{
 "instance": {
  "ccmp-20200331.htm": {
   "axisCustom": 0,
   "axisStandard": 27,
   "contextCount": 230,
   "dts": {
    "calculationLink": {
     "local": [
      "ccmp-20200331_cal.xml"
     ]
    },
    "definitionLink": {
     "local": [
      "ccmp-20200331_def.xml"
     ],
     "remote": [
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-eedm-def-2019-01-31.xml",
      "http://xbrl.fasb.org/srt/2019/elts/srt-eedm1-def-2019-01-31.xml"
     ]
    },
    "inline": {
     "local": [
      "ccmp-20200331.htm"
     ]
    },
    "labelLink": {
     "local": [
      "ccmp-20200331_lab.xml"
     ],
     "remote": [
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-doc-2019-01-31.xml",
      "https://xbrl.sec.gov/dei/2019/dei-doc-2019-01-31.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "ccmp-20200331_pre.xml"
     ]
    },
    "referenceLink": {
     "remote": [
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-ref-2019-01-31.xml",
      "https://xbrl.sec.gov/dei/2019/dei-ref-2019-01-31.xml"
     ]
    },
    "schema": {
     "local": [
      "ccmp-20200331.xsd"
     ],
     "remote": [
      "http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.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/numeric-2009-12-16.xsd",
      "http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
      "http://xbrl.fasb.org/srt/2019/elts/srt-types-2019-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-roles-2019-01-31.xsd",
      "http://xbrl.fasb.org/srt/2019/elts/srt-roles-2019-01-31.xsd",
      "https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-types-2019-01-31.xsd",
      "https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/deprecated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-parts-codification-2019-01-31.xsd"
     ]
    }
   },
   "elementCount": 554,
   "entityCount": 1,
   "hidden": {
    "http://fasb.org/us-gaap/2019-01-31": 6,
    "http://xbrl.sec.gov/dei/2019-01-31": 5,
    "total": 11
   },
   "keyCustom": 22,
   "keyStandard": 376,
   "memberCustom": 23,
   "memberStandard": 42,
   "nsprefix": "ccmp",
   "nsuri": "http://www.cabotcmp.com/20200331",
   "report": {
    "R1": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "document",
     "isDefault": "true",
     "longName": "0001001 - Document - Cover Page",
     "role": "http://www.cabotcmp.com/role/CoverPage",
     "shortName": "Cover Page",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R10": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SignificantAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2103102 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS",
     "role": "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTS",
     "shortName": "SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SignificantAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R11": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueFromContractWithCustomerTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2106103 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS",
     "role": "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERS",
     "shortName": "REVENUE FROM CONTRACTS WITH CUSTOMERS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueFromContractWithCustomerTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R12": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BusinessCombinationDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2110104 - Disclosure - BUSINESS COMBINATION",
     "role": "http://www.cabotcmp.com/role/BUSINESSCOMBINATION",
     "shortName": "BUSINESS COMBINATION",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BusinessCombinationDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R13": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2117105 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS",
     "role": "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTS",
     "shortName": "FAIR VALUE OF FINANCIAL INSTRUMENTS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R14": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InventoryDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2120106 - Disclosure - INVENTORIES",
     "role": "http://www.cabotcmp.com/role/INVENTORIES",
     "shortName": "INVENTORIES",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InventoryDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R15": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2123107 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS",
     "role": "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETS",
     "shortName": "GOODWILL AND OTHER INTANGIBLE ASSETS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R16": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2129108 - Disclosure - OTHER LONG-TERM ASSETS",
     "role": "http://www.cabotcmp.com/role/OTHERLONGTERMASSETS",
     "shortName": "OTHER LONG-TERM ASSETS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R17": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2132109 - Disclosure - ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES",
     "role": "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIES",
     "shortName": "ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R18": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2135110 - Disclosure - DEBT",
     "role": "http://www.cabotcmp.com/role/DEBT",
     "shortName": "DEBT",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R19": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LesseeOperatingLeasesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2139111 - Disclosure - LEASES",
     "role": "http://www.cabotcmp.com/role/LEASES",
     "shortName": "LEASES",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LesseeOperatingLeasesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R2": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1001002 - Statement - CONSOLIDATED STATEMENTS OF INCOME",
     "role": "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME",
     "shortName": "CONSOLIDATED STATEMENTS OF INCOME",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:CostOfGoodsAndServicesSold",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R20": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2144112 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS",
     "role": "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTS",
     "shortName": "DERIVATIVE FINANCIAL INSTRUMENTS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R21": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2149113 - Disclosure - COMMITMENTS AND CONTINGENCIES",
     "role": "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIES",
     "shortName": "COMMITMENTS AND CONTINGENCIES",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R22": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ComprehensiveIncomeNoteTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2151114 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)",
     "role": "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS",
     "shortName": "ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ComprehensiveIncomeNoteTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R23": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2154115 - Disclosure - SHARE-BASED COMPENSATION PLANS",
     "role": "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANS",
     "shortName": "SHARE-BASED COMPENSATION PLANS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R24": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:IncomeTaxDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2158116 - Disclosure - INCOME TAXES",
     "role": "http://www.cabotcmp.com/role/INCOMETAXES",
     "shortName": "INCOME TAXES",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:IncomeTaxDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R25": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EarningsPerShareTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2160117 - Disclosure - EARNINGS PER SHARE",
     "role": "http://www.cabotcmp.com/role/EARNINGSPERSHARE",
     "shortName": "EARNINGS PER SHARE",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EarningsPerShareTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R26": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SegmentReportingDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2163118 - Disclosure - SEGMENT REPORTING",
     "role": "http://www.cabotcmp.com/role/SEGMENTREPORTING",
     "shortName": "SEGMENT REPORTING",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SegmentReportingDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R27": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:UseOfEstimates",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2204201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Policies)",
     "role": "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSPolicies",
     "shortName": "SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:UseOfEstimates",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R28": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2307301 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)",
     "role": "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSTables",
     "shortName": "REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R29": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2311302 - Disclosure - BUSINESS COMBINATION (Tables)",
     "role": "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONTables",
     "shortName": "BUSINESS COMBINATION (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R3": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:NetIncomeLoss",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1002003 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME",
     "role": "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME",
     "shortName": "CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:ComprehensiveIncomeNetOfTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R30": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2318303 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)",
     "role": "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSTables",
     "shortName": "FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R31": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2321304 - Disclosure - INVENTORIES (Tables)",
     "role": "http://www.cabotcmp.com/role/INVENTORIESTables",
     "shortName": "INVENTORIES (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R32": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfGoodwillTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2324305 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)",
     "role": "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSTables",
     "shortName": "GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfGoodwillTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R33": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfOtherAssetsNoncurrentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2330306 - Disclosure - OTHER LONG-TERM ASSETS (Tables)",
     "role": "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSTables",
     "shortName": "OTHER LONG-TERM ASSETS (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfOtherAssetsNoncurrentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R34": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2333307 - Disclosure - ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES (Tables)",
     "role": "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESTables",
     "shortName": "ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R35": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2336308 - Disclosure - DEBT (Tables)",
     "role": "http://www.cabotcmp.com/role/DEBTTables",
     "shortName": "DEBT (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R36": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2340309 - Disclosure - LEASES (Tables)",
     "role": "http://www.cabotcmp.com/role/LEASESTables",
     "shortName": "LEASES (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R37": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2345310 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS (Tables)",
     "role": "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSTables",
     "shortName": "DERIVATIVE FINANCIAL INSTRUMENTS (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R38": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2352311 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)",
     "role": "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables",
     "shortName": "ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R39": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2355312 - Disclosure - SHARE-BASED COMPENSATION PLANS (Tables)",
     "role": "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSTables",
     "shortName": "SHARE-BASED COMPENSATION PLANS (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R4": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1003004 - Statement - CONSOLIDATED BALANCE SHEETS",
     "role": "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS",
     "shortName": "CONSOLIDATED BALANCE SHEETS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R40": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2361313 - Disclosure - EARNINGS PER SHARE (Tables)",
     "role": "http://www.cabotcmp.com/role/EARNINGSPERSHARETables",
     "shortName": "EARNINGS PER SHARE (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R41": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2364314 - Disclosure - SEGMENT REPORTING (Tables)",
     "role": "http://www.cabotcmp.com/role/SEGMENTREPORTINGTables",
     "shortName": "SEGMENT REPORTING (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R42": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:NumberOfReportableSegments",
      "reportCount": 1,
      "unitRef": "segment",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2402401 - Disclosure - BACKGROUND AND BASIS OF PRESENTATION (Details)",
     "role": "http://www.cabotcmp.com/role/BACKGROUNDANDBASISOFPRESENTATIONDetails",
     "shortName": "BACKGROUND AND BASIS OF PRESENTATION (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R43": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeaseLiability",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2405402 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Details)",
     "role": "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails",
     "shortName": "SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i89ec2c96b8174a24be069c7dcc047d7f_I20191001",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:OperatingLeaseLiability",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R44": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ContractWithCustomerLiabilityCurrent",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2408403 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Reconciliation of Contract Balances (Details)",
     "role": "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSReconciliationofContractBalancesDetails",
     "shortName": "REVENUE FROM CONTRACTS WITH CUSTOMERS - Reconciliation of Contract Balances (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i2a60ef63e4af4fb58ea026d488b977f7_I20190930",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:ContractWithCustomerLiabilityNoncurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R45": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:RevenueRemainingPerformanceObligation",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2409404 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Transaction Price Allocated to Remaining Performance Obligations (Details)",
     "role": "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSTransactionPriceAllocatedtoRemainingPerformanceObligationsDetails",
     "shortName": "REVENUE FROM CONTRACTS WITH CUSTOMERS - Transaction Price Allocated to Remaining Performance Obligations (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:RevenueRemainingPerformanceObligation",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R46": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2412405 - Disclosure - BUSINESS COMBINATION - Narrative (Details)",
     "role": "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
     "shortName": "BUSINESS COMBINATION - Narrative (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ia8700dba3d244031aed339782654a6db_D20190701-20190930",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R47": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i8f1a4fbe00114c6596b8471c97fcd5bb_D20181115-20181115",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "ccmp:PaymentsToAcquireBusinessesGrossEquity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2413406 - Disclosure - BUSINESS COMBINATION - Consideration (Details)",
     "role": "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails",
     "shortName": "BUSINESS COMBINATION - Consideration (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i8f1a4fbe00114c6596b8471c97fcd5bb_D20181115-20181115",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "ccmp:PaymentsToAcquireBusinessesGrossEquity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R48": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfGoodwillTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:Goodwill",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2414407 - Disclosure - BUSINESS COMBINATION - Allocation of Fair Values of Assets Acquired and Liabilities Assumed (Details)",
     "role": "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails",
     "shortName": "BUSINESS COMBINATION - Allocation of Fair Values of Assets Acquired and Liabilities Assumed (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i91015645b50945559509369a52775a27_I20181115",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R49": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i91015645b50945559509369a52775a27_I20181115",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2415408 - Disclosure - BUSINESS COMBINATION - Identifiable Intangible Assets Acquired (Details)",
     "role": "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
     "shortName": "BUSINESS COMBINATION - Identifiable Intangible Assets Acquired (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i391b1bb08e03425aa246a7c909755794_I20181115",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R5": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1004005 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)",
     "role": "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETSParenthetical",
     "shortName": "CONSOLIDATED BALANCE SHEETS (Parenthetical)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R50": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:BusinessAcquisitionsProFormaRevenue",
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:BusinessAcquisitionProFormaInformationTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ibc06acdd34364157a97dba43a65ff6a6_D20190101-20190331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:BusinessAcquisitionsProFormaRevenue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2416409 - Disclosure - BUSINESS COMBINATION - Pro Forma Information (Details)",
     "role": "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONProFormaInformationDetails",
     "shortName": "BUSINESS COMBINATION - Pro Forma Information (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:BusinessAcquisitionsProFormaRevenue",
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:BusinessAcquisitionProFormaInformationTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ibc06acdd34364157a97dba43a65ff6a6_D20190101-20190331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:BusinessAcquisitionsProFormaRevenue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R51": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i3b9b451c3ae14e95bdf762cab3daabd6_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndCashEquivalentsFairValueDisclosure",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2419410 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details)",
     "role": "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails",
     "shortName": "FAIR VALUE OF FINANCIAL INSTRUMENTS (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i3b9b451c3ae14e95bdf762cab3daabd6_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndCashEquivalentsFairValueDisclosure",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R52": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:InventoryRawMaterialsNetOfReserves",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2422411 - Disclosure - INVENTORIES (Details)",
     "role": "http://www.cabotcmp.com/role/INVENTORIESDetails",
     "shortName": "INVENTORIES (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:InventoryRawMaterialsNetOfReserves",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R53": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfGoodwillTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i2a60ef63e4af4fb58ea026d488b977f7_I20190930",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:Goodwill",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2425412 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill Rollforward (Details)",
     "role": "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillRollforwardDetails",
     "shortName": "GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill Rollforward (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfGoodwillTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:GoodwillForeignCurrencyTranslationGainLoss",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R54": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FiniteLivedIntangibleAssetsGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2426413 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details)",
     "role": "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails",
     "shortName": "GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FiniteLivedIntangibleAssetsGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R55": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AmortizationOfIntangibleAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2427414 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details)",
     "role": "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails",
     "shortName": "GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AmortizationOfIntangibleAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R56": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2428415 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization Expense (Details)",
     "role": "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSAmortizationExpenseDetails",
     "shortName": "GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization Expense (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R57": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfOtherAssetsNoncurrentTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeaseRightOfUseAsset",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2431416 - Disclosure - OTHER LONG-TERM ASSETS (Details)",
     "role": "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails",
     "shortName": "OTHER LONG-TERM ASSETS (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfOtherAssetsNoncurrentTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:ContractWithCustomerAssetNetNoncurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R58": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:EmployeeRelatedLiabilitiesCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2434417 - Disclosure - ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES (Details)",
     "role": "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails",
     "shortName": "ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:EmployeeRelatedLiabilitiesCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R59": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LongTermDebtCurrent",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2437418 - Disclosure - DEBT - Narrative (Details)",
     "role": "http://www.cabotcmp.com/role/DEBTNarrativeDetails",
     "shortName": "DEBT - Narrative (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i8776080d93334d60b918b1c6812ff412_I20190331",
      "decimals": "INF",
      "lang": null,
      "name": "us-gaap:PercentageOfDebtHedgedByInterestRateDerivatives",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R6": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:NetIncomeLoss",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1005006 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS",
     "role": "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
     "shortName": "CONSOLIDATED STATEMENTS OF CASH FLOWS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:DepreciationDepletionAndAmortization",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R60": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "id198e3ccd8764ee799c8ad9b5f1b82b3_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2438419 - Disclosure - DEBT - Principal Repayments (Details)",
     "role": "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails",
     "shortName": "DEBT - Principal Repayments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "id198e3ccd8764ee799c8ad9b5f1b82b3_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R61": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "ix:continuation",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1",
      "reportCount": 1,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2441420 - Disclosure - LEASES - Narrative (Details)",
     "role": "http://www.cabotcmp.com/role/LEASESNarrativeDetails",
     "shortName": "LEASES - Narrative (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:LeaseCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R62": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2442421 - Disclosure - LEASES - Maturities of Operating Lease Liabilities (Details)",
     "role": "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails",
     "shortName": "LEASES - Maturities of Operating Lease Liabilities (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R63": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:OperatingLeasesOfLesseeDisclosureTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i2a60ef63e4af4fb58ea026d488b977f7_I20190930",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeasesFutureMinimumPaymentsDueCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2443422 - Disclosure - LEASES - Minimum Lease Payments Under Operating Leases (Details)",
     "role": "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails",
     "shortName": "LEASES - Minimum Lease Payments Under Operating Leases (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:OperatingLeasesOfLesseeDisclosureTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i2a60ef63e4af4fb58ea026d488b977f7_I20190930",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeasesFutureMinimumPaymentsDueCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R64": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimateOfTimeToTransfer1",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2446423 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)",
     "role": "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails",
     "shortName": "DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimateOfTimeToTransfer1",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R65": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i9fed32d0dbbe480b9be6d8ae42e44c4c_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeFairValueOfDerivativeAsset",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2447424 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value of Derivative Instruments in the Consolidated Balance Sheet (Details)",
     "role": "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails",
     "shortName": "DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value of Derivative Instruments in the Consolidated Balance Sheet (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i9fed32d0dbbe480b9be6d8ae42e44c4c_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeFairValueOfDerivativeAsset",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R66": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i66dbb68c5e024f2a84cbc2b72e6c9fcf_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeGainLossOnDerivativeNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2448425 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on the Consolidated Statement of Income (Details)",
     "role": "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails",
     "shortName": "DERIVATIVE FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on the Consolidated Statement of Income (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i66dbb68c5e024f2a84cbc2b72e6c9fcf_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeGainLossOnDerivativeNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R67": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "ccmp:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTenYears",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2450426 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)",
     "role": "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails",
     "shortName": "COMMITMENTS AND CONTINGENCIES (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i10f8fc4f34514106a55e422d334dcd19_I20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "ccmp:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTenYears",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R68": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i5cc5591520ec425db6c20082c6263e5d_I20191231",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:StockholdersEquity",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2453427 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details)",
     "role": "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails",
     "shortName": "ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": "-3",
      "lang": null,
      "name": "ccmp:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentIncludingStrandedTaxEffect",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R69": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:ShareBasedCompensation",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2456428 - Disclosure - SHARE-BASED COMPENSATION PLANS - Narrative (Details)",
     "role": "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSNarrativeDetails",
     "shortName": "SHARE-BASED COMPENSATION PLANS - Narrative (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i38789e842fa542759bd8b8e409189cc8_D20191001-20200331",
      "decimals": "INF",
      "lang": null,
      "name": "ccmp:ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardNumberOfVestingInstallment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "installment",
      "xsiNil": "false"
     }
    },
    "R7": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i4aca5de826454d9ca298f97afc73b08f_I20180930",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:StockholdersEquity",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1006007 - Statement - CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY",
     "role": "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY",
     "shortName": "CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "if66b522b7baa47979ec82e7c93e05484_D20181001-20181231",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R70": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AllocatedShareBasedCompensationExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2457429 - Disclosure - SHARE-BASED COMPENSATION PLANS - Share-Based Compensation Expense (Details)",
     "role": "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails",
     "shortName": "SHARE-BASED COMPENSATION PLANS - Share-Based Compensation Expense (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfShareBasedCompensationActivityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:AllocatedShareBasedCompensationExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R71": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "3",
      "first": true,
      "lang": null,
      "name": "us-gaap:EffectiveIncomeTaxRateContinuingOperations",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2459430 - Disclosure - INCOME TAXES (Details)",
     "role": "http://www.cabotcmp.com/role/INCOMETAXESDetails",
     "shortName": "INCOME TAXES (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "3",
      "first": true,
      "lang": null,
      "name": "us-gaap:EffectiveIncomeTaxRateContinuingOperations",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R72": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2462431 - Disclosure - EARNINGS PER SHARE (Details)",
     "role": "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails",
     "shortName": "EARNINGS PER SHARE (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R73": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i77420b2352b8433dbfb103f57688e485_D20181114-20181114",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:NumberOfOperatingSegments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "segment",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2465432 - Disclosure - SEGMENT REPORTING - Narrative (Details)",
     "role": "http://www.cabotcmp.com/role/SEGMENTREPORTINGNarrativeDetails",
     "shortName": "SEGMENT REPORTING - Narrative (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i77420b2352b8433dbfb103f57688e485_D20181114-20181114",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:NumberOfOperatingSegments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "segment",
      "xsiNil": "false"
     }
    },
    "R74": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2466433 - Disclosure - SEGMENT REPORTING - Revenue from External Customers (Details)",
     "role": "http://www.cabotcmp.com/role/SEGMENTREPORTINGRevenuefromExternalCustomersDetails",
     "shortName": "SEGMENT REPORTING - Revenue from External Customers (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i0327e53621d24d408aa333cec925b6b2_D20200101-20200331",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R75": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ccmp:CapitalExpendituresBySegmentTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:PaymentsToAcquireProductiveAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2467434 - Disclosure - SEGMENT REPORTING - Capital Expenditures (Details)",
