivalents including discontinued operations at end of period",
        "periodStartLabel": "Cash and cash equivalents including discontinued operations at beginning of period"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect": {
     "auth_ref": [
      "r123",
      "r444"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
        "totalLabel": "Net increase (decrease) in cash and cash equivalents"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashMember": {
     "auth_ref": [
      "r40"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits.",
        "label": "Cash [Member]"
       }
      }
     },
     "localname": "CashMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations": {
     "auth_ref": [
      "r19",
      "r123"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) of investing activities of discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.",
        "label": "us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations",
        "totalLabel": "Net cash used in investing activities"
       }
      }
     },
     "localname": "CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock": {
     "auth_ref": [
      "r291",
      "r296",
      "r305"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for commitments, contingencies, and guarantees.",
        "label": "Commitments Contingencies and Guarantees [Text Block]"
       }
      }
     },
     "localname": "CommitmentsContingenciesAndGuaranteesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CommonStockDividendsPerShareDeclared": {
     "auth_ref": [
      "r315"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate dividends declared during the period for each share of common stock outstanding.",
        "label": "Cash dividend, per share (in dollars per share)",
        "verboseLabel": "Cash dividends declared per share (in dollars per share)"
       }
      }
     },
     "localname": "CommonStockDividendsPerShareDeclared",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited-parentheticals"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_CommonStockMember": {
     "auth_ref": [
      "r143",
      "r144"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Stock that is subordinate to all other stock of the issuer.",
        "label": "Common Stock [Member]"
       }
      }
     },
     "localname": "CommonStockMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommonStockParOrStatedValuePerShare": {
     "auth_ref": [
      "r48"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face amount or stated value per share of common stock.",
        "label": "Common stock, par value (in dollars per share)"
       }
      }
     },
     "localname": "CommonStockParOrStatedValuePerShare",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_CommonStockSharesAuthorized": {
     "auth_ref": [
      "r48"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum number of common shares permitted to be issued by an entity's charter and bylaws.",
        "label": "Common stock, shares authorized (in shares)"
       }
      }
     },
     "localname": "CommonStockSharesAuthorized",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockSharesIssued": {
     "auth_ref": [
      "r48"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.",
        "label": "Common stock, shares issued (in shares)"
       }
      }
     },
     "localname": "CommonStockSharesIssued",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockSharesOutstanding": {
     "auth_ref": [
      "r48",
      "r314"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.",
        "label": "Common stock, shares outstanding (in shares)"
       }
      }
     },
     "localname": "CommonStockSharesOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockValue": {
     "auth_ref": [
      "r48"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.",
        "label": "Common stock, $1 par value; 60,000 shares authorized, 41,862 shares issued and outstanding in 2020 and 41,395 shares in 2019"
       }
      }
     },
     "localname": "CommonStockValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomeNetOfTax": {
     "auth_ref": [
      "r92",
      "r94",
      "r95",
      "r106",
      "r508",
      "r534"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.",
        "label": "us-gaap_ComprehensiveIncomeNetOfTax",
        "totalLabel": "Comprehensive loss attributable to Cohu"
       }
      }
     },
     "localname": "ComprehensiveIncomeNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r92",
      "r94",
      "r105",
      "r412",
      "r413",
      "r425",
      "r507",
      "r533"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.",
        "label": "Comprehensive loss attributable to noncontrolling interest"
       }
      }
     },
     "localname": "ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r92",
      "r94",
      "r104",
      "r411",
      "r425",
      "r506",
      "r532"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.",
        "label": "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
        "totalLabel": "Comprehensive loss"
       }
      }
     },
     "localname": "ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomePolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for comprehensive income.",
        "label": "Comprehensive Income, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "ComprehensiveIncomePolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ConcentrationRiskBenchmarkDomain": {
     "auth_ref": [
      "r176",
      "r177",
      "r221",
      "r436",
      "r437"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The denominator in a calculation of a disclosed concentration risk percentage.",
        "label": "Concentration Risk Benchmark [Domain]"
       }
      }
     },
     "localname": "ConcentrationRiskBenchmarkDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ConcentrationRiskByBenchmarkAxis": {
     "auth_ref": [
      "r176",
      "r177",
      "r221",
      "r436",
      "r437",
      "r556"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by benchmark of concentration risk.",
        "label": "Concentration Risk Benchmark [Axis]"
       }
      }
     },
     "localname": "ConcentrationRiskByBenchmarkAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ConcentrationRiskByTypeAxis": {
     "auth_ref": [
      "r176",
      "r177",
      "r221",
      "r436",
      "r437",
      "r556"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of concentration risk, for example, but not limited to, asset, liability, net assets, geographic, customer, employees, supplier, lender.",
        "label": "Concentration Risk Type [Axis]"
       }
      }
     },
     "localname": "ConcentrationRiskByTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ConcentrationRiskCreditRisk": {
     "auth_ref": [
      "r173",
      "r516"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for credit risk.",
        "label": "Concentration Risk, Credit Risk, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "ConcentrationRiskCreditRisk",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ConcentrationRiskPercentage1": {
     "auth_ref": [
      "r176",
      "r177",
      "r221",
      "r436",
      "r437"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the \"benchmark\" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.",
        "label": "Percentage of net sales"
       }
      }
     },
     "localname": "ConcentrationRiskPercentage1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_ConcentrationRiskTypeDomain": {
     "auth_ref": [
      "r176",
      "r177",
      "r221",
      "r436",
      "r437"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For an entity that discloses a concentration risk as a percentage of some financial balance or benchmark, identifies the type (for example, asset, liability, net assets, geographic, customer, employees, supplier, lender) of the concentration.",
        "label": "Concentration Risk Type [Domain]"
       }
      }
     },
     "localname": "ConcentrationRiskTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ConstructionLoansMember": {
     "auth_ref": [
      "r572"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A borrowing arrangement which provides the entity constructing a facility (such as a building and a landfill) with funds to effect construction, generally on a draw down, or as needed, basis.",
        "label": "Construction Loans [Member]"
       }
      }
     },
     "localname": "ConstructionLoansMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ContractWithCustomerLiabilityCurrent": {
     "auth_ref": [
      "r316",
      "r317",
      "r321"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.",
        "label": "Customer advances"
       }
      }
     },
     "localname": "ContractWithCustomerLiabilityCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CorporateNonSegmentMember": {
     "auth_ref": [
      "r203",
      "r204",
      "r205",
      "r206",
      "r208",
      "r214",
      "r216"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Corporate headquarters or functional department that may not earn revenues or may earn revenues that are only incidental to the activities of the entity and is not considered an operating segment.",
        "label": "Corporate, Non-Segment [Member]"
       }
      }
     },
     "localname": "CorporateNonSegmentMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CostDepreciationAmortizationAndDepletion": {
     "auth_ref": [
      "r109"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense for allocation of cost of tangible and intangible assets over their useful lives, and reduction in quantity of natural resource due to consumption directly used in production of good and rendering of service.",
        "label": "Amortization of cost"
       }
      }
     },
     "localname": "CostDepreciationAmortizationAndDepletion",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited-parentheticals"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization": {
     "auth_ref": [
      "r100",
      "r101"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_CostsAndExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cost of product sold and service rendered, excluding depreciation, depletion, and amortization.",
        "label": "Cost of sales (1)"
       }
      }
     },
     "localname": "CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CostOfSalesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing cost of sales.",
        "label": "Cost of Sales [Member]"
       }
      }
     },
     "localname": "CostOfSalesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CostsAndExpenses": {
     "auth_ref": [
      "r110"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_OperatingIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total costs of sales and operating expenses for the period.",
        "label": "us-gaap_CostsAndExpenses",
        "totalLabel": "Costs and Expenses, Total"
       }
      }
     },
     "localname": "CostsAndExpenses",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CostsAndExpensesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Cost and expenses:"
       }
      }
     },
     "localname": "CostsAndExpensesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CostsAssociatedWithExitOrDisposalActivitiesOrRestructuringsPolicyTextBlock": {
     "auth_ref": [
      "r135",
      "r282",
      "r283",
      "r289"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for recognizing and reporting costs associated with exiting, disposing of, and restructuring certain operations.",
        "label": "Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "CostsAssociatedWithExitOrDisposalActivitiesOrRestructuringsPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CreditFacilityAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
        "label": "Credit Facility [Axis]"
       }
      }
     },
     "localname": "CreditFacilityAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CreditFacilityDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
        "label": "Credit Facility [Domain]"
       }
      }
     },
     "localname": "CreditFacilityDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CustomerConcentrationRiskMember": {
     "auth_ref": [
      "r175",
      "r221"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reflects the percentage that revenues in the period from one or more significant customers is to net revenues, as defined by the entity, such as total net revenues, product line revenues, segment revenues. The risk is the materially adverse effects of loss of a significant customer.",
        "label": "Customer Concentration Risk [Member]"
       }
      }
     },
     "localname": "CustomerConcentrationRiskMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CustomerRelationshipsMember": {
     "auth_ref": [
      "r406"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Customer relationship that exists between an entity and its customer, for example, but not limited to, tenant relationships.",
        "label": "Customer Relationships [Member]"
       }
      }
     },
     "localname": "CustomerRelationshipsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtDisclosureTextBlock": {
     "auth_ref": [
      "r312"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.",
        "label": "Debt Disclosure [Text Block]"
       }
      }
     },
     "localname": "DebtDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DebtInstrumentAxis": {
     "auth_ref": [
      "r43",
      "r44",
      "r45",
      "r496",
      "r499",
      "r517"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of debt instrument, including, but not limited to, draws against credit facilities.",
        "label": "Debt Instrument [Axis]"
       }
      }
     },
     "localname": "DebtInstrumentAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentBasisSpreadOnVariableRate1": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage points added to the reference rate to compute the variable rate on the debt instrument.",
        "label": "us-gaap_DebtInstrumentBasisSpreadOnVariableRate1",
        "terseLabel": "Debt Instrument, Basis Spread on Variable Rate"
       }
      }
     },
     "localname": "DebtInstrumentBasisSpreadOnVariableRate1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentCarryingAmount": {
     "auth_ref": [
      "r45",
      "r309",
      "r499",
      "r517"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.",
        "label": "Long term Debt"
       }
      }
     },
     "localname": "DebtInstrumentCarryingAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentCollateralAmount": {
     "auth_ref": [
      "r515"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of assets pledged to secure a debt instrument.",
        "label": "us-gaap_DebtInstrumentCollateralAmount",
        "terseLabel": "Debt Instrument, Collateral Amount"
       }
      }
     },
     "localname": "DebtInstrumentCollateralAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentFaceAmount": {
     "auth_ref": [
      "r454",
      "r456"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face (par) amount of debt instrument at time of issuance.",
        "label": "us-gaap_DebtInstrumentFaceAmount",
        "terseLabel": "Debt Instrument, Face Amount"
       }
      }
     },
     "localname": "DebtInstrumentFaceAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentInterestRateStatedPercentage": {
     "auth_ref": [
      "r74"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contractual interest rate for funds borrowed, under the debt agreement.",
        "label": "us-gaap_DebtInstrumentInterestRateStatedPercentage",
        "terseLabel": "Debt Instrument, Interest Rate, Stated Percentage"
       }
      }
     },
     "localname": "DebtInstrumentInterestRateStatedPercentage",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentNameDomain": {
     "auth_ref": [
      "r76"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The name for the particular debt instrument or borrowing that distinguishes it from other debt instruments or borrowings, including draws against credit facilities.",
        "label": "Debt Instrument, Name [Domain]"
       }
      }
     },
     "localname": "DebtInstrumentNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtInstrumentTerm": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "us-gaap_DebtInstrumentTerm",
        "terseLabel": "Debt Instrument, Term (Year)"
       }
      }
     },
     "localname": "DebtInstrumentTerm",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet": {
     "auth_ref": [
      "r310",
      "r455"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of unamortized debt discount (premium) and debt issuance costs.",
        "label": "us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet",
        "negatedLabel": "Less: financing fees and discount"
       }
      }
     },
     "localname": "DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount": {
     "auth_ref": [
      "r75"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.",
        "label": "us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount",
        "terseLabel": "Debt Instrument, Unused Borrowing Capacity, Amount"
       }
      }
     },
     "localname": "DebtInstrumentUnusedBorrowingCapacityAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtPolicyTextBlock": {
     "auth_ref": [
      "r135",
      "r307"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy related to debt. Includes, but is not limited to, debt issuance costs, the effects of refinancings, method of amortizing debt issuance costs and original issue discount, and classifications of debt.",
        "label": "Debt, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "DebtPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DeferredIncome": {
     "auth_ref": [
      "r306"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of deferred income excluding obligation to transfer product and service to customer for which consideration has been received or is receivable.",
        "label": "us-gaap_DeferredIncome",
        "terseLabel": "Deferred Income"
       }
      }
     },
     "localname": "DeferredIncome",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredIncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r127",
      "r139",
      "r387",
      "r394",
      "r395",
      "r396"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 7.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.",
        "label": "us-gaap_DeferredIncomeTaxExpenseBenefit",
        "terseLabel": "Deferred income taxes"
       }
      }
     },
     "localname": "DeferredIncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredIncomeTaxLiabilitiesNet": {
     "auth_ref": [
      "r379",
      "r380"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.",
        "label": "Deferred income taxes"
       }
      }
     },
     "localname": "DeferredIncomeTaxLiabilitiesNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DepreciationDepletionAndAmortization": {
     "auth_ref": [
      "r127",
      "r187"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.",
        "label": "us-gaap_DepreciationDepletionAndAmortization",
        "terseLabel": "Depreciation and amortization"
       }
      }
     },
     "localname": "DepreciationDepletionAndAmortization",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DevelopedTechnologyRightsMember": {
     "auth_ref": [
      "r407"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rights to developed technology, which can include the right to develop, use, market, sell, or offer for sale products, compounds, or intellectual property.",
        "label": "Developed Technology Rights [Member]"
       }
      }
     },
     "localname": "DevelopedTechnologyRightsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DisaggregationOfRevenueTableTextBlock": {
     "auth_ref": [
      "r320"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.",
        "label": "Disaggregation of Revenue [Table Text Block]"
       }
      }
     },
     "localname": "DisaggregationOfRevenueTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock": {
     "auth_ref": [
      "r377"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for share-based payment arrangement.",
        "label": "Share-based Payment Arrangement [Text Block]"
       }
      }
     },
     "localname": "DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DisclosureTextBlockAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "us-gaap_DisclosureTextBlockAbstract",
        "terseLabel": "Notes to Financial Statements"
       }
      }
     },
     "localname": "DisclosureTextBlockAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations",
      "http://www.cohu.com/20200627/role/statement-note-11-contingencies",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information",
      "http://www.cohu.com/20200627/role/statement-note-9-leases"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax": {
     "auth_ref": [
      "r5",
      "r7",
      "r9"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 20.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      },
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details": {
       "order": 1.0,
       "parentTag": "us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.",
        "label": "us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax",
        "negatedLabel": "Gain on disposal of discontinued operation",
        "terseLabel": "Gain on sale of Fixtures business"
       }
      }
     },
     "localname": "DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax": {
     "auth_ref": [
      "r5",
      "r6",
      "r7",
      "r8",
      "r9",
      "r17",
      "r99",
      "r529"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details": {
       "order": 0.0,
       "parentTag": "us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.",
        "label": "us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax",
        "totalLabel": "Income before taxes"
       }
      }
     },
     "localname": "DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation": {
     "auth_ref": [
      "r6",
      "r7",
      "r8",
      "r9",
      "r17",
      "r23",
      "r381",
      "r393",
      "r399"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details": {
       "order": 1.0,
       "parentTag": "us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.",
        "label": "us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation",
        "terseLabel": "Income tax provision"
       }
      }
     },
     "localname": "DiscontinuedOperationTaxEffectOfDiscontinuedOperation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DiscontinuedOperationsHeldforsaleMember": {
     "auth_ref": [
      "r3",
      "r4",
      "r22"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Component or group of components classified as held-for-sale and representing a strategic shift that has or will have a major effect on operations and financial results. Includes a business or nonprofit activity on acquisition classified as held-for-sale.",
        "label": "Discontinued Operations, Held-for-sale [Member]"
       }
      }
     },
     "localname": "DiscontinuedOperationsHeldforsaleMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DiscontinuedOperationsPolicyTextBlock": {
     "auth_ref": [
      "r11",
      "r27",
      "r135"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for discontinued operations. Includes, but is not limited to, method of interest allocation to a discontinued operation.",
        "label": "Discontinued Operations, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "DiscontinuedOperationsPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DisposalGroupClassificationAxis": {
     "auth_ref": [
      "r22"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by disposal group classification.",
        "label": "Disposal Group Classification [Axis]"
       }
      }
     },
     "localname": "DisposalGroupClassificationAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DisposalGroupClassificationDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Component or group of components disposed of, including but not limited to, disposal group held-for-sale or disposed of by sale, disposed of by means other than sale, and discontinued operations.",
        "label": "Disposal Group Classification [Domain]"
       }
      }
     },
     "localname": "DisposalGroupClassificationDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r272"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as accounts, notes and loans receivable attributable to disposal group held for sale or disposed of.",
        "label": "us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet",
        "terseLabel": "Accounts receivable, net"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r267",
      "r272"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details": {
       "order": 0.0,
       "parentTag": "us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as accrued liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.",
