{
 "instance": {
  "gbnh-20211231x20f.htm": {
   "axisCustom": 3,
   "axisStandard": 19,
   "contextCount": 330,
   "dts": {
    "calculationLink": {
     "local": [
      "gbnh-20211231_cal.xml"
     ]
    },
    "definitionLink": {
     "local": [
      "gbnh-20211231_def.xml"
     ]
    },
    "inline": {
     "local": [
      "gbnh-20211231x20f.htm"
     ]
    },
    "labelLink": {
     "local": [
      "gbnh-20211231_lab.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "gbnh-20211231_pre.xml"
     ]
    },
    "schema": {
     "local": [
      "gbnh-20211231.xsd"
     ],
     "remote": [
      "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/2005/xbrldt-2005.xsd",
      "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
      "http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd",
      "http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/arcrole/esma-arcrole-2018-11-21.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/reference-2009-12-16.xsd",
      "http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd",
      "https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd",
      "https://www.xbrl.org/dtr/type/2020-01-21/types.xsd",
      "https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd",
      "https://xbrl.fasb.org/srt/2021/elts/srt-roles-2021-01-31.xsd",
      "https://xbrl.fasb.org/srt/2021/elts/srt-types-2021-01-31.xsd",
      "https://xbrl.fasb.org/us-gaap/2021/elts/us-roles-2021-01-31.xsd",
      "https://xbrl.sec.gov/country/2021/country-2021.xsd",
      "https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd"
     ]
    }
   },
   "elementCount": 606,
   "entityCount": 1,
   "hidden": {
    "http://www.greenbrooktms.com/20211231": 10,
    "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full": 4,
    "http://xbrl.sec.gov/dei/2021q4": 5,
    "total": 19
   },
   "keyCustom": 128,
   "keyStandard": 268,
   "memberCustom": 45,
   "memberStandard": 30,
   "nsprefix": "gbnh",
   "nsuri": "http://www.greenbrooktms.com/20211231",
   "report": {
    "R1": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "document",
     "isDefault": "true",
     "longName": "00090 - Document - Document and Entity Information",
     "role": "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation",
     "shortName": "Document and Entity Information",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R10": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfBusinessCombinationsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "10501 - Disclosure - Business acquisitions",
     "role": "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitions",
     "shortName": "Business acquisitions",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfBusinessCombinationsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R11": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "10601 - Disclosure - Property, plant and equipment",
     "role": "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipment",
     "shortName": "Property, plant and equipment",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R12": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfIntangibleAssetsAndGoodwillExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "10701 - Disclosure - Intangible assets",
     "role": "http://www.greenbrooktms.com/role/DisclosureIntangibleAssets",
     "shortName": "Intangible assets",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfIntangibleAssetsAndGoodwillExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R13": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfLeasesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "10801 - Disclosure - Right-of-use assets and leases liabilities",
     "role": "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilities",
     "shortName": "Right-of-use assets and leases liabilities",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfLeasesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R14": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "10901 - Disclosure - Accounts payable and accrued liabilities",
     "role": "http://www.greenbrooktms.com/role/DisclosureAccountsPayableAndAccruedLiabilities",
     "shortName": "Accounts payable and accrued liabilities",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R15": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfBorrowingsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "11001 - Disclosure - Loans payable",
     "role": "http://www.greenbrooktms.com/role/DisclosureLoansPayable",
     "shortName": "Loans payable",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfBorrowingsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R16": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfGovernmentGrantsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "11101 - Disclosure - Deferred grant income",
     "role": "http://www.greenbrooktms.com/role/DisclosureDeferredGrantIncome",
     "shortName": "Deferred grant income",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfGovernmentGrantsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R17": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfOtherLiabilitiesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "11201 - Disclosure - Other payables",
     "role": "http://www.greenbrooktms.com/role/DisclosureOtherPayables",
     "shortName": "Other payables",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfOtherLiabilitiesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R18": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfDeferredAndContingentConsiderationExplanatoryTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "11301 - Disclosure - Deferred and contingent consideration",
     "role": "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsideration",
     "shortName": "Deferred and contingent consideration",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfDeferredAndContingentConsiderationExplanatoryTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R19": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "11401 - Disclosure - Common shares",
     "role": "http://www.greenbrooktms.com/role/DisclosureCommonShares",
     "shortName": "Common shares",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R2": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:Cash",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "00100 - Statement - Consolidated Statements of Financial Position",
     "role": "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition",
     "shortName": "Consolidated Statements of Financial Position",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:RestrictedCashAndCashEquivalents",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R20": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfShareBasedPaymentAndWarrantsArrangementsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "11501 - Disclosure - Contributed surplus",
     "role": "http://www.greenbrooktms.com/role/DisclosureContributedSurplus",
     "shortName": "Contributed surplus",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfShareBasedPaymentAndWarrantsArrangementsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R21": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfContingentLiabilitiesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "11601 - Disclosure - Contingencies",
     "role": "http://www.greenbrooktms.com/role/DisclosureContingencies",
     "shortName": "Contingencies",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfContingentLiabilitiesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R22": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfEmployeeBenefitsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "11701 - Disclosure - Pensions",
     "role": "http://www.greenbrooktms.com/role/DisclosurePensions",
     "shortName": "Pensions",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfEmployeeBenefitsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R23": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfIncomeTaxExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "11801 - Disclosure - Income taxes",
     "role": "http://www.greenbrooktms.com/role/DisclosureIncomeTaxes",
     "shortName": "Income taxes",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfIncomeTaxExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R24": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfFinancialInstrumentsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "11901 - Disclosure - Risk management arising from financial instruments",
     "role": "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstruments",
     "shortName": "Risk management arising from financial instruments",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfFinancialInstrumentsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R25": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DescriptionOfManagingLiquidityRisk",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "12001 - Disclosure - Capital management",
     "role": "http://www.greenbrooktms.com/role/DisclosureCapitalManagement",
     "shortName": "Capital management",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DescriptionOfManagingLiquidityRisk",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R26": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfRelatedPartyExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "12101 - Disclosure - Related party transactions",
     "role": "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactions",