     "role": "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails",
     "shortName": "SEGMENT REPORTING - Capital Expenditures (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ccmp:CapitalExpendituresBySegmentTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:PaymentsToAcquireProductiveAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R76": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:InterestExpense",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2468435 - Disclosure - SEGMENT REPORTING - Reconciliation from Segment Adjusted EBITDA (Details)",
     "role": "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails",
     "shortName": "SEGMENT REPORTING - Reconciliation from Segment Adjusted EBITDA (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ccmp:SegmentAdjustedEBITDATableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "-3",
      "lang": null,
      "name": "us-gaap:DepreciationAndAmortization",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R8": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:CommonStockDividendsPerShareDeclared",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usdPerShare",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1007008 - Statement - CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical)",
     "role": "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITYParenthetical",
     "shortName": "CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ieb4f13f6f8c24b4097884205ae0ec8f5_D20200101-20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:CommonStockDividendsPerShareDeclared",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usdPerShare",
      "xsiNil": "false"
     }
    },
    "R9": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BusinessDescriptionAndBasisOfPresentationTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2101101 - Disclosure - BACKGROUND AND BASIS OF PRESENTATION",
     "role": "http://www.cabotcmp.com/role/BACKGROUNDANDBASISOFPRESENTATION",
     "shortName": "BACKGROUND AND BASIS OF PRESENTATION",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "i71a2f60004e54c3a9e49baaa489db409_D20191001-20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BusinessDescriptionAndBasisOfPresentationTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R9999": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ccmp-20200331.htm",
      "contextRef": "ib44778f7fbba48c889c77e8f2061b119_I20181001",
      "decimals": "-3",
      "first": true,
      "lang": null,
      "name": "us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "",
     "isDefault": "false",
     "longName": "Uncategorized Items - ccmp-20200331.htm",
     "role": "http://xbrl.sec.gov/role/uncategorizedFacts",
     "shortName": "Uncategorized Items - ccmp-20200331.htm",
     "subGroupType": "",
     "uniqueAnchor": null
    }
   },
   "segmentCount": 65,
   "tag": {
    "ccmp_AbrasiveParticleSupplyAgreementMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Abrasive Particle Supply Agreement",
        "label": "Abrasive Particle Supply Agreement [Member]",
        "terseLabel": "Abrasive particle supply agreement"
       }
      }
     },
     "localname": "AbrasiveParticleSupplyAgreementMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_AbrasiveParticlesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Abrasive Particles",
        "label": "Abrasive Particles [Member]",
        "terseLabel": "Abrasive particles"
       }
      }
     },
     "localname": "AbrasiveParticlesMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_AccruedExpensesIncomeTaxesPayableAndOtherCurrentLiabilitiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accrued Expenses, Income Taxes Payable, And Other Current Liabilities",
        "label": "Accrued Expenses, Income Taxes Payable, And Other Current Liabilities [Member]",
        "terseLabel": "Accrued expenses, income taxes payable and other current liabilities"
       }
      }
     },
     "localname": "AccruedExpensesIncomeTaxesPayableAndOtherCurrentLiabilitiesMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_AcquiredPatentsAndLicensesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Exclusive legal right granted by the government to the owner of the acquired patents and licenses to exploit an invention or a process for a period of time specified by law.",
        "label": "Acquired Patents and Licenses [Member]",
        "terseLabel": "Acquired patents and licenses"
       }
      }
     },
     "localname": "AcquiredPatentsAndLicensesMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails": {
       "order": 1.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Adjusted Earnings Before Interest, Taxes, Depreciation And Amortization",
        "label": "Adjusted Earnings Before Interest, Taxes, Depreciation And Amortization",
        "terseLabel": "Adjusted EBITDA"
       }
      }
     },
     "localname": "AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ccmp_BusinessAcquisitionSharePercentage": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of a single share of a number of saleable stocks paid or offered to be paid in a business combination.",
        "label": "Business Acquisition Share Percentage",
        "terseLabel": "Share percentage received for each share of KMG common stock (in shares)"
       }
      }
     },
     "localname": "BusinessAcquisitionSharePercentage",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "pureItemType"
    },
    "ccmp_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuablePerShare": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of equity interests per share of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.",
        "label": "Business Combination Consideration Transferred Equity Interests Issued And Issuable per share",
        "terseLabel": "Amount received for each share of KMG common stock (in dollars per share)"
       }
      }
     },
     "localname": "BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuablePerShare",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "ccmp_CapitalExpendituresBySegmentTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Capital Expenditures By Segment",
        "label": "Capital Expenditures By Segment [Table Text Block]",
        "terseLabel": "Schedule of capital expenditures by segment"
       }
      }
     },
     "localname": "CapitalExpendituresBySegmentTableTextBlock",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ccmp_ChargesRelatedToCOVID19": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Charges Related To COVID-19",
        "label": "Charges Related To COVID-19",
        "negatedLabel": "Costs related to the Pandemic"
       }
      }
     },
     "localname": "ChargesRelatedToCOVID19",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ccmp_CreditAgreementMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Credit Agreement among the Company, as Borrower, Bank of America, N.A., as administrative agent, swing line lender and an L/C issuer, Bank of America Merrill Lynch and J.P. Morgan Securities LLC, as joint lead arrangers and joint book managers, JPMorgan Chase Bank, N.A., as syndication agent, and Wells Fargo Bank, N.A. as documentation agent. The Credit Agreement provided for a Term Loan and a Revolving Credit Facility.",
        "label": "Credit Agreement [Member]",
        "terseLabel": "Credit Agreement"
       }
      }
     },
     "localname": "CreditAgreementMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_CustomerRelationshipsElectronicChemicalsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Customer Relationships, Electronic Chemicals",
        "label": "Customer Relationships, Electronic Chemicals [Member]",
        "terseLabel": "Customer relationships - Electronic chemicals"
       }
      }
     },
     "localname": "CustomerRelationshipsElectronicChemicalsMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_CustomerRelationshipsFlowchemMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Customer Relationships, Flowchem",
        "label": "Customer Relationships, Flowchem [Member]",
        "terseLabel": "Customer relationships - Flowchem"
       }
      }
     },
     "localname": "CustomerRelationshipsFlowchemMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_CustomerRelationshipsOtherMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Customer Relationships, Other",
        "label": "Customer Relationships, Other [Member]",
        "terseLabel": "Customer relationships - all other"
       }
      }
     },
     "localname": "CustomerRelationshipsOtherMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_DebtInstrumentCovenantComplianceNetLeverageRatio": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represent the first lien secured net leverage ratio require to maintain under the new revolving facility dated on November 1, 2018.",
        "label": "Debt Instrument, Covenant Compliance, Net Leverage Ratio",
        "terseLabel": "Secured net leverage ratio"
       }
      }
     },
     "localname": "DebtInstrumentCovenantComplianceNetLeverageRatio",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "pureItemType"
    },
    "ccmp_DebtInstrumentCovenantTermsExcessCashFlow": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt Instrument, Covenant Terms, Excess Cash Flow",
        "label": "Debt Instrument, Covenant Terms, Excess Cash Flow",
        "terseLabel": "Debt requirements, annual excess cash flow"
       }
      }
     },
     "localname": "DebtInstrumentCovenantTermsExcessCashFlow",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ccmp_DebtInstrumentCovenantTermsNetCashProceeds": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt Instrument, Covenant Terms, Net Cash Proceeds",
        "label": "Debt Instrument, Covenant Terms, Net Cash Proceeds",
        "terseLabel": "Debt requirements, net cash proceeds of recovery events and non-ordinary course asset sales"
       }
      }
     },
     "localname": "DebtInstrumentCovenantTermsNetCashProceeds",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ccmp_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTenYears": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of benefits for defined benefit plan expected to be paid over the next 10 fiscal years.",
        "label": "Defined Benefit Plan Expected Future Benefit Payments Next Ten Years",
        "terseLabel": "Expected future benefit payments"
       }
      }
     },
     "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTenYears",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ccmp_DerivativeInstrumentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Derivative Instruments [Abstract]",
        "terseLabel": "Derivative Instruments [Abstract]"
       }
      }
     },
     "localname": "DerivativeInstrumentsAbstract",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ccmp_DistributionRightsCustomerRelationshipsAndOtherMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Distribution rights, customer relationship and other that exists between an entity and its customer, for example, but not limited to, tenant relationships. Legal rights, generally of a limited duration, to distribute a product or products, often within specific geographic areas or supply channels.",
        "label": "Distribution Rights, Customer relationships, and Other [Member]",
        "terseLabel": "Customer relationships, trade names, and distribution rights"
       }
      }
     },
     "localname": "DistributionRightsCustomerRelationshipsAndOtherMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_EarningsBeforeInterestTaxesDepreciationAndAmortizationForUnallocatedCorporateExpenses": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails": {
       "order": 2.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Earnings Before Interest, Taxes, Depreciation and Amortization, Unallocated Corporate Expenses",
        "label": "Earnings Before Interest, Taxes, Depreciation and Amortization for Unallocated Corporate Expenses",
        "negatedLabel": "Unallocated corporate expenses"
       }
      }
     },
     "localname": "EarningsBeforeInterestTaxesDepreciationAndAmortizationForUnallocatedCorporateExpenses",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ccmp_ElectronicMaterialsCMPPadsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Electronic Materials, CMP Pads",
        "label": "Electronic Materials, CMP Pads [Member]",
        "terseLabel": "CMP Pads"
       }
      }
     },
     "localname": "ElectronicMaterialsCMPPadsMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGRevenuefromExternalCustomersDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_ElectronicMaterialsCMPSlurriesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Electronic Materials, CMP Slurries",
        "label": "Electronic Materials, CMP Slurries [Member]",
        "terseLabel": "CMP Slurries"
       }
      }
     },
     "localname": "ElectronicMaterialsCMPSlurriesMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGRevenuefromExternalCustomersDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_ElectronicMaterialsElectronicChemicalsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Electronic Materials, Electronic Chemicals",
        "label": "Electronic Materials, Electronic Chemicals [Member]",
        "terseLabel": "Electronic Chemicals"
       }
      }
     },
     "localname": "ElectronicMaterialsElectronicChemicalsMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGRevenuefromExternalCustomersDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_ElectronicMaterialsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Refers to the operating segment that deals with electronic materials activities of the entity.",
        "label": "Electronic Materials [Member]",
        "terseLabel": "Electronic Materials"
       }
      }
     },
     "localname": "ElectronicMaterialsMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillRollforwardDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGRevenuefromExternalCustomersDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_EnvironmentalExitCostsNumberOfOtherPartiesInAgreement": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Environmental Exit Costs, Number Of Other Parties In Agreement",
        "label": "Environmental Exit Costs, Number Of Other Parties In Agreement",
        "terseLabel": "Number of other parties in agreement"
       }
      }
     },
     "localname": "EnvironmentalExitCostsNumberOfOtherPartiesInAgreement",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "ccmp_GoodsAndServicesReceivedNotYetInvoiced": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": 8.0,
       "parentTag": "us-gaap_OtherLiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of good and services received, but not invoiced by the vendor as of the balance sheet date.",
        "label": "Goods And Services Received Not Yet Invoiced",
        "verboseLabel": "Goods and services received, not yet invoiced"
       }
      }
     },
     "localname": "GoodsAndServicesReceivedNotYetInvoiced",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ccmp_JPMorganChaseBankNAMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "JPMorgan Chase Bank, N.A",
        "label": "JPMorgan Chase Bank, N.A [Member]",
        "terseLabel": "JPMorgan Chase Bank, N.A."
       }
      }
     },
     "localname": "JPMorganChaseBankNAMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_KMGBernuthMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "KMG-Bernuth [Member]",
        "label": "KMG-Bernuth [Member]",
        "terseLabel": "KMG-Bernuth"
       }
      }
     },
     "localname": "KMGBernuthMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_KMGMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the aggregation and reporting of combined amounts of individually immaterial business combinations that were completed during the period.",
        "label": "KMG [Member]",
        "terseLabel": "KMG"
       }
      }
     },
     "localname": "KMGMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONProFormaInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_LIBORFloorMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "LIBOR Floor [Member]",
        "label": "LIBOR Floor [Member]",
        "terseLabel": "LIBOR Floor"
       }
      }
     },
     "localname": "LIBORFloorMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_NonWaterBasedCarrierFluidMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Non-Water Based Carrier Fluid",
        "label": "Non-Water Based Carrier Fluid [Member]",
        "terseLabel": "Non-water-based carrier fluid"
       }
      }
     },
     "localname": "NonWaterBasedCarrierFluidMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentIncludingStrandedTaxEffect": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Including Stranded Tax Effect",
        "label": "Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Including Stranded Tax Effect",
        "terseLabel": "Other comprehensive income, net of tax, including stranded tax effect"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentIncludingStrandedTaxEffect",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ccmp_PaymentsToAcquireBusinessesGrossDebt": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_PaymentsToAcquireBusinessesGross",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Payments to Acquire Businesses, Gross, Debt",
        "label": "Payments to Acquire Businesses, Gross, Debt",
        "terseLabel": "Cash provided to payoff KMG debt"
       }
      }
     },
     "localname": "PaymentsToAcquireBusinessesGrossDebt",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ccmp_PaymentsToAcquireBusinessesGrossEquity": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_PaymentsToAcquireBusinessesGross",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Payments to Acquire Businesses, Gross, Equity",
        "label": "Payments to Acquire Businesses, Gross, Equity",
        "terseLabel": "Total cash consideration paid for KMG outstanding common stock and equity awards"
       }
      }
     },
     "localname": "PaymentsToAcquireBusinessesGrossEquity",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ccmp_PercentageOfAccelerateVestAwardsToNumberOfShares": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of accelerate in vest of awards to number of shares upon termination.",
        "label": "Percentage of Accelerate Vest Awards to Number of Shares",
        "terseLabel": "Percentage of Accelerate Vest Awards to Number of Shares"
       }
      }
     },
     "localname": "PercentageOfAccelerateVestAwardsToNumberOfShares",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ccmp_PercentageOfInitialPrincipalPaymentAmount": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percent of initial principal payment amount due",
        "label": "Percentage of initial principal payment amount",
        "terseLabel": "Percentage of initial principal payment amount"
       }
      }
     },
     "localname": "PercentageOfInitialPrincipalPaymentAmount",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ccmp_PerformanceMaterialsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Refers to the operating segment that deals with performance materials activities of the entity.",
        "label": "Performance Materials [Member]",
        "verboseLabel": "Performance Materials"
       }
      }
     },
     "localname": "PerformanceMaterialsMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillRollforwardDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGRevenuefromExternalCustomersDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_PeriodOfTerminationToAccelerateVestAwardsToShares": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period, If the recipient is terminated without cause or resigns with good reason for award will accelerate vest in a number of shares.",
        "label": "Period of Termination to Accelerate Vest Awards to Shares",
        "terseLabel": "Period of Termination to Accelerate Vest Awards to Shares"
       }
      }
     },
     "localname": "PeriodOfTerminationToAccelerateVestAwardsToShares",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSNarrativeDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "ccmp_ProductTechnologyMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Capitalization of technology either developed or purchased for/about certain company products and/or product manufacturing processes, and Information generally known to only a limited number of the entity's employees, such as a formula, pattern, machine, technology, and production process that may give an entity a competitive advantage.",
        "label": "Product Technology, Trade Secrets and Know-How [Member]",
        "terseLabel": "Product technology, trade secrets and know-how"
       }
      }
     },
     "localname": "ProductTechnologyMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_RepurchasesOfCommonStockOtherAtCost": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Equity impact of the cost of common stock repurchased as shares withheld from award recipients to cover payroll taxes on the vesting of shares of restricted stock granted under equity incentive plans.",
        "label": "Repurchases of common stock - other, at cost",
        "negatedTerseLabel": "Repurchases of common stock - other, at cost"
       }
      }
     },
     "localname": "RepurchasesOfCommonStockOtherAtCost",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ccmp_SegmentAdjustedEBITDATableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of earnings before interest, taxes. depreciation and amortization.",
        "label": "Segment Adjusted EBITDA [Table Text Block]",
        "terseLabel": "Schedule of segment adjusted EBITDA"
       }
      }
     },
     "localname": "SegmentAdjustedEBITDATableTextBlock",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ccmp_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardNumberOfVestingInstallment": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of vesting installments for awards to be vested from grant date.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Award Number of Vesting Installment",
        "terseLabel": "Number of vesting installments"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardNumberOfVestingInstallment",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSNarrativeDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "ccmp_ShortTermLeaseAndVariableLeaseCost": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESNarrativeDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Short-term Lease And Variable Lease, Cost",
        "label": "Short-term Lease And Variable Lease, Cost",
        "terseLabel": "Short-term and variable lease costs"
       }
      }
     },
     "localname": "ShortTermLeaseAndVariableLeaseCost",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ccmp_StockOptionAndRestrictedStockMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "An arrangement whereby an employee is entitled to receive in the future, subject to vesting and other restrictions, a number of shares in the entity at a specified price, as defined in the agreement and stock including a provision that prohibits sale or substantive sale of an equity instrument for a specified period of time or until specified performance conditions are met.. Although there are variations, normally, after vesting, when an option is exercised, the employee-holder pays the strike value in cash to the issuing employer-entity and receives equity shares. The equity shares can be sold into the market for cash at the current market price without restriction.",
        "label": "Stock Option and Restricted Stock [Member]",
        "terseLabel": "Stock Option and Restricted Stock"
       }
      }
     },
     "localname": "StockOptionAndRestrictedStockMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_TradeNameFlowchemMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Trade Name, Flowchem [Member]",
        "label": "Trade Name, Flowchem [Member]",
        "terseLabel": "Trade name - Flowchem"
       }
      }
     },
     "localname": "TradeNameFlowchemMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ccmp_TradeNamesOtherMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rights acquired through registration of a business name to gain or protect exclusive use thereof classified as other.",
        "label": "Trade Names, Other [Member]",
        "terseLabel": "Trade name - all other"
       }
      }
     },
     "localname": "TradeNamesOtherMember",
     "nsuri": "http://www.cabotcmp.com/20200331",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "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",
        "terseLabel": "Amendment Flag"
       }
      }
     },
     "localname": "AmendmentFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_CityAreaCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Area code of city",
        "label": "City Area Code",
        "terseLabel": "City Area Code"
       }
      }
     },
     "localname": "CityAreaCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_CoverAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cover page.",
        "label": "Cover [Abstract]",
        "terseLabel": "Cover page."
       }
      }
     },
     "localname": "CoverAbstract",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "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",
        "terseLabel": "Current Fiscal Year End Date"
       }
      }
     },
     "localname": "CurrentFiscalYearEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "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",
        "terseLabel": "Document Fiscal Period Focus"
       }
      }
     },
     "localname": "DocumentFiscalPeriodFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "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",
        "terseLabel": "Document Fiscal Year Focus"
       }
      }
     },
     "localname": "DocumentFiscalYearFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "gYearItemType"
    },
    "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",
        "terseLabel": "Document Period End Date"
       }
      }
     },
     "localname": "DocumentPeriodEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "dateItemType"
    },
    "dei_DocumentQuarterlyReport": {
     "auth_ref": [
      "r376"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as an quarterly report.",
        "label": "Document Quarterly Report",
        "terseLabel": "Document Quarterly Report"
       }
      }
     },
     "localname": "DocumentQuarterlyReport",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentTransitionReport": {
     "auth_ref": [
      "r377"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as a transition report.",
        "label": "Document Transition Report",
        "terseLabel": "Document Transition Report"
       }
      }
     },
     "localname": "DocumentTransitionReport",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "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",
        "terseLabel": "Document Type"
       }
      }
     },
     "localname": "DocumentType",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "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",
        "terseLabel": "Entity Address, Address Line One"
       }
      }
     },
     "localname": "EntityAddressAddressLine1",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressCityOrTown": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the City or Town",
        "label": "Entity Address, City or Town",
        "terseLabel": "Entity Address, City or Town"
       }
      }
     },
     "localname": "EntityAddressCityOrTown",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressPostalZipCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Code for the postal or zip code",
        "label": "Entity Address, Postal Zip Code",
        "terseLabel": "Entity Address, Postal Zip Code"
       }
      }
     },
     "localname": "EntityAddressPostalZipCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressStateOrProvince": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the state or province.",
        "label": "Entity Address, State or Province",
        "terseLabel": "Entity Address, State or Province"
       }
      }
     },
     "localname": "EntityAddressStateOrProvince",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "stateOrProvinceItemType"
    },
    "dei_EntityCentralIndexKey": {
     "auth_ref": [
      "r378"
     ],
     "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",
        "terseLabel": "Entity Central Index Key"
       }
      }
     },
     "localname": "EntityCentralIndexKey",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "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",
        "terseLabel": "Entity Common Stock, Shares Outstanding"
       }
      }
     },
     "localname": "EntityCommonStockSharesOutstanding",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "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",
        "terseLabel": "Entity Current Reporting Status"
       }
      }
     },
     "localname": "EntityCurrentReportingStatus",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityEmergingGrowthCompany": {
     "auth_ref": [
      "r378"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate if registrant meets the emerging growth company criteria.",
        "label": "Entity Emerging Growth Company",
        "terseLabel": "Entity Emerging Growth Company"
       }
      }
     },
     "localname": "EntityEmergingGrowthCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "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",
        "terseLabel": "Entity File Number"
       }
      }
     },
     "localname": "EntityFileNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "fileNumberItemType"
    },
    "dei_EntityFilerCategory": {
     "auth_ref": [
      "r378"
     ],
     "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",
        "terseLabel": "Entity Filer Category"
       }
      }
     },
     "localname": "EntityFilerCategory",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "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",
        "terseLabel": "Entity Incorporation, State or Country Code"
       }
      }
     },
     "localname": "EntityIncorporationStateCountryCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "edgarStateCountryItemType"
    },
    "dei_EntityInteractiveDataCurrent": {
     "auth_ref": [
      "r379"
     ],
     "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",
        "terseLabel": "Entity Interactive Data Current"
       }
      }
     },
     "localname": "EntityInteractiveDataCurrent",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityRegistrantName": {
     "auth_ref": [
      "r378"
     ],
     "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",
        "terseLabel": "Entity Registrant Name"
       }
      }
     },
     "localname": "EntityRegistrantName",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityShellCompany": {
     "auth_ref": [
      "r378"
     ],
     "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",
        "terseLabel": "Entity Shell Company"
       }
      }
     },
     "localname": "EntityShellCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntitySmallBusiness": {
     "auth_ref": [
      "r378"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicates that the company is a Smaller Reporting Company (SRC).",
        "label": "Entity Small Business",
        "terseLabel": "Entity Small Business"
       }
      }
     },
     "localname": "EntitySmallBusiness",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityTaxIdentificationNumber": {
     "auth_ref": [
      "r378"
     ],
     "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",
        "terseLabel": "Entity Tax Identification Number"
       }
      }
     },
     "localname": "EntityTaxIdentificationNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "employerIdItemType"
    },
    "dei_LocalPhoneNumber": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Local phone number for entity.",
        "label": "Local Phone Number",
        "terseLabel": "Local Phone Number"
       }
      }
     },
     "localname": "LocalPhoneNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_Security12bTitle": {
     "auth_ref": [
      "r374"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Title of a 12(b) registered security.",
        "label": "Title of 12(b) Security",
        "terseLabel": "Title of 12(b) Security"
       }
      }
     },
     "localname": "Security12bTitle",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "securityTitleItemType"
    },
    "dei_SecurityExchangeName": {
     "auth_ref": [
      "r375"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the Exchange on which a security is registered.",
        "label": "Security Exchange Name",
        "terseLabel": "Security Exchange Name"
       }
      }
     },
     "localname": "SecurityExchangeName",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "edgarExchangeCodeItemType"
    },
    "dei_TradingSymbol": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Trading symbol of an instrument as listed on an exchange.",
        "label": "Trading Symbol",
        "terseLabel": "Trading Symbol"
       }
      }
     },
     "localname": "TradingSymbol",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CoverPage"
     ],
     "xbrltype": "tradingSymbolItemType"
    },
    "srt_ConsolidationItemsAxis": {
     "auth_ref": [
      "r139",
      "r147"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Consolidation Items [Axis]",
        "terseLabel": "Consolidation Items [Axis]"
       }
      }
     },
     "localname": "ConsolidationItemsAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_ConsolidationItemsDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Consolidation Items [Domain]",
        "terseLabel": "Consolidation Items [Domain]"
       }
      }
     },
     "localname": "ConsolidationItemsDomain",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MaximumMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Maximum [Member]",
        "terseLabel": "Maximum"
       }
      }
     },
     "localname": "MaximumMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MinimumMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Minimum [Member]",
        "terseLabel": "Minimum"
       }
      }
     },