        "label": "us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent",
        "terseLabel": "Other accrued current liabilities"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r22",
      "r26",
      "r266",
      "r272"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.",
        "label": "Noncurrent assets of discontinued operations (Note 10)"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisposalGroupIncludingDiscontinuedOperationCash": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of currency on hand, demand deposits with banks or financial institutions, and  other kinds of accounts that have the general characteristics of demand deposits, held by a disposal group.",
        "label": "us-gaap_DisposalGroupIncludingDiscontinuedOperationCash",
        "negatedLabel": "Cash held by discontinued operations at end of period"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationCash",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r272"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as cash and cash equivalents attributable to disposal group held for sale or disposed of.",
        "label": "us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents",
        "terseLabel": "Cash and cash equivalents"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisposalGroupIncludingDiscontinuedOperationInventoryCurrent": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r267",
      "r272"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as inventory attributable to disposal group, expected to be disposed of within one year or the normal operating cycle, if longer.",
        "label": "us-gaap_DisposalGroupIncludingDiscontinuedOperationInventoryCurrent",
        "terseLabel": "Inventories"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationInventoryCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss": {
     "auth_ref": [
      "r18"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details": {
       "order": 0.0,
       "parentTag": "us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation.",
        "label": "us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss",
        "terseLabel": "Operating income before income taxes"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r267",
      "r272"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as other assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.",
        "label": "us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets",
        "terseLabel": "Other current assets"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r266",
      "r272"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as other assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.",
        "label": "us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets",
        "terseLabel": "Other noncurrent assets"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r266",
      "r272"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.",
        "label": "us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent",
        "terseLabel": "Property, plant and equipment, net"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue": {
     "auth_ref": [
      "r18",
      "r26"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.",
        "label": "us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue",
        "terseLabel": "Net sales"
       }
      }
     },
     "localname": "DisposalGroupIncludingDiscontinuedOperationRevenue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock": {
     "auth_ref": [
      "r28",
      "r276"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.",
        "label": "Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]"
       }
      }
     },
     "localname": "DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain": {
     "auth_ref": [
      "r340",
      "r343"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of disposal group.",
        "label": "Disposal Group Name [Domain]"
       }
      }
     },
     "localname": "DisposalGroupsIncludingDiscontinuedOperationsNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-tables"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DividendsCommonStockCash": {
     "auth_ref": [
      "r315"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.",
        "label": "us-gaap_DividendsCommonStockCash",
        "negatedLabel": "Cash dividends"
       }
      }
     },
     "localname": "DividendsCommonStockCash",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DividendsPayableCurrentAndNoncurrent": {
     "auth_ref": [
      "r44",
      "r46",
      "r498",
      "r519"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.",
        "label": "us-gaap_DividendsPayableCurrentAndNoncurrent",
        "terseLabel": "Dividends declared but not yet paid"
       }
      }
     },
     "localname": "DividendsPayableCurrentAndNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EarningsPerShareBasic": {
     "auth_ref": [
      "r107",
      "r151",
      "r152",
      "r153",
      "r154",
      "r155",
      "r159",
      "r161",
      "r164",
      "r165",
      "r166",
      "r169",
      "r170",
      "r509",
      "r535"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.",
        "label": "us-gaap_EarningsPerShareBasic",
        "terseLabel": "Net loss attributable to Cohu (in dollars per share)"
       }
      }
     },
     "localname": "EarningsPerShareBasic",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EarningsPerShareBasicAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Basic:"
       }
      }
     },
     "localname": "EarningsPerShareBasicAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EarningsPerShareDiluted": {
     "auth_ref": [
      "r107",
      "r151",
      "r152",
      "r153",
      "r154",
      "r155",
      "r161",
      "r164",
      "r165",
      "r166",
      "r169",
      "r170",
      "r509",
      "r535"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.",
        "label": "us-gaap_EarningsPerShareDiluted",
        "terseLabel": "Net loss attributable to Cohu (in dollars per share)"
       }
      }
     },
     "localname": "EarningsPerShareDiluted",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EarningsPerShareDilutedAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Diluted:"
       }
      }
     },
     "localname": "EarningsPerShareDilutedAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EarningsPerSharePolicyTextBlock": {
     "auth_ref": [
      "r135",
      "r167",
      "r168"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.",
        "label": "Earnings Per Share, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "EarningsPerSharePolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations": {
     "auth_ref": [
      "r444"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) from effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Effect of exchange rate changes on cash and cash equivalents"
       }
      }
     },
     "localname": "EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EffectiveIncomeTaxRateContinuingOperations": {
     "auth_ref": [
      "r382"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
        "label": "us-gaap_EffectiveIncomeTaxRateContinuingOperations",
        "terseLabel": "Effective Income Tax Rate Reconciliation, Percent, Total"
       }
      }
     },
     "localname": "EffectiveIncomeTaxRateContinuingOperations",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes-details-textual"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_EmployeeRelatedLiabilitiesCurrent": {
     "auth_ref": [
      "r72"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 6.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
        "label": "Accrued compensation and benefits"
       }
      }
     },
     "localname": "EmployeeRelatedLiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1": {
     "auth_ref": [
      "r364"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1",
        "terseLabel": "Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)"
       }
      }
     },
     "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense": {
     "auth_ref": [
      "r363"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details": {
       "order": 1.0,
       "parentTag": "us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of tax benefit for recognition of expense of award under share-based payment arrangement.",
        "label": "us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense",
        "negatedTerseLabel": "Income tax benefit"
       }
      }
     },
     "localname": "EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EmployeeSeveranceMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Termination of an employee associated with exit from or disposal of business activities or restructurings pursuant to a plan.",
        "label": "Employee Severance [Member]"
       }
      }
     },
     "localname": "EmployeeSeveranceMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EmployeeStockOptionMember": {
     "auth_ref": [
      "r361"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Share-based payment arrangement granting right, subject to vesting and other restrictions, to purchase or sell certain number of shares at predetermined price for specified period of time.",
        "label": "Share-based Payment Arrangement, Option [Member]"
       }
      }
     },
     "localname": "EmployeeStockOptionMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EquityComponentDomain": {
     "auth_ref": [
      "r143",
      "r144",
      "r145",
      "r148",
      "r156",
      "r158",
      "r172",
      "r232",
      "r314",
      "r315",
      "r370",
      "r371",
      "r372",
      "r390",
      "r391",
      "r445",
      "r446",
      "r447",
      "r448",
      "r449",
      "r451",
      "r545",
      "r546",
      "r547"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Components of equity are the parts of the total Equity balance including that which is allocated to common, preferred, treasury stock, retained earnings, etc.",
        "label": "Equity Component [Domain]"
       }
      }
     },
     "localname": "EquityComponentDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock": {
     "auth_ref": [
      "r429",
      "r430"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).",
        "label": "Fair Value, Assets Measured on Recurring Basis [Table Text Block]"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueByFairValueHierarchyLevelAxis": {
     "auth_ref": [
      "r328",
      "r329",
      "r330",
      "r331",
      "r332",
      "r333",
      "r334",
      "r336",
      "r430",
      "r478",
      "r479",
      "r480"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by level within fair value hierarchy and fair value measured at net asset value per share as practical expedient.",
        "label": "Fair Value Hierarchy and NAV [Axis]"
       }
      }
     },
     "localname": "FairValueByFairValueHierarchyLevelAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByMeasurementFrequencyAxis": {
     "auth_ref": [
      "r429",
      "r430",
      "r431",
      "r432",
      "r434"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by measurement frequency.",
        "label": "Measurement Frequency [Axis]"
       }
      }
     },
     "localname": "FairValueByMeasurementFrequencyAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueInputsLevel1Member": {
     "auth_ref": [
      "r328",
      "r329",
      "r334",
      "r336",
      "r430",
      "r478"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Quoted prices in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.",
        "label": "Fair Value, Inputs, Level 1 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel1Member",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel2Member": {
     "auth_ref": [
      "r328",
      "r329",
      "r334",
      "r336",
      "r430",
      "r479"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Inputs other than quoted prices included within level 1 that are observable for an asset or liability, either directly or indirectly, including, but not limited to, quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in inactive markets.",
        "label": "Fair Value, Inputs, Level 2 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel2Member",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel3Member": {
     "auth_ref": [
      "r328",
      "r329",
      "r330",
      "r331",
      "r332",
      "r333",
      "r334",
      "r336",
      "r430",
      "r480"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
        "label": "Fair Value, Inputs, Level 3 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel3Member",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementFrequencyDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measurement frequency.",
        "label": "Measurement Frequency [Domain]"
       }
      }
     },
     "localname": "FairValueMeasurementFrequencyDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementInputsDisclosureTextBlock": {
     "auth_ref": [
      "r435"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis.",
        "label": "Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block]"
       }
      }
     },
     "localname": "FairValueMeasurementInputsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": {
     "auth_ref": [
      "r328",
      "r329",
      "r330",
      "r331",
      "r332",
      "r333",
      "r334",
      "r336",
      "r478",
      "r479",
      "r480"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Categories used to prioritize the inputs to valuation techniques to measure fair value.",
        "label": "Fair Value Hierarchy and NAV [Domain]"
       }
      }
     },
     "localname": "FairValueMeasurementsFairValueHierarchyDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementsRecurringMember": {
     "auth_ref": [
      "r433",
      "r434"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Frequent fair value measurement. Includes, but is not limited to, fair value adjustment for impairment of asset, liability or equity, frequently measured at fair value.",
        "label": "Fair Value, Recurring [Member]"
       }
      }
     },
     "localname": "FairValueMeasurementsRecurringMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinanceLeaseInterestExpense": {
     "auth_ref": [
      "r460",
      "r466",
      "r477"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details": {
       "order": 2.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest expense on finance lease liability.",
        "label": "Interest on lease liabilities"
       }
      }
     },
     "localname": "FinanceLeaseInterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseInterestPaymentOnLiability": {
     "auth_ref": [
      "r462",
      "r471"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest paid on finance lease liability.",
        "label": "Operating cash flows from finance leases"
       }
      }
     },
     "localname": "FinanceLeaseInterestPaymentOnLiability",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-cash-flow-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiability": {
     "auth_ref": [
      "r459",
      "r476"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease.",
        "label": "Present value of lease liabilities, finance leases"
       }
      }
     },
     "localname": "FinanceLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityCurrent": {
     "auth_ref": [
      "r459"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.",
        "label": "us-gaap_FinanceLeaseLiabilityCurrent",
        "terseLabel": "Finance, current"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityNoncurrent": {
     "auth_ref": [
      "r459"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.",
        "label": "us-gaap_FinanceLeaseLiabilityNoncurrent",
        "terseLabel": "Finance, noncurrent"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDue": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease.",
        "label": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
        "totalLabel": "Total lease payments, finance leases"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 2.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "2021, finance leases"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueNextTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 5.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "2024, finance leases"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueYearFour",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 4.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "2023, finance leases"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueYearThree",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 3.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "2022, finance leases"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 1.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in remainder of current fiscal year.",
        "label": "2020, finance leases"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount": {
     "auth_ref": [
      "r476"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.",
        "label": "us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount",
        "negatedLabel": "Less: Interest, finance leases"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityUndiscountedExcessAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeasePrincipalPayments": {
     "auth_ref": [
      "r461",
      "r471"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for principal payment on finance lease.",
        "label": "Financing cash flows from finance leases"
       }
      }
     },
     "localname": "FinanceLeasePrincipalPayments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-cash-flow-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseRightOfUseAsset": {
     "auth_ref": [
      "r458"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details": {
       "order": 1.0,
       "parentTag": "cohu_LeaseRightofuseAsset",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after accumulated amortization, of right-of-use asset from finance lease.",
        "label": "us-gaap_FinanceLeaseRightOfUseAsset",
        "terseLabel": "Finance lease assets"
       }
      }
     },
     "localname": "FinanceLeaseRightOfUseAsset",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization": {
     "auth_ref": [
      "r460",
      "r466"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated amortization of right-of-use asset from finance lease.",
        "label": "us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization",
        "terseLabel": "Finance Lease, Right-of-Use Asset, Accumulated Amortization"
       }
      }
     },
     "localname": "FinanceLeaseRightOfUseAssetAccumulatedAmortization",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseRightOfUseAssetAmortization": {
     "auth_ref": [
      "r460",
      "r466",
      "r477"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details": {
       "order": 0.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense attributable to right-of-use asset from finance lease.",
        "label": "Amortization of leased assets"
       }
      }
     },
     "localname": "FinanceLeaseRightOfUseAssetAmortization",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent": {
     "auth_ref": [
      "r474",
      "r477"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average discount rate for finance lease calculated at point in time.",
        "label": "us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent",
        "terseLabel": "Finance leases"
       }
      }
     },
     "localname": "FinanceLeaseWeightedAverageDiscountRatePercent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1": {
     "auth_ref": [
      "r473",
      "r477"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1",
        "terseLabel": "Finance leases (Year)"
       }
      }
     },
     "localname": "FinanceLeaseWeightedAverageRemainingLeaseTerm1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetUsefulLife": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "Remaining Useful Life (Year)"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetUsefulLife",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization": {
     "auth_ref": [
      "r259"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
        "label": "Accumulated Amortization"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAccumulatedAmortization",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis": {
     "auth_ref": [
      "r253",
      "r255",
      "r259",
      "r262",
      "r489",
      "r493"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by major type or class of finite-lived intangible assets.",
        "label": "Finite-Lived Intangible Assets by Major Class [Axis]"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsByMajorClassAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsGross": {
     "auth_ref": [
      "r259",
      "r493"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
        "label": "Gross Carrying Amount, finite-lived intangible assets"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsGross",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain": {
     "auth_ref": [
      "r253",
      "r258"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The major class of finite-lived intangible asset (for example, patents, trademarks, copyrights, etc.) A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.",
        "label": "Finite-Lived Intangible Assets, Major Class Name [Domain]"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsMajorClassNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ForeignCurrencyTransactionGainLossBeforeTax": {
     "auth_ref": [
      "r440",
      "r441",
      "r442",
      "r443"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.",
        "label": "Foreign transaction loss"
       }
      }
     },
     "localname": "ForeignCurrencyTransactionGainLossBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ForeignCurrencyTransactionGainLossRealized": {
     "auth_ref": [
      "r442",
      "r443"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.",
        "label": "us-gaap_ForeignCurrencyTransactionGainLossRealized",
        "terseLabel": "Foreign Currency Transaction Gain (Loss), Realized"
       }
      }
     },
     "localname": "ForeignCurrencyTransactionGainLossRealized",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock": {
     "auth_ref": [
      "r135",
      "r452"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for (1) transactions denominated in a currency other than the reporting enterprise's functional currency, (2) translating foreign currency financial statements that are incorporated into the financial statements of the reporting enterprise by consolidation, combination, or the equity method of accounting, and (3) remeasurement of the financial statements of a foreign reporting enterprise in a hyperinflationary economy.",
        "label": "Foreign Currency Transactions and Translations Policy [Policy Text Block]"
       }
      }
     },
     "localname": "ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ForeignGovernmentDebtSecuritiesMember": {
     "auth_ref": [
      "r328",
      "r555"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt security issued by government not domiciled in United States of America (US).",
        "label": "Debt Security, Government, Non-US [Member]"
       }
      }
     },
     "localname": "ForeignGovernmentDebtSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_GainLossOnDispositionOfAssets1": {
     "auth_ref": [
      "r127"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 22.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.",
        "label": "us-gaap_GainLossOnDispositionOfAssets1",
        "negatedLabel": "Loss on disposal of assets"
       }
      }
     },
     "localname": "GainLossOnDispositionOfAssets1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GainLossOnSaleOfPropertyPlantEquipment": {
     "auth_ref": [
      "r127"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.",
        "label": "us-gaap_GainLossOnSaleOfPropertyPlantEquipment",
        "terseLabel": "Gain (Loss) on Disposition of Property Plant Equipment, Total"
       }
      }
     },
     "localname": "GainLossOnSaleOfPropertyPlantEquipment",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GeneralAndAdministrativeExpense": {
     "auth_ref": [
      "r112"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.",
        "label": "us-gaap_GeneralAndAdministrativeExpense",
        "negatedLabel": "Corporate expenses"
       }
      }
     },
     "localname": "GeneralAndAdministrativeExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Goodwill": {
     "auth_ref": [
      "r241",
      "r243",
      "r494"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.",
        "label": "Goodwill",
        "periodEndLabel": "Ending balance",
        "periodStartLabel": "Beginning balance"
       }
      }
     },