     "shortName": "Related party transactions",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfRelatedPartyExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R27": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfEarningsPerShareExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "12201 - Disclosure - Basic and diluted loss per share",
     "role": "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShare",
     "shortName": "Basic and diluted loss per share",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfEarningsPerShareExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R28": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "12301 - Disclosure - Non-controlling interest",
     "role": "http://www.greenbrooktms.com/role/DisclosureNonControllingInterest",
     "shortName": "Non-controlling interest",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R29": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfExpensesByNatureExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "12401 - Disclosure - Expenses by nature",
     "role": "http://www.greenbrooktms.com/role/DisclosureExpensesByNature",
     "shortName": "Expenses by nature",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfExpensesByNatureExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R3": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:RevenueFromContractsWithCustomers",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "00200 - Statement - Consolidated Statements of Net Loss and Comprehensive Loss",
     "role": "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss",
     "shortName": "Consolidated Statements of Net Loss and Comprehensive Loss",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "lang": null,
      "name": "gbnh:CostOfSalesExcludingDepreciation",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R30": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "20302 - Disclosure - Significant accounting policies (Policies)",
     "role": "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies",
     "shortName": "Significant accounting policies (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R31": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfDepreciationAndAmortisationExpenseExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "30303 - Disclosure - Significant accounting policies (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesTables",
     "shortName": "Significant accounting policies (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfDepreciationAndAmortisationExpenseExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R32": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_ifrs-full_BusinessCombinationsAxis_gbnh_AchieveTmsWestAcquisitionMember_ldb_Ao_cSEaP3eqV25603g",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "30503 - Disclosure - Business acquisitions (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsTables",
     "shortName": "Business acquisitions (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_ifrs-full_BusinessCombinationsAxis_gbnh_AchieveTmsWestAcquisitionMember_ldb_Ao_cSEaP3eqV25603g",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R33": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "30603 - Disclosure - Property, plant and equipment (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentTables",
     "shortName": "Property, plant and equipment (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R34": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfIntangibleAssetsAndGoodwillExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "30703 - Disclosure - Intangible assets and goodwill (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAndGoodwillTables",
     "shortName": "Intangible assets and goodwill (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfIntangibleAssetsAndGoodwillExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R35": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfLeasesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "30803 - Disclosure - Right-of-use assets and leases liabilities (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesTables",
     "shortName": "Right-of-use assets and leases liabilities (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfLeasesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R36": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:ScheduleOfTradeAndOtherPayablesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "30903 - Disclosure - Accounts payable and accrued liabilities (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesTables",
     "shortName": "Accounts payable and accrued liabilities (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:ScheduleOfTradeAndOtherPayablesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R37": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfBorrowingsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfMaturityAnalysisOfUndiscountedContractualCashFlowsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "31003 - Disclosure - Loans payable (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureLoansPayableTables",
     "shortName": "Loans payable (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfBorrowingsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfMaturityAnalysisOfUndiscountedContractualCashFlowsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R38": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfGovernmentGrantsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfDetailedInformationAboutDeferredGrantIncomeExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "31103 - Disclosure - Deferred grant income (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureDeferredGrantIncomeTables",
     "shortName": "Deferred grant income (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfGovernmentGrantsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfDetailedInformationAboutDeferredGrantIncomeExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R39": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfOtherLiabilitiesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:ScheduleOfWarrantsOrRightsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "31203 - Disclosure - Other payables (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureOtherPayablesTables",
     "shortName": "Other payables (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfOtherLiabilitiesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:ScheduleOfWarrantsOrRightsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R4": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2018_ifrs-full_ComponentsOfEquityAxis_ifrs-full_IssuedCapitalMember_eo2J1eaIrUm72ogIDbFecA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:Equity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "00300 - Statement - Consolidated Statements of Changes in Equity",
     "role": "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity",
     "shortName": "Consolidated Statements of Changes in Equity",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2018_ifrs-full_ComponentsOfEquityAxis_ifrs-full_IssuedCapitalMember_eo2J1eaIrUm72ogIDbFecA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:Equity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R40": {
     "firstAnchor": {
      "ancestors": [
       "gbnh:DisclosureOfDeferredAndContingentConsiderationExplanatoryTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfContingentLiabilitiesInBusinessCombinationExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "31303 - Disclosure - Deferred and contingent consideration (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationTables",
     "shortName": "Deferred and contingent consideration (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "gbnh:DisclosureOfDeferredAndContingentConsiderationExplanatoryTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfContingentLiabilitiesInBusinessCombinationExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R41": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfDetailedInformationAboutShareCapitalTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "31403 - Disclosure - Common shares (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureCommonSharesTables",
     "shortName": "Common shares (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfDetailedInformationAboutShareCapitalTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R42": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "31503 - Disclosure - Contributed surplus (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureContributedSurplusTables",
     "shortName": "Contributed surplus (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R43": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfIncomeTaxExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:IfrsScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "31803 - Disclosure - Income taxes (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesTables",
     "shortName": "Income taxes (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfIncomeTaxExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:IfrsScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R44": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "31903 - Disclosure - Risk management arising from financial instruments (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsTables",
     "shortName": "Risk management arising from financial instruments (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R45": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfRelatedPartyExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "32103 - Disclosure - Related party transactions (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsTables",