     "localname": "MinimumMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_RangeAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statistical Measurement [Axis]",
        "terseLabel": "Statistical Measurement [Axis]"
       }
      }
     },
     "localname": "RangeAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_RangeMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statistical Measurement [Domain]",
        "terseLabel": "Statistical Measurement [Domain]"
       }
      }
     },
     "localname": "RangeMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AOCIAttributableToParentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "AOCI Attributable to Parent [Abstract]",
        "terseLabel": "AOCI Attributable to Parent [Abstract]"
       }
      }
     },
     "localname": "AOCIAttributableToParentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AOCIAttributableToParentNetOfTaxRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "AOCI Attributable to Parent, Net of Tax [Roll Forward]",
        "terseLabel": "AOCI Attributable to Parent, Net of Tax [Roll Forward]"
       }
      }
     },
     "localname": "AOCIAttributableToParentNetOfTaxRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountingPoliciesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Accounting Policies [Abstract]",
        "terseLabel": "Accounting Policies [Abstract]"
       }
      }
     },
     "localname": "AccountingPoliciesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountingStandardsUpdate201602Member": {
     "auth_ref": [
      "r329"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accounting Standards Update 2016-02 Leases (Topic 842).",
        "label": "Accounting Standards Update 2016-02 [Member]",
        "terseLabel": "Accounting Standards Update 2016-02"
       }
      }
     },
     "localname": "AccountingStandardsUpdate201602Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccountingStandardsUpdate201802Member": {
     "auth_ref": [
      "r74"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accounting Standards Update 2018-02 Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.",
        "label": "Accounting Standards Update 2018-02 [Member]",
        "terseLabel": "Accounting Standards Update 2018-02 [Member]"
       }
      }
     },
     "localname": "AccountingStandardsUpdate201802Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock": {
     "auth_ref": [
      "r38"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period.",
        "label": "Accounts Payable and Accrued Liabilities Disclosure [Text Block]",
        "verboseLabel": "ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES"
       }
      }
     },
     "localname": "AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIES"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_AccountsPayableCurrent": {
     "auth_ref": [
      "r37"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "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, Current",
        "verboseLabel": "Accounts payable"
       }
      }
     },
     "localname": "AccountsPayableCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccountsReceivableNetCurrent": {
     "auth_ref": [
      "r4",
      "r20",
      "r151",
      "r152",
      "r222"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.",
        "label": "Accounts Receivable, after Allowance for Credit Loss, Current",
        "terseLabel": "Accounts receivable, less allowance for doubtful accounts of $2,718 at March\u00a031, 2020 and $2,377 at September\u00a030, 2019"
       }
      }
     },
     "localname": "AccountsReceivableNetCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent": {
     "auth_ref": [
      "r9",
      "r42",
      "r244"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_OtherLiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
        "label": "Accrual for Taxes Other than Income Taxes, Current",
        "terseLabel": "Taxes, other than income taxes"
       }
      }
     },
     "localname": "AccrualForTaxesOtherThanIncomeTaxesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccruedIncomeTaxesCurrent": {
     "auth_ref": [
      "r16",
      "r351",
      "r362"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_OtherLiabilitiesCurrent",
       "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": "Accrued Income Taxes, Current",
        "terseLabel": "Income taxes payable"
       }
      }
     },
     "localname": "AccruedIncomeTaxesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember": {
     "auth_ref": [
      "r57",
      "r64",
      "r66",
      "r227",
      "r279"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated other comprehensive (income) loss related to defined benefit plans attributable to the parent.",
        "label": "Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]",
        "terseLabel": "Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]"
       }
      }
     },
     "localname": "AccumulatedDefinedBenefitPlansAdjustmentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember": {
     "auth_ref": [
      "r64",
      "r73",
      "r278"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated other comprehensive income (loss) from gain (loss) of derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent.",
        "label": "Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]",
        "verboseLabel": "Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]"
       }
      }
     },
     "localname": "AccumulatedGainLossNetCashFlowHedgeParentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems": {
     "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": "Accumulated Other Comprehensive Income (Loss) [Line Items]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss) [Line Items]"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": {
     "auth_ref": [
      "r60",
      "r63",
      "r64"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "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 Income (Loss), Net of Tax",
        "terseLabel": "Accumulated other comprehensive income (loss)"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about components of accumulated other comprehensive income (loss).",
        "label": "Accumulated Other Comprehensive Income (Loss) [Table]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss) [Table]"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeMember": {
     "auth_ref": [
      "r59",
      "r64",
      "r66",
      "r279"
     ],
     "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]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss)"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccumulatedTranslationAdjustmentMember": {
     "auth_ref": [
      "r55",
      "r64",
      "r66",
      "r279"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated other comprehensive income (loss) resulting from 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 the parent.",
        "label": "Accumulated Foreign Currency Adjustment Attributable to Parent [Member]",
        "terseLabel": "Accumulated Foreign Currency Adjustment Attributable to Parent [Member]"
       }
      }
     },
     "localname": "AccumulatedTranslationAdjustmentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems": {
     "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": "Acquired Finite-Lived Intangible Assets [Line Items]",
        "terseLabel": "Acquired Finite-Lived Intangible Assets [Line Items]"
       }
      }
     },
     "localname": "AcquiredFiniteLivedIntangibleAssetsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife": {
     "auth_ref": [
      "r170"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "Acquired Finite-lived Intangible Assets, Weighted Average Useful Life",
        "terseLabel": "Estimated useful live, finite lived intangible asset"
       }
      }
     },
     "localname": "AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems": {
     "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": "Acquired Indefinite-lived Intangible Assets [Line Items]",
        "terseLabel": "Acquired Indefinite-lived Intangible Assets [Line Items]"
       }
      }
     },
     "localname": "AcquiredIndefiniteLivedIntangibleAssetsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AcquisitionRelatedCostsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Category of acquisition-related costs allocated to (included in) reported pro forma earnings (supplemental pro forma information).",
        "label": "Acquisition-related Costs [Member]",
        "terseLabel": "Acquisition-related costs"
       }
      }
     },
     "localname": "AcquisitionRelatedCostsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdditionalPaidInCapitalCommonStock": {
     "auth_ref": [
      "r21"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 4.0,
       "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": "Additional Paid in Capital, Common Stock",
        "terseLabel": "Capital in excess of par value of common stock"
       }
      }
     },
     "localname": "AdditionalPaidInCapitalCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdditionalPaidInCapitalMember": {
     "auth_ref": [],
     "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]",
        "terseLabel": "Capital In Excess of Par"
       }
      }
     },
     "localname": "AdditionalPaidInCapitalMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis": {
     "auth_ref": [
      "r116"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of change in accounting principle. Does not include error corrections.",
        "label": "Adjustments for Change in Accounting Principle [Axis]",
        "terseLabel": "Adjustments for Change in Accounting Principle [Axis]"
       }
      }
     },
     "localname": "AdjustmentsForChangeInAccountingPrincipleAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AdjustmentsForNewAccountingPronouncementsAxis": {
     "auth_ref": [
      "r116"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by new accounting pronouncement.",
        "label": "Adjustments for New Accounting Pronouncements [Axis]",
        "terseLabel": "Adjustments for New Accounting Pronouncements [Axis]"
       }
      }
     },
     "localname": "AdjustmentsForNewAccountingPronouncementsAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue": {
     "auth_ref": [
      "r229",
      "r231",
      "r241",
      "r242"
     ],
     "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": "APIC, Share-based Payment Arrangement, Increase for Cost Recognition",
        "terseLabel": "Share-based compensation expense"
       }
      }
     },
     "localname": "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]",
        "terseLabel": "Adjustments to reconcile net income to net cash provided by operating activities:"
       }
      }
     },
     "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AllocatedShareBasedCompensationExpense": {
     "auth_ref": [
      "r231",
      "r238",
      "r240"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails": {
       "order": 2.0,
       "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": "Share-based Payment Arrangement, Expense",
        "terseLabel": "Total share-based compensation expense"
       }
      }
     },
     "localname": "AllocatedShareBasedCompensationExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails": {
       "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": "Share-based Payment Arrangement, Expense, after Tax",
        "totalLabel": "Total share-based compensation expense, net of tax"
       }
      }
     },
     "localname": "AllocatedShareBasedCompensationExpenseNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent": {
     "auth_ref": [
      "r26",
      "r153",
      "r155"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of allowance for credit loss on accounts receivable, classified as current.",
        "label": "Accounts Receivable, Allowance for Credit Loss, Current",
        "terseLabel": "Accounts receivable, allowance for doubtful accounts"
       }
      }
     },
     "localname": "AllowanceForDoubtfulAccountsReceivableCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETSParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AmortizationOfAcquisitionCosts": {
     "auth_ref": [
      "r101",
      "r168"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 9.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails": {
       "order": 7.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. 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 Acquisition Costs",
        "negatedLabel": "Charge for fair value write-up of acquired inventory sold",
        "terseLabel": "Non-cash charge on inventory step up of acquired inventory sold"
       }
      }
     },
     "localname": "AmortizationOfAcquisitionCosts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AmortizationOfFinancingCosts": {
     "auth_ref": [
      "r79",
      "r101",
      "r321"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 10.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense attributable to debt issuance costs.",
        "label": "Amortization of Debt Issuance Costs",
        "terseLabel": "Amortization of debt issuance costs"
       }
      }
     },
     "localname": "AmortizationOfFinancingCosts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AmortizationOfIntangibleAssets": {
     "auth_ref": [
      "r101",
      "r168",
      "r176"
     ],
     "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 Intangible Assets",
        "terseLabel": "Amortization of intangible assets"
       }
      }
     },
     "localname": "AmortizationOfIntangibleAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount": {
     "auth_ref": [
      "r126"
     ],
     "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": "Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount",
        "terseLabel": "Outstanding stock options excluded from calculation of diluted earnings per share (in shares)"
       }
      }
     },
     "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis": {
     "auth_ref": [
      "r126"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of antidilutive security.",
        "label": "Antidilutive Securities [Axis]",
        "terseLabel": "Antidilutive Securities [Axis]"
       }
      }
     },
     "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems": {
     "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": "Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]",
        "terseLabel": "Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]"
       }
      }
     },
     "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AntidilutiveSecuritiesNameDomain": {
     "auth_ref": [
      "r126"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Incremental common shares attributable to securities that were not included in diluted earnings per share (EPS) because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.",
        "label": "Antidilutive Securities, Name [Domain]",
        "terseLabel": "Antidilutive Securities, Name [Domain]"
       }
      }
     },
     "localname": "AntidilutiveSecuritiesNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AssetRetirementObligationAccretionExpense": {
     "auth_ref": [
      "r188",
      "r189"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.",
        "label": "Asset Retirement Obligation, Accretion Expense",
        "terseLabel": "Accretion on Asset Retirement Obligations - Liabilities"
       }
      }
     },
     "localname": "AssetRetirementObligationAccretionExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Assets": {
     "auth_ref": [
      "r144",
      "r349",
      "r361"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "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": "Assets",
        "totalLabel": "Total assets"
       }
      }
     },
     "localname": "Assets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Assets [Abstract]",
        "terseLabel": "ASSETS"
       }
      }
     },
     "localname": "AssetsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AssetsCurrent": {
     "auth_ref": [
      "r5",
      "r6",
      "r50"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "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": "Assets, Current",
        "totalLabel": "Total current assets"
       }
      }
     },
     "localname": "AssetsCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsCurrentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Assets, Current [Abstract]",
        "terseLabel": "Current assets:"
       }
      }
     },
     "localname": "AssetsCurrentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AssetsFairValueDisclosure": {
     "auth_ref": [
      "r304"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "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": "Assets, Fair Value Disclosure",
        "totalLabel": "Total assets"
       }
      }
     },
     "localname": "AssetsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsFairValueDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Assets, Fair Value Disclosure [Abstract]",
        "terseLabel": "Assets:"
       }
      }
     },
     "localname": "AssetsFairValueDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AwardTypeAxis": {
     "auth_ref": [
      "r232",
      "r239"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of award under share-based payment arrangement.",
        "label": "Award Type [Axis]",
        "terseLabel": "Award Type [Axis]"
       }
      }
     },
     "localname": "AwardTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSNarrativeDetails"
     ],
     "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]",
        "terseLabel": "Balance Sheet Location [Axis]"
       }
      }
     },
     "localname": "BalanceSheetLocationAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BalanceSheetLocationDomain": {
     "auth_ref": [
      "r286",
      "r291"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Location in the balance sheet (statement of financial position).",
        "label": "Balance Sheet Location [Domain]",
        "terseLabel": "Balance Sheet Location [Domain]"
       }
      }
     },
     "localname": "BalanceSheetLocationDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_BaseRateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum rate investor will accept.",
        "label": "Base Rate [Member]",
        "terseLabel": "Base rate"
       }
      }
     },
     "localname": "BaseRateMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_BusinessAcquisitionAcquireeDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Identification of the acquiree in a material business combination (or series of individually immaterial business combinations), which may include the name or other type of identification of the acquiree.",
        "label": "Business Acquisition, Acquiree [Domain]",
        "terseLabel": "Business Acquisition, Acquiree [Domain]"
       }
      }
     },
     "localname": "BusinessAcquisitionAcquireeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONProFormaInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_BusinessAcquisitionAxis": {
     "auth_ref": [
      "r263",
      "r264"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by business combination or series of individually immaterial business combinations.",
        "label": "Business Acquisition [Axis]",
        "terseLabel": "Business Acquisition [Axis]"
       }
      }
     },
     "localname": "BusinessAcquisitionAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONProFormaInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued": {
     "auth_ref": [
      "r274"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of shares of equity interests issued or issuable to acquire entity.",
        "label": "Business Acquisition, Equity Interest Issued or Issuable, Number of Shares",
        "terseLabel": "Shares issued to acquire entity (in shares)"
       }
      }
     },
     "localname": "BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_BusinessAcquisitionLineItems": {
     "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": "Business Acquisition [Line Items]",
        "terseLabel": "Business Acquisition [Line Items]"
       }
      }
     },
     "localname": "BusinessAcquisitionLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONProFormaInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired": {
     "auth_ref": [
      "r257"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of voting equity interests acquired at the acquisition date in the business combination.",
        "label": "Business Acquisition, Percentage of Voting Interests Acquired",
        "terseLabel": "Business acquisition, percentage of voting interest acquired"
       }
      }
     },
     "localname": "BusinessAcquisitionPercentageOfVotingInterestsAcquired",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic": {
     "auth_ref": [
      "r260",
      "r261"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.",
        "label": "Business Acquisition, Pro Forma Earnings Per Share, Basic",
        "terseLabel": "Earnings per share - basic (in dollars per share)"
       }
      }
     },
     "localname": "BusinessAcquisitionProFormaEarningsPerShareBasic",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONProFormaInformationDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted": {
     "auth_ref": [
      "r260",
      "r261"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.",
        "label": "Business Acquisition, Pro Forma Earnings Per Share, Diluted",
        "terseLabel": "Earnings per share - diluted (in dollars per share)"
       }
      }
     },
     "localname": "BusinessAcquisitionProFormaEarningsPerShareDiluted",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONProFormaInformationDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_BusinessAcquisitionProFormaInformationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Business Acquisition, Pro Forma Information [Abstract]",
        "terseLabel": "Business Acquisition, Pro Forma Information [Abstract]"
       }
      }
     },
     "localname": "BusinessAcquisitionProFormaInformationAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONProFormaInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BusinessAcquisitionProFormaInformationTextBlock": {
     "auth_ref": [
      "r260",
      "r261"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.",
        "label": "Business Acquisition, Pro Forma Information [Table Text Block]",
        "terseLabel": "Summary of pro forma information"
       }
      }
     },
     "localname": "BusinessAcquisitionProFormaInformationTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_BusinessAcquisitionSharePrice": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.",
        "label": "Business Acquisition, Share Price",
        "terseLabel": "Share price of shares issued to acquire entity (in dollars per share)"
       }
      }
     },
     "localname": "BusinessAcquisitionSharePrice",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss": {
     "auth_ref": [
      "r260",
      "r261"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.",
        "label": "Business Acquisition, Pro Forma Net Income (Loss)",
        "terseLabel": "Net income"
       }
      }
     },
     "localname": "BusinessAcquisitionsProFormaNetIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONProFormaInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessAcquisitionsProFormaRevenue": {
     "auth_ref": [
      "r260",
      "r261"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.",
        "label": "Business Acquisition, Pro Forma Revenue",
        "terseLabel": "Revenue"
       }
      }
     },
     "localname": "BusinessAcquisitionsProFormaRevenue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONProFormaInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationAcquisitionRelatedCosts": {
     "auth_ref": [
      "r256"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.",
        "label": "Business Combination, Acquisition Related Costs",
        "terseLabel": "Transaction costs"
       }
      }
     },
     "localname": "BusinessCombinationAcquisitionRelatedCosts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationConsiderationTransferred1": {
     "auth_ref": [
      "r270",
      "r271",
      "r272"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.",
        "label": "Business Combination, Consideration Transferred",
        "totalLabel": "Total consideration transferred",
        "verboseLabel": "Consideration transferred"
       }
      }
     },
     "localname": "BusinessCombinationConsiderationTransferred1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationConsiderationTransferredAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Business Combination, Consideration Transferred [Abstract]",
        "terseLabel": "Business Combination, Consideration Transferred [Abstract]"
       }
      }
     },
     "localname": "BusinessCombinationConsiderationTransferredAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable": {
     "auth_ref": [
      "r270",
      "r271"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_BusinessCombinationConsiderationTransferred1",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.",
        "label": "Business Combination, Consideration Transferred, Equity Interests Issued and Issuable",
        "terseLabel": "Fair value of Cabot Microelectronics common stock issued for KMG outstanding common stock and equity awards"
       }
      }
     },
     "localname": "BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationDisclosureTextBlock": {
     "auth_ref": [
      "r275"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).",
        "label": "Business Combination Disclosure [Text Block]",
        "terseLabel": "BUSINESS COMBINATION"
       }
      }
     },
     "localname": "BusinessCombinationDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATION"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_BusinessCombinationIntegrationRelatedCosts": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails": {
       "order": 5.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.",
        "label": "Business Combination, Integration Related Costs",
        "negatedLabel": "Acquisition and integration-related\u00a0expenses"
       }
      }
     },
     "localname": "BusinessCombinationIntegrationRelatedCosts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual": {
     "auth_ref": [
      "r259"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.",
        "label": "Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual",
        "verboseLabel": "Net income"
       }
      }
     },
     "localname": "BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual": {
     "auth_ref": [
      "r259"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.",
        "label": "Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual",
        "terseLabel": "Net sales"
       }
      }
     },
     "localname": "BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents": {
     "auth_ref": [
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
       "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, acquired at the acquisition date. 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": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents",
        "terseLabel": "Cash"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets": {
     "auth_ref": [
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
       "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 in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets",
        "terseLabel": "Prepaid expenses and other current assets"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables": {
     "auth_ref": [
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables",
        "terseLabel": "Accounts receivable"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable": {
     "auth_ref": [
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 8.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable",
        "negatedLabel": "Accounts payable"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther": {
     "auth_ref": [
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 9.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other",
        "negatedLabel": "Accrued expenses and other current liabilities"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities": {
     "auth_ref": [
      "r246",
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 10.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities",
        "negatedLabel": "Deferred income taxes liabilities"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets": {
     "auth_ref": [
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets",
        "terseLabel": "Fair value, indefinite lived intangible assets"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill": {
     "auth_ref": [
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
       "weight": 1.0
      },
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of intangible assets, excluding goodwill, acquired at the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill",
        "terseLabel": "Intangible assets",
        "totalLabel": "Intangible assets"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwillAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill [Abstract]",
        "terseLabel": "Fair Value"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwillAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles": {
     "auth_ref": [
      "r265",
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of identifiable intangible assets recognized as of the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles",
        "terseLabel": "Fair value, finite lived intangible assets"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory": {
     "auth_ref": [
      "r265",
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of inventory recognized as of the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory",
        "terseLabel": "Inventories"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet": {
     "auth_ref": [
      "r265",
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net",
        "totalLabel": "Total identifiable net assets acquired"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther": {
     "auth_ref": [
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 11.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other",
        "negatedLabel": "Other long-term liabilities"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets": {
     "auth_ref": [
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 7.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets",
        "terseLabel": "Other long-term assets"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment": {
     "auth_ref": [
      "r265",
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of property, plant, and equipment recognized as of the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment",
        "terseLabel": "Property, plant and equipment"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet": {
     "auth_ref": [
      "r266"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net",
        "totalLabel": "Total consideration transferred"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]",
        "terseLabel": "Fair values of assets acquired and liabilities assumed [Abstract]"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1": {
     "auth_ref": [
      "r258"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.",
        "label": "Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value",
        "terseLabel": "Equity consideration related to the acquisition of KMG Chemicals, Inc"
       }
      }
     },
     "localname": "BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Business Combinations [Abstract]",
        "terseLabel": "Business Combinations [Abstract]"
       }
      }
     },
     "localname": "BusinessCombinationsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock": {
     "auth_ref": [
      "r1",
      "r115",
      "r137"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for the business description and basis of presentation concepts.  Business description describes the nature and type of organization including but not limited to organizational structure as may be applicable to holding companies, parent and subsidiary relationships, business divisions, business units, business segments, affiliates and information about significant ownership of the reporting entity.  Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).",
        "label": "Business Description and Basis of Presentation [Text Block]",
        "verboseLabel": "BACKGROUND AND BASIS OF PRESENTATION"
       }
      }
     },
     "localname": "BusinessDescriptionAndBasisOfPresentationTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BACKGROUNDANDBASISOFPRESENTATION"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CapitalExpendituresIncurredButNotYetPaid": {
     "auth_ref": [
      "r104",
      "r105",
      "r106"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Future cash outflow to pay for purchases of fixed assets that have occurred.",
        "label": "Capital Expenditures Incurred but Not yet Paid",
        "terseLabel": "Purchases of property, plant and equipment in accrued liabilities and accounts payable at the end of the period"
       }
      }
     },
     "localname": "CapitalExpendituresIncurredButNotYetPaid",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashAcquiredFromAcquisition": {
     "auth_ref": [
      "r87"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).",
        "label": "Cash Acquired from Acquisition",
        "terseLabel": "Cash acquired from acquisition"
       }
      }
     },
     "localname": "CashAcquiredFromAcquisition",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashAndCashEquivalentsAtCarryingValue": {
     "auth_ref": [
      "r2",
      "r35",
      "r103"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "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, at Carrying Value",
        "verboseLabel": "Cash and cash equivalents"
       }
      }
     },
     "localname": "CashAndCashEquivalentsAtCarryingValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashAndCashEquivalentsFairValueDisclosure": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_AssetsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "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": "Cash and Cash Equivalents, Fair Value Disclosure",