     "localname": "Goodwill",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GoodwillAndIntangibleAssetImpairment": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.",
        "label": "us-gaap_GoodwillAndIntangibleAssetImpairment",
        "terseLabel": "Goodwill and Intangible Asset Impairment, Total"
       }
      }
     },
     "localname": "GoodwillAndIntangibleAssetImpairment",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock": {
     "auth_ref": [
      "r264"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for goodwill and intangible assets.",
        "label": "Goodwill and Intangible Assets Disclosure [Text Block]"
       }
      }
     },
     "localname": "GoodwillAndIntangibleAssetsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock": {
     "auth_ref": [
      "r135",
      "r247",
      "r256"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for goodwill and intangible assets. This accounting policy also may address how an entity assesses and measures impairment of goodwill and intangible assets.",
        "label": "Goodwill and Intangible Assets, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "GoodwillAndIntangibleAssetsPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_GoodwillForeignCurrencyTranslationGainLoss": {
     "auth_ref": [
      "r245"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.",
        "label": "us-gaap_GoodwillForeignCurrencyTranslationGainLoss",
        "verboseLabel": "Impact of currency exchange"
       }
      }
     },
     "localname": "GoodwillForeignCurrencyTranslationGainLoss",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GoodwillImpairmentLoss": {
     "auth_ref": [
      "r127",
      "r242",
      "r244",
      "r249"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.",
        "label": "us-gaap_GoodwillImpairmentLoss",
        "negatedLabel": "Impairments"
       }
      }
     },
     "localname": "GoodwillImpairmentLoss",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GoodwillPurchaseAccountingAdjustments": {
     "auth_ref": [
      "r246",
      "r403"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.",
        "label": "us-gaap_GoodwillPurchaseAccountingAdjustments",
        "verboseLabel": "Adjustments"
       }
      }
     },
     "localname": "GoodwillPurchaseAccountingAdjustments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill": {
     "auth_ref": [
      "r127",
      "r263"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 21.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_CostsAndExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.",
        "label": "Impairment charges",
        "terseLabel": "Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)"
       }
      }
     },
     "localname": "ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeLossFromContinuingOperations": {
     "auth_ref": [
      "r111",
      "r128",
      "r151",
      "r152",
      "r153",
      "r154",
      "r163",
      "r166",
      "r410"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_ProfitLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of income (loss) from continuing operations attributable to the parent.",
        "label": "us-gaap_IncomeLossFromContinuingOperations",
        "totalLabel": "Loss from continuing operations"
       }
      }
     },
     "localname": "IncomeLossFromContinuingOperations",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments": {
     "auth_ref": [
      "r140",
      "r192",
      "r204",
      "r208",
      "r211",
      "r214"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperations",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.",
        "label": "Loss from continuing operations before taxes",
        "totalLabel": "Loss from continuing operations before taxes"
       }
      }
     },
     "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeLossFromContinuingOperationsPerBasicShare": {
     "auth_ref": [
      "r97",
      "r107",
      "r147",
      "r151",
      "r152",
      "r153",
      "r154",
      "r161",
      "r164",
      "r165",
      "r502",
      "r503",
      "r509",
      "r528"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.",
        "label": "Loss from continuing operations before noncontrolling interest (in dollars per share)"
       }
      }
     },
     "localname": "IncomeLossFromContinuingOperationsPerBasicShare",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare": {
     "auth_ref": [
      "r97",
      "r107",
      "r147",
      "r151",
      "r152",
      "r153",
      "r154",
      "r161",
      "r164",
      "r165",
      "r166",
      "r509",
      "r528",
      "r531",
      "r535"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.",
        "label": "us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare",
        "terseLabel": "Loss from continuing operations before noncontrolling interest (in dollars per share)"
       }
      }
     },
     "localname": "IncomeLossFromContinuingOperationsPerDilutedShare",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity": {
     "auth_ref": [
      "r5",
      "r6",
      "r7",
      "r8",
      "r9",
      "r17",
      "r23",
      "r411"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_ProfitLoss",
       "weight": 1.0
      },
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.",
        "label": "Income from discontinued operations",
        "totalLabel": "Income, net of tax"
       }
      }
     },
     "localname": "IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare": {
     "auth_ref": [
      "r99",
      "r107",
      "r162",
      "r164",
      "r165",
      "r509",
      "r529",
      "r531",
      "r535"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.",
        "label": "Income from discontinued operations (in dollars per share)"
       }
      }
     },
     "localname": "IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare": {
     "auth_ref": [
      "r162",
      "r164",
      "r165",
      "r426"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.",
        "label": "us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare",
        "terseLabel": "Income from discontinued operations (in dollars per share)"
       }
      }
     },
     "localname": "IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_IncomeStatementAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Income Statement [Abstract]"
       }
      }
     },
     "localname": "IncomeStatementAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis": {
     "auth_ref": [
      "r340",
      "r343"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by name of disposal group.",
        "label": "Disposal Group Name [Axis]"
       }
      }
     },
     "localname": "IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-tables"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeStatementLocationAxis": {
     "auth_ref": [
      "r271"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by location in the income statement.",
        "label": "Income Statement Location [Axis]"
       }
      }
     },
     "localname": "IncomeStatementLocationAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeStatementLocationDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Location in the income statement.",
        "label": "Income Statement Location [Domain]"
       }
      }
     },
     "localname": "IncomeStatementLocationDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_IncomeTaxDisclosureTextBlock": {
     "auth_ref": [
      "r383",
      "r385",
      "r386",
      "r392",
      "r397",
      "r400",
      "r401",
      "r402"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.",
        "label": "Income Tax Disclosure [Text Block]"
       }
      }
     },
     "localname": "IncomeTaxDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_IncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r139",
      "r157",
      "r158",
      "r190",
      "r381",
      "r393",
      "r398",
      "r536"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperations",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
        "label": "Income tax provision (benefit)"
       }
      }
     },
     "localname": "IncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeTaxesPaidNet": {
     "auth_ref": [
      "r130"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.",
        "label": "Cash paid for income taxes"
       }
      }
     },
     "localname": "IncomeTaxesPaidNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccountsPayable": {
     "auth_ref": [
      "r126"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 10.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.",
        "label": "us-gaap_IncreaseDecreaseInAccountsPayable",
        "terseLabel": "Accounts payable"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccountsPayable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccountsReceivable": {
     "auth_ref": [
      "r126"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 15.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.",
        "label": "us-gaap_IncreaseDecreaseInAccountsReceivable",
        "negatedTerseLabel": "Accounts receivable"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccountsReceivable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable": {
     "auth_ref": [
      "r126"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 16.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.",
        "label": "us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable",
        "terseLabel": "Income taxes payable"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccruedIncomeTaxesPayable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInContractWithCustomerLiability": {
     "auth_ref": [
      "r126"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 14.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.",
        "label": "us-gaap_IncreaseDecreaseInContractWithCustomerLiability",
        "terseLabel": "Customer advances"
       }
      }
     },
     "localname": "IncreaseDecreaseInContractWithCustomerLiability",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInInventories": {
     "auth_ref": [
      "r126"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 8.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.",
        "label": "us-gaap_IncreaseDecreaseInInventories",
        "negatedTerseLabel": "Inventories"
       }
      }
     },
     "localname": "IncreaseDecreaseInInventories",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Changes in current assets and liabilities:"
       }
      }
     },
     "localname": "IncreaseDecreaseInOperatingCapitalAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncreaseDecreaseInOtherAccruedLiabilities": {
     "auth_ref": [
      "r126"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in other expenses incurred but not yet paid.",
        "label": "Changes in other accrued liabilities"
       }
      }
     },
     "localname": "IncreaseDecreaseInOtherAccruedLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInOtherCurrentAssets": {
     "auth_ref": [
      "r126"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 9.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in current assets classified as other.",
        "label": "us-gaap_IncreaseDecreaseInOtherCurrentAssets",
        "negatedTerseLabel": "Other current assets"
       }
      }
     },
     "localname": "IncreaseDecreaseInOtherCurrentAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInOtherNoncurrentAssets": {
     "auth_ref": [
      "r126"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in noncurrent assets classified as other.",
        "label": "us-gaap_IncreaseDecreaseInOtherNoncurrentAssets",
        "negatedLabel": "Changes in other assets"
       }
      }
     },
     "localname": "IncreaseDecreaseInOtherNoncurrentAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis": {
     "auth_ref": [
      "r254",
      "r261"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type or class of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.",
        "label": "Indefinite-lived Intangible Assets [Axis]"
       }
      }
     },
     "localname": "IndefiniteLivedIntangibleAssetsByMajorClassAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill": {
     "auth_ref": [
      "r261"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.",
        "label": "us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill",
        "terseLabel": "Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance"
       }
      }
     },
     "localname": "IndefiniteLivedIntangibleAssetsExcludingGoodwill",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain": {
     "auth_ref": [
      "r254",
      "r261"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The major class of indefinite-lived intangible asset (for example, trade names, etc. but not all-inclusive), excluding goodwill. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of the company.",
        "label": "Indefinite-lived Intangible Assets, Major Class Name [Domain]"
       }
      }
     },
     "localname": "IndefiniteLivedIntangibleAssetsMajorClassNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_IntangibleAssetsNetExcludingGoodwill": {
     "auth_ref": [
      "r251",
      "r257"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.",
        "label": "Intangible assets, net"
       }
      }
     },
     "localname": "IntangibleAssetsNetExcludingGoodwill",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpense": {
     "auth_ref": [
      "r98",
      "r186",
      "r453",
      "r455",
      "r510"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of the cost of borrowed funds accounted for as interest expense.",
        "label": "us-gaap_InterestExpense",
        "negatedLabel": "Interest expense"
       }
      }
     },
     "localname": "InterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestPaidNet": {
     "auth_ref": [
      "r120",
      "r124",
      "r130"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.",
        "label": "Cash paid for interest"
       }
      }
     },
     "localname": "InterestPaidNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InventoryFinishedGoodsNetOfReserves": {
     "auth_ref": [
      "r55",
      "r237"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details": {
       "order": 2.0,
       "parentTag": "us-gaap_InventoryNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.",
        "label": "Finished goods"
       }
      }
     },
     "localname": "InventoryFinishedGoodsNetOfReserves",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InventoryNet": {
     "auth_ref": [
      "r30",
      "r79"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      },
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.",
        "label": "Inventories",
        "totalLabel": "Total inventories"
       }
      }
     },
     "localname": "InventoryNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InventoryPolicyTextBlock": {
     "auth_ref": [
      "r39",
      "r80",
      "r135",
      "r171",
      "r235",
      "r236",
      "r238"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost.",
        "label": "Inventory, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "InventoryPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves": {
     "auth_ref": [
      "r57",
      "r58",
      "r237"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details": {
       "order": 0.0,
       "parentTag": "us-gaap_InventoryNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. This amount is net of valuation reserves and adjustments.",
        "label": "Raw materials and purchased parts"
       }
      }
     },
     "localname": "InventoryRawMaterialsAndSuppliesNetOfReserves",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InventoryWorkInProcessNetOfReserves": {
     "auth_ref": [
      "r56",
      "r237"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details": {
       "order": 1.0,
       "parentTag": "us-gaap_InventoryNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.",
        "label": "Work in process"
       }
      }
     },
     "localname": "InventoryWorkInProcessNetOfReserves",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentIncomeInterestAndDividend": {
     "auth_ref": [
      "r113"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.",
        "label": "Interest income"
       }
      }
     },
     "localname": "InvestmentIncomeInterestAndDividend",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentTypeAxis": {
     "auth_ref": [
      "r557",
      "r558",
      "r559",
      "r560",
      "r561",
      "r562",
      "r563",
      "r564",
      "r565",
      "r566",
      "r567",
      "r568",
      "r569",
      "r570",
      "r571"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of investments.",
        "label": "Investment Type [Axis]"
       }
      }
     },
     "localname": "InvestmentTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InvestmentTypeCategorizationMember": {
     "auth_ref": [
      "r557",
      "r558",
      "r559",
      "r560",
      "r561",
      "r562",
      "r563",
      "r564",
      "r565",
      "r566",
      "r567",
      "r568",
      "r569",
      "r570",
      "r571"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Asset obtained to generate income or appreciate in value.",
        "label": "Investments [Domain]"
       }
      }
     },
     "localname": "InvestmentTypeCategorizationMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.",
        "label": "Investments Classified by Contractual Maturity Date [Table Text Block]"
       }
      }
     },
     "localname": "InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LandAndLandImprovementsMember": {
     "auth_ref": [
      "r35"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Real estate held and assets that are an addition or improvement to real estate held.",
        "label": "Land and Land Improvements [Member]"
       }
      }
     },
     "localname": "LandAndLandImprovementsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LeaseCost": {
     "auth_ref": [
      "r475",
      "r477"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lease cost recognized by lessee for lease contract.",
        "label": "us-gaap_LeaseCost",
        "totalLabel": "Net lease cost"
       }
      }
     },
     "localname": "LeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LeaseCostTableTextBlock": {
     "auth_ref": [
      "r475"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.",
        "label": "Lease, Cost [Table Text Block]"
       }
      }
     },
     "localname": "LeaseCostTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LesseeLeasesPolicyTextBlock": {
     "auth_ref": [
      "r464"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for leasing arrangement entered into by lessee.",
        "label": "Lessee, Leases [Policy Text Block]"
       }
      }
     },
     "localname": "LesseeLeasesPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease.",
        "label": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
        "totalLabel": "Total lease payments, operating leases"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 1.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "2021, operating leases"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 4.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "2024, operating leases"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFour",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 3.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "2023, operating leases"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearThree",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 2.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "2022, operating leases"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear": {
     "auth_ref": [
      "r476"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details": {
       "order": 0.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal year.",
        "label": "2020, operating leases"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount": {
     "auth_ref": [
      "r476"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.",
        "label": "us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount",
        "negatedLabel": "Less: Interest, operating leases"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityUndiscountedExcessAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseRenewalTerm": {
     "auth_ref": [
      "r465"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "us-gaap_LesseeOperatingLeaseRenewalTerm",
        "terseLabel": "Lessee, Operating Lease, Renewal Term (Year)"
       }
      }
     },
     "localname": "LesseeOperatingLeaseRenewalTerm",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_Liabilities": {
     "auth_ref": [
      "r71",
      "r138",
      "r206",
      "r228",
      "r415",
      "r421",
      "r422",
      "r439"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.",
        "label": "us-gaap_Liabilities",
        "terseLabel": "Liabilities, Total"
       }
      }
     },
     "localname": "Liabilities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesAndStockholdersEquity": {
     "auth_ref": [
      "r54",
      "r138",
      "r228",
      "r439",
      "r500",
      "r525"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.",
        "label": "us-gaap_LiabilitiesAndStockholdersEquity",
        "totalLabel": "Liabilities and Equity, Total"
       }
      }
     },
     "localname": "LiabilitiesAndStockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesCurrent": {
     "auth_ref": [
      "r73",
      "r138",
      "r228",
      "r415",
      "r421",
      "r422",
      "r439"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.",
        "label": "us-gaap_LiabilitiesCurrent",
        "totalLabel": "Total current liabilities"
       }
      }
     },
     "localname": "LiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesCurrentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Current liabilities:"
       }
      }
     },
     "localname": "LiabilitiesCurrentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r22",
      "r26",
      "r272"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as liabilities attributable to disposal group held for sale or disposed of.",
        "label": "us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation",
        "totalLabel": "Total liabilities"
       }
      }
     },
     "localname": "LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r22",
      "r26",
      "r267",
      "r272"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      },
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details": {
       "order": 0.0,
       "parentTag": "us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.",
        "label": "Current liabilities of discontinued operations (Note 10)",
        "totalLabel": "Total current liabilities"
       }
      }
     },
     "localname": "LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent": {
     "auth_ref": [
      "r1",
      "r2",
      "r20",
      "r22",
      "r26",
      "r266",
      "r272"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      },
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of beyond one year or the normal operating cycle, if longer.",
        "label": "Noncurrent liabilities of discontinued operations (Note 10)",
        "terseLabel": "Noncurrent liabilities"
       }
      }
     },
     "localname": "LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCredit": {
     "auth_ref": [
      "r45",
      "r499",
      "r517"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.",
        "label": "Lines of Credit",
        "terseLabel": "Long-term Line of Credit, Total"
       }
      }
     },
     "localname": "LineOfCredit",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity": {
     "auth_ref": [
      "r69"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.",
        "label": "us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity",
        "terseLabel": "Line of Credit Facility, Maximum Borrowing Capacity"
       }
      }
     },
     "localname": "LineOfCreditFacilityMaximumBorrowingCapacity",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansPayableToBankCurrent": {
     "auth_ref": [
      "r43"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of current portion of long-term loans payable to bank due within one year or the operating cycle if longer.",
        "label": "Current installments of long-term debt"
       }
      }
     },
     "localname": "LoansPayableToBankCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LondonInterbankOfferedRateLIBORMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest rate at which a bank borrows funds from other banks in the London interbank market.",
        "label": "London Interbank Offered Rate (LIBOR) [Member]"
       }
      }
     },
     "localname": "LondonInterbankOfferedRateLIBORMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis": {
     "auth_ref": [
      "r11"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the assets held for sale.",