     "shortName": "Related party transactions (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfRelatedPartyExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R46": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfEarningsPerShareExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:EarningsPerShareExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "32203 - Disclosure - Basic and diluted loss per share (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShareTables",
     "shortName": "Basic and diluted loss per share (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfEarningsPerShareExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:EarningsPerShareExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R47": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "32303 - Disclosure - Non-controlling interest (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestTables",
     "shortName": "Non-controlling interest (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R48": {
     "firstAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfExpensesByNatureExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfOtherRegionalAndCenterSupportCostsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "32403 - Disclosure - Expenses by nature (Tables)",
     "role": "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureTables",
     "shortName": "Expenses by nature (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ifrs-full:DisclosureOfExpensesByNatureExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfOtherRegionalAndCenterSupportCostsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R49": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:ProceedsFromIssuingShares",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40201 - Disclosure - Basis of preparation - Going concern (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
     "shortName": "Basis of preparation - Going concern (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R5": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:ProfitLoss",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "00400 - Statement - Consolidated Statements of Cash Flows",
     "role": "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows",
     "shortName": "Consolidated Statements of Cash Flows",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:AdjustmentsForAmortisationExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R50": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_2_1_2021_To_2_1_2021_c3ueTbBy1ESezyxODlERjw",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "gbnh:DecreasedInNumberOfSharesIssuedAndOutstanding",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_shares_Z2ipPRZaXkyV90L33GwBiA",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40202 - Disclosure - Basis of preparation - Additional information (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationAdditionalInformationDetails",
     "shortName": "Basis of preparation - Additional information (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_2_1_2021_To_2_1_2021_c3ueTbBy1ESezyxODlERjw",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "gbnh:DecreasedInNumberOfSharesIssuedAndOutstanding",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_shares_Z2ipPRZaXkyV90L33GwBiA",
      "xsiNil": "false"
     }
    },
    "R51": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfDepreciationAndAmortisationExpenseExplanatory",
       "ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_ifrs-full_ComputerEquipmentMember_ikUjHgUwmkaiF9rsrvxC8g",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40301 - Disclosure - Significant accounting policies - Useful lives of property, plant and equipment (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfPropertyPlantAndEquipmentDetails",
     "shortName": "Significant accounting policies - Useful lives of property, plant and equipment (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfDepreciationAndAmortisationExpenseExplanatory",
       "ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_ifrs-full_ComputerEquipmentMember_ikUjHgUwmkaiF9rsrvxC8g",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R52": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory",
       "ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_gbnh_IfrsNoncompeteAgreementsMember_LVe5Y0jK7UyI5UX7O0vqBw",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40302 - Disclosure - Significant accounting policies - Useful lives of intangible assets (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfIntangibleAssetsDetails",
     "shortName": "Significant accounting policies - Useful lives of intangible assets (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory",
       "ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_gbnh_IfrsNoncompeteAgreementsMember_LVe5Y0jK7UyI5UX7O0vqBw",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R53": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory",
       "ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "gbnh:NumberOfReportableSegment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_segment_ESxWe7p8DE2LEPwPXJ2prg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40303 - Disclosure - Significant accounting policies - Additional information (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesAdditionalInformationDetails",
     "shortName": "Significant accounting policies - Additional information (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory",
       "ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "gbnh:NumberOfReportableSegment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_segment_ESxWe7p8DE2LEPwPXJ2prg",
      "xsiNil": "false"
     }
    },
    "R54": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "gbnh:DisclosureOfDeferredAndContingentConsiderationExplanatoryTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "gbnh:Deferredconsiderationfundsheldinescrowaccount",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40501 - Disclosure - Business acquisitions (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
     "shortName": "Business acquisitions (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_9_26_2019_ifrs-full_BusinessCombinationsAxis_gbnh_AchieveTmsWestAcquisitionMember__HSbP2jFdUyYWhDHdislwQ",
      "decimals": "2",
      "lang": null,
      "name": "gbnh:PurchasePriceOfCommonShares",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Divide_USD_shares_xVkU6-_F00m4UKtSKiOK7w",
      "xsiNil": "false"
     }
    },
    "R55": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "gbnh:DisclosureOfDeferredAndContingentConsiderationExplanatoryTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_3_26_2021_zpj4B4jFgkKDXtSyipHuww",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "gbnh:EarnOutConsiderationPayable",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40502 - Disclosure - Business acquisitions - Allocation of purchase price (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
     "shortName": "Business acquisitions - Allocation of purchase price (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis_gbnh_AchieveTmsCashGeneratingUnitMember_aHLQV-rkEkGbNZnXkyIjfQ",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R56": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:PropertyPlantAndEquipment",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40601 - Disclosure - Property, plant and equipment (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails",
     "shortName": "Property, plant and equipment (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory",
       "ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2019_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_ifrs-full_GrossCarryingAmountMember_LkxUEetyZUeuznnchxzM9w",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:PropertyPlantAndEquipment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R57": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:PropertyPlantAndEquipment",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40602 - Disclosure - Property, plant and equipment - Accumulated depreciation (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
     "shortName": "Property, plant and equipment - Accumulated depreciation (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory",
       "ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2019_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember_WPsBSx5V-ESVdDIq0Zutdw",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:PropertyPlantAndEquipment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R58": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:IntangibleAssetsOtherThanGoodwill",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40701 - Disclosure - Intangible assets (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails",
     "shortName": "Intangible assets (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory",
       "ifrs-full:DisclosureOfIntangibleAssetsAndGoodwillExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2019_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_ifrs-full_GrossCarryingAmountMember_LkxUEetyZUeuznnchxzM9w",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:IntangibleAssetsOtherThanGoodwill",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R59": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:Goodwill",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40702 - Disclosure - Intangible assets - Accumulated amortization (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails",