        "terseLabel": "Cash and cash equivalents"
       }
      }
     },
     "localname": "CashAndCashEquivalentsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": {
     "auth_ref": [
      "r98",
      "r103",
      "r107"
     ],
     "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, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents",
        "periodEndLabel": "Cash and cash equivalents at end of period",
        "periodStartLabel": "Cash and cash equivalents at beginning of period"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect": {
     "auth_ref": [
      "r98",
      "r317"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "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": "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect",
        "totalLabel": "Increase (decrease) in cash and cash equivalents"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]",
        "terseLabel": "Supplemental Cash Flow Information:"
       }
      }
     },
     "localname": "CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ChangeInAccountingPrincipleMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A change from one generally accepted accounting principle to another generally accepted accounting principle when there are two or more generally accepted accounting principles that apply or when the accounting principle formerly used is no longer generally accepted. A change in the method of applying an accounting principle that is not treated as a change in accounting estimate also is considered a change in accounting principle.",
        "label": "Adjustments for Change in Accounting Principle [Domain]",
        "terseLabel": "Adjustments for Change in Accounting Principle [Domain]"
       }
      }
     },
     "localname": "ChangeInAccountingPrincipleMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ChangeInContractWithCustomerLiabilityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Change in Contract with Customer, Liability [Abstract]",
        "terseLabel": "Change in Contract with Customer, Liability [Abstract]"
       }
      }
     },
     "localname": "ChangeInContractWithCustomerLiabilityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSReconciliationofContractBalancesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CommitmentsAndContingencies": {
     "auth_ref": [
      "r46",
      "r197",
      "r354",
      "r368"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.",
        "label": "Commitments and Contingencies",
        "terseLabel": "Commitments and contingencies (Note 13)"
       }
      }
     },
     "localname": "CommitmentsAndContingencies",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Commitments and Contingencies Disclosure [Abstract]",
        "terseLabel": "Commitments and Contingencies Disclosure [Abstract]"
       }
      }
     },
     "localname": "CommitmentsAndContingenciesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureTextBlock": {
     "auth_ref": [
      "r196",
      "r200"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for commitments and contingencies.",
        "label": "Commitments and Contingencies Disclosure [Text Block]",
        "verboseLabel": "COMMITMENTS AND CONTINGENCIES"
       }
      }
     },
     "localname": "CommitmentsAndContingenciesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIES"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CommonStockDividendsPerShareDeclared": {
     "auth_ref": [
      "r211"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate dividends declared during the period for each share of common stock outstanding.",
        "label": "Common Stock, Dividends, Per Share, Declared",
        "terseLabel": "Dividends (in dollars per share)"
       }
      }
     },
     "localname": "CommonStockDividendsPerShareDeclared",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITYParenthetical"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_CommonStockMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Stock that is subordinate to all other stock of the issuer.",
        "label": "Common Stock [Member]",
        "terseLabel": "Common Stock"
       }
      }
     },
     "localname": "CommonStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommonStockParOrStatedValuePerShare": {
     "auth_ref": [
      "r19"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face amount or stated value per share of common stock.",
        "label": "Common Stock, Par or Stated Value Per Share",
        "terseLabel": "Common stock, par value (in dollars per share)"
       }
      }
     },
     "localname": "CommonStockParOrStatedValuePerShare",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETSParenthetical"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_CommonStockSharesAuthorized": {
     "auth_ref": [
      "r19"
     ],
     "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",
        "verboseLabel": "Common stock, authorized (in shares)"
       }
      }
     },
     "localname": "CommonStockSharesAuthorized",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETSParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockSharesIssued": {
     "auth_ref": [
      "r19"
     ],
     "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",
        "terseLabel": "Common stock, issued (in shares)"
       }
      }
     },
     "localname": "CommonStockSharesIssued",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETSParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockValue": {
     "auth_ref": [
      "r19"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 5.0,
       "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, Value, Issued",
        "terseLabel": "Common Stock Authorized: 200,000,000 shares, $0.001 par value; Issued: 39,854,529 shares at March\u00a031, 2020, and 39,592,468 shares at September\u00a030, 2019"
       }
      }
     },
     "localname": "CommonStockValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomeNetOfTax": {
     "auth_ref": [
      "r69",
      "r71",
      "r72"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": {
       "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": "Comprehensive Income (Loss), Net of Tax, Attributable to Parent",
        "totalLabel": "Comprehensive income (loss)"
       }
      }
     },
     "localname": "ComprehensiveIncomeNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomeNoteTextBlock": {
     "auth_ref": [
      "r86"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.",
        "label": "Comprehensive Income (Loss) Note [Text Block]",
        "terseLabel": "ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)"
       }
      }
     },
     "localname": "ComprehensiveIncomeNoteTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock": {
     "auth_ref": [
      "r217"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of contract balances and changes in contract balances.",
        "label": "Contract with Customer, Asset and Liability [Table Text Block]",
        "terseLabel": "Reconciliation of contract liability balances"
       }
      }
     },
     "localname": "ContractWithCustomerAssetAndLiabilityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ContractWithCustomerAssetNetNoncurrent": {
     "auth_ref": [
      "r214",
      "r216",
      "r222"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherAssetsNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as noncurrent.",
        "label": "Contract with Customer, Asset, Net, Noncurrent",
        "terseLabel": "Long-term contract assets"
       }
      }
     },
     "localname": "ContractWithCustomerAssetNetNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ContractWithCustomerLiabilityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Contract with Customer, Liability [Abstract]",
        "terseLabel": "Contract with Customer, Liability [Abstract]"
       }
      }
     },
     "localname": "ContractWithCustomerLiabilityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSReconciliationofContractBalancesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ContractWithCustomerLiabilityCurrent": {
     "auth_ref": [
      "r214",
      "r215",
      "r222"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": 7.0,
       "parentTag": "us-gaap_OtherLiabilitiesCurrent",
       "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": "Contract with Customer, Liability, Current",
        "terseLabel": "Contract liabilities (current)",
        "verboseLabel": "Contract liabilities (current)"
       }
      }
     },
     "localname": "ContractWithCustomerLiabilityCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails",
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSReconciliationofContractBalancesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ContractWithCustomerLiabilityNoncurrent": {
     "auth_ref": [
      "r214",
      "r215",
      "r222"
     ],
     "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 noncurrent.",
        "label": "Contract with Customer, Liability, Noncurrent",
        "terseLabel": "Contract liabilities (noncurrent)"
       }
      }
     },
     "localname": "ContractWithCustomerLiabilityNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSReconciliationofContractBalancesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ContractWithCustomerLiabilityRevenueRecognized": {
     "auth_ref": [
      "r223"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.",
        "label": "Contract with Customer, Liability, Revenue Recognized",
        "terseLabel": "Revenue recognized in contract liability"
       }
      }
     },
     "localname": "ContractWithCustomerLiabilityRevenueRecognized",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSReconciliationofContractBalancesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ContractualObligation": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.",
        "label": "Contractual Obligation",
        "terseLabel": "Purchase obligation"
       }
      }
     },
     "localname": "ContractualObligation",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CorporateNonSegmentMember": {
     "auth_ref": [
      "r148"
     ],
     "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]",
        "terseLabel": "Unallocated corporate expenses"
       }
      }
     },
     "localname": "CorporateNonSegmentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CostOfGoodsAndServicesSold": {
     "auth_ref": [
      "r81"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 2.0,
       "parentTag": "us-gaap_GrossProfit",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.",
        "label": "Cost of Goods and Services Sold",
        "terseLabel": "Cost of sales"
       }
      }
     },
     "localname": "CostOfGoodsAndServicesSold",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME"
     ],
     "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]",
        "terseLabel": "Cost of sales"
       }
      }
     },
     "localname": "CostOfSalesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "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]",
        "terseLabel": "Credit Facility [Axis]"
       }
      }
     },
     "localname": "CreditFacilityAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "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]",
        "terseLabel": "Credit Facility [Domain]"
       }
      }
     },
     "localname": "CreditFacilityDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.",
        "label": "Cumulative Effect of New Accounting Principle in Period of Adoption",
        "terseLabel": "Effect of the adoption of the revenue recognition accounting standards"
       }
      }
     },
     "localname": "CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Disclosure [Abstract]",
        "terseLabel": "Debt Disclosure [Abstract]"
       }
      }
     },
     "localname": "DebtDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtDisclosureTextBlock": {
     "auth_ref": [
      "r205"
     ],
     "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]",
        "terseLabel": "DEBT"
       }
      }
     },
     "localname": "DebtDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBT"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DebtInstrumentAxis": {
     "auth_ref": [
      "r15",
      "r16",
      "r17",
      "r350",
      "r352",
      "r360"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of debt instrument, including, but not limited to, draws against credit facilities.",
        "label": "Debt Instrument [Axis]",
        "terseLabel": "Debt Instrument [Axis]"
       }
      }
     },
     "localname": "DebtInstrumentAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "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": "Debt Instrument, Basis Spread on Variable Rate",
        "terseLabel": "Basis spread on variable rate"
       }
      }
     },
     "localname": "DebtInstrumentBasisSpreadOnVariableRate1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentFaceAmount": {
     "auth_ref": [
      "r320",
      "r322"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face (par) amount of debt instrument at time of issuance.",
        "label": "Debt Instrument, Face Amount",
        "terseLabel": "Debt, face amount"
       }
      }
     },
     "localname": "DebtInstrumentFaceAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentFairValue": {
     "auth_ref": [
      "r313"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.",
        "label": "Debt Instrument, Fair Value Disclosure",
        "terseLabel": "Fair value of debt"
       }
      }
     },
     "localname": "DebtInstrumentFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentLineItems": {
     "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": "Debt Instrument [Line Items]",
        "terseLabel": "Debt Instrument [Line Items]"
       }
      }
     },
     "localname": "DebtInstrumentLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentNameDomain": {
     "auth_ref": [
      "r44"
     ],
     "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]",
        "terseLabel": "Debt Instrument, Name [Domain]"
       }
      }
     },
     "localname": "DebtInstrumentNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtInstrumentTable": {
     "auth_ref": [
      "r44",
      "r109",
      "r207",
      "r208",
      "r209",
      "r210",
      "r319",
      "r320",
      "r322",
      "r359"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A table or schedule providing information pertaining to long-term debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. 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": "Schedule of Long-term Debt Instruments [Table]",
        "terseLabel": "Schedule of Long-term Debt Instruments [Table]"
       }
      }
     },
     "localname": "DebtInstrumentTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "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": "Debt Instrument, Term",
        "terseLabel": "Debt, term"
       }
      }
     },
     "localname": "DebtInstrumentTerm",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]",
        "terseLabel": "Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]"
       }
      }
     },
     "localname": "DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DeferredFinanceCostsNoncurrentGross": {
     "auth_ref": [
      "r36",
      "r321"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_OtherAssetsNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.",
        "label": "Debt Issuance Cost, Gross, Noncurrent",
        "terseLabel": "Prepaid unamortized debt issuance cost - revolver"
       }
      }
     },
     "localname": "DeferredFinanceCostsNoncurrentGross",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredFinanceCostsNoncurrentNet": {
     "auth_ref": [
      "r36",
      "r321"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.",
        "label": "Debt Issuance Costs, Noncurrent, Net",
        "terseLabel": "Prepaid debt issuance cost"
       }
      }
     },
     "localname": "DeferredFinanceCostsNoncurrentNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETSParenthetical",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredIncomeTaxAssetsNet": {
     "auth_ref": [
      "r250"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 5.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.",
        "label": "Deferred Income Tax Assets, Net",
        "terseLabel": "Deferred income taxes"
       }
      }
     },
     "localname": "DeferredIncomeTaxAssetsNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredIncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r101",
      "r108",
      "r251",
      "r252"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 6.0,
       "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": "Deferred Income Tax Expense (Benefit)",
        "terseLabel": "Deferred income tax expense (benefit)"
       }
      }
     },
     "localname": "DeferredIncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredIncomeTaxLiabilitiesNet": {
     "auth_ref": [
      "r247",
      "r250"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_Liabilities",
       "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 Tax Liabilities, Net",
        "terseLabel": "Deferred income taxes"
       }
      }
     },
     "localname": "DeferredIncomeTaxLiabilitiesNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Defined Benefit Plan [Abstract]",
        "terseLabel": "Postretirement Obligations in Foreign Jurisdictions [Abstract]"
       }
      }
     },
     "localname": "DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DepreciationAndAmortization": {
     "auth_ref": [
      "r101",
      "r184"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails": {
       "order": 3.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.",
        "label": "Depreciation, Depletion and Amortization, Nonproduction",
        "negatedLabel": "Depreciation and amortization"
       }
      }
     },
     "localname": "DepreciationAndAmortization",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DepreciationDepletionAndAmortization": {
     "auth_ref": [
      "r101",
      "r142"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 2.0,
       "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": "Depreciation, Depletion and Amortization",
        "terseLabel": "Depreciation and amortization"
       }
      }
     },
     "localname": "DepreciationDepletionAndAmortization",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeContractTypeDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financial instrument or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.",
        "label": "Derivative Contract [Domain]",
        "terseLabel": "Derivative Contract [Domain]"
       }
      }
     },
     "localname": "DerivativeContractTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DerivativeFairValueOfDerivativeAsset": {
     "auth_ref": [
      "r51",
      "r54",
      "r289",
      "r347"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.",
        "label": "Derivative Asset, Fair Value, Gross Asset",
        "terseLabel": "Derivative assets"
       }
      }
     },
     "localname": "DerivativeFairValueOfDerivativeAsset",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeFairValueOfDerivativeLiability": {
     "auth_ref": [
      "r51",
      "r54",
      "r289",
      "r347"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.",
        "label": "Derivative Liability, Fair Value, Gross Liability",
        "terseLabel": "Derivative liabilities"
       }
      }
     },
     "localname": "DerivativeFairValueOfDerivativeLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeGainLossOnDerivativeNet": {
     "auth_ref": [
      "r288"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.",
        "label": "Derivative, Gain (Loss) on Derivative, Net",
        "terseLabel": "Other income (loss), net"
       }
      }
     },
     "localname": "DerivativeGainLossOnDerivativeNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeGainLossOnDerivativeNetAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Derivative, Gain (Loss) on Derivative, Net [Abstract]",
        "terseLabel": "Derivative, Gain (Loss) on Derivative, Net [Abstract]"
       }
      }
     },
     "localname": "DerivativeGainLossOnDerivativeNetAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentRiskAxis": {
     "auth_ref": [
      "r287",
      "r290",
      "r293",
      "r296"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of derivative contract.",
        "label": "Derivative Instrument [Axis]",
        "terseLabel": "Derivative Instrument [Axis]"
       }
      }
     },
     "localname": "DerivativeInstrumentRiskAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Derivative Instruments and Hedging Activities Disclosure [Abstract]",
        "terseLabel": "Derivative Instruments and Hedging Activities Disclosure [Abstract]"
       }
      }
     },
     "localname": "DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock": {
     "auth_ref": [
      "r303"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.",
        "label": "Derivative Instruments and Hedging Activities Disclosure [Text Block]",
        "verboseLabel": "DERIVATIVE FINANCIAL INSTRUMENTS"
       }
      }
     },
     "localname": "DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTS"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable": {
     "auth_ref": [
      "r284",
      "r287",
      "r293",
      "r296",
      "r297",
      "r300",
      "r301"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.",
        "label": "Derivative Instruments, Gain (Loss) [Table]",
        "terseLabel": "Derivative Instruments, Gain (Loss) [Table]"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossLineItems": {
     "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": "Derivative Instruments, Gain (Loss) [Line Items]",
        "terseLabel": "Derivative Instruments, Gain (Loss) [Line Items]"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimateOfTimeToTransfer1": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Estimated period for the anticipated transfer of gain (loss), net, from accumulated other comprehensive income into earnings, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer",
        "terseLabel": "Gain (loss) reclassified from accumulated other comprehensive income into interest expense, estimated time to transfer"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimateOfTimeToTransfer1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred": {
     "auth_ref": [
      "r302"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.",
        "label": "Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred",
        "terseLabel": "Reclassified from accumulated other comprehensive income into interest expense"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilities": {
     "auth_ref": [
      "r52",
      "r53",
      "r313"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_FinancialLiabilitiesFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.",
        "label": "Derivative Liability",
        "terseLabel": "Derivative financial instruments"
       }
      }
     },
     "localname": "DerivativeLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilitiesCurrent": {
     "auth_ref": [
      "r52"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_OtherLiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.",
        "label": "Derivative Liability, Current",
        "terseLabel": "Interest rate swap liability"
       }
      }
     },
     "localname": "DerivativeLiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLineItems": {
     "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": "Derivative [Line Items]",
        "terseLabel": "Derivative [Line Items]"
       }
      }
     },
     "localname": "DerivativeLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeNotionalAmount": {
     "auth_ref": [
      "r281",
      "r283"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nominal or face amount used to calculate payment on derivative.",
        "label": "Derivative, Notional Amount",
        "terseLabel": "Derivative notional amount"
       }
      }
     },
     "localname": "DerivativeNotionalAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeTable": {
     "auth_ref": [
      "r113",
      "r280",
      "r282",
      "r283",
      "r284",
      "r285",
      "r292",
      "r293",
      "r298",
      "r299",
      "r301"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule that describes and identifies a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.",
        "label": "Derivative [Table]",
        "terseLabel": "Derivative [Table]"
       }
      }
     },
     "localname": "DerivativeTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativesFairValueLineItems": {
     "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": "Derivatives, Fair Value [Line Items]",
        "terseLabel": "Derivatives, Fair Value [Line Items]"
       }
      }
     },
     "localname": "DerivativesFairValueLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DesignatedAsHedgingInstrumentMember": {
     "auth_ref": [
      "r284"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument designated as hedging instrument under Generally Accepted Accounting Principles (GAAP).",
        "label": "Designated as Hedging Instrument [Member]",
        "terseLabel": "Derivatives designated as hedging instruments"
       }
      }
     },
     "localname": "DesignatedAsHedgingInstrumentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DevelopedTechnologyRightsMember": {
     "auth_ref": [
      "r269"
     ],
     "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]",
        "terseLabel": "EPA product registration rights"
       }
      }
     },
     "localname": "DevelopedTechnologyRightsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock": {
     "auth_ref": [
      "r243"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for share-based payment arrangement.",
        "label": "Share-based Payment Arrangement [Text Block]",
        "verboseLabel": "SHARE-BASED COMPENSATION PLANS"
       }
      }
     },
     "localname": "DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANS"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Share-based Payment Arrangement [Abstract]",
        "terseLabel": "Share-based Payment Arrangement [Abstract]"
       }
      }
     },
     "localname": "DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DividendsCommonStock": {
     "auth_ref": [
      "r211",
      "r358"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).",
        "label": "Dividends, Common Stock",
        "negatedLabel": "Dividends"
       }
      }
     },
     "localname": "DividendsCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DividendsPayableCurrent": {
     "auth_ref": [
      "r9",
      "r42"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_OtherLiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "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. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
        "label": "Dividends Payable, Current",
        "terseLabel": "Dividends payable"
       }
      }
     },
     "localname": "DividendsPayableCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EarningsPerShareAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Earnings Per Share [Abstract]",
        "terseLabel": "Earnings Per Share [Abstract]"
       }
      }
     },
     "localname": "EarningsPerShareAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_EarningsPerShareBasic": {
     "auth_ref": [
      "r77",
      "r117",
      "r122",
      "r123",
      "r124",
      "r125",
      "r128",
      "r356",
      "r370"
     ],
     "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": "Earnings Per Share, Basic",
        "terseLabel": "Basic (in dollars per share)",
        "verboseLabel": "Basic earnings per share (in dollars per share)"
       }
      }
     },
     "localname": "EarningsPerShareBasic",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME",
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EarningsPerShareDiluted": {
     "auth_ref": [
      "r77",
      "r117",
      "r122",
      "r123",
      "r124",
      "r125",
      "r128",
      "r356",
      "r370"
     ],
     "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": "Earnings Per Share, Diluted",
        "terseLabel": "Diluted (in dollars per share)",
        "verboseLabel": "Diluted earnings per share (in dollars per share)"
       }
      }
     },
     "localname": "EarningsPerShareDiluted",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME",
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EarningsPerShareReconciliationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Earnings Per Share Reconciliation [Abstract]",
        "verboseLabel": "Earnings per share:"
       }
      }
     },
     "localname": "EarningsPerShareReconciliationAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EarningsPerShareTextBlock": {
     "auth_ref": [
      "r129"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for earnings per share.",
        "label": "Earnings Per Share [Text Block]",
        "verboseLabel": "EARNINGS PER SHARE"
       }
      }
     },
     "localname": "EarningsPerShareTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHARE"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": {
     "auth_ref": [
      "r317"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 4.0,
       "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. Excludes amounts 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": "Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents",
        "terseLabel": "Effect of exchange rate changes on cash"
       }
      }
     },
     "localname": "EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EffectiveIncomeTaxRateContinuingOperations": {
     "auth_ref": [
      "r112",
      "r248",
      "r249"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
        "label": "Effective Income Tax Rate Reconciliation, Percent",
        "terseLabel": "Effective tax rate"
       }
      }
     },
     "localname": "EffectiveIncomeTaxRateContinuingOperations",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/INCOMETAXESDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_EmployeeRelatedLiabilitiesCurrent": {
     "auth_ref": [
      "r42"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherLiabilitiesCurrent",
       "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": "Employee-related Liabilities, Current",
        "terseLabel": "Accrued compensation"
       }
      }
     },
     "localname": "EmployeeRelatedLiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense": {
     "auth_ref": [
      "r238"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails": {
       "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": "Share-based Payment Arrangement, Expense, Tax Benefit",
        "negatedLabel": "Tax benefit"
       }
      }
     },
     "localname": "EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EmployeeStockOptionMember": {
     "auth_ref": [
      "r237"
     ],
     "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]",
        "terseLabel": "Stock options"
       }
      }
     },
     "localname": "EmployeeStockOptionMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EnvironmentalExitCostByPropertyAxis": {
     "auth_ref": [
      "r199"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of property related to exit costs.",
        "label": "Environmental Exit Cost by Property [Axis]",
        "terseLabel": "Environmental Exit Cost by Property [Axis]"
       }
      }
     },
     "localname": "EnvironmentalExitCostByPropertyAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EnvironmentalExitCostLineItems": {
     "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": "Environmental Exit Cost [Line Items]",
        "terseLabel": "Environmental Exit Cost [Line Items]"
       }
      }
     },
     "localname": "EnvironmentalExitCostLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EnvironmentalExitCostsAnticipatedCost": {
     "auth_ref": [
      "r199"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total anticipated costs associated with remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal, or abandonment of a particular property resulting from unanticipated contamination of the assets.",
        "label": "Environmental Exit Costs, Anticipated Cost",
        "terseLabel": "Estimated remediation cost"
       }
      }
     },
     "localname": "EnvironmentalExitCostsAnticipatedCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EnvironmentalExitCostsNameOfPropertyDomain": {
     "auth_ref": [
      "r199"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the property being sold, disposed, or abandoned that requires remediation, site restoration, postclosure, monitoring commitments, or other exit costs as a result of unanticipated contamination of the assets.",
        "label": "Environmental Exit Costs, Name of Property [Domain]",
        "terseLabel": "Environmental Exit Costs, Name of Property [Domain]"
       }
      }
     },
     "localname": "EnvironmentalExitCostsNameOfPropertyDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EnvironmentalRemediationExpense": {
     "auth_ref": [
      "r190",
      "r191"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.",
        "label": "Environmental Remediation Expense",
        "terseLabel": "Remediation expense recognized"
       }
      }
     },
     "localname": "EnvironmentalRemediationExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EquityComponentDomain": {
     "auth_ref": [
      "r206"
     ],
     "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]",
        "terseLabel": "Equity Component [Domain]"
       }
      }
     },
     "localname": "EquityComponentDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY",
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems": {
     "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": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]",
        "terseLabel": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable": {
     "auth_ref": [
      "r304",
      "r305",
      "r306",
      "r311"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about asset and liability measured at fair value on recurring and nonrecurring basis.",
        "label": "Fair Value, Recurring and Nonrecurring [Table]",