        "label": "Long Lived Assets Held-for-sale by Asset Type [Axis]"
       }
      }
     },
     "localname": "LongLivedAssetsHeldForSaleByAssetTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongLivedAssetsHeldForSaleNameDomain": {
     "auth_ref": [
      "r11"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A name of the assets to be disposed.",
        "label": "Long Lived Assets Held-for-sale, Name [Domain]"
       }
      }
     },
     "localname": "LongLivedAssetsHeldForSaleNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LongTermDebt": {
     "auth_ref": [
      "r45",
      "r311",
      "r499",
      "r522"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.",
        "label": "us-gaap_LongTermDebt",
        "terseLabel": "Long-term Debt, Total"
       }
      }
     },
     "localname": "LongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtCurrent": {
     "auth_ref": [
      "r70"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.",
        "label": "us-gaap_LongTermDebtCurrent",
        "negatedLabel": "Less: current portion",
        "terseLabel": "Long-term Debt, Current Maturities, Total"
       }
      }
     },
     "localname": "LongTermDebtCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtFairValue": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.",
        "label": "us-gaap_LongTermDebtFairValue",
        "terseLabel": "Long-term Debt, Fair Value"
       }
      }
     },
     "localname": "LongTermDebtFairValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtNoncurrent": {
     "auth_ref": [
      "r76"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.",
        "label": "us-gaap_LongTermDebtNoncurrent",
        "terseLabel": "Total long-term debt"
       }
      }
     },
     "localname": "LongTermDebtNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermLoansFromBank": {
     "auth_ref": [
      "r45",
      "r499",
      "r521"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 6.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the operating cycle if longer, excluding current portion.",
        "label": "Long-term debt"
       }
      }
     },
     "localname": "LongTermLoansFromBank",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongtermDebtTypeAxis": {
     "auth_ref": [
      "r76"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of long-term debt.",
        "label": "Long-term Debt, Type [Axis]"
       }
      }
     },
     "localname": "LongtermDebtTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongtermDebtTypeDomain": {
     "auth_ref": [
      "r76",
      "r308"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of long-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.",
        "label": "Long-term Debt, Type [Domain]"
       }
      }
     },
     "localname": "LongtermDebtTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LossContingencyDisclosures": {
     "auth_ref": [
      "r294",
      "r295"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for loss and gain contingencies. Describes any existing condition, situation, or set of circumstances involving uncertainty as of the balance sheet date (or prior to issuance of the financial statements) as to a probable or reasonably possible loss incurred by an entity that will ultimately be resolved when one or more future events occur or fail to occur, and typically discloses the amount of loss recorded or a range of possible loss, or an assertion that no reasonable estimate can be made.",
        "label": "Contingencies Disclosure [Text Block]"
       }
      }
     },
     "localname": "LossContingencyDisclosures",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-11-contingencies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_MachineryAndEquipmentMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.",
        "label": "Machinery and Equipment [Member]"
       }
      }
     },
     "localname": "MachineryAndEquipmentMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_MinorityInterestPeriodIncreaseDecrease": {
     "auth_ref": [
      "r409"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.",
        "label": "us-gaap_MinorityInterestPeriodIncreaseDecrease",
        "terseLabel": "Noncontrolling interest"
       }
      }
     },
     "localname": "MinorityInterestPeriodIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_MoneyMarketFundsMember": {
     "auth_ref": [
      "r328"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fund that invests in short-term money-market instruments, for example, but not limited to, commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and other highly liquid securities.",
        "label": "Money Market Funds [Member]"
       }
      }
     },
     "localname": "MoneyMarketFundsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivities": {
     "auth_ref": [
      "r123"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.",
        "label": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
        "totalLabel": "Net cash used in financing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Cash flows from financing activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Cash flows from investing activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivities": {
     "auth_ref": [
      "r123",
      "r125",
      "r128"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.",
        "label": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
        "totalLabel": "Net cash provided by (used in) operating activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Cash flows from operating activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetIncomeLoss": {
     "auth_ref": [
      "r26",
      "r90",
      "r93",
      "r102",
      "r128",
      "r138",
      "r147",
      "r151",
      "r152",
      "r153",
      "r154",
      "r157",
      "r158",
      "r163",
      "r192",
      "r204",
      "r208",
      "r211",
      "r214",
      "r228",
      "r439",
      "r504",
      "r530"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 23.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.",
        "label": "Net loss attributable to Cohu",
        "totalLabel": "Net loss attributable to Cohu"
       }
      }
     },
     "localname": "NetIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetIncomeLossAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r90",
      "r93",
      "r157",
      "r158",
      "r417",
      "r424"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 24.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": -1.0
      },
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of Net Income (Loss) attributable to noncontrolling interest.",
        "label": "Net loss attributable to noncontrolling interest",
        "terseLabel": "Net loss attributable to noncontrolling interest"
       }
      }
     },
     "localname": "NetIncomeLossAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest": {
     "auth_ref": [
      "r313",
      "r417",
      "r418"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after income tax of income (loss) including the portion attributable to nonredeemable noncontrolling interest. Excludes the portion attributable to redeemable noncontrolling interest recognized as temporary equity.",
        "label": "us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest",
        "terseLabel": "Net income (loss)"
       }
      }
     },
     "localname": "NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.",
        "label": "New Accounting Pronouncements, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_NoncompeteAgreementsMember": {
     "auth_ref": [
      "r405"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Agreement in which one party agrees not to pursue a similar trade in competition with another party.",
        "label": "Noncompete Agreements [Member]"
       }
      }
     },
     "localname": "NoncompeteAgreementsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NoncontrollingInterestMember": {
     "auth_ref": [
      "r143",
      "r144",
      "r145",
      "r315",
      "r408"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This element represents that portion of equity (net assets) in a subsidiary not attributable, directly or indirectly, to the parent. A noncontrolling interest is sometimes called a minority interest.",
        "label": "Noncontrolling Interest [Member]"
       }
      }
     },
     "localname": "NoncontrollingInterestMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NonoperatingIncomeExpenseAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Other (expense) income:"
       }
      }
     },
     "localname": "NonoperatingIncomeExpenseAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NumberOfOperatingSegments": {
     "auth_ref": [
      "r180"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.",
        "label": "us-gaap_NumberOfOperatingSegments",
        "terseLabel": "Number of Operating Segments"
       }
      }
     },
     "localname": "NumberOfOperatingSegments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_NumberOfReportableSegments": {
     "auth_ref": [
      "r180"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.",
        "label": "us-gaap_NumberOfReportableSegments",
        "terseLabel": "Number of Reportable Segments"
       }
      }
     },
     "localname": "NumberOfReportableSegments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_OperatingIncomeLoss": {
     "auth_ref": [
      "r192",
      "r204",
      "r208",
      "r211",
      "r214"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net result for the period of deducting operating expenses from operating revenues.",
        "label": "us-gaap_OperatingIncomeLoss",
        "totalLabel": "Loss from operations"
       }
      }
     },
     "localname": "OperatingIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseCost": {
     "auth_ref": [
      "r467",
      "r477"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details": {
       "order": 1.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.",
        "label": "Operating leases"
       }
      }
     },
     "localname": "OperatingLeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseLiability": {
     "auth_ref": [
      "r459"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease.",
        "label": "Present value of lease liabilities, operating leases"
       }
      }
     },
     "localname": "OperatingLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseLiabilityCurrent": {
     "auth_ref": [
      "r459"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.",
        "label": "us-gaap_OperatingLeaseLiabilityCurrent",
        "terseLabel": "Operating, current"
       }
      }
     },
     "localname": "OperatingLeaseLiabilityCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseLiabilityNoncurrent": {
     "auth_ref": [
      "r459"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.",
        "label": "us-gaap_OperatingLeaseLiabilityNoncurrent",
        "terseLabel": "Operating, noncurrent"
       }
      }
     },
     "localname": "OperatingLeaseLiabilityNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasePayments": {
     "auth_ref": [
      "r463",
      "r471"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.",
        "label": "Operating cash flows from operating leases"
       }
      }
     },
     "localname": "OperatingLeasePayments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-cash-flow-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseRightOfUseAsset": {
     "auth_ref": [
      "r458"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details": {
       "order": 0.0,
       "parentTag": "cohu_LeaseRightofuseAsset",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's right to use underlying asset under operating lease.",
        "label": "Operating lease right of use assets",
        "terseLabel": "Operating lease assets"
       }
      }
     },
     "localname": "OperatingLeaseRightOfUseAsset",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent": {
     "auth_ref": [
      "r474",
      "r477"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average discount rate for operating lease calculated at point in time.",
        "label": "us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent",
        "terseLabel": "Operating leases"
       }
      }
     },
     "localname": "OperatingLeaseWeightedAverageDiscountRatePercent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1": {
     "auth_ref": [
      "r473",
      "r477"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1",
        "terseLabel": "Operating leases (Year)"
       }
      }
     },
     "localname": "OperatingLeaseWeightedAverageRemainingLeaseTerm1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_OtherAccruedLiabilitiesCurrent": {
     "auth_ref": [
      "r36",
      "r37",
      "r38",
      "r72"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.",
        "label": "Other accrued liabilities"
       }
      }
     },
     "localname": "OtherAccruedLiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherAccruedLiabilitiesNoncurrent": {
     "auth_ref": [
      "r77"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer.",
        "label": "us-gaap_OtherAccruedLiabilitiesNoncurrent",
        "terseLabel": "Other accrued liabilities"
       }
      }
     },
     "localname": "OtherAccruedLiabilitiesNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherAssetsCurrent": {
     "auth_ref": [
      "r81"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of current assets classified as other.",
        "label": "Other current assets"
       }
      }
     },
     "localname": "OtherAssetsCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherAssetsNoncurrent": {
     "auth_ref": [
      "r66"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of noncurrent assets classified as other.",
        "label": "Other assets"
       }
      }
     },
     "localname": "OtherAssetsNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r411",
      "r412",
      "r419"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to noncontrolling interests.",
        "label": "Changes in cumulative translation adjustment, attributable to non-controlling interest"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent": {
     "auth_ref": [
      "r411",
      "r412",
      "r419"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.",
        "label": "Changes in cumulative translation adjustment, attributable to parent",
        "terseLabel": "Foreign currency translation adjustments"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited",
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax": {
     "auth_ref": [
      "r83"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.",
        "label": "Changes in cumulative translation adjustment"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTax": {
     "auth_ref": [
      "r91",
      "r94",
      "r96",
      "r103",
      "r314",
      "r445",
      "r450",
      "r451",
      "r505",
      "r531"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments of other comprehensive income (loss).",
        "label": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
        "totalLabel": "Other comprehensive income (loss), net of tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r91",
      "r94",
      "r411",
      "r412",
      "r419"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests.",
        "label": "Other comprehensive loss attributable to noncontrolling interest"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent": {
     "auth_ref": [
      "r91",
      "r94",
      "r411",
      "r412",
      "r419"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of other comprehensive income (loss) attributable to parent entity.",
        "label": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
        "totalLabel": "Other comprehensive income (loss) attributable to Cohu"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax": {
     "auth_ref": [
      "r84",
      "r86"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.",
        "label": "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax",
        "negatedLabel": "Adjustments related to postretirement benefits, net of tax",
        "negatedTerseLabel": "Adjustments related to postretirement benefits"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited",
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherRestructuringMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Restructuring and related activities classified as other.",
        "label": "Other Restructuring [Member]"
       }
      }
     },
     "localname": "OtherRestructuringMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PaymentsForRestructuring": {
     "auth_ref": [
      "r121",
      "r278"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.",
        "label": "us-gaap_PaymentsForRestructuring",
        "negatedTerseLabel": "Amounts paid or charged"
       }
      }
     },
     "localname": "PaymentsForRestructuring",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsOfDividendsCommonStock": {
     "auth_ref": [
      "r118"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.",
        "label": "us-gaap_PaymentsOfDividendsCommonStock",
        "negatedLabel": "Cash dividends paid"
       }
      }
     },
     "localname": "PaymentsOfDividendsCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment": {
     "auth_ref": [
      "r116"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.",
        "label": "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment",
        "negatedLabel": "Purchases of property, plant and equipment"
       }
      }
     },
     "localname": "PaymentsToAcquirePropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionAndOtherPostretirementBenefitExpense": {
     "auth_ref": [],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cost (reversal of cost) for pension and other postretirement benefits.",
        "label": "Increase in accrued retiree medical benefits"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementBenefitExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionAndOtherPostretirementPlansPolicy": {
     "auth_ref": [
      "r135",
      "r335",
      "r337",
      "r338",
      "r339",
      "r341"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for pension and other postretirement benefit plans. This accounting policy may address (1) the types of plans sponsored by the entity, and the benefits provided by each plan (2) groups that participate in (or are covered by) each plan (3) how plan assets, liabilities and expenses are measured, including the use of any actuaries and (4) significant assumptions used by the entity to value plan assets and liabilities and how such assumptions are derived.",
        "label": "Pension and Other Postretirement Plans, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementPlansPolicy",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PerformanceSharesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Share-based payment arrangement awarded for meeting performance target.",
        "label": "Performance Shares [Member]"
       }
      }
     },
     "localname": "PerformanceSharesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PlanNameAxis": {
     "auth_ref": [
      "r348",
      "r365"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by plan name for share-based payment arrangement.",
        "label": "Plan Name [Axis]"
       }
      }
     },
     "localname": "PlanNameAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PlanNameDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plan name for share-based payment arrangement.",
        "label": "Plan Name [Domain]"
       }
      }
     },
     "localname": "PlanNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PolicyTextBlockAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "us-gaap_PolicyTextBlockAbstract",
        "terseLabel": "Accounting Policies"
       }
      }
     },
     "localname": "PolicyTextBlockAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PostemploymentBenefitsLiabilityNoncurrent": {
     "auth_ref": [
      "r325",
      "r326"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement that is payable after one year (or beyond the operating cycle if longer).",
        "label": "Accrued retirement benefits"
       }
      }
     },
     "localname": "PostemploymentBenefitsLiabilityNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PreferredStockParOrStatedValuePerShare": {
     "auth_ref": [
      "r47"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.",
        "label": "Preferred stock, par value (in dollars per share)"
       }
      }
     },
     "localname": "PreferredStockParOrStatedValuePerShare",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_PreferredStockSharesAuthorized": {
     "auth_ref": [
      "r47"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.",
        "label": "Preferred stock, shares authorized (in shares)"
       }
      }
     },
     "localname": "PreferredStockSharesAuthorized",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_PreferredStockSharesIssued": {
     "auth_ref": [
      "r47"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.",
        "label": "Preferred stock, shares issued (in shares)"
       }
      }
     },
     "localname": "PreferredStockSharesIssued",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_PreferredStockValue": {
     "auth_ref": [
      "r47"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.",
        "label": "Preferred stock, $1 par value; 1,000 shares authorized, none issued"
       }
      }
     },
     "localname": "PreferredStockValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PrepaidExpenseCurrent": {
     "auth_ref": [
      "r31",
      "r33",
      "r239",
      "r240"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.",
        "label": "Prepaid expenses"
       }
      }
     },
     "localname": "PrepaidExpenseCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PriorPeriodReclassificationAdjustmentDescription": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for reclassification affecting comparability of financial statement. Excludes amendment to accounting standards, other change in accounting principle, and correction of error.",
        "label": "Reclassification, Comparability Adjustment [Policy Text Block]"
       }
      }
     },
     "localname": "PriorPeriodReclassificationAdjustmentDescription",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested": {
     "auth_ref": [
      "r114"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This element represents the cash inflow during the period from the sale of a component of the entity.",
        "label": "Net cash received from sale of fixtures services business"
       }
      }
     },
     "localname": "ProceedsFromDivestitureOfBusinessesNetOfCashDivested",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromIssuanceOfLongTermDebt": {
     "auth_ref": [
      "r117"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.",
        "label": "Proceeds from revolving line of credit and construction loans",
        "terseLabel": "Proceeds from Issuance of Long-term Debt, Total"
       }
      }
     },
     "localname": "ProceedsFromIssuanceOfLongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromRepurchaseOfEquity": {
     "auth_ref": [
      "r141"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net cash inflow or outflow resulting from the entity's share transaction.",
        "label": "Issuance (repurchases) of common stock, net"
       }
      }
     },
     "localname": "ProceedsFromRepurchaseOfEquity",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromSalesOfAssetsInvestingActivities": {
     "auth_ref": [
      "r115"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate cash proceeds received from a combination of transactions that are classified as investing activities in which assets, which may include one or more investments, are sold to third-party buyers. This element can be used by entities to aggregate proceeds from all asset sales that are classified as investing activities.",
        "label": "Cash received from sale of fixed assets"
       }
      }
     },
     "localname": "ProceedsFromSalesOfAssetsInvestingActivities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProductWarrantyAccrual": {
     "auth_ref": [
      "r302",
      "r303",
      "r501"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.",
        "label": "us-gaap_ProductWarrantyAccrual",
        "periodEndLabel": "Balance at end of period",
        "periodStartLabel": "Balance at beginning of period"
       }
      }
     },
     "localname": "ProductWarrantyAccrual",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-changes-in-accrued-warranty-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProductWarrantyAccrualClassifiedCurrent": {
     "auth_ref": [
      "r72",
      "r297",
      "r298"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 8.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