     "shortName": "Intangible assets - Accumulated amortization (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_BusinessCombinationsAxis_gbnh_AchieveAcquisitionMember_lHynWZctWkaOGmjBSHA2XQ",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:Goodwill",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R6": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfNatureOfBusinessExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "10101 - Disclosure - Reporting entity",
     "role": "http://www.greenbrooktms.com/role/DisclosureReportingEntity",
     "shortName": "Reporting entity",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:DisclosureOfNatureOfBusinessExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R60": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:Goodwill",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40703 - Disclosure - Intangible assets - Additional Information (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails",
     "shortName": "Intangible assets - Additional Information (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis_gbnh_AchieveTmsCashGeneratingUnitMember_aHLQV-rkEkGbNZnXkyIjfQ",
      "decimals": "2",
      "lang": null,
      "name": "ifrs-full:DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_pure_65-EXjmW-UGA5QuHSh92Mw",
      "xsiNil": "false"
     }
    },
    "R61": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:RightofuseAssets",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40801 - Disclosure - Right-of-use assets and leases liabilities - Right of use assets (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails",
     "shortName": "Right-of-use assets and leases liabilities - Right of use assets (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory",
       "ifrs-full:DisclosureOfLeasesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:AdditionsToRightofuseAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R62": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "ifrs-full:BorrowingsInterestRate",
      "reportCount": 1,
      "unitRef": "Unit_Standard_pure_65-EXjmW-UGA5QuHSh92Mw",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40802 - Disclosure - Right-of-use assets and leases liabilities - Lease liabilities (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesLeaseLiabilitiesDetails",
     "shortName": "Right-of-use assets and leases liabilities - Lease liabilities (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "lang": null,
      "name": "gbnh:AdditionsToLeaseLiabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R63": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:GrossLeaseLiabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40803 - Disclosure - Right-of-use assets and leases liabilities - Undiscounted cash flows for lease liabilities (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails",
     "shortName": "Right-of-use assets and leases liabilities - Undiscounted cash flows for lease liabilities (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:GrossLeaseLiabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R64": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "gbnh:ScheduleOfTradeAndOtherPayablesTableTextBlock",
       "ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "40901 - Disclosure - Accounts payable and accrued liabilities (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesDetails",
     "shortName": "Accounts payable and accrued liabilities (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "gbnh:ScheduleOfTradeAndOtherPayablesTableTextBlock",
       "ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R65": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsExplanatory",
       "ifrs-full:DisclosureOfBorrowingsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_BorrowingsByNameAxis_gbnh_BankLoansMember_EJbvzfzTt0eLG3Ql4TD_Bw",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:Borrowings",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41001 - Disclosure - Loans payable - Bank Loans (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails",
     "shortName": "Loans payable - Bank Loans (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsExplanatory",
       "ifrs-full:DisclosureOfBorrowingsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_BorrowingsByNameAxis_gbnh_BankLoansMember_EJbvzfzTt0eLG3Ql4TD_Bw",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:CurrentPortionOfLongtermBorrowings",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R66": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "gbnh:DisclosureOfMaturityAnalysisOfUndiscountedContractualCashFlowsTableTextBlock",
       "ifrs-full:DisclosureOfBorrowingsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:BankBorrowingsUndiscountedCashFlows",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41002 - Disclosure - Loans payable - Undiscounted cash flows for bank loans (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
     "shortName": "Loans payable - Undiscounted cash flows for bank loans (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "gbnh:DisclosureOfMaturityAnalysisOfUndiscountedContractualCashFlowsTableTextBlock",
       "ifrs-full:DisclosureOfBorrowingsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:BankBorrowingsUndiscountedCashFlows",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R67": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "ifrs-full:BorrowingsInterestRate",
      "reportCount": 1,
      "unitRef": "Unit_Standard_pure_65-EXjmW-UGA5QuHSh92Mw",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41003 - Disclosure - Loans payable - Device loans, PPP loans and New Credit Facility (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
     "shortName": "Loans payable - Device loans, PPP loans and New Credit Facility (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_ifrs-full_TypesOfInterestRatesAxis_ifrs-full_FixedInterestRateMember_zUouE4HGGUiSl2QiyvvDYg",
      "decimals": "2",
      "lang": null,
      "name": "gbnh:BorrowingsEffectiveInterestRate",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_pure_65-EXjmW-UGA5QuHSh92Mw",
      "xsiNil": "false"
     }
    },
    "R68": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:ShorttermBorrowings",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41004 - Disclosure - Loans payable - Non-controlling interest loans (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureLoansPayableNonControllingInterestLoansDetails",
     "shortName": "Loans payable - Non-controlling interest loans (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_BorrowingsByNameAxis_gbnh_NoncontrollingInterestLoansMember_TWSYui6ERU6zcS5PQeU5NQ",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:ShorttermBorrowings",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R69": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "gbnh:DisclosureOfDetailedInformationAboutDeferredGrantIncomeExplanatory",
       "ifrs-full:DisclosureOfGovernmentGrantsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:GovernmentGrants",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41101 - Disclosure - Deferred grant income (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureDeferredGrantIncomeDetails",
     "shortName": "Deferred grant income (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "gbnh:DisclosureOfDetailedInformationAboutDeferredGrantIncomeExplanatory",
       "ifrs-full:DisclosureOfGovernmentGrantsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:GovernmentGrants",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R7": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "10201 - Disclosure - Basis of preparation",
     "role": "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparation",
     "shortName": "Basis of preparation",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R70": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "gbnh:IfrsWarrantsAndRightsOutstanding",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41201 - Disclosure - Other payables - Lender warrants (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails",
     "shortName": "Other payables - Lender warrants (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_ifrs-full_BorrowingsByNameAxis_gbnh_SecuredCreditFacilityMember_KZ0uMFIurkentIOqtunI4A",
      "decimals": "2",
      "lang": null,
      "name": "gbnh:PercentageOfAdditionalLenderWarrantsRequiredToBeIssues",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_pure_65-EXjmW-UGA5QuHSh92Mw",
      "xsiNil": "false"
     }
    },
    "R71": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:ExplanationOfEffectOfSharebasedPaymentsOnFinancialPositions",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_gbnh_DeferredShareUnitsMember__Zv2swkub0CiOyB1EYoaRw",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:LiabilitiesFromSharebasedPaymentTransactions2011",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41202 - Disclosure - Other payables - DSU's & PSU's (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails",
     "shortName": "Other payables - DSU's & PSU's (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:ExplanationOfEffectOfSharebasedPaymentsOnFinancialPositions",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_gbnh_DeferredShareUnitsMember__Zv2swkub0CiOyB1EYoaRw",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:LiabilitiesFromSharebasedPaymentTransactions2011",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R72": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:ContingentConsiderationRecognisedAsOfAcquisitionDate",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41301 - Disclosure - Deferred and contingent consideration (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationDetails",