        "terseLabel": "Fair Value, Recurring and Nonrecurring [Table]"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock": {
     "auth_ref": [
      "r304",
      "r305",
      "r306",
      "r310",
      "r311"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.",
        "label": "Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]",
        "terseLabel": "Fair value of financial instruments"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueByFairValueHierarchyLevelAxis": {
     "auth_ref": [
      "r225",
      "r226",
      "r228",
      "r305",
      "r343"
     ],
     "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]",
        "terseLabel": "Fair Value Hierarchy and NAV [Axis]"
       }
      }
     },
     "localname": "FairValueByFairValueHierarchyLevelAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails",
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByMeasurementFrequencyAxis": {
     "auth_ref": [
      "r304",
      "r305",
      "r307",
      "r308",
      "r312"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by measurement frequency.",
        "label": "Measurement Frequency [Axis]",
        "terseLabel": "Measurement Frequency [Axis]"
       }
      }
     },
     "localname": "FairValueByMeasurementFrequencyAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueDisclosuresAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Fair Value Disclosures [Abstract]",
        "terseLabel": "Fair Value Disclosures [Abstract]"
       }
      }
     },
     "localname": "FairValueDisclosuresAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueDisclosuresTextBlock": {
     "auth_ref": [
      "r309"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.",
        "label": "Fair Value Disclosures [Text Block]",
        "verboseLabel": "FAIR VALUE OF FINANCIAL INSTRUMENTS"
       }
      }
     },
     "localname": "FairValueDisclosuresTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTS"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueInputsLevel1Member": {
     "auth_ref": [
      "r225",
      "r226",
      "r228",
      "r305",
      "r344"
     ],
     "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]",
        "terseLabel": "Level 1"
       }
      }
     },
     "localname": "FairValueInputsLevel1Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel2Member": {
     "auth_ref": [
      "r225",
      "r226",
      "r228",
      "r305",
      "r345"
     ],
     "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]",
        "terseLabel": "Level 2"
       }
      }
     },
     "localname": "FairValueInputsLevel2Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails",
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel3Member": {
     "auth_ref": [
      "r225",
      "r226",
      "r228",
      "r305",
      "r346"
     ],
     "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]",
        "terseLabel": "Level 3"
       }
      }
     },
     "localname": "FairValueInputsLevel3Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementFrequencyDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measurement frequency.",
        "label": "Measurement Frequency [Domain]",
        "terseLabel": "Measurement Frequency [Domain]"
       }
      }
     },
     "localname": "FairValueMeasurementFrequencyDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": {
     "auth_ref": [],
     "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]",
        "terseLabel": "Fair Value Hierarchy and NAV [Domain]"
       }
      }
     },
     "localname": "FairValueMeasurementsFairValueHierarchyDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails",
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementsRecurringMember": {
     "auth_ref": [
      "r309",
      "r312"
     ],
     "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]",
        "terseLabel": "Recurring"
       }
      }
     },
     "localname": "FairValueMeasurementsRecurringMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable": {
     "auth_ref": [
      "r286",
      "r292",
      "r300"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule that discloses the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.",
        "label": "Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]",
        "terseLabel": "Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]"
       }
      }
     },
     "localname": "FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinanceLeasePrincipalPayments": {
     "auth_ref": [
      "r332",
      "r335"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 7.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for principal payment on finance lease.",
        "label": "Finance Lease, Principal Payments",
        "negatedTerseLabel": "Principal payments under financing lease obligations"
       }
      }
     },
     "localname": "FinanceLeasePrincipalPayments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancialLiabilitiesFairValueDisclosure": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.",
        "label": "Financial Liabilities Fair Value Disclosure",
        "totalLabel": "Total liabilities"
       }
      }
     },
     "localname": "FinancialLiabilitiesFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of finite-lived and indefinite-lived intangible assets acquired as part of a business combination.",
        "label": "Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]",
        "terseLabel": "Components of identifiable intangible asset acquired and their estimated useful lives"
       }
      }
     },
     "localname": "FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetWeightedAveragePeriodBeforeNextRenewalOrExtension": {
     "auth_ref": [
      "r180"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average period before the next renewal or extension (both explicit and implicit) for intangible assets that have been renewed or extended, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "Finite-Lived Intangible Asset, Weighted Average Period before Next Renewal or Extension",
        "terseLabel": "Weighted average useful life"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetWeightedAveragePeriodBeforeNextRenewalOrExtension",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization": {
     "auth_ref": [
      "r175"
     ],
     "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": "Finite-Lived Intangible Assets, Accumulated Amortization",
        "terseLabel": "Other intangible assets subject to amortization, accumulated amortization"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAccumulatedAmortization",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable": {
     "auth_ref": [
      "r169"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A table containing detailed characteristics of finite-lived intangible assets acquired during a business combination. Finite-lived intangible assets are assets that have no physical form, but have expected future economic benefit, and are expected to be used over a defined period. Acquired finite-lived intangible assets are disclosed by major class (assets that can be grouped together because they are similar, either by their nature or by their use in operations of the Entity) and in total. Additionally, any significant residual value (the expected value of the asset at the end of its useful life) and the weighted-average amortization period are also disclosed.",
        "label": "Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table]",
        "terseLabel": "Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table]"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year",
        "terseLabel": "Remainder of 2020"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSAmortizationExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive": {
     "auth_ref": [
      "r177"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Finite-Lived Intangible Assets, Amortization Expense, Year Five",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSAmortizationExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour": {
     "auth_ref": [
      "r177"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Finite-Lived Intangible Assets, Amortization Expense, Year Four",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearFour",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSAmortizationExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree": {
     "auth_ref": [
      "r177"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Finite-Lived Intangible Assets, Amortization Expense, Year Three",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearThree",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSAmortizationExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo": {
     "auth_ref": [
      "r177"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Finite-Lived Intangible Assets, Amortization Expense, Year Two",
        "terseLabel": "2021"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSAmortizationExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis": {
     "auth_ref": [
      "r169",
      "r172",
      "r175",
      "r179",
      "r348"
     ],
     "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]",
        "terseLabel": "Finite-Lived Intangible Assets by Major Class [Axis]"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsByMajorClassAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]",
        "terseLabel": "Estimated Amortization Expense"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSAmortizationExpenseDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsGross": {
     "auth_ref": [
      "r175",
      "r348"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_IntangibleAssetsGrossExcludingGoodwill",
       "weight": 1.0
      }
     },
     "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": "Finite-Lived Intangible Assets, Gross",
        "terseLabel": "Other intangible assets subject to amortization, gross carrying amount"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsGross",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsLineItems": {
     "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": "Finite-Lived Intangible Assets [Line Items]",
        "terseLabel": "Finite-Lived Intangible Assets [Line Items]"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain": {
     "auth_ref": [
      "r169",
      "r174"
     ],
     "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]",
        "terseLabel": "Finite-Lived Intangible Assets, Major Class Name [Domain]"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsMajorClassNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsNetAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Finite-Lived Intangible Assets, Net [Abstract]",
        "terseLabel": "Other intangible assets subject to amortization:"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsNetAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ForeignCurrencyTransactionGainLossUnrealized": {
     "auth_ref": [
      "r102",
      "r314",
      "r315",
      "r316"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 7.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.",
        "label": "Foreign Currency Transaction Gain (Loss), Unrealized",
        "negatedLabel": "Non-cash foreign exchange (gain) loss"
       }
      }
     },
     "localname": "ForeignCurrencyTransactionGainLossUnrealized",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ForeignExchangeContractMember": {
     "auth_ref": [
      "r225",
      "r295"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument whose primary underlying risk is tied to foreign exchange rates.",
        "label": "Foreign Exchange Contract [Member]",
        "terseLabel": "Foreign contracts"
       }
      }
     },
     "localname": "ForeignExchangeContractMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_GainLossOnSaleOfPropertyPlantEquipment": {
     "auth_ref": [
      "r101"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 8.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "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": "Gain (Loss) on Disposition of Property Plant Equipment",
        "negatedLabel": "Loss (Gain) on disposal of property, plant and equipment"
       }
      }
     },
     "localname": "GainLossOnSaleOfPropertyPlantEquipment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Goodwill": {
     "auth_ref": [
      "r161",
      "r162"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet",
       "weight": 1.0
      },
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "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": "Goodwill, ending balance",
        "periodStartLabel": "Goodwill, beginning balance",
        "terseLabel": "Goodwill"
       }
      }
     },
     "localname": "Goodwill",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillRollforwardDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Goodwill and Intangible Assets Disclosure [Abstract]",
        "terseLabel": "Goodwill and Intangible Assets Disclosure [Abstract]"
       }
      }
     },
     "localname": "GoodwillAndIntangibleAssetsDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock": {
     "auth_ref": [
      "r183"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for goodwill and intangible assets.",
        "label": "Goodwill and Intangible Assets Disclosure [Text Block]",
        "verboseLabel": "GOODWILL AND OTHER INTANGIBLE ASSETS"
       }
      }
     },
     "localname": "GoodwillAndIntangibleAssetsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETS"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_GoodwillForeignCurrencyTranslationGainLoss": {
     "auth_ref": [
      "r163"
     ],
     "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": "Goodwill, Foreign Currency Translation Gain (Loss)",
        "terseLabel": "Foreign currency translation impact"
       }
      }
     },
     "localname": "GoodwillForeignCurrencyTranslationGainLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillRollforwardDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GoodwillLineItems": {
     "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": "Goodwill [Line Items]",
        "terseLabel": "Goodwill [Line Items]"
       }
      }
     },
     "localname": "GoodwillLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillRollforwardDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_GoodwillOtherIncreaseDecrease": {
     "auth_ref": [
      "r164"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.",
        "label": "Goodwill, Other Increase (Decrease)",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "GoodwillOtherIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillRollforwardDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GoodwillRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Goodwill [Roll Forward]",
        "terseLabel": "Goodwill [Roll Forward]"
       }
      }
     },
     "localname": "GoodwillRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillRollforwardDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_GrossProfit": {
     "auth_ref": [
      "r80"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 2.0,
       "parentTag": "us-gaap_OperatingIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.",
        "label": "Gross Profit",
        "totalLabel": "Gross profit"
       }
      }
     },
     "localname": "GrossProfit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HedgingDesignationAxis": {
     "auth_ref": [
      "r284",
      "r297"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by designation of purpose of derivative instrument.",
        "label": "Hedging Designation [Axis]",
        "terseLabel": "Hedging Designation [Axis]"
       }
      }
     },
     "localname": "HedgingDesignationAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_HedgingDesignationDomain": {
     "auth_ref": [
      "r284"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Designation of purpose of derivative instrument.",
        "label": "Hedging Designation [Domain]",
        "terseLabel": "Hedging Designation [Domain]"
       }
      }
     },
     "localname": "HedgingDesignationDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill": {
     "auth_ref": [
      "r101",
      "r181"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.",
        "label": "Impairment of Intangible Assets (Excluding Goodwill)",
        "terseLabel": "Asset impairment"
       }
      }
     },
     "localname": "ImpairmentOfIntangibleAssetsExcludingGoodwill",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments": {
     "auth_ref": [
      "r111"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 2.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": 1.0
      },
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "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": "Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest",
        "totalLabel": "Income before income taxes"
       }
      }
     },
     "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeStatementAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Income Statement [Abstract]",
        "terseLabel": "Income Statement [Abstract]"
       }
      }
     },
     "localname": "IncomeStatementAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeStatementLocationAxis": {
     "auth_ref": [
      "r186"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by location in the income statement.",
        "label": "Income Statement Location [Axis]",
        "terseLabel": "Income Statement Location [Axis]"
       }
      }
     },
     "localname": "IncomeStatementLocationAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails",
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeStatementLocationDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Location in the income statement.",
        "label": "Income Statement Location [Domain]",
        "terseLabel": "Income Statement Location [Domain]"
       }
      }
     },
     "localname": "IncomeStatementLocationDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails",
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_IncomeTaxDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Income Tax Disclosure [Abstract]",
        "terseLabel": "Income Tax Disclosure [Abstract]"
       }
      }
     },
     "localname": "IncomeTaxDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeTaxDisclosureTextBlock": {
     "auth_ref": [
      "r255"
     ],
     "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]",
        "verboseLabel": "INCOME TAXES"
       }
      }
     },
     "localname": "IncomeTaxDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/INCOMETAXES"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_IncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r108",
      "r143",
      "r254"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 1.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "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 Expense (Benefit)",
        "verboseLabel": "Provision for income taxes"
       }
      }
     },
     "localname": "IncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccountsPayable": {
     "auth_ref": [
      "r100"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 15.0,
       "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": "Increase (Decrease) in Accounts Payable",
        "terseLabel": "Accounts payable"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccountsPayable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccountsReceivable": {
     "auth_ref": [
      "r100"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 12.0,
       "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": "Increase (Decrease) in Accounts Receivable",
        "negatedLabel": "Accounts receivable"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccountsReceivable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInInventories": {
     "auth_ref": [
      "r100"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 13.0,
       "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": "Increase (Decrease) in Inventories",
        "negatedLabel": "Inventories"
       }
      }
     },
     "localname": "IncreaseDecreaseInInventories",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Increase (Decrease) in Operating Capital [Abstract]",
        "terseLabel": "Changes in operating assets and liabilities:"
       }
      }
     },
     "localname": "IncreaseDecreaseInOperatingCapitalAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncreaseDecreaseInOtherCurrentLiabilities": {
     "auth_ref": [
      "r100"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 16.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in current liabilities classified as other.",
        "label": "Increase (Decrease) in Other Current Liabilities",
        "terseLabel": "Accrued expenses, income taxes payable and other liabilities"
       }
      }
     },
     "localname": "IncreaseDecreaseInOtherCurrentLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets": {
     "auth_ref": [
      "r100"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 14.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in prepaid expenses, and assets classified as other.",
        "label": "Increase (Decrease) in Prepaid Expense and Other Assets",
        "negatedLabel": "Prepaid expenses and other assets"
       }
      }
     },
     "localname": "IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInStockholdersEquityRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Increase (Decrease) in Stockholders' Equity [Roll Forward]",
        "terseLabel": "Increase (Decrease) in Stockholders' Equity [Roll Forward]"
       }
      }
     },
     "localname": "IncreaseDecreaseInStockholdersEquityRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable": {
     "auth_ref": [
      "r171",
      "r267"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A table containing detailed information about the characteristics and cost, by total and major class, of indefinite-lived intangible assets acquired as part of a business combination. Indefinite-lived intangible assets are assets that have no physical form, but have expected future economic benefit. The future benefit is not expected to diminish over a stated period of time. Acquired indefinite-lived intangible assets are disclosed by major class (assets that can be grouped together because they are similar, either by their nature or by their use in operations of the entity) and in total.",
        "label": "Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Table]",
        "terseLabel": "Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Table]"
       }
      }
     },
     "localname": "IndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis": {
     "auth_ref": [
      "r171",
      "r178"
     ],
     "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]",
        "terseLabel": "Indefinite-lived Intangible Assets [Axis]"
       }
      }
     },
     "localname": "IndefiniteLivedIntangibleAssetsByMajorClassAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems": {
     "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": "Indefinite-lived Intangible Assets [Line Items]",
        "terseLabel": "Indefinite-lived Intangible Assets [Line Items]"
       }
      }
     },
     "localname": "IndefiniteLivedIntangibleAssetsByMajorClassLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill": {
     "auth_ref": [
      "r178"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_IntangibleAssetsGrossExcludingGoodwill",
       "weight": 1.0
      }
     },
     "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": "Indefinite-lived Intangible Assets (Excluding Goodwill)",
        "terseLabel": "Other intangible assets not subject to amortization"
       }
      }
     },
     "localname": "IndefiniteLivedIntangibleAssetsExcludingGoodwill",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain": {
     "auth_ref": [
      "r171",
      "r178"
     ],
     "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]",
        "terseLabel": "Indefinite-lived Intangible Assets, Major Class Name [Domain]"
       }
      }
     },
     "localname": "IndefiniteLivedIntangibleAssetsMajorClassNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails",
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_IndefiniteLivedIntangibleAssetsRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Indefinite-lived Intangible Assets [Roll Forward]",
        "terseLabel": "Other intangible assets not subject to amortization:"
       }
      }
     },
     "localname": "IndefiniteLivedIntangibleAssetsRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IntangibleAssetsGrossExcludingGoodwill": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before accumulated amortization of intangible assets, excluding goodwill.",
        "label": "Intangible Assets, Gross (Excluding Goodwill)",
        "totalLabel": "Other intangible assets"
       }
      }
     },
     "localname": "IntangibleAssetsGrossExcludingGoodwill",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IntangibleAssetsNetExcludingGoodwill": {
     "auth_ref": [
      "r167",
      "r173"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 4.0,
       "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 (Excluding Goodwill)",
        "terseLabel": "Other intangible assets, net"
       }
      }
     },
     "localname": "IntangibleAssetsNetExcludingGoodwill",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpense": {
     "auth_ref": [
      "r75",
      "r141",
      "r318",
      "r321",
      "r357"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 2.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": -1.0
      },
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails": {
       "order": 8.0,
       "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": "Interest Expense",
        "negatedLabel": "Interest expense",
        "terseLabel": "Interest Expense"
       }
      }
     },
     "localname": "InterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestPayableCurrent": {
     "auth_ref": [
      "r9",
      "r10",
      "r42"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": 10.0,
       "parentTag": "us-gaap_OtherLiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
        "label": "Interest Payable, Current",
        "terseLabel": "Accrued interest"
       }
      }
     },
     "localname": "InterestPayableCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestRateSwapMember": {
     "auth_ref": [
      "r294"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Forward based contracts in which two parties agree to swap periodic payments that are fixed at the outset of the swap contract with variable payments based on a market interest rate (index rate) over a specified period.",
        "label": "Interest Rate Swap [Member]",
        "terseLabel": "Interest rate swap"
       }
      }
     },
     "localname": "InterestRateSwapMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InventoryDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Inventory Disclosure [Abstract]",
        "terseLabel": "Inventory Disclosure [Abstract]"
       }
      }
     },
     "localname": "InventoryDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_InventoryDisclosureTextBlock": {
     "auth_ref": [
      "r160"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.",
        "label": "Inventory Disclosure [Text Block]",
        "verboseLabel": "INVENTORIES"
       }
      }
     },
     "localname": "InventoryDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/INVENTORIES"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_InventoryFinishedGoodsNetOfReserves": {
     "auth_ref": [
      "r27",
      "r159"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/INVENTORIESDetails": {
       "order": 3.0,
       "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": "Inventory, Finished Goods, Net of Reserves",
        "terseLabel": "Finished goods"
       }
      }
     },
     "localname": "InventoryFinishedGoodsNetOfReserves",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/INVENTORIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InventoryNet": {
     "auth_ref": [
      "r3",
      "r49",
      "r158"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      },
      "http://www.cabotcmp.com/role/INVENTORIESDetails": {
       "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": "Inventory, Net",
        "totalLabel": "Total",
        "verboseLabel": "Inventories"
       }
      }
     },
     "localname": "InventoryNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.cabotcmp.com/role/INVENTORIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InventoryNetItemsNetOfReserveAlternativeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Inventory, Net, Items Net of Reserve Alternative [Abstract]",
        "terseLabel": "Inventory, Net, Items Net of Reserve Alternative [Abstract]"
       }
      }
     },
     "localname": "InventoryNetItemsNetOfReserveAlternativeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/INVENTORIESDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InventoryRawMaterialsNetOfReserves": {
     "auth_ref": [
      "r29",
      "r159"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/INVENTORIESDetails": {
       "order": 1.0,
       "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 unprocessed items to be consumed in the manufacturing or production process.",
        "label": "Inventory, Raw Materials, Net of Reserves",
        "terseLabel": "Raw materials"
       }
      }
     },
     "localname": "InventoryRawMaterialsNetOfReserves",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/INVENTORIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InventoryWorkInProcessNetOfReserves": {
     "auth_ref": [
      "r28",
      "r159"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/INVENTORIESDetails": {
       "order": 2.0,
       "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": "Inventory, Work in Process, Net of Reserves",
        "terseLabel": "Work in process"
       }
      }
     },
     "localname": "InventoryWorkInProcessNetOfReserves",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/INVENTORIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentIncomeInterest": {
     "auth_ref": [
      "r83",
      "r140"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 3.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": 1.0
      },
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails": {
       "order": 6.0,
       "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 on nonoperating securities.",
        "label": "Investment Income, Interest",
        "terseLabel": "Interest income"
       }
      }
     },
     "localname": "InvestmentIncomeInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentsAndOtherNoncurrentAssets": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_OtherAssetsNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investments, and noncurrent assets classified as other.",
        "label": "Investments and Other Noncurrent Assets",
        "terseLabel": "Long-term SERP investment"
       }
      }
     },
     "localname": "InvestmentsAndOtherNoncurrentAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentsFairValueDisclosure": {
     "auth_ref": [
      "r304"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_AssetsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.",
        "label": "Investments, Fair Value Disclosure",
        "terseLabel": "Other long-term investments"
       }
      }
     },
     "localname": "InvestmentsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LeaseCost": {
     "auth_ref": [
      "r339",
      "r341"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESNarrativeDetails": {
       "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": "Lease, Cost",
        "totalLabel": "Lease cost"
       }
      }
     },
     "localname": "LeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LeasesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Leases [Abstract]"
       }
      }
     },
     "localname": "LeasesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock": {
     "auth_ref": [
      "r340"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.",
        "label": "Lessee, Operating Lease, Liability, Maturity [Table Text Block]",
        "terseLabel": "Future maturities of operating lease liabilities"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails_1": {
       "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 lease.",
        "label": "Lessee, Operating Lease, Liability, Payments, Due",
        "totalLabel": "Total future lease payments"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails": {
       "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 payments for operating lease, due after fifth fiscal year following latest fiscal year.",
        "label": "Lessee, Operating Lease, Liability, Payments, Due after Year Five",
        "terseLabel": "2025 and future years"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails": {
       "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 payments for operating lease, due in fifth fiscal year following latest fiscal year.",
        "label": "Lessee, Operating Lease, Liability, Payments, Due Year Five",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.",
        "label": "Lessee, Operating Lease, Liability, Payments, Due Year Four",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFour",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails": {
       "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 payments for operating lease, due in third fiscal year following latest fiscal year.",
        "label": "Lessee, Operating Lease, Liability, Payments, Due Year Three",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearThree",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails": {
       "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 payments for operating lease, due in second fiscal year following latest fiscal year.",
        "label": "Lessee, Operating Lease, Liability, Payments, Due Year Two",
        "terseLabel": "2021"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails": {
       "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 payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.",
        "label": "Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year",
        "terseLabel": "Remainder of 2020"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails_1": {