        "label": "Accrued warranty"
       }
      }
     },
     "localname": "ProductWarrantyAccrualClassifiedCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProductWarrantyAccrualNoncurrent": {
     "auth_ref": [
      "r77",
      "r292",
      "r293"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.",
        "label": "us-gaap_ProductWarrantyAccrualNoncurrent",
        "terseLabel": "Product Warranty Accrual, Noncurrent"
       }
      }
     },
     "localname": "ProductWarrantyAccrualNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProductWarrantyAccrualPayments": {
     "auth_ref": [
      "r299"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.",
        "label": "us-gaap_ProductWarrantyAccrualPayments",
        "negatedTerseLabel": "Warranty payments"
       }
      }
     },
     "localname": "ProductWarrantyAccrualPayments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-changes-in-accrued-warranty-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProductWarrantyAccrualWarrantiesIssued": {
     "auth_ref": [
      "r300"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase in the standard and extended product warranty accrual from warranties issued.",
        "label": "Warranty expense accruals"
       }
      }
     },
     "localname": "ProductWarrantyAccrualWarrantiesIssued",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-changes-in-accrued-warranty-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProfitLoss": {
     "auth_ref": [
      "r26",
      "r90",
      "r93",
      "r122",
      "r138",
      "r147",
      "r157",
      "r158",
      "r192",
      "r204",
      "r208",
      "r211",
      "r214",
      "r228",
      "r411",
      "r416",
      "r418",
      "r424",
      "r425",
      "r439",
      "r511"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
       "weight": 1.0
      },
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.",
        "label": "Net loss",
        "totalLabel": "Net loss"
       }
      }
     },
     "localname": "ProfitLoss",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentByTypeAxis": {
     "auth_ref": [
      "r65",
      "r270"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of long-lived, physical assets used to produce goods and services and not intended for resale.",
        "label": "Long-Lived Tangible Asset [Axis]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentByTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentGross": {
     "auth_ref": [
      "r64",
      "r268"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details": {
       "order": 0.0,
       "parentTag": "us-gaap_PropertyPlantAndEquipmentNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
        "label": "Property, plant and equipment"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentGross",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentNet": {
     "auth_ref": [
      "r41",
      "r42",
      "r270",
      "r526"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
        "label": "Property, plant and equipment, net",
        "totalLabel": "Property, plant and equipment, net"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentPolicyTextBlock": {
     "auth_ref": [
      "r63",
      "r135",
      "r270",
      "r573",
      "r574"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections.",
        "label": "Property, Plant and Equipment, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentTextBlock": {
     "auth_ref": [
      "r41",
      "r270"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.",
        "label": "Property, Plant and Equipment [Table Text Block]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentTypeDomain": {
     "auth_ref": [
      "r41",
      "r268"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Listing of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.",
        "label": "Long-Lived Tangible Asset [Domain]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentUsefulLife": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.",
        "label": "us-gaap_PropertyPlantAndEquipmentUsefulLife",
        "terseLabel": "Property, Plant and Equipment, Useful Life (Year)"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentUsefulLife",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_RepaymentsOfLongTermDebt": {
     "auth_ref": [
      "r119"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.",
        "label": "us-gaap_RepaymentsOfLongTermDebt",
        "negatedLabel": "Repayments of long-term debt"
       }
      }
     },
     "localname": "RepaymentsOfLongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReportingUnitAxis": {
     "auth_ref": [
      "r248",
      "r249"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by reporting unit.",
        "label": "Reporting Unit [Axis]"
       }
      }
     },
     "localname": "ReportingUnitAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ReportingUnitDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Level of reporting at which goodwill is tested for impairment.",
        "label": "Reporting Unit [Domain]"
       }
      }
     },
     "localname": "ReportingUnitDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ResearchAndDevelopmentExpense": {
     "auth_ref": [
      "r378",
      "r585"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_CostsAndExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.",
        "label": "Research and development"
       }
      }
     },
     "localname": "ResearchAndDevelopmentExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ResearchAndDevelopmentExpenseMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption in which the reported facts about research and development expense have been included.",
        "label": "Research and Development Expense [Member]"
       }
      }
     },
     "localname": "ResearchAndDevelopmentExpenseMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of cash and cash equivalent. Cash is currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash and Cash Equivalents [Domain]"
       }
      }
     },
     "localname": "RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RestrictedStockUnitsRSUMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met.",
        "label": "Restricted Stock Units (RSUs) [Member]"
       }
      }
     },
     "localname": "RestrictedStockUnitsRSUMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock": {
     "auth_ref": [
      "r290"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.",
        "label": "Restructuring and Related Activities Disclosure [Text Block]"
       }
      }
     },
     "localname": "RestructuringAndRelatedActivitiesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RestructuringCharges": {
     "auth_ref": [
      "r127",
      "r277",
      "r282",
      "r287"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_CostsAndExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.",
        "label": "Restructuring charges",
        "terseLabel": "Restructuring Charges, Total"
       }
      }
     },
     "localname": "RestructuringCharges",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RestructuringCostAndReserveAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of restructuring cost.",
        "label": "Restructuring Type [Axis]"
       }
      }
     },
     "localname": "RestructuringCostAndReserveAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RestructuringPlanAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by individual restructuring plan.",
        "label": "Restructuring Plan [Axis]"
       }
      }
     },
     "localname": "RestructuringPlanAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RestructuringPlanDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Identification of the individual restructuring plans.",
        "label": "Restructuring Plan [Domain]"
       }
      }
     },
     "localname": "RestructuringPlanDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RestructuringReserve": {
     "auth_ref": [
      "r278",
      "r285"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.",
        "label": "us-gaap_RestructuringReserve",
        "periodEndLabel": "Accrued restructuring, ending balance",
        "periodStartLabel": "Accrued restructuring, beginning balance"
       }
      }
     },
     "localname": "RestructuringReserve",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RestructuringReserveTranslationAndOtherAdjustment": {
     "auth_ref": [
      "r278",
      "r284"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in the restructuring reserve related to foreign currency translation (gain) loss and other increases (decreases).",
        "label": "us-gaap_RestructuringReserveTranslationAndOtherAdjustment",
        "terseLabel": "Impact of currency exchange"
       }
      }
     },
     "localname": "RestructuringReserveTranslationAndOtherAdjustment",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RetainedEarningsAccumulatedDeficit": {
     "auth_ref": [
      "r50",
      "r315",
      "r373",
      "r524",
      "r549",
      "r554"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
        "label": "Retained earnings"
       }
      }
     },
     "localname": "RetainedEarningsAccumulatedDeficit",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RetainedEarningsMember": {
     "auth_ref": [
      "r143",
      "r144",
      "r145",
      "r148",
      "r156",
      "r158",
      "r232",
      "r370",
      "r371",
      "r372",
      "r390",
      "r391",
      "r545",
      "r547"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
        "label": "Retained Earnings [Member]"
       }
      }
     },
     "localname": "RetainedEarningsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax": {
     "auth_ref": [
      "r183",
      "r184",
      "r203",
      "r209",
      "r210",
      "r217",
      "r218",
      "r221",
      "r319",
      "r320",
      "r488"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_OperatingIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.",
        "label": "Net sales"
       }
      }
     },
     "localname": "RevenueFromContractWithCustomerIncludingAssessedTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RevenueRecognitionPolicyTextBlock": {
     "auth_ref": [
      "r136",
      "r137"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for revenue. Includes revenue from contract with customer and from other sources.",
        "label": "Revenue [Policy Text Block]"
       }
      }
     },
     "localname": "RevenueRecognitionPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RevenueRemainingPerformanceObligation": {
     "auth_ref": [
      "r318"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of transaction price allocated to performance obligation that has not been recognized as revenue.",
        "label": "us-gaap_RevenueRemainingPerformanceObligation",
        "terseLabel": "Revenue, Remaining Performance Obligation, Amount"
       }
      }
     },
     "localname": "RevenueRemainingPerformanceObligation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RevolvingCreditFacilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount.",
        "label": "Revolving Credit Facility [Member]"
       }
      }
     },
     "localname": "RevolvingCreditFacilityMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability": {
     "auth_ref": [
      "r472",
      "r477"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase in right-of-use asset obtained in exchange for finance lease liability.",
        "label": "Leased assets obtained in exchange for new finance lease liabilities"
       }
      }
     },
     "localname": "RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-cash-flow-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability": {
     "auth_ref": [
      "r472",
      "r477"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase in right-of-use asset obtained in exchange for operating lease liability.",
        "label": "Leased assets obtained in exchange for new operating lease liabilities"
       }
      }
     },
     "localname": "RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-cash-flow-information-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SalesRevenueNetMember": {
     "auth_ref": [
      "r176",
      "r221"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Revenue from sale of product and rendering of service and other sources of income, when it serves as benchmark in concentration of risk calculation.",
        "label": "Revenue Benchmark [Member]"
       }
      }
     },
     "localname": "SalesRevenueNetMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ScheduleOfDebtTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.",
        "label": "Schedule of Debt [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfDebtTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock": {
     "auth_ref": [
      "r2",
      "r11",
      "r12",
      "r13",
      "r14",
      "r15",
      "r16",
      "r21",
      "r24",
      "r25",
      "r26",
      "r274",
      "r275"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.",
        "label": "Disposal Groups, Including Discontinued Operations [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": {
     "auth_ref": [
      "r166"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.",
        "label": "Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock": {
     "auth_ref": [
      "r347",
      "r362",
      "r374"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.",
        "label": "Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfGoodwillTextBlock": {
     "auth_ref": [
      "r247",
      "r250"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.",
        "label": "Schedule of Goodwill [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfGoodwillTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfInventoryCurrentTableTextBlock": {
     "auth_ref": [
      "r39",
      "r59",
      "r60",
      "r61"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.",
        "label": "Schedule of Inventory, Current [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfInventoryCurrentTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock": {
     "auth_ref": [
      "r304"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability.",
        "label": "Schedule of Product Warranty Liability [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfProductWarrantyLiabilityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock": {
     "auth_ref": [
      "r280",
      "r281",
      "r286"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets.",
        "label": "Restructuring and Related Costs [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfRestructuringAndRelatedCostsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock": {
     "auth_ref": [
      "r192",
      "r195",
      "r207",
      "r247"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.",
        "label": "Schedule of Segment Reporting Information, by Segment [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfSegmentReportingInformationBySegmentTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock": {
     "auth_ref": [
      "r174",
      "r176",
      "r177",
      "r178",
      "r436",
      "r438"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.",
        "label": "Schedules of Concentration of Risk, by Risk Factor [Table Text Block]"
       }
      }
     },
     "localname": "SchedulesOfConcentrationOfRiskByRiskFactorTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SegmentDomain": {
     "auth_ref": [
      "r179",
      "r183",
      "r184",
      "r185",
      "r186",
      "r187",
      "r188",
      "r189",
      "r190",
      "r191",
      "r192",
      "r193",
      "r194",
      "r203",
      "r204",
      "r205",
      "r206",
      "r208",
      "r209",
      "r210",
      "r211",
      "r212",
      "r214",
      "r221",
      "r537"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity.",
        "label": "Segments [Domain]"
       }
      }
     },
     "localname": "SegmentDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SegmentReportingDisclosureTextBlock": {
     "auth_ref": [
      "r179",
      "r181",
      "r182",
      "r192",
      "r196",
      "r208",
      "r212",
      "r213",
      "r214",
      "r215",
      "r217",
      "r220",
      "r221",
      "r222"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.",
        "label": "Segment Reporting Disclosure [Text Block]"
       }
      }
     },
     "localname": "SegmentReportingDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SegmentReportingInformationProfitLossAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Segment profit (loss) before tax:"
       }
      }
     },
     "localname": "SegmentReportingInformationProfitLossAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SegmentReportingInformationRevenueAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net sales by segment:"
       }
      }
     },
     "localname": "SegmentReportingInformationRevenueAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SegmentReportingPolicyPolicyTextBlock": {
     "auth_ref": [
      "r135",
      "r197",
      "r198",
      "r199",
      "r200",
      "r201",
      "r202",
      "r218"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for segment reporting.",
        "label": "Segment Reporting, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "SegmentReportingPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SellingGeneralAndAdministrativeExpense": {
     "auth_ref": [
      "r112"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_CostsAndExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.",
        "label": "Selling, general and administrative"
       }
      }
     },
     "localname": "SellingGeneralAndAdministrativeExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SellingGeneralAndAdministrativeExpensesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing selling, general and administrative expense.",
        "label": "Selling, General and Administrative Expenses [Member]"
       }
      }
     },
     "localname": "SellingGeneralAndAdministrativeExpensesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShareBasedCompensation": {
     "auth_ref": [
      "r126"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of noncash expense for share-based payment arrangement.",
        "label": "us-gaap_ShareBasedCompensation",
        "terseLabel": "Share-based compensation expense"
       }
      }
     },
     "localname": "ShareBasedCompensation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1": {
     "auth_ref": [
      "r349"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.",
        "label": "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod": {
     "auth_ref": [
      "r356"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.",
        "label": "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod": {
     "auth_ref": [
      "r358"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).",
        "label": "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber": {
     "auth_ref": [
      "r357"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.",
        "label": "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms": {
     "auth_ref": [
      "r360"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms (Year)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod": {
     "auth_ref": [
      "r359"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.",
        "label": "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant": {
     "auth_ref": [
      "r365"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.",
        "label": "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber": {
     "auth_ref": [
      "r354"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.",
        "label": "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gross number of share options (or share units) granted during the period.",
        "label": "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice": {
     "auth_ref": [
      "r353"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.",
        "label": "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain": {
     "auth_ref": [
      "r346",
      "r351"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Award under share-based payment arrangement.",
        "label": "Award Type [Domain]"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy": {
     "auth_ref": [
      "r135",
      "r348",
      "r352"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for award under share-based payment arrangement. Includes, but is not limited to, methodology and assumption used in measuring cost.",
        "label": "Share-based Payment Arrangement [Policy Text Block]"
       }
      }
     },
     "localname": "ShareBasedCompensationOptionAndIncentivePlansPolicy",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage": {
     "auth_ref": [
      "r349"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of vesting of award under share-based payment arrangement.",
        "label": "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.",
        "label": "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod": {
     "auth_ref": [
      "r350"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1": {
     "auth_ref": [
      "r365"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.",
        "label": "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2": {
     "auth_ref": [
      "r360"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_ShortTermBankLoansAndNotesPayable": {
     "auth_ref": [
      "r67",
      "r527"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 0.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of borrowings from a bank classified as other, maturing within one year or operating cycle, if longer.",
        "label": "Short-term borrowings"
       }
      }
     },
     "localname": "ShortTermBankLoansAndNotesPayable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShortTermLeaseCost": {
     "auth_ref": [
      "r468",
      "r477"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details": {
       "order": 5.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of short-term lease cost, excluding expense for lease with term of one month or less.",
        "label": "Short-term operating leases"
       }
      }
     },
     "localname": "ShortTermLeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SignificantAccountingPoliciesTextBlock": {
     "auth_ref": [
      "r142"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for all significant accounting policies of the reporting entity.",
        "label": "Significant Accounting Policies [Text Block]"
       }
      }
     },
     "localname": "SignificantAccountingPoliciesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_StandardProductWarrantyPolicy": {
     "auth_ref": [
      "r135",
      "r301"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for standard warranties including the methodology for measuring the liability.",
        "label": "Standard Product Warranty, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "StandardProductWarrantyPolicy",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_StatementBusinessSegmentsAxis": {
     "auth_ref": [
      "r10",
      "r179",
      "r183",
      "r184",
      "r185",
      "r186",
      "r187",
      "r188",
      "r189",
      "r190",
      "r191",
      "r192",
      "r193",
      "r194",
      "r203",
      "r204",
      "r205",
      "r206",
      "r208",
      "r209",
      "r210",
      "r211",
      "r212",
      "r214",
      "r221",
      "r247",
      "r273",
      "r279",
      "r288",
      "r537"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by business segments.",
        "label": "Segments [Axis]"
       }
      }
     },
     "localname": "StatementBusinessSegmentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementEquityComponentsAxis": {
     "auth_ref": [
      "r78",
      "r143",
      "r144",
      "r145",
      "r148",
      "r156",
      "r158",
      "r172",
      "r232",
      "r314",
      "r315",
      "r370",
      "r371",
      "r372",
      "r390",
      "r391",
      "r445",
      "r446",
      "r447",
      "r448",
      "r449",
      "r451",
      "r545",
      "r546",
      "r547"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by component of equity.",
        "label": "Equity Components [Axis]"
       }
      }
     },
     "localname": "StatementEquityComponentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Statement [Line Items]"
       }
      }
     },
     "localname": "StatementLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited-parentheticals",
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited-parentheticals",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-tables",