     "shortName": "Deferred and contingent consideration (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R73": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:ContingentConsiderationRecognisedAsOfAcquisitionDate",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41302 - Disclosure - Deferred and contingent consideration - Additional Information (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails",
     "shortName": "Deferred and contingent consideration - Additional Information (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "gbnh:DisclosureOfDeferredAndContingentConsiderationExplanatoryTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_3_26_2021_To_3_26_2021_kUo09nf8NkuYaSYkJAACsg",
      "decimals": "0",
      "lang": null,
      "name": "gbnh:EarnOutConsiderationPaidInCash",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R74": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_ClassesOfShareCapitalAxis_ifrs-full_PreferenceSharesMember_-_gofHzKJE68duK2gFC55Q",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "ifrs-full:NumberOfSharesIssued",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_shares_Z2ipPRZaXkyV90L33GwBiA",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41401 - Disclosure - Common shares - Narrative (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureCommonSharesNarrativeDetails",
     "shortName": "Common shares - Narrative (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_ClassesOfShareCapitalAxis_ifrs-full_PreferenceSharesMember_-_gofHzKJE68duK2gFC55Q",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "ifrs-full:NumberOfSharesIssued",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_shares_Z2ipPRZaXkyV90L33GwBiA",
      "xsiNil": "false"
     }
    },
    "R75": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:Equity",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41402 - Disclosure - Common shares - Reconciliation of Shares Outstanding (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
     "shortName": "Common shares - Reconciliation of Shares Outstanding (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "gbnh:DisclosureOfDetailedInformationAboutShareCapitalTableTextBlock",
       "ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2018_ifrs-full_ClassesOfShareCapitalAxis_ifrs-full_OrdinarySharesMember_p7uaaiyNkU2CmdHf3NRhmg",
      "decimals": "INF",
      "lang": null,
      "name": "ifrs-full:NumberOfSharesOutstanding",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_shares_Z2ipPRZaXkyV90L33GwBiA",
      "xsiNil": "false"
     }
    },
    "R76": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:ProceedsFromIssuingShares",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41403 - Disclosure - Common shares - Share Issuance Offerings (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
     "shortName": "Common shares - Share Issuance Offerings (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_9_27_2021_gbnh_TypeOfIssuanceOfStockAxis_gbnh_PublicOfferingMember_ifrs-full_ClassesOfShareCapitalAxis_ifrs-full_OrdinarySharesMember_JdMUTYBDw0m3MvOmVEBLAg",
      "decimals": "2",
      "lang": null,
      "name": "gbnh:IfrsSharesIssuedPricePerShare",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Divide_USD_shares_xVkU6-_F00m4UKtSKiOK7w",
      "xsiNil": "false"
     }
    },
    "R77": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "gbnh:DisclosureOfDeferredAndContingentConsiderationExplanatoryTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_3_26_2021_zpj4B4jFgkKDXtSyipHuww",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "gbnh:EarnOutConsiderationPayable",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41404 - Disclosure - Common shares - Share Issuance Acquisition (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
     "shortName": "Common shares - Share Issuance Acquisition (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_9_26_2019_ifrs-full_BusinessCombinationsAxis_gbnh_AchieveAcquisitionMember_ifrs-full_ClassesOfShareCapitalAxis_ifrs-full_OrdinarySharesMember_5mcgjPVJmUKIDZZv0Dw_Cg",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:EquityInterestsOfAcquirer",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R78": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "gbnh:DisclosureOfShareBasedPaymentAndWarrantsArrangementsTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41501 - Disclosure - Contributed surplus - Options narrative (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails",
     "shortName": "Contributed surplus - Options narrative (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "gbnh:DisclosureOfShareBasedPaymentAndWarrantsArrangementsTextBlock",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "gbnh:IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R79": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:NumberOfOutstandingShareOptions",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41502 - Disclosure - Contributed surplus - Reconciliation of share options (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails",
     "shortName": "Contributed surplus - Reconciliation of share options (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2018_jzxLMpyVm0SD93MZXYTJuA",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:NumberOfOutstandingShareOptions",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R8": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "10301 - Disclosure - Significant accounting policies",
     "role": "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPolicies",
     "shortName": "Significant accounting policies",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R80": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_11_9_2021_To_11_9_2021_3ShxORi9bke5KzKqOE658w",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "ifrs-full:WeightedAverageSharePriceShareOptionsGranted2019",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Divide_USD_shares_xVkU6-_F00m4UKtSKiOK7w",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41503 - Disclosure - Contributed surplus - Fair value of share option awards (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfShareOptionAwardsDetails",
     "shortName": "Contributed surplus - Fair value of share option awards (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_11_9_2021_To_11_9_2021_3ShxORi9bke5KzKqOE658w",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "ifrs-full:WeightedAverageSharePriceShareOptionsGranted2019",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Divide_USD_shares_xVkU6-_F00m4UKtSKiOK7w",
      "xsiNil": "false"
     }
    },
    "R81": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "gbnh:DisclosureOfNumberAndWeightedAverageExercisePricesOfWarrantsTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2020_dloGYVdeS0m7IjUpkNi4kA",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "gbnh:NumberOfOutstandingWarrants",
      "reportCount": 1,
      "unitRef": "Unit_Standard_shares_Z2ipPRZaXkyV90L33GwBiA",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41504 - Disclosure - Contributed surplus- Broker warrants (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureContributedSurplusBrokerWarrantsDetails",
     "shortName": "Contributed surplus- Broker warrants (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "gbnh:DisclosureOfNumberAndWeightedAverageExercisePricesOfWarrantsTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2018_jzxLMpyVm0SD93MZXYTJuA",
      "decimals": "INF",
      "lang": null,
      "name": "gbnh:NumberOfOutstandingWarrants",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_shares_Z2ipPRZaXkyV90L33GwBiA",
      "xsiNil": "false"
     }
    },
    "R82": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "gbnh:NumberOfWarrantsIssued",
      "reportCount": 1,
      "unitRef": "Unit_Standard_shares_Z2ipPRZaXkyV90L33GwBiA",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41505 - Disclosure - Contributed surplus - Fair value of broker warrants (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails",
     "shortName": "Contributed surplus - Fair value of broker warrants (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_5_17_2019_37UNy212X0yjaKklpin9kw",
      "decimals": "2",
      "lang": null,
      "name": "gbnh:WarrantExercisePrice",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Divide_CAD_shares_IJ51R3IkaUGKMV0SMqsumQ",
      "xsiNil": "false"
     }
    },
    "R83": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ifrs-full:DisclosureOfEmployeeBenefitsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "3",
      "first": true,
      "lang": null,
      "name": "gbnh:IfrsDefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPay",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_pure_65-EXjmW-UGA5QuHSh92Mw",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41701 - Disclosure - Pensions (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosurePensionsDetails",
     "shortName": "Pensions (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ifrs-full:DisclosureOfEmployeeBenefitsExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "3",
      "first": true,
      "lang": null,
      "name": "gbnh:IfrsDefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPay",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_pure_65-EXjmW-UGA5QuHSh92Mw",
      "xsiNil": "false"
     }
    },
    "R84": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ifrs-full:DisclosureOfIncomeTaxExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41801 - Disclosure - Income taxes - Reconciliation of tax expense (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails",