       "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 payments in excess of discounted obligation for lease payments for operating lease.",
        "label": "Lessee, Operating Lease, Liability, Undiscounted Excess Amount",
        "terseLabel": "Less: Imputed interest"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityUndiscountedExcessAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeasesTextBlock": {
     "auth_ref": [
      "r342"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability.",
        "label": "Lessee, Operating Leases [Text Block]",
        "terseLabel": "LEASES"
       }
      }
     },
     "localname": "LesseeOperatingLeasesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASES"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LetterOfCreditMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A document typically issued by a financial institution which acts as a guarantee of payment to a beneficiary, or as the source of payment for a specific transaction (for example, wiring funds to a foreign exporter if and when specified merchandise is accepted pursuant to the terms of the letter of credit).",
        "label": "Letter of Credit [Member]",
        "terseLabel": "Letter of credit sub-facility"
       }
      }
     },
     "localname": "LetterOfCreditMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_Liabilities": {
     "auth_ref": [
      "r41"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "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": "Liabilities",
        "totalLabel": "Total liabilities"
       }
      }
     },
     "localname": "Liabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesAndStockholdersEquity": {
     "auth_ref": [
      "r25",
      "r353",
      "r366"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "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": "Liabilities and Equity",
        "totalLabel": "Total liabilities and stockholders\u2019 equity"
       }
      }
     },
     "localname": "LiabilitiesAndStockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesAndStockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities and Equity [Abstract]",
        "terseLabel": "LIABILITIES AND STOCKHOLDERS\u2019 EQUITY"
       }
      }
     },
     "localname": "LiabilitiesAndStockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilitiesCurrent": {
     "auth_ref": [
      "r43"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 4.0,
       "parentTag": "us-gaap_Liabilities",
       "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": "Liabilities, Current",
        "totalLabel": "Total current liabilities"
       }
      }
     },
     "localname": "LiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesCurrentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities, Current [Abstract]",
        "terseLabel": "Current liabilities:"
       }
      }
     },
     "localname": "LiabilitiesCurrentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilitiesFairValueDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities, Fair Value Disclosure [Abstract]",
        "terseLabel": "Liabilities:"
       }
      }
     },
     "localname": "LiabilitiesFairValueDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilityForCatastropheClaimsCarryingAmount": {
     "auth_ref": [
      "r371"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": 9.0,
       "parentTag": "us-gaap_OtherLiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of estimated liability as of the balance sheet date for the specific conflagration, earthquake, windstorm, explosion, or similar event.",
        "label": "Liability for Catastrophe Claims, Carrying Amount",
        "terseLabel": "KMG - Bernuth warehouse fire-related (See Note 13)"
       }
      }
     },
     "localname": "LiabilityForCatastropheClaimsCarryingAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditFacilityAxis": {
     "auth_ref": [
      "r39",
      "r109"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by name of lender, which may be a single entity (for example, but not limited to, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit.",
        "label": "Lender Name [Axis]",
        "terseLabel": "Lender Name [Axis]"
       }
      }
     },
     "localname": "LineOfCreditFacilityAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LineOfCreditFacilityCommitmentFeePercentage": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.",
        "label": "Line of Credit Facility, Commitment Fee Percentage",
        "terseLabel": "Commitment fee percentage"
       }
      }
     },
     "localname": "LineOfCreditFacilityCommitmentFeePercentage",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_LineOfCreditFacilityLenderDomain": {
     "auth_ref": [
      "r39"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Identification of the lender, which may be a single entity (for example, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit, including a letter of credit facility.",
        "label": "Line of Credit Facility, Lender [Domain]",
        "terseLabel": "Line of Credit Facility, Lender [Domain]"
       }
      }
     },
     "localname": "LineOfCreditFacilityLenderDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity": {
     "auth_ref": [
      "r39"
     ],
     "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": "Line of Credit Facility, Maximum Borrowing Capacity",
        "terseLabel": "Line of credit facility, borrowing capacity"
       }
      }
     },
     "localname": "LineOfCreditFacilityMaximumBorrowingCapacity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity": {
     "auth_ref": [
      "r39"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).",
        "label": "Line of Credit Facility, Remaining Borrowing Capacity",
        "terseLabel": "Available credit under the Revolving Credit Facility"
       }
      }
     },
     "localname": "LineOfCreditFacilityRemainingBorrowingCapacity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars.",
        "label": "Line of Credit [Member]",
        "terseLabel": "Line of credit"
       }
      }
     },
     "localname": "LineOfCreditMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LitigationReserveCurrent": {
     "auth_ref": [
      "r46",
      "r197",
      "r198"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.",
        "label": "Estimated Litigation Liability, Current",
        "terseLabel": "Estimated reserve, remaining"
       }
      }
     },
     "localname": "LitigationReserveCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "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]",
        "terseLabel": "LIBOR"
       }
      }
     },
     "localname": "LondonInterbankOfferedRateLIBORMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LongMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicates an ownership position in, or purchase of, a security.",
        "label": "Long [Member]",
        "terseLabel": "Buy"
       }
      }
     },
     "localname": "LongMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LongTermDebt": {
     "auth_ref": [
      "r17",
      "r204",
      "r352",
      "r364"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "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": "Long-term Debt",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "LongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Long-term Debt, Unclassified [Abstract]",
        "terseLabel": "Long-term Debt, Unclassified [Abstract]"
       }
      }
     },
     "localname": "LongTermDebtAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongTermDebtByMaturityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Long-term Debt, Fiscal Year Maturity [Abstract]",
        "terseLabel": "Principal Repayments"
       }
      }
     },
     "localname": "LongTermDebtByMaturityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongTermDebtCurrent": {
     "auth_ref": [
      "r40"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "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": "Long-term Debt, Current Maturities",
        "terseLabel": "Current portion of long-term debt"
       }
      }
     },
     "localname": "LongTermDebtCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive": {
     "auth_ref": [
      "r114",
      "r202"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_LongTermDebt",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal after Year Five",
        "terseLabel": "Greater than 5 years"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive": {
     "auth_ref": [
      "r114",
      "r202"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_LongTermDebt",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Year Five",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour": {
     "auth_ref": [
      "r114",
      "r202"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_LongTermDebt",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Year Four",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree": {
     "auth_ref": [
      "r114",
      "r202"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_LongTermDebt",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Year Three",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo": {
     "auth_ref": [
      "r114",
      "r202"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_LongTermDebt",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Year Two",
        "terseLabel": "2021"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear": {
     "auth_ref": [
      "r114"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_LongTermDebt",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year",
        "terseLabel": "Remainder of 2020"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtNoncurrent": {
     "auth_ref": [
      "r44"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "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": "Long-term Debt, Excluding Current Maturities",
        "terseLabel": "Long-term debt, net of current portion, less prepaid debt issuance costs of $16,420 at March\u00a031, 2020 and $17,900 at September\u00a030, 2019"
       }
      }
     },
     "localname": "LongTermDebtNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongtermDebtTypeAxis": {
     "auth_ref": [
      "r44"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of long-term debt.",
        "label": "Long-term Debt, Type [Axis]",
        "terseLabel": "Long-term Debt, Type [Axis]"
       }
      }
     },
     "localname": "LongtermDebtTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongtermDebtTypeDomain": {
     "auth_ref": [
      "r44",
      "r203"
     ],
     "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]",
        "terseLabel": "Long-term Debt, Type [Domain]"
       }
      }
     },
     "localname": "LongtermDebtTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LossFromCatastrophes": {
     "auth_ref": [
      "r84"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails": {
       "order": 4.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The charge against earnings in the period for the uninsured portion of a loss from a fire, explosion, or natural disaster (hurricane, earthquake).",
        "label": "Loss from Catastrophes",
        "negatedLabel": "Costs related to KMG-Bernuth warehouse fire (See Note 13) and restructuring of wood treatment business"
       }
      }
     },
     "localname": "LossFromCatastrophes",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivities": {
     "auth_ref": [
      "r98"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "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": "Net Cash Provided by (Used in) Financing Activities",
        "totalLabel": "Net cash provided by financing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Financing Activities [Abstract]",
        "terseLabel": "Cash flows from financing activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivities": {
     "auth_ref": [
      "r98"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 2.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from investing activities, including 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": "Net Cash Provided by (Used in) Investing Activities",
        "totalLabel": "Net cash used in investing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Investing Activities [Abstract]",
        "terseLabel": "Net Cash Provided by (Used in) Investing Activities [Abstract]"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivities": {
     "auth_ref": [
      "r98",
      "r99",
      "r102"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 3.0,
       "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": "Net Cash Provided by (Used in) Operating Activities",
        "totalLabel": "Net cash provided by operating activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Operating Activities [Abstract]",
        "terseLabel": "Cash flows from operating activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetIncomeLoss": {
     "auth_ref": [
      "r67",
      "r70",
      "r76",
      "r102",
      "r127",
      "r355",
      "r369"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": {
       "order": 1.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0
      },
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "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 Income (Loss) Attributable to Parent",
        "totalLabel": "Net income",
        "verboseLabel": "Net income"
       }
      }
     },
     "localname": "NetIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic": {
     "auth_ref": [
      "r117",
      "r120"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.",
        "label": "Net Income (Loss) Available to Common Stockholders, Basic",
        "verboseLabel": "Net income available to common shares"
       }
      }
     },
     "localname": "NetIncomeLossAvailableToCommonStockholdersBasic",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Income (Loss) Available to Common Stockholders, Basic [Abstract]",
        "verboseLabel": "Numerator:"
       }
      }
     },
     "localname": "NetIncomeLossAvailableToCommonStockholdersBasicAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems": {
     "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": "New Accounting Pronouncements or Change in Accounting Principle [Line Items]",
        "terseLabel": "New Accounting Pronouncements or Change in Accounting Principle [Line Items]"
       }
      }
     },
     "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable": {
     "auth_ref": [
      "r116",
      "r118"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Summarization of the changes in an accounting principle or a new accounting pronouncement, including the line items affected by the change and the financial effects of the change on those particular line items.",
        "label": "New Accounting Pronouncements or Change in Accounting Principle [Table]",
        "terseLabel": "New Accounting Pronouncements or Change in Accounting Principle [Table]"
       }
      }
     },
     "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "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]",
        "terseLabel": "EFFECTS OF RECENT ACCOUNTING PRONOUNCEMENTS"
       }
      }
     },
     "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_NondesignatedMember": {
     "auth_ref": [
      "r284"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument not designated as hedging instrument under Generally Accepted Accounting Principles (GAAP).",
        "label": "Not Designated as Hedging Instrument [Member]",
        "terseLabel": "Derivatives not designated as hedging instruments"
       }
      }
     },
     "localname": "NondesignatedMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NonrecurringAdjustmentAxis": {
     "auth_ref": [
      "r262"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information about material and nonrecurring adjustment directly attributable to the business combination(s) included in the reported pro forma revenue and earnings (supplemental pro forma information).",
        "label": "Nonrecurring Adjustment [Axis]",
        "terseLabel": "Nonrecurring Adjustment [Axis]"
       }
      }
     },
     "localname": "NonrecurringAdjustmentAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NonrecurringAdjustmentDomain": {
     "auth_ref": [
      "r262"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Material, nonrecurring adjustment(s) allocated (included) to (in) reported pro forma revenue and earnings (supplemental pro forma information).",
        "label": "Nonrecurring Adjustment [Domain]",
        "terseLabel": "Nonrecurring Adjustment [Domain]"
       }
      }
     },
     "localname": "NonrecurringAdjustmentDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NotesPayableToBanksMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A written promise to pay a note to a bank.",
        "label": "Notes Payable to Banks [Member]",
        "terseLabel": "Term loan facility"
       }
      }
     },
     "localname": "NotesPayableToBanksMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTPrincipalRepaymentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NumberOfOperatingSegments": {
     "auth_ref": [],
     "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": "Number of Operating Segments",
        "terseLabel": "Number of operating segments"
       }
      }
     },
     "localname": "NumberOfOperatingSegments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGNarrativeDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_NumberOfReportableSegments": {
     "auth_ref": [],
     "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": "Number of Reportable Segments",
        "terseLabel": "Number of reportable segments"
       }
      }
     },
     "localname": "NumberOfReportableSegments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BACKGROUNDANDBASISOFPRESENTATIONDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGNarrativeDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent": {
     "auth_ref": [
      "r64"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.",
        "label": "OCI, before Reclassifications, before Tax, Attributable to Parent",
        "terseLabel": "Change in fair value"
       }
      }
     },
     "localname": "OciBeforeReclassificationsBeforeTaxAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingExpenses": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 1.0,
       "parentTag": "us-gaap_OperatingIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.",
        "label": "Operating Expenses",
        "totalLabel": "Total operating expenses"
       }
      }
     },
     "localname": "OperatingExpenses",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingIncomeLoss": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 1.0,
       "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": "Operating Income (Loss)",
        "totalLabel": "Operating income"
       }
      }
     },
     "localname": "OperatingIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingIncomeLossAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Operating Income (Loss) [Abstract]",
        "terseLabel": "Operating expenses:"
       }
      }
     },
     "localname": "OperatingIncomeLossAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OperatingLeaseCost": {
     "auth_ref": [
      "r334",
      "r341"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESNarrativeDetails": {
       "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 Lease, Cost",
        "terseLabel": "Operating lease cost"
       }
      }
     },
     "localname": "OperatingLeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Lessee, Operating Lease, Liability, Payment, Due [Abstract]",
        "terseLabel": "Lessee, Operating Lease, Liability, Payment, Due [Abstract]"
       }
      }
     },
     "localname": "OperatingLeaseLiabilitiesPaymentsDueAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OperatingLeaseLiability": {
     "auth_ref": [
      "r331"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails_1": {
       "order": 2.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease.",
        "label": "Operating Lease, Liability",
        "terseLabel": "Operating lease liability",
        "totalLabel": "Operating lease liability"
       }
      }
     },
     "localname": "OperatingLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails",
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseLiabilityCurrent": {
     "auth_ref": [
      "r331"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_OtherLiabilitiesCurrent",
       "weight": 1.0
      },
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_OperatingLeaseLiability",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.",
        "label": "Operating Lease, Liability, Current",
        "netLabel": "Current portion of operating lease liability",
        "terseLabel": "Less: Current portion of operating lease liability",
        "verboseLabel": "Current portion of lease liability for operating leases"
       }
      }
     },
     "localname": "OperatingLeaseLiabilityCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails",
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails",
      "http://www.cabotcmp.com/role/LEASESNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseLiabilityNoncurrent": {
     "auth_ref": [
      "r331"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_OperatingLeaseLiability",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.",
        "label": "Operating Lease, Liability, Noncurrent",
        "terseLabel": "Long-term portion of operating lease liability",
        "verboseLabel": "Long-term portion of lease liability for operating leases"
       }
      }
     },
     "localname": "OperatingLeaseLiabilityNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMaturitiesofOperatingLeaseLiabilitiesDetails",
      "http://www.cabotcmp.com/role/LEASESNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasePayments": {
     "auth_ref": [
      "r333",
      "r335"
     ],
     "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 Lease, Payments",
        "terseLabel": "Cash paid during the period for lease liabilities"
       }
      }
     },
     "localname": "OperatingLeasePayments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseRightOfUseAsset": {
     "auth_ref": [
      "r330"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_OtherAssetsNoncurrent",
       "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 Asset",
        "terseLabel": "Operating lease, right of use asset",
        "verboseLabel": "Long-term right of use asset"
       }
      }
     },
     "localname": "OperatingLeaseRightOfUseAsset",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESNarrativeDetails",
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails",
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent": {
     "auth_ref": [
      "r338",
      "r341"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average discount rate for operating lease calculated at point in time.",
        "label": "Operating Lease, Weighted Average Discount Rate, Percent",
        "terseLabel": "Weighted average discount rate for operating leases"
       }
      }
     },
     "localname": "OperatingLeaseWeightedAverageDiscountRatePercent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1": {
     "auth_ref": [
      "r337",
      "r341"
     ],
     "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": "Operating Lease, Weighted Average Remaining Lease Term",
        "terseLabel": "Weighted average lease term for operating leases"
       }
      }
     },
     "localname": "OperatingLeaseWeightedAverageRemainingLeaseTerm1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESNarrativeDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDue": {
     "auth_ref": [
      "r325",
      "r327"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.",
        "label": "Operating Leases, Future Minimum Payments Due",
        "totalLabel": "Total future minimum lease payments"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]",
        "terseLabel": "Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent": {
     "auth_ref": [
      "r325",
      "r327"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments Due, Next Twelve Months",
        "terseLabel": "2020"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears": {
     "auth_ref": [
      "r325",
      "r327"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments, Due in Five Years",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueInFiveYears",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears": {
     "auth_ref": [
      "r325",
      "r327"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments, Due in Four Years",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueInFourYears",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears": {
     "auth_ref": [
      "r325",
      "r327"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments, Due in Three Years",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueInThreeYears",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears": {
     "auth_ref": [
      "r325",
      "r327"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments, Due in Two Years",
        "terseLabel": "2021"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueInTwoYears",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter": {
     "auth_ref": [
      "r325",
      "r327"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments, Due Thereafter",
        "terseLabel": "Thereafter"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueThereafter",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESMinimumLeasePaymentsUnderOperatingLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock": {
     "auth_ref": [
      "r201",
      "r323",
      "r324",
      "r326",
      "r328"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions.",
        "label": "Lessee, Operating Lease, Disclosure [Table Text Block]",
        "terseLabel": "Minimum lease payments under operating leases"
       }
      }
     },
     "localname": "OperatingLeasesOfLesseeDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/LEASESTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OperatingSegmentsMember": {
     "auth_ref": [
      "r139",
      "r147"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Identifies 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": "Operating Segments [Member]",
        "terseLabel": "Operating segment"
       }
      }
     },
     "localname": "OperatingSegmentsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Organization, Consolidation and Presentation of Financial Statements [Abstract]",
        "terseLabel": "Organization, Consolidation and Presentation of Financial Statements [Abstract]"
       }
      }
     },
     "localname": "OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherAccruedLiabilitiesCurrent": {
     "auth_ref": [
      "r8",
      "r9",
      "r10",
      "r42"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": 11.0,
       "parentTag": "us-gaap_OtherLiabilitiesCurrent",
       "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, Current",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "OtherAccruedLiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherAssetsDisclosureTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for other assets. This disclosure includes other current assets and other noncurrent assets.",
        "label": "Other Assets Disclosure [Text Block]",
        "verboseLabel": "OTHER LONG-TERM ASSETS"
       }
      }
     },
     "localname": "OtherAssetsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETS"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherAssetsMiscellaneousNoncurrent": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_OtherAssetsNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.",
        "label": "Other Assets, Miscellaneous, Noncurrent",
        "verboseLabel": "Other long-term assets"
       }
      }
     },
     "localname": "OtherAssetsMiscellaneousNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherAssetsNoncurrent": {
     "auth_ref": [
      "r36"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 6.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of noncurrent assets classified as other.",
        "label": "Other Assets, Noncurrent",
        "totalLabel": "Total",
        "verboseLabel": "Other long-term assets"
       }
      }
     },
     "localname": "OtherAssetsNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherAssetsNoncurrentDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Other Assets, Noncurrent Disclosure [Abstract]",
        "terseLabel": "Other long-term assets [Abstract]"
       }
      }
     },
     "localname": "OtherAssetsNoncurrentDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent": {
     "auth_ref": [
      "r58",
      "r60",
      "r276",
      "r278"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": {
       "order": 3.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
       "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, attributable to parent.",
        "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent",
        "negatedLabel": "Minimum pension liability adjustment"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent": {
     "auth_ref": [
      "r276",
      "r277",
      "r278"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
       "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": "Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent",
        "terseLabel": "Foreign currency translation adjustments",
        "verboseLabel": "Foreign currency translation adjustment"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent": {
     "auth_ref": [
      "r60"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": {
       "order": 2.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent.",
        "label": "Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent",
        "terseLabel": "Net unrealized loss on cash flow hedges",
        "verboseLabel": "Cash flow hedges"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax": {
     "auth_ref": [
      "r56",
      "r60"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.",
        "label": "Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax",
        "verboseLabel": "Unrealized gain (loss) on cash flow hedging instruments"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax": {
     "auth_ref": [
      "r56"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).",
        "label": "Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax",
        "terseLabel": "Interest rate swap"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent": {
     "auth_ref": [
      "r68",
      "r71",
      "r276",
      "r277",
      "r278"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": {
       "order": 2.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of other comprehensive income (loss) attributable to parent entity.",
        "label": "Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent",
        "terseLabel": "Other comprehensive income, net of tax",
        "totalLabel": "Other comprehensive income, net of tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]",
        "terseLabel": "Other comprehensive income, net of tax:"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherIntangibleAssetsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Intangible assets classified as other.",
        "label": "Other Intangible Assets [Member]",
        "terseLabel": "Other indefinite-lived intangibles"
       }
      }
     },
     "localname": "OtherIntangibleAssetsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherLiabilitiesCurrent": {
     "auth_ref": [
      "r7",
      "r8",
      "r42"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.",
        "label": "Other Liabilities, Current",
        "totalLabel": "Total",
        "verboseLabel": "Accrued expenses, income taxes payable and other current liabilities"
       }
      }
     },
     "localname": "OtherLiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESDetails",
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherLiabilitiesNoncurrent": {
     "auth_ref": [
      "r45"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.",
        "label": "Other Liabilities, Noncurrent",
        "terseLabel": "Other long-term liabilities"
       }
      }
     },
     "localname": "OtherLiabilitiesNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherNoncurrentLiabilitiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing other noncurrent liabilities.",
        "label": "Other Noncurrent Liabilities [Member]",
        "terseLabel": "Other long-term liabilities"
       }
      }
     },
     "localname": "OtherNoncurrentLiabilitiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueofDerivativeInstrumentsintheConsolidatedBalanceSheetDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherNonoperatingIncomeExpense": {
     "auth_ref": [
      "r84"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 4.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of income (expense) related to nonoperating activities, classified as other.",
        "label": "Other Nonoperating Income (Expense)",
        "verboseLabel": "Other income (expense), net"
       }
      }
     },
     "localname": "OtherNonoperatingIncomeExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherNonoperatingIncomeExpenseMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing other nonoperating income (expense).",
        "label": "Other Nonoperating Income (Expense) [Member]",
        "terseLabel": "Other income (expense), net"
       }
      }
     },
     "localname": "OtherNonoperatingIncomeExpenseMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherOperatingActivitiesCashFlowStatement": {
     "auth_ref": [],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 11.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example,  cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).",
        "label": "Other Operating Activities, Cash Flow Statement",
        "verboseLabel": "Other"
       }
      }
     },
     "localname": "OtherOperatingActivitiesCashFlowStatement",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PayablesAndAccrualsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Payables and Accruals [Abstract]",
        "terseLabel": "Payables and Accruals [Abstract]"