      "http://www.cohu.com/20200627/role/statement-note-11-contingencies",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-changes-in-accrued-warranty-details",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-tables",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-tables",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-tables",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-tables",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-tables",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes",
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-tables",
      "http://www.cohu.com/20200627/role/statement-note-9-leases",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-cash-flow-information-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-tables",
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfCashFlowsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Cash Flows [Abstract]"
       }
      }
     },
     "localname": "StatementOfCashFlowsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfFinancialPositionAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Financial Position [Abstract]"
       }
      }
     },
     "localname": "StatementOfFinancialPositionAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Comprehensive Income [Abstract]"
       }
      }
     },
     "localname": "StatementOfIncomeAndComprehensiveIncomeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfStockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Stockholders' Equity [Abstract]"
       }
      }
     },
     "localname": "StatementOfStockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementTable": {
     "auth_ref": [
      "r143",
      "r144",
      "r145",
      "r172",
      "r488"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule reflecting a Statement of Income, Statement of Cash Flows, Statement of Financial Position, Statement of Shareholders' Equity and Other Comprehensive Income, or other statement as needed.",
        "label": "Statement [Table]"
       }
      }
     },
     "localname": "StatementTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-comprehensive-loss-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited-parentheticals",
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited-parentheticals",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-customer-concentration-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-disaggregation-of-revenue-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-inventories-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-property-plant-and-equipment-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-reported-sharebased-compensation-details",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-balance-sheet-information-for-fixture-services-business-details",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-summary-of-operating-results-details",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-tables",
      "http://www.cohu.com/20200627/role/statement-note-11-contingencies",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-changes-in-accrued-warranty-details",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-tables",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-changes-in-carrying-value-of-goodwill-details",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-tables",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-summary-of-borrowings-details",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-tables",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-tables",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-assets-measured-at-fair-value-on-recurring-basis-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-effective-maturities-of-shortterm-investments-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-shortterm-investments-by-security-type-details",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-tables",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes",
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-summary-of-current-segments-details",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-tables",
      "http://www.cohu.com/20200627/role/statement-note-9-leases",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-balance-sheet-information-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-cash-flow-information-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-details-textual",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-future-minimum-lease-payments-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-tables",
      "http://www.cohu.com/20200627/role/statement-significant-accounting-policies-policies"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockIssuedDuringPeriodSharesNewIssues": {
     "auth_ref": [
      "r47",
      "r48",
      "r314",
      "r315"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of new stock issued during the period.",
        "label": "us-gaap_StockIssuedDuringPeriodSharesNewIssues",
        "terseLabel": "Stock Issued During Period, Shares, New Issues (in shares)"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodSharesNewIssues",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised": {
     "auth_ref": [
      "r47",
      "r48",
      "r314",
      "r315",
      "r355"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of share options (or share units) exercised during the current period.",
        "label": "us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodSharesStockOptionsExercised",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan": {
     "auth_ref": [
      "r47",
      "r48",
      "r314",
      "r315"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.",
        "label": "Shares issued under ESPP"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueEmployeeStockPurchasePlan",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross": {
     "auth_ref": [
      "r47",
      "r48",
      "r314",
      "r315"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate value of stock related to Restricted Stock Awards issued during the period.",
        "label": "Shares issued for restricted stock units vested"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueRestrictedStockAwardGross",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised": {
     "auth_ref": [
      "r78",
      "r314",
      "r315"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Value of stock issued as a result of the exercise of stock options.",
        "label": "Exercise of stock options"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueStockOptionsExercised",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockRepurchasedAndRetiredDuringPeriodValue": {
     "auth_ref": [
      "r47",
      "r48",
      "r314",
      "r315"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).",
        "label": "us-gaap_StockRepurchasedAndRetiredDuringPeriodValue",
        "negatedLabel": "Repurchase and retirement of stock"
       }
      }
     },
     "localname": "StockRepurchasedAndRetiredDuringPeriodValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquity": {
     "auth_ref": [
      "r48",
      "r52",
      "r53",
      "r138",
      "r223",
      "r228",
      "r439"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited": {
       "order": 7.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.",
        "label": "us-gaap_StockholdersEquity",
        "totalLabel": "Total stockholders\u2019 equity"
       }
      }
     },
     "localname": "StockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Stockholders' equity:"
       }
      }
     },
     "localname": "StockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r138",
      "r143",
      "r144",
      "r145",
      "r148",
      "r156",
      "r228",
      "r232",
      "r315",
      "r370",
      "r371",
      "r372",
      "r390",
      "r391",
      "r408",
      "r409",
      "r423",
      "r439",
      "r445",
      "r446",
      "r451",
      "r546",
      "r547"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.",
        "label": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
        "periodEndLabel": "Balance",
        "periodStartLabel": "Balance",
        "terseLabel": "Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance"
       }
      }
     },
     "localname": "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SubleaseIncome": {
     "auth_ref": [
      "r470",
      "r477"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details": {
       "order": 4.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of sublease income excluding finance and operating lease expense.",
        "label": "us-gaap_SubleaseIncome",
        "negatedLabel": "Sublease income"
       }
      }
     },
     "localname": "SubleaseIncome",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SupplementalCashFlowInformationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Supplemental disclosure of cash flow information:"
       }
      }
     },
     "localname": "SupplementalCashFlowInformationAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_TableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "us-gaap_TableTextBlock",
        "terseLabel": "Notes Tables"
       }
      }
     },
     "localname": "TableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-tables",
      "http://www.cohu.com/20200627/role/statement-note-10-discontinued-operations-tables",
      "http://www.cohu.com/20200627/role/statement-note-12-guarantees-tables",
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-tables",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-tables",
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-tables",
      "http://www.cohu.com/20200627/role/statement-note-5-financial-instruments-measured-at-fair-value-tables",
      "http://www.cohu.com/20200627/role/statement-note-8-segment-and-geographic-information-tables",
      "http://www.cohu.com/20200627/role/statement-note-9-leases-tables"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_TradeNamesMember": {
     "auth_ref": [
      "r404"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rights acquired through registration of a business name to gain or protect exclusive use thereof.",
        "label": "Trade Names [Member]"
       }
      }
     },
     "localname": "TradeNamesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-2-goodwill-and-purchased-intangible-assets-purchased-intangible-assets-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TypeOfAdoptionMember": {
     "auth_ref": [
      "r147",
      "r148",
      "r149",
      "r150",
      "r229",
      "r230",
      "r231",
      "r232",
      "r233",
      "r234",
      "r366",
      "r367",
      "r368",
      "r369",
      "r370",
      "r371",
      "r372",
      "r373",
      "r388",
      "r389",
      "r390",
      "r391",
      "r490",
      "r491",
      "r492",
      "r543",
      "r544",
      "r545",
      "r546",
      "r547",
      "r548",
      "r549",
      "r550",
      "r551",
      "r552",
      "r553",
      "r554"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amendment to accounting standards.",
        "label": "Accounting Standards Update [Domain]"
       }
      }
     },
     "localname": "TypeOfAdoptionMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-consolidated-statements-of-stockholders-equity-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TypeOfRestructuringDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Identification of the types of restructuring costs.",
        "label": "Type of Restructuring [Domain]"
       }
      }
     },
     "localname": "TypeOfRestructuringDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-4-restructuring-charges-charges-related-to-the-wind-down-plan-details"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease": {
     "auth_ref": [
      "r384"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.",
        "label": "us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease",
        "terseLabel": "Unrecognized Tax Benefits, Period Increase (Decrease), Total"
       }
      }
     },
     "localname": "UnrecognizedTaxBenefitsPeriodIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-7-income-taxes-details-textual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_VariableLeaseCost": {
     "auth_ref": [
      "r469",
      "r477"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details": {
       "order": 3.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.",
        "label": "Variable lease expense"
       }
      }
     },
     "localname": "VariableLeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-9-leases-lease-expense-details"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_VariableRateAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of variable rate.",
        "label": "Variable Rate [Axis]"
       }
      }
     },
     "localname": "VariableRateAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_VariableRateDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index.",
        "label": "Variable Rate [Domain]"
       }
      }
     },
     "localname": "VariableRateDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements",
      "http://www.cohu.com/20200627/role/statement-note-3-borrowings-and-credit-agreements-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_VestingAxis": {
     "auth_ref": [
      "r365"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by vesting schedule of award under share-based payment arrangement.",
        "label": "Vesting [Axis]"
       }
      }
     },
     "localname": "VestingAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_VestingDomain": {
     "auth_ref": [
      "r365"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Vesting schedule of award under share-based payment arrangement.",
        "label": "Vesting [Domain]"
       }
      }
     },
     "localname": "VestingDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans",
      "http://www.cohu.com/20200627/role/statement-note-6-employee-stock-benefit-plans-details-textual"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment": {
     "auth_ref": [
      "r166"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details": {
       "order": 1.0,
       "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.",
        "label": "Effect of dilutive securities (in shares)"
       }
      }
     },
     "localname": "WeightedAverageNumberDilutedSharesOutstandingAdjustment",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding": {
     "auth_ref": [
      "r160",
      "r166"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.",
        "label": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
        "terseLabel": "Diluted (in shares)",
        "totalLabel": "Weighted Average Number of Shares Outstanding, Diluted, Total"
       }
      }
     },
     "localname": "WeightedAverageNumberOfDilutedSharesOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Weighted average shares used in computing loss per share:"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesOutstandingAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic": {
     "auth_ref": [
      "r159",
      "r166"
     ],
     "calculation": {
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details": {
       "order": 0.0,
       "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.",
        "label": "Weighted average common shares (in shares)",
        "terseLabel": "Basic (in shares)"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesOutstandingBasic",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.cohu.com/20200627/role/statement-condensed-consolidated-statements-of-operations-unaudited",
      "http://www.cohu.com/20200627/role/statement-note-1-summary-of-significant-accounting-policies-computation-of-basic-and-diluted-income-loss-per-share-details"
     ],
     "xbrltype": "sharesItemType"
    }
   },
   "unitCount": 9
  }
 },
 "std_ref": {
  "r0": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=6359566&loc=d3e326-107755"
  },
  "r1": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=d3e1107-107759"
  },
  "r10": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760"
  },
  "r100": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(2)(a))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r101": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(2)(d))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r102": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(20))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r103": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(21))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r104": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(22))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r105": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(23))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r106": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(24))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r107": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(25))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r108": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(8))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r109": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(b)(2))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r11": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760"
  },
  "r110": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r111": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.13)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r112": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.4)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r113": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.7(a),(b))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r114": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585"
  },
  "r115": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585"
  },
  "r116": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585"
  },
  "r117": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585"
  },
  "r118": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585"
  },
  "r119": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585"
  },
  "r12": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1474-107760"
  },
  "r120": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585"
  },
  "r121": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585"
  },
  "r122": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3000-108585"
  },
  "r123": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "24",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585"
  },
  "r124": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585"
  },
  "r125": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585"
  },
  "r126": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585"
  },
  "r127": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585"
  },
  "r128": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585"
  },
  "r129": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585"
  },
  "r13": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721659-107760"
  },
  "r130": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586"
  },
  "r131": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586"
  },
  "r132": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586"
  },
  "r133": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586"
  },
  "r134": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121583591&loc=SL98516268-108586"
  },
  "r135": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790"
  },
  "r136": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790"
  },
  "r137": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790"
  },
  "r138": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(g)(1)(ii))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r139": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(h))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r14": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721663-107760"
  },
  "r140": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(h)(1)(i))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r141": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.12-04(a))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690"
  },
  "r142": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "235",
   "URI": "http://asc.fasb.org/topic&trid=2122369"
  },
  "r143": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "23",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=115929471&loc=d3e21914-107793"
  },
  "r144": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "24",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=115929471&loc=d3e21930-107793"
  },
  "r145": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=115929471&loc=d3e21711-107793"
  },
  "r146": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=115929471&loc=d3e21728-107793"
  },
  "r147": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(2)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r148": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(3)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r149": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(4)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r15": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721665-107760"
  },
  "r150": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r151": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794"
  },
  "r152": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794"
  },
  "r153": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794"
  },
  "r154": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22595-107794"
  },
  "r155": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794"
  },
  "r156": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794"
  },
  "r157": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22658-107794"
  },
  "r158": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794"
  },
  "r159": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=d3e1448-109256"
  },
  "r16": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721671-107760"
  },
  "r160": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=d3e1505-109256"
  },
  "r161": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=d3e1252-109256"
  },
  "r162": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=d3e1278-109256"
  },
  "r163": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "60B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256"
  },
  "r164": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "60B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256"
  },
  "r165": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=d3e1337-109256"
  },
  "r166": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
  },
  "r167": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
  },
  "r168": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257"
  },
  "r169": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=120380238&loc=d3e3842-109258"
  },
  "r17": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760"
  },
  "r170": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "52",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=120380238&loc=d3e4984-109258"
  },
  "r171": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "270",
   "URI": "http://asc.fasb.org/extlink&oid=116846552&loc=d3e543-108305"
  },
  "r172": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "272",
   "URI": "http://asc.fasb.org/extlink&oid=6828210&loc=d3e70191-108054"
  },
  "r173": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
  },
  "r174": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592"
  },
  "r175": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "18",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592"
  },
  "r176": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "18",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592"
  },
  "r177": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592"
  },
  "r178": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6442-108592"
  },
  "r179": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599"
  },
  "r18": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760"
  },
  "r180": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "18",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599"
  },
  "r181": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599"
  },
  "r182": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599"
  },
  "r183": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r184": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r185": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r186": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r187": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r188": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r189": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r19": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(1)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760"
  },
  "r190": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r191": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(j)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r192": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r193": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599"