     "shortName": "Income taxes - Reconciliation of tax expense (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ifrs-full:DisclosureOfIncomeTaxExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R85": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_gbnh_TemporaryDifferencePropertyPlantAndEquipmentMember_1Bx1IWPveUuAvbAtwRf8Zw",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:DeferredTaxLiabilityAsset",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41802 - Disclosure - Income taxes - Unused tax assets and liabilities (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesUnusedTaxAssetsAndLiabilitiesDetails",
     "shortName": "Income taxes - Unused tax assets and liabilities (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_gbnh_TemporaryDifferencePropertyPlantAndEquipmentMember_1Bx1IWPveUuAvbAtwRf8Zw",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:DeferredTaxLiabilityAsset",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R86": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41803 - Disclosure - Income taxes - Deferred tax assets and liabilities , property plant and equipment (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesPropertyPlantAndEquipmentDetails",
     "shortName": "Income taxes - Deferred tax assets and liabilities , property plant and equipment (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R87": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "ifrs-full:BorrowingsInterestRate",
      "reportCount": 1,
      "unitRef": "Unit_Standard_pure_65-EXjmW-UGA5QuHSh92Mw",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41901 - Disclosure - Risk management arising from financial instruments (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails",
     "shortName": "Risk management arising from financial instruments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_BorrowingsByNameAxis_gbnh_SecuredCreditFacilityMember_Lr4pqIgYhkyjy48ya-SsPQ",
      "decimals": "2",
      "lang": null,
      "name": "ifrs-full:PercentageOfReasonablyPossibleIncreaseInActuarialAssumption",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_pure_65-EXjmW-UGA5QuHSh92Mw",
      "xsiNil": "false"
     }
    },
    "R88": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_ClassesOfFinancialAssetsAxis_ifrs-full_TradeReceivablesMember_nG0SIQkj9EqEwgVItLV7dQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:FinancialAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "41902 - Disclosure - Risk management arising from financial instruments - Schedule of aging (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails",
     "shortName": "Risk management arising from financial instruments - Schedule of aging (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_ClassesOfFinancialAssetsAxis_ifrs-full_TradeReceivablesMember_nG0SIQkj9EqEwgVItLV7dQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:FinancialAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R89": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory",
       "ifrs-full:DisclosureOfRelatedPartyExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "42101 - Disclosure - Related party transactions (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsDetails",
     "shortName": "Related party transactions (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory",
       "ifrs-full:DisclosureOfRelatedPartyExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R9": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfChangesInAccountingPoliciesAccountingEstimatesAndErrorsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "10401 - Disclosure - Recent accounting pronouncements",
     "role": "http://www.greenbrooktms.com/role/DisclosureRecentAccountingPronouncements",
     "shortName": "Recent accounting pronouncements",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ifrs-full:DisclosureOfChangesInAccountingPoliciesAccountingEstimatesAndErrorsExplanatory",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R90": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:SellingGeneralAndAdministrativeExpense",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "42102 - Disclosure - Related party transactions - Additional information (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails",
     "shortName": "Related party transactions - Additional information (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ifrs-full:DisclosureOfRelatedPartyExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_ifrs-full_CategoriesOfRelatedPartiesAxis_gbnh_GreybrookHealthInc.Member__1sfCLi4ZUuhiLqJ6YklHw",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:SellingGeneralAndAdministrativeExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R91": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:EarningsPerShareExplanatory",
       "ifrs-full:DisclosureOfEarningsPerShareExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "42201 - Disclosure - Basic and diluted loss per share (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShareDetails",
     "shortName": "Basic and diluted loss per share (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:EarningsPerShareExplanatory",
       "ifrs-full:DisclosureOfEarningsPerShareExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R92": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory",
       "ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_gbnh_GreenbrookTmsCentralFloridaLlcMember_R8mdEGpQ002tx1s5brU51Q",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "ifrs-full:ProportionOfOwnershipInterestInSubsidiary",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_pure_65-EXjmW-UGA5QuHSh92Mw",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "42301 - Disclosure - Non-controlling interest - Ownership Interest (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails",
     "shortName": "Non-controlling interest - Ownership Interest (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory",
       "ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_gbnh_GreenbrookTmsCentralFloridaLlcMember_R8mdEGpQ002tx1s5brU51Q",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "ifrs-full:ProportionOfOwnershipInterestInSubsidiary",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_pure_65-EXjmW-UGA5QuHSh92Mw",
      "xsiNil": "false"
     }
    },
    "R93": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_bXOX4w6otE6yTXWDptZzWQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:Cash",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "42302 - Disclosure - Non-controlling interest - Consolidated Amounts (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
     "shortName": "Non-controlling interest - Consolidated Amounts (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "gbnh:ScheduleOfConsolidatedAmountsForSubsidiariesTableTextBlock",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "As_Of_12_31_2021_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_ifrs-full_SubsidiariesMember_2_K_FbXFek2kQVa-4N40tg",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:Cash",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    },
    "R94": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ifrs-full:DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory",
       "ix:continuation",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_xltFiAm3d0W2NrDQw5epSQ",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "ifrs-full:ImpairmentLossRecognisedInProfitOrLossTradeReceivables",
      "reportCount": 1,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "42401 - Disclosure - Expenses by nature (Details)",
     "role": "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails",
     "shortName": "Expenses by nature (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "gbnh:DisclosureOfOtherRegionalAndCenterSupportCostsTableTextBlock",
       "ifrs-full:DisclosureOfExpensesByNatureExplanatory",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "gbnh-20211231x20f.htm",
      "contextRef": "Duration_1_1_2021_To_12_31_2021_gbnh_ExpenseByFunctionAxis_gbnh_OtherRegionalAndSupportCenterCostsMember_N7_q5sHD8ECPT2ADa_-vDg",
      "decimals": "0",
      "lang": null,
      "name": "ifrs-full:ShorttermEmployeeBenefitsExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Unit_Standard_USD_-8_lADY8s0ypwMx1X6oQLg",
      "xsiNil": "false"
     }
    }
   },
   "segmentCount": 77,
   "tag": {
    "dei_AddressTypeDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "An entity may have several addresses for different purposes and this domain represents all such types.",
        "label": "Address Type [Domain]"
       }
      }
     },
     "localname": "AddressTypeDomain",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "domainItemType"
    },
    "dei_AmendmentFlag": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.",
        "label": "Amendment Flag"
       }
      }
     },
     "localname": "AmendmentFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_AuditorFirmId": {
     "auth_ref": [
      "r245",
      "r246",
      "r247"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "PCAOB issued Audit Firm Identifier",
        "label": "Auditor Firm ID"
       }
      }
     },
     "localname": "AuditorFirmId",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "nonemptySequenceNumberItemType"
    },
    "dei_AuditorLocation": {
     "auth_ref": [
      "r245",
      "r246",
      "r247"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Auditor Location"
       }
      }
     },
     "localname": "AuditorLocation",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "internationalNameItemType"
    },
    "dei_AuditorName": {
     "auth_ref": [
      "r245",
      "r246",
      "r247"
     ],
     "lang": {
      "en-us": {
       "role": {
        "label": "Auditor Name"
       }
      }
     },