       }
      }
     },
     "localname": "PayablesAndAccrualsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_PaymentsForRepurchaseOfCommonStock": {
     "auth_ref": [
      "r94"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 6.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow to reacquire common stock during the period.",
        "label": "Payments for Repurchase of Common Stock",
        "negatedLabel": "Repurchases of common stock"
       }
      }
     },
     "localname": "PaymentsForRepurchaseOfCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsOfDebtIssuanceCosts": {
     "auth_ref": [
      "r96"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.",
        "label": "Payments of Debt Issuance Costs",
        "negatedLabel": "Debt issuance costs"
       }
      }
     },
     "localname": "PaymentsOfDebtIssuanceCosts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsOfDividendsCommonStock": {
     "auth_ref": [
      "r94"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 1.0,
       "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": "Payments of Ordinary Dividends, Common Stock",
        "negatedLabel": "Dividends paid"
       }
      }
     },
     "localname": "PaymentsOfDividendsCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireBusinessesGross": {
     "auth_ref": [
      "r90",
      "r273"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_BusinessCombinationConsiderationTransferred1",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.",
        "label": "Payments to Acquire Businesses, Gross",
        "totalLabel": "Total cash consideration paid"
       }
      }
     },
     "localname": "PaymentsToAcquireBusinessesGross",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired": {
     "auth_ref": [
      "r90"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.",
        "label": "Payments to Acquire Businesses, Net of Cash Acquired",
        "negatedLabel": "Acquisition of a business, net of cash acquired",
        "terseLabel": "Acquisition of business, net of cash acquired"
       }
      }
     },
     "localname": "PaymentsToAcquireBusinessesNetOfCashAcquired",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireProductiveAssets": {
     "auth_ref": [
      "r91"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.",
        "label": "Payments to Acquire Productive Assets",
        "terseLabel": "Capital expenditures"
       }
      }
     },
     "localname": "PaymentsToAcquireProductiveAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment": {
     "auth_ref": [
      "r91"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "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": "Payments to Acquire Property, Plant, and Equipment",
        "negatedLabel": "Additions to property, plant and equipment"
       }
      }
     },
     "localname": "PaymentsToAcquirePropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PercentageOfDebtHedgedByInterestRateDerivatives": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of an entity's outstanding debt that is designated as a hedged item in cash flow, fair value, or net investment hedge.",
        "label": "Percentage of Debt Hedged by Interest Rate Derivatives",
        "terseLabel": "Percentage of debt hedged by interest rate swaps"
       }
      }
     },
     "localname": "PercentageOfDebtHedgedByInterestRateDerivatives",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_PositionAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by position taken for a security.",
        "label": "Position [Axis]",
        "terseLabel": "Position [Axis]"
       }
      }
     },
     "localname": "PositionAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PositionDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicates position taken for a security.",
        "label": "Position [Domain]",
        "terseLabel": "Position [Domain]"
       }
      }
     },
     "localname": "PositionDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PrepaidExpenseAndOtherAssetsCurrent": {
     "auth_ref": [
      "r5",
      "r33",
      "r34"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "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 in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.",
        "label": "Prepaid Expense and Other Assets, Current",
        "terseLabel": "Prepaid expenses and other current assets"
       }
      }
     },
     "localname": "PrepaidExpenseAndOtherAssetsCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromIssuanceOfCommonStock": {
     "auth_ref": [
      "r92"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 5.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow from the additional capital contribution to the entity.",
        "label": "Proceeds from Issuance of Common Stock",
        "terseLabel": "Proceeds from issuance of stock"
       }
      }
     },
     "localname": "ProceedsFromIssuanceOfCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromIssuanceOfLongTermDebt": {
     "auth_ref": [
      "r93"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 4.0,
       "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 Issuance of Long-term Debt",
        "terseLabel": "Proceeds from issuance of long-term debt"
       }
      }
     },
     "localname": "ProceedsFromIssuanceOfLongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromLifeInsurancePolicies": {
     "auth_ref": [
      "r89",
      "r97"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 4.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow for proceeds from settlement of corporate-owned life insurance policy, classified as investing activities. Includes, but is not limited to, bank-owned life insurance policy.",
        "label": "Proceeds from Life Insurance Policy",
        "terseLabel": "Cash settlement of life insurance policy"
       }
      }
     },
     "localname": "ProceedsFromLifeInsurancePolicies",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromLinesOfCredit": {
     "auth_ref": [
      "r93",
      "r110"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 8.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.",
        "label": "Proceeds from Lines of Credit",
        "terseLabel": "Proceeds from revolving line of credit"
       }
      }
     },
     "localname": "ProceedsFromLinesOfCredit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromSaleOfPropertyHeldForSale": {
     "auth_ref": [
      "r88"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.",
        "label": "Proceeds from Sale of Property Held-for-sale",
        "terseLabel": "Proceeds from sales of property, plant and equipment"
       }
      }
     },
     "localname": "ProceedsFromSaleOfPropertyHeldForSale",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentNet": {
     "auth_ref": [
      "r12",
      "r13",
      "r185",
      "r367"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "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",
        "terseLabel": "Property, plant and equipment, net"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProvisionForDoubtfulAccounts": {
     "auth_ref": [
      "r78",
      "r156"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 4.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense (reversal of expense) for expected credit loss on accounts receivable.",
        "label": "Accounts Receivable, Credit Loss Expense (Reversal)",
        "terseLabel": "Provision for doubtful accounts"
       }
      }
     },
     "localname": "ProvisionForDoubtfulAccounts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent": {
     "auth_ref": [
      "r64"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.",
        "label": "Reclassification from AOCI, Current Period, before Tax, Attributable to Parent",
        "terseLabel": "Other comprehensive income, before tax"
       }
      }
     },
     "localname": "ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails",
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent": {
     "auth_ref": [
      "r64",
      "r73"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.",
        "label": "Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent",
        "terseLabel": "Reclassification from AOCI, net of tax"
       }
      }
     },
     "localname": "ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReclassificationFromAociCurrentPeriodTax": {
     "auth_ref": [
      "r61",
      "r65",
      "r253"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).",
        "label": "Reclassification from AOCI, Current Period, Tax",
        "terseLabel": "Reclassification from AOCI, tax"
       }
      }
     },
     "localname": "ReclassificationFromAociCurrentPeriodTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis": {
     "auth_ref": [
      "r194",
      "r195"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Pertinent information about recorded unconditional purchase arrangements to acquire goods or services, by category of goods or services.",
        "label": "Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]",
        "terseLabel": "Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]"
       }
      }
     },
     "localname": "RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RepaymentsOfLongTermDebt": {
     "auth_ref": [
      "r95"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 3.0,
       "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": "Repayments of Long-term Debt",
        "negatedLabel": "Repayment of long-term debt"
       }
      }
     },
     "localname": "RepaymentsOfLongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ResearchAndDevelopmentExpense": {
     "auth_ref": [
      "r245",
      "r373"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 2.0,
       "parentTag": "us-gaap_OperatingExpenses",
       "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 Expense",
        "terseLabel": "Research, development and technical"
       }
      }
     },
     "localname": "ResearchAndDevelopmentExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME"
     ],
     "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]",
        "terseLabel": "Research, development and technical"
       }
      }
     },
     "localname": "ResearchAndDevelopmentExpenseMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails"
     ],
     "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]",
        "terseLabel": "Restricted Stock Units"
       }
      }
     },
     "localname": "RestrictedStockUnitsRSUMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RetainedEarningsAccumulatedDeficit": {
     "auth_ref": [
      "r22",
      "r211",
      "r365"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "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 (Accumulated Deficit)",
        "terseLabel": "Retained earnings"
       }
      }
     },
     "localname": "RetainedEarningsAccumulatedDeficit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RetainedEarningsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
        "label": "Retained Earnings [Member]",
        "terseLabel": "Retained Earnings"
       }
      }
     },
     "localname": "RetainedEarningsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY",
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RevenueFromContractWithCustomerAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Revenue from Contract with Customer [Abstract]",
        "terseLabel": "Revenue from Contract with Customer [Abstract]"
       }
      }
     },
     "localname": "RevenueFromContractWithCustomerAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax": {
     "auth_ref": [
      "r220",
      "r221"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 1.0,
       "parentTag": "us-gaap_GrossProfit",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, excluding 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": "Revenue from Contract with Customer, Excluding Assessed Tax",
        "terseLabel": "Revenue"
       }
      }
     },
     "localname": "RevenueFromContractWithCustomerExcludingAssessedTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGRevenuefromExternalCustomersDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RevenueFromContractWithCustomerTextBlock": {
     "auth_ref": [
      "r224"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.",
        "label": "Revenue from Contract with Customer [Text Block]",
        "terseLabel": "REVENUE FROM CONTRACTS WITH CUSTOMERS"
       }
      }
     },
     "localname": "RevenueFromContractWithCustomerTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERS"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RevenuePerformanceObligationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Revenue, Performance Obligation [Abstract]",
        "terseLabel": "Revenue, Performance Obligation [Abstract]"
       }
      }
     },
     "localname": "RevenuePerformanceObligationAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSTransactionPriceAllocatedtoRemainingPerformanceObligationsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevenueRemainingPerformanceObligation": {
     "auth_ref": [
      "r218"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of transaction price allocated to performance obligation that has not been recognized as revenue.",
        "label": "Revenue, Remaining Performance Obligation, Amount",
        "terseLabel": "Revenue expected to be recognized on contract liability amounts as of end of period"
       }
      }
     },
     "localname": "RevenueRemainingPerformanceObligation",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSTransactionPriceAllocatedtoRemainingPerformanceObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems": {
     "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": "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]",
        "terseLabel": "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]"
       }
      }
     },
     "localname": "RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSTransactionPriceAllocatedtoRemainingPerformanceObligationsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1": {
     "auth_ref": [
      "r219"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period",
        "terseLabel": "Revenue expected to be recognized on contract liability, satisfaction period"
       }
      }
     },
     "localname": "RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSTransactionPriceAllocatedtoRemainingPerformanceObligationsDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis": {
     "auth_ref": [
      "r219"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Start date of time band for expected timing of satisfaction of remaining performance obligation, in CCYY-MM-DD format.",
        "label": "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]",
        "terseLabel": "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]"
       }
      }
     },
     "localname": "RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSTransactionPriceAllocatedtoRemainingPerformanceObligationsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about expected timing for satisfying remaining performance obligation.",
        "label": "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]",
        "terseLabel": "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]"
       }
      }
     },
     "localname": "RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSTransactionPriceAllocatedtoRemainingPerformanceObligationsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock": {
     "auth_ref": [
      "r219"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of expected timing for satisfying remaining performance obligation.",
        "label": "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]",
        "terseLabel": "Transaction price allocated to remaining performance obligation"
       }
      }
     },
     "localname": "RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "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]",
        "terseLabel": "Revolving credit facility"
       }
      }
     },
     "localname": "RevolvingCreditFacilityMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability": {
     "auth_ref": [
      "r336",
      "r341"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase in right-of-use asset obtained in exchange for operating lease liability.",
        "label": "Right-of-Use Asset Obtained in Exchange for Operating Lease Liability",
        "terseLabel": "Right of use asset obtained in exchange for lease liabilities"
       }
      }
     },
     "localname": "RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the (a) 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 (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses.",
        "label": "Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]",
        "verboseLabel": "Accrued expenses, income taxes payable and other current liabilities"
       }
      }
     },
     "localname": "ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCRUEDEXPENSESINCOMETAXESPAYABLEANDOTHERCURRENTLIABILITIESTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock": {
     "auth_ref": [
      "r64"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the components of accumulated other comprehensive income (loss).",
        "label": "Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]",
        "terseLabel": "Accumulated other comprehensive income (loss)"
       }
      }
     },
     "localname": "ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable": {
     "auth_ref": [
      "r126"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule for securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by Antidilutive Securities.",
        "label": "Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]",
        "terseLabel": "Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]"
       }
      }
     },
     "localname": "ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of contingent payment arrangements including the terms that will result in payment and the accounting treatment that will be followed if such contingencies occur, including the potential impact on earnings per share if contingencies are to be settled in common stock of the entity. The description also may include the period over which amounts are expected to be paid, and changes in the amount since the previous reporting period. This also includes contingent options and commitments.",
        "label": "Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]",
        "terseLabel": "Summary of components of total consideration"
       }
      }
     },
     "localname": "ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable": {
     "auth_ref": [
      "r263",
      "r264"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule reflecting each material business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities.",
        "label": "Schedule of Business Acquisitions, by Acquisition [Table]",
        "terseLabel": "Schedule of Business Acquisitions, by Acquisition [Table]"
       }
      }
     },
     "localname": "ScheduleOfBusinessAcquisitionsByAcquisitionTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONAllocationofFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONConsiderationDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONProFormaInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock": {
     "auth_ref": [
      "r263",
      "r264"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table  does not include leveraged buyouts.",
        "label": "Schedule of Business Acquisitions, by Acquisition [Table Text Block]",
        "terseLabel": "Summary of preliminary allocation of fair values of assets acquired and liabilities assumed"
       }
      }
     },
     "localname": "ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock": {
     "auth_ref": [
      "r287",
      "r293",
      "r297"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.",
        "label": "Derivative Instruments, Gain (Loss) [Table Text Block]",
        "terseLabel": "Schedule of derivative instruments on Consolidated Statements of Income"
       }
      }
     },
     "localname": "ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock": {
     "auth_ref": [
      "r292"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.",
        "label": "Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]",
        "terseLabel": "Schedule of derivative instruments in the Consolidated Balance Sheets"
       }
      }
     },
     "localname": "ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": {
     "auth_ref": [
      "r127"
     ],
     "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]",
        "terseLabel": "Schedule of earnings per share"
       }
      }
     },
     "localname": "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHARETables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock": {
     "auth_ref": [
      "r149"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information.",
        "label": "Revenue from External Customers by Products and Services [Table Text Block]",
        "verboseLabel": "Schedule of segment revenue"
       }
      }
     },
     "localname": "ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEnvironmentalExitCostTable": {
     "auth_ref": [
      "r199"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Table setting forth material liabilities for remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal or abandonment of a property as a result of unanticipated contamination of the assets.",
        "label": "Schedule of Environmental Exit Cost [Table]",
        "terseLabel": "Schedule of Environmental Exit Cost [Table]"
       }
      }
     },
     "localname": "ScheduleOfEnvironmentalExitCostTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable": {
     "auth_ref": [
      "r169",
      "r174"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
        "label": "Schedule of Finite-Lived Intangible Assets [Table]",
        "terseLabel": "Schedule of Finite-Lived Intangible Assets [Table]"
       }
      }
     },
     "localname": "ScheduleOfFiniteLivedIntangibleAssetsTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfGoodwillTable": {
     "auth_ref": [
      "r165",
      "r166"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of goodwill and the changes during the year due to acquisition, sale, impairment or for other reasons.",
        "label": "Schedule of Goodwill [Table]",
        "terseLabel": "Schedule of Goodwill [Table]"
       }
      }
     },
     "localname": "ScheduleOfGoodwillTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillRollforwardDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfGoodwillTextBlock": {
     "auth_ref": [
      "r165",
      "r166"
     ],
     "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]",
        "terseLabel": "Goodwill activity"
       }
      }
     },
     "localname": "ScheduleOfGoodwillTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable": {
     "auth_ref": [
      "r178",
      "r182"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of assets, excluding financial assets and goodwill, lacking physical substance and exist in perpetuity.",
        "label": "Schedule of Indefinite-Lived Intangible Assets [Table]",
        "terseLabel": "Schedule of Indefinite-Lived Intangible Assets [Table]"
       }
      }
     },
     "localname": "ScheduleOfIndefiniteLivedIntangibleAssetsTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock": {
     "auth_ref": [
      "r165"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class.",
        "label": "Schedule of Intangible Assets and Goodwill [Table Text Block]",
        "verboseLabel": "Schedule of other intangible assets"
       }
      }
     },
     "localname": "ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfInventoryCurrentTableTextBlock": {
     "auth_ref": [
      "r11",
      "r30",
      "r31",
      "r32"
     ],
     "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]",
        "terseLabel": "Schedule of inventories"
       }
      }
     },
     "localname": "ScheduleOfInventoryCurrentTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/INVENTORIESTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock": {
     "auth_ref": [
      "r202"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented.",
        "label": "Schedule of Maturities of Long-term Debt [Table Text Block]",
        "terseLabel": "Schedule of principal repayments of debt"
       }
      }
     },
     "localname": "ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfOtherAssetsNoncurrentTextBlock": {
     "auth_ref": [
      "r36"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of noncurrent assets.",
        "label": "Schedule of Other Assets, Noncurrent [Table Text Block]",
        "terseLabel": "Other long-term assets"
       }
      }
     },
     "localname": "ScheduleOfOtherAssetsNoncurrentTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/OTHERLONGTERMASSETSTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable": {
     "auth_ref": [
      "r138",
      "r144",
      "r145",
      "r146",
      "r165"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A table disclosing the profit or loss and total assets for each reportable segment of the entity. 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]",
        "terseLabel": "Schedule of Segment Reporting Information, by Segment [Table]"
       }
      }
     },
     "localname": "ScheduleOfSegmentReportingInformationBySegmentTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGRevenuefromExternalCustomersDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock": {
     "auth_ref": [
      "r234",
      "r235",
      "r236"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.",
        "label": "Share-based Payment Arrangement, Activity [Table Text Block]",
        "terseLabel": "Schedule of share-based compensation expense"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationActivityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable": {
     "auth_ref": [
      "r232",
      "r239"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about share-based payment arrangement.",
        "label": "Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]",
        "terseLabel": "Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSNarrativeDetails",
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock": {
     "auth_ref": [
      "r174"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.",
        "label": "Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]",
        "terseLabel": "Schedule of amortization expense on intangible assets"
       }
      }
     },
     "localname": "ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SegmentDomain": {
     "auth_ref": [],
     "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]",
        "terseLabel": "Segments [Domain]"
       }
      }
     },
     "localname": "SegmentDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillRollforwardDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGRevenuefromExternalCustomersDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SegmentReportingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Segment Reporting [Abstract]",
        "terseLabel": "Segment Reporting [Abstract]"
       }
      }
     },
     "localname": "SegmentReportingAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_SegmentReportingDisclosureTextBlock": {
     "auth_ref": [
      "r150"
     ],
     "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]",
        "verboseLabel": "SEGMENT REPORTING"
       }
      }
     },
     "localname": "SegmentReportingDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTING"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SegmentReportingInformationLineItems": {
     "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": "Segment Reporting Information [Line Items]",
        "terseLabel": "Segment Reporting Information [Line Items]"
       }
      }
     },
     "localname": "SegmentReportingInformationLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGRevenuefromExternalCustomersDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SellingGeneralAndAdministrativeExpense": {
     "auth_ref": [
      "r82",
      "r157"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME": {
       "order": 1.0,
       "parentTag": "us-gaap_OperatingExpenses",
       "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 Expense",
        "terseLabel": "Selling, general and administrative"
       }
      }
     },
     "localname": "SellingGeneralAndAdministrativeExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SellingGeneralAndAdministrativeExpensesMember": {
     "auth_ref": [
      "r85"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing selling, general and administrative expense.",
        "label": "Selling, General and Administrative Expenses [Member]",
        "terseLabel": "Selling, general and administrative"
       }
      }
     },
     "localname": "SellingGeneralAndAdministrativeExpensesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShareBasedCompensation": {
     "auth_ref": [
      "r100"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "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": "Share-based Payment Arrangement, Noncash Expense",
        "terseLabel": "Share-based compensation expense"
       }
      }
     },
     "localname": "ShareBasedCompensation",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems": {
     "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": "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSNarrativeDetails",
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSShareBasedCompensationExpenseDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain": {
     "auth_ref": [
      "r230",
      "r233"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Award under share-based payment arrangement.",
        "label": "Award Type [Domain]",
        "terseLabel": "Award Type [Domain]"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SHAREBASEDCOMPENSATIONPLANSNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShortMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicates the sale of a borrowed security or written option.",
        "label": "Short [Member]",
        "terseLabel": "Sell"
       }
      }
     },
     "localname": "ShortMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShortTermBorrowings": {
     "auth_ref": [
      "r14",
      "r350",
      "r363"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 4.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.",
        "label": "Short-term Debt",
        "terseLabel": "Short-term debt",
        "verboseLabel": "Revolving credit facility, outstanding"
       }
      }
     },
     "localname": "ShortTermBorrowings",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SignificantAccountingPoliciesTextBlock": {
     "auth_ref": [
      "r115"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for all significant accounting policies of the reporting entity.",
        "label": "Significant Accounting Policies [Text Block]",
        "verboseLabel": "SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS"
       }
      }
     },
     "localname": "SignificantAccountingPoliciesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTS"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_StatementBusinessSegmentsAxis": {
     "auth_ref": [
      "r0",
      "r144",
      "r165",
      "r187",
      "r192",
      "r193",
      "r372"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by business segments.",
        "label": "Segments [Axis]",
        "terseLabel": "Segments [Axis]"
       }
      }
     },
     "localname": "StatementBusinessSegmentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONNarrativeDetails",
      "http://www.cabotcmp.com/role/GOODWILLANDOTHERINTANGIBLEASSETSGoodwillRollforwardDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGCapitalExpendituresDetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGReconciliationfromSegmentAdjustedEBITDADetails",
      "http://www.cabotcmp.com/role/SEGMENTREPORTINGRevenuefromExternalCustomersDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementEquityComponentsAxis": {
     "auth_ref": [
      "r48",
      "r206"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by component of equity.",
        "label": "Equity Components [Axis]",
        "terseLabel": "Equity Components [Axis]"
       }
      }
     },
     "localname": "StatementEquityComponentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY",
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails"
     ],
     "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]",
        "terseLabel": "Statement [Line Items]"
       }
      }
     },
     "localname": "StatementLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfCashFlowsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Cash Flows [Abstract]",
        "terseLabel": "Statement of Cash Flows [Abstract]"
       }
      }
     },
     "localname": "StatementOfCashFlowsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfFinancialPositionAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Financial Position [Abstract]",
        "terseLabel": "Statement of Financial Position [Abstract]"
       }
      }
     },
     "localname": "StatementOfFinancialPositionAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Comprehensive Income [Abstract]",
        "terseLabel": "Statement of Comprehensive Income [Abstract]"
       }
      }
     },
     "localname": "StatementOfIncomeAndComprehensiveIncomeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfStockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Stockholders' Equity [Abstract]",
        "terseLabel": "Statement of Stockholders' Equity [Abstract]"
       }
      }
     },
     "localname": "StatementOfStockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementTable": {
     "auth_ref": [],
     "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]",
        "terseLabel": "Statement [Table]"
       }
      }
     },
     "localname": "StatementTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueAcquisitions": {
     "auth_ref": [
      "r48",
      "r206",
      "r211"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Value of stock issued pursuant to acquisitions during the period.",
        "label": "Stock Issued During Period, Value, Acquisitions",
        "terseLabel": "Issuance of common stock in connection with acquisition of KMG Chemicals, Inc."