  },
  "r194": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599"
  },
  "r195": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599"
  },
  "r196": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "26",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599"
  },
  "r197": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "29",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8864-108599"
  },
  "r198": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "29",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8864-108599"
  },
  "r199": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "29",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8864-108599"
  },
  "r2": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759"
  },
  "r20": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(e)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760"
  },
  "r200": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "29",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8864-108599"
  },
  "r201": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "29",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8864-108599"
  },
  "r202": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "29",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8864-108599"
  },
  "r203": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599"
  },
  "r204": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599"
  },
  "r205": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599"
  },
  "r206": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599"
  },
  "r207": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599"
  },
  "r208": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "31",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599"
  },
  "r209": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599"
  },
  "r21": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760"
  },
  "r210": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599"
  },
  "r211": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599"
  },
  "r212": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599"
  },
  "r213": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599"
  },
  "r214": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599"
  },
  "r215": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "34",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599"
  },
  "r216": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8475-108599"
  },
  "r217": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "40",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599"
  },
  "r218": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "41",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599"
  },
  "r219": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "41",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599"
  },
  "r22": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(2)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760"
  },
  "r220": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "41",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599"
  },
  "r221": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "42",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599"
  },
  "r222": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "280",
   "URI": "http://asc.fasb.org/topic&trid=2134510"
  },
  "r223": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 4.E)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707"
  },
  "r224": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563"
  },
  "r225": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563"
  },
  "r226": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563"
  },
  "r227": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563"
  },
  "r228": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "323",
   "URI": "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571"
  },
  "r229": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r23": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(2)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760"
  },
  "r230": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r231": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r232": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r233": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)(3)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r234": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)(4)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r235": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "330",
   "URI": "http://asc.fasb.org/extlink&oid=116847112&loc=d3e4492-108314"
  },
  "r236": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "330",
   "URI": "http://asc.fasb.org/extlink&oid=116847112&loc=d3e4556-108314"
  },
  "r237": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 5.BB)",
   "Topic": "330",
   "URI": "http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729"
  },
  "r238": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "330",
   "URI": "http://asc.fasb.org/topic&trid=2126998"
  },
  "r239": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "05",
   "SubTopic": "10",
   "Topic": "340",
   "URI": "http://asc.fasb.org/extlink&oid=68074540&loc=d3e5879-108316"
  },
  "r24": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760"
  },
  "r240": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "340",
   "URI": "http://asc.fasb.org/extlink&oid=6387103&loc=d3e6435-108320"
  },
  "r241": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266"
  },
  "r242": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266"
  },
  "r243": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975"
  },
  "r244": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(e)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267"
  },
  "r245": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(f)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267"
  },
  "r246": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267"
  },
  "r247": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267"
  },
  "r248": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=121556970&loc=SL108378252-109267"
  },
  "r249": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267"
  },
  "r25": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721677-107760"
  },
  "r250": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267"
  },
  "r251": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274"
  },
  "r252": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274"
  },
  "r253": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
  },
  "r254": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
  },
  "r255": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(d)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
  },
  "r256": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
  },
  "r257": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "((a)(1),(b))",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r258": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r259": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)(1)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r26": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760"
  },
  "r260": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)(2)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r261": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r262": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(d)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r263": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275"
  },
  "r264": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "350",
   "URI": "http://asc.fasb.org/topic&trid=2144416"
  },
  "r265": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "15",
   "SubTopic": "10",
   "Subparagraph": "(b)(2)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=121558832&loc=d3e400-110220"
  },
  "r266": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226348&loc=d3e2510-110228"
  },
  "r267": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226348&loc=d3e2473-110228"
  },
  "r268": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r269": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r27": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=26872618&loc=d3e7436-122677"
  },
  "r270": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r271": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
  },
  "r272": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
  },
  "r273": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
  },
  "r274": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
  },
  "r275": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=SL51724579-110230"
  },
  "r276": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "360",
   "URI": "http://asc.fasb.org/topic&trid=2155823"
  },
  "r277": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869"
  },
  "r278": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(2)",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869"
  },
  "r279": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869"
  },
  "r28": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/subtopic&trid=2122178"
  },
  "r280": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869"
  },
  "r281": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB TOPIC 5.P.3)",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747"
  },
  "r282": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 5.P.3)",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747"
  },
  "r283": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747"
  },
  "r284": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB TOPIC 5.P.4(b)(2))",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
  },
  "r285": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB TOPIC 5.P.4(b))",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
  },
  "r286": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB TOPIC 5.P.4)",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
  },
  "r287": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 5.P.4(b))",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
  },
  "r288": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 5.P.4(d))",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
  },
  "r289": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 5.P.4)",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
  },
  "r29": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765"
  },
  "r290": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "420",
   "URI": "http://asc.fasb.org/topic&trid=2175745"
  },
  "r291": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "440",
   "URI": "http://asc.fasb.org/topic&trid=2144648"
  },
  "r292": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349"
  },
  "r293": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14394-108349"
  },
  "r294": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/subtopic&trid=2127163"
  },
  "r295": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "30",
   "Topic": "450",
   "URI": "http://asc.fasb.org/subtopic&trid=2127197"
  },
  "r296": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "450",
   "URI": "http://asc.fasb.org/topic&trid=2127136"
  },
  "r297": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=68070138&loc=d3e11281-110244"
  },
  "r298": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=68068213&loc=d3e12524-110249"
  },
  "r299": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "((c)(2))",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249"
  },
  "r3": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=SL51721494-107759"
  },
  "r30": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765"
  },
  "r300": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "((c)(3))",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249"
  },
  "r301": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249"
  },
  "r302": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249"
  },
  "r303": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(5)",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249"
  },
  "r304": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249"
  },
  "r305": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "460",
   "URI": "http://asc.fasb.org/topic&trid=2155896"
  },
  "r306": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "10",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=28183603&loc=d3e692-112598"
  },
  "r307": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601"
  },
  "r308": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=6802200&loc=SL6230698-112601"
  },
  "r309": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(1)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870"
  },
  "r31": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765"
  },
  "r310": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(2)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870"
  },
  "r311": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(3)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870"
  },
  "r312": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "470",
   "URI": "http://asc.fasb.org/topic&trid=2208564"
  },
  "r313": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(3)",
   "Topic": "480",
   "URI": "http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764"
  },
  "r314": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644"
  },
  "r315": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.3-04)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770"
  },
  "r316": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044"
  },
  "r317": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044"
  },
  "r318": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045"
  },
  "r319": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045"
  },
  "r32": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765"
  },
  "r320": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045"
  },
  "r321": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045"
  },
  "r322": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121551570&loc=SL49130690-203046-203046"
  },
  "r323": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121551570&loc=SL49130690-203046-203046"
  },
  "r324": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121551570&loc=SL49130690-203046-203046"
  },
  "r325": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "10",
   "Topic": "712",
   "URI": "http://asc.fasb.org/extlink&oid=6410138&loc=d3e79691-111665"
  },
  "r326": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "10",
   "Topic": "712",
   "URI": "http://asc.fasb.org/extlink&oid=6410138&loc=d3e79708-111665"
  },
  "r327": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(i)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r328": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(ii)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r329": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(01)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r33": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6787-107765"
  },
  "r330": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r331": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)(A)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r332": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)(B)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r333": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)(C)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r334": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(03)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r335": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r336": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921"
  },
  "r337": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=6412939&loc=d3e15145-114933"
  },
  "r338": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "60",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963"
  },
  "r339": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "70",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942"
  },
  "r34": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6801-107765"
  },
  "r340": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(a)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947"
  },
  "r341": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=d3e29149-114947"
  },
  "r342": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(d)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947"
  },
  "r343": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(a)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450673-114947"
  },
  "r344": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "80",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948"
  },
  "r345": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121326096&loc=d3e4534-113899"
  },
  "r346": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901"
  },
  "r347": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901"
  },
  "r348": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901"
  },
  "r349": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r35": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765"
  },
  "r350": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r351": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a),(g)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r352": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b),(f)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r353": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(i)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r354": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(iii)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r355": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(iv)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r356": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(iv)(3)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r357": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)(i)-(ii)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r358": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)(iii)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r359": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)(iii)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r36": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6911-107765"
  },
  "r360": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r361": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r362": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r363": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)(1)(i)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r364": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(i)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r365": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901"
  },
  "r366": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r367": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r368": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r369": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r37": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6935-107765"
  },
  "r370": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r371": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(f)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r372": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(f)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r373": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(g)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r374": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 14.F)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809"
  },
  "r375": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120383193&loc=d3e11149-113907"
  },
  "r376": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=120383193&loc=d3e11178-113907"
  },
  "r377": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "718",
   "URI": "http://asc.fasb.org/topic&trid=2228938"
  },
  "r378": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "730",
   "URI": "http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373"
  },
  "r379": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=120406818&loc=d3e31917-109318"
  },
  "r38": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e7018-107765"
  },
  "r380": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=120406818&loc=d3e31931-109318"
  },
  "r381": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32672-109319"
  },
  "r382": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319"
  },
  "r383": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32705-109319"
  },
  "r384": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319"
  },
  "r385": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319"
  },
  "r386": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32857-109319"
  },
  "r387": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319"
  },
  "r388": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "740"
  },
  "r389": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "740"
  },
  "r39": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766"
  },
  "r390": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)(2)",
   "Topic": "740"
  },
  "r391": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)(3)",
   "Topic": "740"
  },
  "r392": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB TOPIC 6.I.5.Q1)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817"
  },
  "r393": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB TOPIC 6.I.7)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817"
  },
  "r394": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 6.I.7)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817"
  },
  "r395": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 6.I.Fact.1)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817"
  },
  "r396": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 6.I.Fact.2)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817"
  },
  "r397": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 11.C)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330215-122817"
  },
  "r398": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=120385591&loc=d3e38679-109324"
  },
  "r399": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=120385591&loc=d3e38679-109324"
  },
  "r4": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1D",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=SL51721503-107759"
  },
  "r40": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r400": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "270",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338"
  },
  "r401": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331"
  },
  "r402": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "740",
   "URI": "http://asc.fasb.org/topic&trid=2144680"
  },
  "r403": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "10",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460"
  },
  "r404": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=121598580&loc=d3e5263-128473"
  },
  "r405": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Subparagraph": "(e)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=121598580&loc=d3e5263-128473"
  },
  "r406": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=121598580&loc=d3e5333-128473"
  },
  "r407": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "38",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=121598580&loc=d3e5504-128473"
  },
  "r408": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683"
  },
  "r409": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683"
  },
  "r41": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(13))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r410": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "18",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4613673-111683"
  },
  "r411": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "19",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683"
  },
  "r412": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683"
  },
  "r413": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4613674-111683"
  },
  "r414": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988"
  },
  "r415": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988"
  },
  "r416": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r417": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(2)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r418": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r419": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(3)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r42": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(14))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r420": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c),(3)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r421": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bb)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685"