     "localname": "AuditorName",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "internationalNameItemType"
    },
    "dei_BusinessContactMember": {
     "auth_ref": [
      "r246",
      "r247"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Business contact for the entity",
        "label": "Business Contact"
       }
      }
     },
     "localname": "BusinessContactMember",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "domainItemType"
    },
    "dei_CityAreaCode": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Area code of city",
        "label": "City Area Code"
       }
      }
     },
     "localname": "CityAreaCode",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_ContactPersonnelName": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Name of contact personnel",
        "label": "Contact Personnel Name"
       }
      }
     },
     "localname": "ContactPersonnelName",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_CoverAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Cover page.",
        "label": "Document and Entity Information [Abstract]"
       }
      }
     },
     "localname": "CoverAbstract",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "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"
       }
      }
     },
     "localname": "CurrentFiscalYearEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "gMonthDayItemType"
    },
    "dei_DocumentAccountingStandard": {
     "auth_ref": [
      "r246"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The basis of accounting the registrant has used to prepare the financial statements included in this filing This can either be 'U.S. GAAP', 'International Financial Reporting Standards', or 'Other'.",
        "label": "Document Accounting Standard"
       }
      }
     },
     "localname": "DocumentAccountingStandard",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "accountingStandardItemType"
    },
    "dei_DocumentAnnualReport": {
     "auth_ref": [
      "r245",
      "r246",
      "r247"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as an annual report.",
        "label": "Document Annual Report"
       }
      }
     },
     "localname": "DocumentAnnualReport",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentFiscalPeriodFocus": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fiscal period values are FY, Q1, Q2, and Q3.  1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.",
        "label": "Document Fiscal Period Focus"
       }
      }
     },
     "localname": "DocumentFiscalPeriodFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "fiscalPeriodItemType"
    },
    "dei_DocumentFiscalYearFocus": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This is focus fiscal year of the document report in YYYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.",
        "label": "Document Fiscal Year Focus"
       }
      }
     },
     "localname": "DocumentFiscalYearFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "gYearItemType"
    },
    "dei_DocumentPeriodEndDate": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period.  The format of the date is YYYY-MM-DD.",
        "label": "Document Period End Date"
       }
      }
     },
     "localname": "DocumentPeriodEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "dateItemType"
    },
    "dei_DocumentRegistrationStatement": {
     "auth_ref": [
      "r241"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as a registration statement.",
        "label": "Document Registration Statement"
       }
      }
     },
     "localname": "DocumentRegistrationStatement",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentShellCompanyReport": {
     "auth_ref": [
      "r246"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true for a Shell Company Report pursuant to section 13 or 15(d) of the Exchange Act.",
        "label": "Document Shell Company Report"
       }
      }
     },
     "localname": "DocumentShellCompanyReport",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentTransitionReport": {
     "auth_ref": [
      "r248"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as a transition report.",
        "label": "Document Transition Report"
       }
      }
     },
     "localname": "DocumentTransitionReport",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentType": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.",
        "label": "Document Type"
       }
      }
     },
     "localname": "DocumentType",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "submissionTypeItemType"
    },
    "dei_EntitiesTable": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Container to assemble all relevant information about each entity associated with the document instance",
        "label": "Entities [Table]"
       }
      }
     },
     "localname": "EntitiesTable",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_EntityAddressAddressLine1": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Address Line 1 such as Attn, Building Name, Street Name",
        "label": "Entity Address, Address Line One"
       }
      }
     },
     "localname": "EntityAddressAddressLine1",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressCityOrTown": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Name of the City or Town",
        "label": "Entity Address, City or Town"
       }
      }
     },
     "localname": "EntityAddressCityOrTown",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressCountry": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "ISO 3166-1 alpha-2 country code.",
        "label": "Entity Address, Country"
       }
      }
     },
     "localname": "EntityAddressCountry",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "countryCodeItemType"
    },
    "dei_EntityAddressPostalZipCode": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Code for the postal or zip code",
        "label": "Entity Address, Postal Zip Code"
       }
      }
     },
     "localname": "EntityAddressPostalZipCode",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressesAddressTypeAxis": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.",
        "label": "Entity Addresses, Address Type [Axis]"
       }
      }
     },
     "localname": "EntityAddressesAddressTypeAxis",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_EntityCentralIndexKey": {
     "auth_ref": [
      "r243"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.",
        "label": "Entity Central Index Key"
       }
      }
     },
     "localname": "EntityCentralIndexKey",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "centralIndexKeyItemType"
    },
    "dei_EntityCommonStockSharesOutstanding": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.",
        "label": "Entity Common Stock, Shares Outstanding"
       }
      }
     },
     "localname": "EntityCommonStockSharesOutstanding",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "sharesItemType"
    },
    "dei_EntityCurrentReportingStatus": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Current Reporting Status"
       }
      }
     },
     "localname": "EntityCurrentReportingStatus",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityEmergingGrowthCompany": {
     "auth_ref": [
      "r243"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate if registrant meets the emerging growth company criteria.",
        "label": "Entity Emerging Growth Company"
       }
      }
     },
     "localname": "EntityEmergingGrowthCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityExTransitionPeriod": {
     "auth_ref": [
      "r251"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate if an emerging growth company has elected not to use the extended transition period for complying with any new or revised financial accounting standards.",
        "label": "Entity Ex Transition Period"
       }
      }
     },
     "localname": "EntityExTransitionPeriod",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityFileNumber": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
        "label": "Entity File Number"
       }
      }
     },
     "localname": "EntityFileNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "fileNumberItemType"
    },
    "dei_EntityFilerCategory": {
     "auth_ref": [
      "r243"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Filer Category"
       }
      }
     },
     "localname": "EntityFilerCategory",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "filerCategoryItemType"
    },
    "dei_EntityIncorporationStateCountryCode": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Two-character EDGAR code representing the state or country of incorporation.",
        "label": "Entity Incorporation, State or Country Code"
       }
      }
     },
     "localname": "EntityIncorporationStateCountryCode",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "edgarStateCountryItemType"
    },
    "dei_EntityInformationLineItems": {
     "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": "Entity Information [Line Items]"
       }
      }
     },
     "localname": "EntityInformationLineItems",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_EntityInteractiveDataCurrent": {
     "auth_ref": [
      "r249"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).",
        "label": "Entity Interactive Data Current"
       }
      }
     },
     "localname": "EntityInteractiveDataCurrent",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityRegistrantName": {
     "auth_ref": [
      "r243"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
        "label": "Entity Registrant Name"
       }
      }
     },