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueAcquisitions",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan": {
     "auth_ref": [
      "r18",
      "r19",
      "r206",
      "r211"
     ],
     "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": "Stock Issued During Period, Value, Employee Stock Purchase Plan",
        "terseLabel": "Issuance of Cabot Microelectronics stock under Employee Stock Purchase Plan"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueEmployeeStockPurchasePlan",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures": {
     "auth_ref": [
      "r206",
      "r211"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.",
        "label": "Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures",
        "terseLabel": "Issuance of Cabot Microelectronics restricted stock under Deposit Share Program"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised": {
     "auth_ref": [
      "r48",
      "r206",
      "r211"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Value of stock issued as a result of the exercise of stock options.",
        "label": "Stock Issued During Period, Value, Stock Options Exercised",
        "terseLabel": "Exercise of stock options"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueStockOptionsExercised",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquity": {
     "auth_ref": [
      "r19",
      "r23",
      "r24",
      "r154"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "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": "Stockholders' Equity Attributable to Parent",
        "periodEndLabel": "Balance at end of period",
        "periodStartLabel": "Balance at beginning of period",
        "totalLabel": "Total stockholders\u2019 equity"
       }
      }
     },
     "localname": "StockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails",
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Stockholders' Equity Attributable to Parent [Abstract]",
        "terseLabel": "Stockholders\u2019 equity:"
       }
      }
     },
     "localname": "StockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect": {
     "auth_ref": [
      "r62"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act.",
        "label": "Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect",
        "terseLabel": "Effect of the adoption of the stranded tax effect accounting standards"
       }
      }
     },
     "localname": "TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails",
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY",
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TechnologyBasedIntangibleAssetsMember": {
     "auth_ref": [
      "r268"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Technology-based intangible assets, including, but not limited to, patented technology, unpatented technology, and developed technology rights.",
        "label": "Technology-Based Intangible Assets [Member]",
        "terseLabel": "Technology and know-how"
       }
      }
     },
     "localname": "TechnologyBasedIntangibleAssetsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/BUSINESSCOMBINATIONIdentifiableIntangibleAssetsAcquiredDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TreasuryStockMember": {
     "auth_ref": [
      "r47",
      "r212"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Shares of an entity that have been repurchased by the entity. This stock has no voting rights and receives no dividends. Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer.",
        "label": "Treasury Stock [Member]",
        "terseLabel": "Treasury Stock"
       }
      }
     },
     "localname": "TreasuryStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TreasuryStockShares": {
     "auth_ref": [
      "r47",
      "r212"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.",
        "label": "Treasury Stock, Shares",
        "terseLabel": "Treasury stock (in shares)"
       }
      }
     },
     "localname": "TreasuryStockShares",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETSParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_TreasuryStockValue": {
     "auth_ref": [
      "r47",
      "r212",
      "r213"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.",
        "label": "Treasury Stock, Value",
        "negatedLabel": "Treasury stock at cost, 10,672,652 shares at March\u00a031, 2020, and 10,491,252 shares at September\u00a030, 2019"
       }
      }
     },
     "localname": "TreasuryStockValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TreasuryStockValueAcquiredCostMethod": {
     "auth_ref": [
      "r206",
      "r211",
      "r212"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.",
        "label": "Treasury Stock, Value, Acquired, Cost Method",
        "negatedLabel": "Repurchases of common stock under Share Repurchase Program, at cost"
       }
      }
     },
     "localname": "TreasuryStockValueAcquiredCostMethod",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINSTOCKHOLDERSEQUITY"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TypeOfAdoptionMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Adoption and early adoption of sources of change to generally accepted accounting principles (GAAP) in the United States. The FASB released the FASB Accounting Standards Codification as the authoritative source of literature effective for interim and annual periods ending after September 15, 2009. As part of the Codification process, the FASB issues Accounting Standards Updates to amend the Codification but otherwise the Accounting Standards Updates are not authoritative in their own right. All previous accounting standards (such as FASB Statements of Financial Accounting Standards, FASB Interpretations, FASB Staff Positions, Emerging Issues Task Force Consensuses, other pronouncements of the FASB or other designated bodies, or other forms of GAAP are considered accounting pronouncements) were superseded upon the adoption of the Codification. For an interim period, references to the superseded standards are included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.",
        "label": "Type of Adoption [Domain]",
        "terseLabel": "Type of Adoption [Domain]"
       }
      }
     },
     "localname": "TypeOfAdoptionMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain": {
     "auth_ref": [
      "r195"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "General description of the goods or services to be purchased from the counterparty to the unconditional purchase arrangement.",
        "label": "Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain]",
        "terseLabel": "Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain]"
       }
      }
     },
     "localname": "UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_UnrecordedUnconditionalPurchaseObligationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]",
        "terseLabel": "Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]"
       }
      }
     },
     "localname": "UnrecordedUnconditionalPurchaseObligationAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/COMMITMENTSANDCONTINGENCIESDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_UseOfEstimates": {
     "auth_ref": [
      "r130",
      "r131",
      "r132",
      "r133",
      "r134",
      "r135",
      "r136"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.",
        "label": "Use of Estimates, Policy [Policy Text Block]",
        "terseLabel": "USE OF ESTIMATES"
       }
      }
     },
     "localname": "UseOfEstimates",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTACCOUNTINGPRONOUNCEMENTSPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_VariableRateAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of variable rate.",
        "label": "Variable Rate [Axis]",
        "terseLabel": "Variable Rate [Axis]"
       }
      }
     },
     "localname": "VariableRateAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "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]",
        "terseLabel": "Variable Rate [Domain]"
       }
      }
     },
     "localname": "VariableRateDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/DEBTNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment": {
     "auth_ref": [
      "r125"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails": {
       "order": 2.0,
       "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": "Weighted Average Number Diluted Shares Outstanding Adjustment",
        "terseLabel": "Weighted average effect of dilutive securities (in shares)"
       }
      }
     },
     "localname": "WeightedAverageNumberDilutedSharesOutstandingAdjustment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]",
        "verboseLabel": "Weighted average effect of dilutive securities"
       }
      }
     },
     "localname": "WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding": {
     "auth_ref": [
      "r121",
      "r125"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails": {
       "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": "Weighted Average Number of Shares Outstanding, Diluted",
        "totalLabel": "Diluted weighted average common shares (Denominator for diluted calculation) (in shares)",
        "verboseLabel": "Weighted average diluted shares outstanding (in shares)"
       }
      }
     },
     "localname": "WeightedAverageNumberOfDilutedSharesOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME",
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic": {
     "auth_ref": [
      "r119",
      "r125"
     ],
     "calculation": {
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails": {
       "order": 1.0,
       "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 Number of Shares Outstanding, Basic",
        "terseLabel": "Weighted average common shares (Denominator for basis calculation) (in shares)",
        "verboseLabel": "Weighted average basic shares outstanding (in shares)"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesOutstandingBasic",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/CONSOLIDATEDSTATEMENTSOFINCOME",
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Weighted Average Number of Shares Outstanding, Basic [Abstract]",
        "verboseLabel": "Denominator:"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesOutstandingBasicAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.cabotcmp.com/role/EARNINGSPERSHAREDetails"
     ],
     "xbrltype": "stringItemType"
    }
   },
   "unitCount": 7
  }
 },
 "std_ref": {
  "r0": {
   "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"
  },
  "r1": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "205",
   "URI": "http://asc.fasb.org/topic&trid=2122149"
  },
  "r10": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e7018-107765"
  },
  "r100": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r101": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r102": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r103": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585"
  },
  "r104": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586"
  },
  "r105": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586"
  },
  "r106": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586"
  },
  "r107": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586"
  },
  "r108": {
   "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=26873400&loc=d3e23780-122690"
  },
  "r109": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(e),(f))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r11": {
   "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"
  },
  "r110": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(f))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r111": {
   "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=26873400&loc=d3e23780-122690"
  },
  "r112": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(h)(2))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r113": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(n)(2))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r114": {
   "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=26873400&loc=d3e24072-122690"
  },
  "r115": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "235",
   "URI": "http://asc.fasb.org/topic&trid=2122369"
  },
  "r116": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r117": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794"
  },
  "r118": {
   "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"
  },
  "r119": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256"
  },
  "r12": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r120": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1377-109256"
  },
  "r121": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256"
  },
  "r122": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1252-109256"
  },
  "r123": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "60B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256"
  },
  "r124": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256"
  },
  "r125": {
   "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"
  },
  "r126": {
   "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"
  },
  "r127": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
  },
  "r128": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "52",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117327953&loc=d3e4984-109258"
  },
  "r129": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "260",
   "URI": "http://asc.fasb.org/topic&trid=2144383"
  },
  "r13": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r130": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
  },
  "r131": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
  },
  "r132": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6161-108592"
  },
  "r133": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6191-108592"
  },
  "r134": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6061-108592"
  },
  "r135": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6132-108592"
  },
  "r136": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6143-108592"
  },
  "r137": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "275",
   "URI": "http://asc.fasb.org/topic&trid=2134479"
  },
  "r138": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599"
  },
  "r139": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r14": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r140": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r141": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r142": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r143": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r144": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r145": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599"
  },
  "r146": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599"
  },
  "r147": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599"
  },
  "r148": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8475-108599"
  },
  "r149": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "40",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599"
  },
  "r15": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r150": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "280",
   "URI": "http://asc.fasb.org/topic&trid=2134510"
  },
  "r151": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522"
  },
  "r152": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4531-111522"
  },
  "r153": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524"
  },
  "r154": {
   "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"
  },
  "r155": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446"
  },
  "r156": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r157": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "30",
   "SubTopic": "10",
   "Topic": "330",
   "URI": "http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311"
  },
  "r158": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "10",
   "Topic": "330",
   "URI": "http://asc.fasb.org/extlink&oid=116846819&loc=d3e3927-108312"
  },
  "r159": {
   "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"
  },
  "r16": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r160": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "330",
   "URI": "http://asc.fasb.org/topic&trid=2126998"
  },
  "r161": {
   "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"
  },
  "r162": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975"
  },
  "r163": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(f)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
  },
  "r164": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
  },
  "r165": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
  },
  "r166": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267"
  },
  "r167": {
   "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"
  },
  "r168": {
   "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"
  },
  "r169": {
   "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"
  },
  "r17": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r170": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)(3)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
  },
  "r171": {
   "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"
  },
  "r172": {
   "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"
  },
  "r173": {
   "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"
  },
  "r174": {
   "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"
  },
  "r175": {
   "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"
  },
  "r176": {
   "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"
  },
  "r177": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)(3)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r178": {
   "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"
  },
  "r179": {
   "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"
  },
  "r18": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r180": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(d)(2)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r181": {
   "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"
  },
  "r182": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b),(d)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275"
  },
  "r183": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "350",
   "URI": "http://asc.fasb.org/topic&trid=2144416"
  },
  "r184": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r185": {
   "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"
  },
  "r186": {
   "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"
  },
  "r187": {
   "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"
  },
  "r188": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848"
  },
  "r189": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(3)",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849"
  },
  "r19": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r190": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=109237650&loc=d3e13064-110858"
  },
  "r191": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859"
  },
  "r192": {
   "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"
  },
  "r193": {
   "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"
  },
  "r194": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "440",
   "URI": "http://asc.fasb.org/extlink&oid=77896938&loc=d3e25287-109308"
  },
  "r195": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "440",
   "URI": "http://asc.fasb.org/extlink&oid=77896938&loc=d3e25383-109308"
  },
  "r196": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "440",
   "URI": "http://asc.fasb.org/topic&trid=2144648"
  },
  "r197": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349"
  },
  "r198": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=116646759&loc=d3e15243-108350"
  },
  "r199": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "20",
   "Subparagraph": "(SAB Topic 5.Y.Q4)",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751"
  },
  "r2": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
  },
  "r20": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r200": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "450",
   "URI": "http://asc.fasb.org/topic&trid=2127136"
  },
  "r201": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248"
  },
  "r202": {
   "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"
  },
  "r203": {
   "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"
  },
  "r204": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(3)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870"
  },
  "r205": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "470",
   "URI": "http://asc.fasb.org/topic&trid=2208564"
  },
  "r206": {
   "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"
  },
  "r207": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644"
  },
  "r208": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644"
  },
  "r209": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644"
  },
  "r21": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r210": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644"
  },
  "r211": {
   "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=27012166&loc=d3e187085-122770"
  },
  "r212": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655"
  },
  "r213": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656"
  },
  "r214": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044"
  },
  "r215": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044"
  },
  "r216": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044"
  },
  "r217": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045"
  },
  "r218": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045"
  },
  "r219": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(1)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045"
  },
  "r22": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r220": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045"
  },
  "r221": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045"
  },
  "r222": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045"
  },
  "r223": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045"
  },
  "r224": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "606",
   "URI": "http://asc.fasb.org/topic&trid=49130388"
  },
  "r225": {
   "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"
  },
  "r226": {
   "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"
  },
  "r227": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(j)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r228": {
   "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"
  },
  "r229": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116855982&loc=d3e4534-113899"
  },
  "r23": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r230": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
  },
  "r231": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
  },
  "r232": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
  },
  "r233": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a),(g)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r234": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r235": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r236": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r237": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r238": {
   "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=116856206&loc=d3e5070-113901"
  },
  "r239": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r24": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r240": {
   "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"
  },
  "r241": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11149-113907"
  },
  "r242": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11178-113907"
  },
  "r243": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "718",
   "URI": "http://asc.fasb.org/topic&trid=2228938"
  },
  "r244": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "720",
   "URI": "http://asc.fasb.org/extlink&oid=6419918&loc=d3e35281-107843"
  },
  "r245": {
   "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"
  },
  "r246": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=116821951&loc=d3e31917-109318"
  },
  "r247": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=116821951&loc=d3e31931-109318"
  },
  "r248": {
   "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"
  },
  "r249": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319"
  },
  "r25": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r250": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319"
  },
  "r251": {
   "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"
  },
  "r252": {
   "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"
  },
  "r253": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e39076-109324"
  },
  "r254": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324"
  },
  "r255": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "740",
   "URI": "http://asc.fasb.org/topic&trid=2144680"
  },
  "r256": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "23",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "10",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460"
  },
  "r257": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
  },
  "r258": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(g)(1)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
  },
  "r259": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)(1)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
  },
  "r26": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(4)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r260": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)(2)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
  },
  "r261": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)(3)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
  },
  "r262": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)(4)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
  },
  "r263": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
  },
  "r264": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463"
  },
  "r265": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "37",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464"
  },
  "r266": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472"
  },
  "r267": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=116869197&loc=d3e4922-128472"
  },
  "r268": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5227-128473"
  },
  "r269": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "38",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5504-128473"
  },
  "r27": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r270": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "30",
   "SubTopic": "30",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477"
  },
  "r271": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "30",
   "SubTopic": "30",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477"
  },
  "r272": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479"
  },
  "r273": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)(1)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479"
  },
  "r274": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)(4)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479"
  },
  "r275": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "805",
   "URI": "http://asc.fasb.org/topic&trid=2303972"
  },
  "r276": {
   "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"
  },
  "r277": {
   "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"
  },
  "r278": {
   "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"
  },
  "r279": {
   "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"
  },
  "r28": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r280": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5579240-113959"
  },
  "r281": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959"
  },
  "r282": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959"
  },
  "r283": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959"
  },
  "r284": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41620-113959"
  },
  "r285": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959"
  },
  "r286": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959"
  },
  "r287": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959"
  },
  "r288": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959"
  },
  "r289": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a),(c)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
  },
  "r29": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r290": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
  },
  "r291": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
  },
  "r292": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
  },
  "r293": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959"
  },
  "r294": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959"
  },
  "r295": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(2)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959"
  },
  "r296": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959"
  },
  "r297": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4E",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959"
  },
  "r298": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41641-113959"
  },
  "r299": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959"
  },
  "r3": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
  },
  "r30": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r300": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "182",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=116861445&loc=SL5629052-113961"
  },
  "r301": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "25",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986"
  },
  "r302": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=112277219&loc=d3e80845-113994"
  },
  "r303": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "815",
   "URI": "http://asc.fasb.org/topic&trid=2229140"
  },
  "r304": {
   "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"
  },
  "r305": {
   "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"
  },
  "r306": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bb)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r307": {
   "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"
  },
  "r308": {
   "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"
  },
  "r309": {
   "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"
  },
  "r31": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r310": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258"
  },
  "r311": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258"
  },
  "r312": {
   "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"
  },
  "r313": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611"
  },
  "r314": {
   "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"
  },
  "r315": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894"
  },
  "r316": {
   "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"
  },
  "r317": {
   "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"
  },
  "r318": {
   "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"
  },
  "r319": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399"
  },
  "r32": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r320": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399"
  },
  "r321": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399"
  },
  "r322": {
   "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"
  },
  "r323": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694"
  },
  "r324": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "40",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(Note 1,3)",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697"
  },
  "r325": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "40",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(Note 3)",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697"
  },
  "r326": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717"
  },
  "r327": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717"
  },
  "r328": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717"
  },
  "r329": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984"
  },
  "r33": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(7))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r330": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977"
  },
  "r331": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977"
  },
  "r332": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977"
  },
  "r333": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977"
  },
  "r334": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r335": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(1)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r336": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(2)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r337": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(3)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r338": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(4)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r339": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r34": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r340": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980"
  },
  "r341": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "53",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971"
  },
  "r342": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/subtopic&trid=77888251"
  },
  "r343": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r344": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r345": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r346": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r347": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719"
  },
  "r348": {
   "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"
  },
  "r349": {
   "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=6876686&loc=d3e534808-122878"
  },
  "r35": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r350": {
   "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=6876686&loc=d3e534808-122878"
  },
  "r351": {
   "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=6876686&loc=d3e534808-122878"
  },
  "r352": {
   "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=6876686&loc=d3e534808-122878"
  },
  "r353": {
   "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=6876686&loc=d3e534808-122878"
  },
  "r354": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.17)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r355": {
   "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=116637391&loc=SL114874048-224260"
  },
  "r356": {
   "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=116637391&loc=SL114874048-224260"
  },
  "r357": {
   "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=116637391&loc=SL114874048-224260"
  },
  "r358": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "405",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817"
  },
  "r359": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "470",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
  },
  "r36": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r360": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r361": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r362": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r363": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(16)(a)(1))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r364": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r365": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r366": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r367": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r368": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.(a),19)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r369": {
   "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=116637232&loc=SL114874131-224263"
  },
  "r37": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r370": {
   "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=116637232&loc=SL114874131-224263"
  },
  "r371": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437"
  },
  "r372": {
   "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"
  },
  "r373": {
   "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"
  },
  "r374": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b"
  },
  "r375": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "d1-1"
  },
  "r376": {
   "Name": "Form 10-Q",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-13"
  },
  "r377": {
   "Name": "Forms 10-K, 10-Q, 20-F",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-1-"
  },
  "r378": {
   "Name": "Regulation 12B",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r379": {
   "Name": "Regulation S-T",
   "Number": "232",
   "Publisher": "SEC",
   "Section": "405"
  },
  "r38": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(a),20,24)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r39": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r4": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
  },
  "r40": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r41": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r42": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r43": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r44": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r45": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r46": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.25)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r47": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.29,30)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r48": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r49": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r5": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
  },
  "r50": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r51": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r52": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r53": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313"
  },
  "r54": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313"
  },
  "r55": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a),(b),(c)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r56": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r57": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(i),(j),(k)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r58": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(i-k)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r59": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r6": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6801-107765"
  },
  "r60": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580"
  },
  "r61": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580"
  },
  "r62": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL116659650-108580"
  },
  "r63": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580"
  },
  "r64": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580"
  },
  "r65": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724391-108580"
  },
  "r66": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580"
  },
  "r67": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
  },
  "r68": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
  },
  "r69": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
  },
  "r7": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6904-107765"
  },
  "r70": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580"
  },
  "r71": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580"
  },
  "r72": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e557-108580"
  },
  "r73": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581"
  },
  "r74": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116657190&loc=SL116659633-172590"
  },
  "r75": {
   "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=116634182&loc=SL114868664-224227"
  },
  "r76": {
   "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=116634182&loc=SL114868664-224227"
  },
  "r77": {
   "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=116634182&loc=SL114868664-224227"
  },
  "r78": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(5))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r79": {
   "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=116634182&loc=SL114868664-224227"
  },
  "r8": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6911-107765"
  },
  "r80": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.1,2)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r81": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.2(a),(d))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r82": {
   "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=116634182&loc=SL114868664-224227"
  },
  "r83": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.7(b))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r84": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.9)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r85": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r86": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "220",
   "URI": "http://asc.fasb.org/topic&trid=2134417"
  },
  "r87": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
  },
  "r88": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
  },
  "r89": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
  },
  "r9": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6935-107765"
  },
  "r90": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
  },
  "r91": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
  },
  "r92": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
  },
  "r93": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
  },
  "r94": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
  },
  "r95": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
  },
  "r96": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
  },
  "r97": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21C",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=SL94080552-108585"
  },
  "r98": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "24",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585"
  },
  "r99": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
  }
 },
 "version": "2.1"
}