  },
  "r422": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685"
  },
  "r423": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4I",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=120409616&loc=SL4590271-111686"
  },
  "r424": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4J",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=120409616&loc=SL4591551-111686"
  },
  "r425": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4K",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=120409616&loc=SL4591552-111686"
  },
  "r426": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 5.E)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=120398118&loc=d3e355146-122828"
  },
  "r427": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959"
  },
  "r428": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959"
  },
  "r429": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r43": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(19))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r430": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r431": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)(1)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r432": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)(2)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r433": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r434": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258"
  },
  "r435": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "820",
   "URI": "http://asc.fasb.org/topic&trid=2155941"
  },
  "r436": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611"
  },
  "r437": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611"
  },
  "r438": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611"
  },
  "r439": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612"
  },
  "r44": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(20))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r440": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=120253306&loc=d3e28228-110885"
  },
  "r441": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "20",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=121605123&loc=d3e30226-110892"
  },
  "r442": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894"
  },
  "r443": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895"
  },
  "r444": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "230",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906"
  },
  "r445": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900"
  },
  "r446": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r447": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r448": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(c)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r449": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(d)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r45": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(22))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r450": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r451": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901"
  },
  "r452": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "830",
   "URI": "http://asc.fasb.org/topic&trid=2175825"
  },
  "r453": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391"
  },
  "r454": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399"
  },
  "r455": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399"
  },
  "r456": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400"
  },
  "r457": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121329987&loc=SL77916155-209984"
  },
  "r458": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977"
  },
  "r459": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977"
  },
  "r46": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(24))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r460": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977"
  },
  "r461": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977"
  },
  "r462": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977"
  },
  "r463": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977"
  },
  "r464": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918666-209980"
  },
  "r465": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(3)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980"
  },
  "r466": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r467": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r468": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r469": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r47": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(28))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r470": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(e)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r471": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(1)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r472": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(2)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r473": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(3)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r474": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(4)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r475": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r476": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980"
  },
  "r477": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "53",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971"
  },
  "r478": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r479": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r48": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(29))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r480": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r481": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r482": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r483": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r484": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r485": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r486": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r487": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "910",
   "URI": "http://asc.fasb.org/extlink&oid=119991564&loc=SL119991595-234733"
  },
  "r488": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 11.L)",
   "Topic": "924",
   "URI": "http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856"
  },
  "r489": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "926",
   "URI": "http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959"
  },
  "r49": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r490": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "926",
   "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079"
  },
  "r491": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "926",
   "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079"
  },
  "r492": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "926",
   "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079"
  },
  "r493": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "340",
   "Topic": "928",
   "URI": "http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004"
  },
  "r494": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(10)(1))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r495": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(11))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r496": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(13))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r497": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(15)(1))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r498": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(15)(5))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r499": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(16))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r5": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=d3e957-107759"
  },
  "r50": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r500": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(23))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r501": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.15(5))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r502": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(19))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r503": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(20))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r504": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(22))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r505": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(23))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r506": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(24))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r507": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(25))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r508": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(26))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r509": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(27))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r51": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(4))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r510": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.9)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r511": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "235",
   "Subparagraph": "(SX 210.9-05(b)(2))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884"
  },
  "r512": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120252992&loc=d3e62586-112803"
  },
  "r513": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(a)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803"
  },
  "r514": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803"
  },
  "r515": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "470",
   "Subparagraph": "(d)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
  },
  "r516": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "825",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788"
  },
  "r517": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(16))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r518": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(12))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r519": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(15)(5))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r52": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r520": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(15)(b)(1))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r521": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(16)(a)(2))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r522": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(16))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r523": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(23)(a)(3))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r524": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(23)(a)(4))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r525": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(25))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r526": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(8))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r527": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.16)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r528": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(11))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r529": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(12))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r53": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(31))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r530": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(18))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r531": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(19))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r532": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(20))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r533": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(21))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r534": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(22))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r535": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(23))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r536": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(9))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r537": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4H",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116884468&loc=SL65671331-158438"
  },
  "r538": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(d)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121643868&loc=SL117782755-158439"
  },
  "r539": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13H",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Subparagraph": "(a)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121639165&loc=SL117783719-158441"
  },
  "r54": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(32))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r540": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13H",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Subparagraph": "(b)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121639165&loc=SL117783719-158441"
  },
  "r541": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13H",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Subparagraph": "(c)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121639165&loc=SL117783719-158441"
  },
  "r542": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "29F",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121639165&loc=SL117819544-158441"
  },
  "r543": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(a)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r544": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(b)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r545": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(e)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r546": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(f)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r547": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(f)(2)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r548": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r549": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(i)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r55": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(a)(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r550": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(ii)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r551": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(iii)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r552": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(iv)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r553": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(h)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r554": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(h)(2)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r555": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(e)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121641442&loc=d3e19393-158473"
  },
  "r556": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "825",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195"
  },
  "r557": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 1))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r558": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 6))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r559": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 7))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r56": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(a)(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r560": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 1))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r561": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 6))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r562": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 7))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r563": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 1))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r564": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 6))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r565": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 7))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r566": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5D",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-13D(Column B)(Footnote 2))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=SL120429264-123010"
  },
  "r567": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5D",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-13D(Column C)(Footnote 2))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=SL120429264-123010"
  },
  "r568": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column A))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611379-123010"
  },
  "r569": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column B))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611379-123010"
  },
  "r57": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(a)(4))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r570": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column C))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611379-123010"
  },
  "r571": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column D))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611379-123010"
  },
  "r572": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "310",
   "Subparagraph": "(SX 210.12-29(Footnote 4))",
   "Topic": "948",
   "URI": "http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014"
  },
  "r573": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "360",
   "Subparagraph": "(d)",
   "Topic": "958",
   "URI": "http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916"
  },
  "r574": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "360",
   "Topic": "958",
   "URI": "http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916"
  },
  "r575": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column B))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r576": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column C))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r577": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column D))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r578": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column E))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r579": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column F))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r58": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(a)(5))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r580": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column G))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r581": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column H))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r582": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column I))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r583": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Footnote 2))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r584": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(1)",
   "Topic": "985",
   "URI": "http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756"
  },
  "r585": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "985",
   "URI": "http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756"
  },
  "r586": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "985",
   "URI": "http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756"
  },
  "r587": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b"
  },
  "r588": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "d1-1"
  },
  "r589": {
   "Name": "Form 10-Q",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-13"
  },
  "r59": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r590": {
   "Name": "Forms 10-K, 10-Q, 20-F",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-1-"
  },
  "r591": {
   "Name": "Regulation 12B",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r592": {
   "Name": "Regulation S-T",
   "Number": "232",
   "Publisher": "SEC",
   "Section": "405"
  },
  "r6": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=SL51721523-107759"
  },
  "r60": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r61": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(c))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r62": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.1)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r63": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.13(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r64": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.13)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r65": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.14)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r66": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.17)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r67": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(a)(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r68": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r69": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(b),22(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r7": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=SL51721525-107759"
  },
  "r70": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19,20)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r71": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19-26)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r72": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.20)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r73": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.21)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r74": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22(a)(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r75": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r76": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r77": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.24)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r78": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.29-31)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r79": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.6(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r8": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=d3e1012-107759"
  },
  "r80": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.6(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r81": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.8)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r82": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.9)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r83": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580"
  },
  "r84": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(i-k)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580"
  },
  "r85": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580"
  },
  "r86": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580"
  },
  "r87": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580"
  },
  "r88": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580"
  },
  "r89": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL34724394-108580"
  },
  "r9": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760"
  },
  "r90": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580"
  },
  "r91": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580"
  },
  "r92": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580"
  },
  "r93": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580"
  },
  "r94": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580"
  },
  "r95": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=d3e557-108580"
  },
  "r96": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121640130&loc=d3e1436-108581"
  },
  "r97": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(13))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868656-224227"
  },
  "r98": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(210.5-03(11))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r99": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(14))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  }
 },
 "version": "2.1"
}