     "localname": "EntityRegistrantName",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityShellCompany": {
     "auth_ref": [
      "r243"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.",
        "label": "Entity Shell Company"
       }
      }
     },
     "localname": "EntityShellCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityVoluntaryFilers": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.",
        "label": "Entity Voluntary Filers"
       }
      }
     },
     "localname": "EntityVoluntaryFilers",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityWellKnownSeasonedIssuer": {
     "auth_ref": [
      "r250"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A.",
        "label": "Entity Well-known Seasoned Issuer"
       }
      }
     },
     "localname": "EntityWellKnownSeasonedIssuer",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_LocalPhoneNumber": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Local phone number for entity.",
        "label": "Local Phone Number"
       }
      }
     },
     "localname": "LocalPhoneNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_Security12bTitle": {
     "auth_ref": [
      "r242"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Title of a 12(b) registered security.",
        "label": "Title of 12(b) Security"
       }
      }
     },
     "localname": "Security12bTitle",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "securityTitleItemType"
    },
    "dei_SecurityExchangeName": {
     "auth_ref": [
      "r244"
     ],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Name of the Exchange on which a security is registered.",
        "label": "Security Exchange Name"
       }
      }
     },
     "localname": "SecurityExchangeName",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "edgarExchangeCodeItemType"
    },
    "dei_TradingSymbol": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Trading symbol of an instrument as listed on an exchange.",
        "label": "Trading Symbol"
       }
      }
     },
     "localname": "TradingSymbol",
     "nsuri": "http://xbrl.sec.gov/dei/2021q4",
     "presentation": [
      "http://www.greenbrooktms.com/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "tradingSymbolItemType"
    },
    "gbnh_AccountsPayableAndAccruedLiabilitiesRecognisedAsOfAcquisitionDate": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 7.0,
       "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount recognised as of the acquisition date for accounts payable and accrued liabilities assumed in a business combination.",
        "label": "Accounts Payable and Accrued Liabilities Recognised as of Acquisition Date",
        "terseLabel": "Accounts payable and accrued liabilities"
       }
      }
     },
     "localname": "AccountsPayableAndAccruedLiabilitiesRecognisedAsOfAcquisitionDate",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_AchieveAcquisitionMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents the acquisition of Achieve TMS Centers LLC and Achieve TMS Alaska LLC.",
        "label": "Achieve"
       }
      }
     },
     "localname": "AchieveAcquisitionMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_AchieveTmsCashGeneratingUnitMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents the Achieve TMS cash generating unit.",
        "label": "Achieve TMS CGU"
       }
      }
     },
     "localname": "AchieveTmsCashGeneratingUnitMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_AchieveTmsEastAcquisitionMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information related to TMS east",
        "label": "Achieve TMS East Acquisition [Member]"
       }
      }
     },
     "localname": "AchieveTmsEastAcquisitionMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsTables"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_AchieveTmsEastCentralCguMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for Achieve TMS East/Central CGU.",
        "label": "Achieve TMS East/Central CGU"
       }
      }
     },
     "localname": "AchieveTmsEastCentralCguMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_AchieveTmsWestAcquisitionMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information related to TMS west",
        "label": "Achieve TMS West Acquisition [Member]"
       }
      }
     },
     "localname": "AchieveTmsWestAcquisitionMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsTables"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_AchieveTmsWestCguMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for Achieve TMS West CGU.",
        "label": "Achieve TMS West CGU"
       }
      }
     },
     "localname": "AchieveTmsWestCguMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_AdditionThroughBusinessCombinationsOfLeaseLiabilities": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This element represents for addition through business combination of lease liabilities.",
        "label": "Addition Through Business Combinations Of Lease Liabilities",
        "terseLabel": "Additions through business combinations"
       }
      }
     },
     "localname": "AdditionThroughBusinessCombinationsOfLeaseLiabilities",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipmentThroughBusinessCombination": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of additions to property, plant and equipment other than those acquired through business combinations.",
        "label": "Additions Other Than Through Business Combinations Property Plant And Equipment Through Business Combination",
        "terseLabel": "Additions through business combination"
       }
      }
     },
     "localname": "AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipmentThroughBusinessCombination",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_AdditionsToLeaseLiabilities": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Additions to lease liabilities.",
        "label": "Additions To Lease Liabilities",
        "terseLabel": "Additions to lease liability"
       }
      }
     },
     "localname": "AdditionsToLeaseLiabilities",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_AdjustmentForEarnOutConsiderationExpense": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 10.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Adjustments for earn-out consideration expense to reconcile profit (loss) to net cash flow from (used in) operating activities",
        "label": "Adjustment For Earn-Out Consideration Expense",
        "verboseLabel": "Earn-out consideration"
       }
      }
     },
     "localname": "AdjustmentForEarnOutConsiderationExpense",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_AdjustmentForShareIssueRelatedCostCash": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 7.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Adjustments for share issue payments in cash  to reconcile profit (loss) to net cash flow from (used in) operating activities",
        "label": "Adjustment for share issue related cost cash",
        "terseLabel": "Transaction costs"
       }
      }
     },
     "localname": "AdjustmentForShareIssueRelatedCostCash",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_AdjustmentForShareIssueRelatedCostNoncash": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 8.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Adjustments for noncash share issue expense to reconcile profit (loss) to net cash flow from (used in) operating activities",
        "label": "Adjustment for share issue related cost noncash",
        "terseLabel": "Non-cash transactions"
       }
      }
     },
     "localname": "AdjustmentForShareIssueRelatedCostNoncash",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_AdjustmentsForDecreaseIncreaseInPrepaymentsAndOtherCurrentAssets": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 12.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Adjustments for decrease (increase) in prepayments and other current assets to reconcile profit (loss) to net cash flow from (used in) operating activities.",
        "label": "Adjustments for decrease (increase) in prepayments and other current assets",
        "terseLabel": "Prepaid expenses and other"
       }
      }
     },
     "localname": "AdjustmentsForDecreaseIncreaseInPrepaymentsAndOtherCurrentAssets",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_AdjustmentsForForgivenessOfLoanPayable": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 9.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "\"Adjustments for Forgiveness of loan payable to reconcile profit (loss) to net cash flow from (used in) operating activities.\"",
        "label": "Adjustments For Forgiveness Of Loan Payable",
        "terseLabel": "Forgiveness of loan payable (note 10(a))"
       }
      }
     },
     "localname": "AdjustmentsForForgivenessOfLoanPayable",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_AdjustmentsForWorkingCapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "No definition available.",
        "label": "Adjustments for working capital abstract",
        "terseLabel": "Change in non-cash operating working capital:"
       }
      }
     },
     "localname": "AdjustmentsForWorkingCapitalAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_AmortizationPeriod": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents the amortization period.",
        "label": "Amortization Period",
        "verboseLabel": "Amortization period"
       }
      }
     },
     "localname": "AmortizationPeriod",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_BankLoansMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loans from banks.",
        "label": "Bank loans"
       }
      }
     },
     "localname": "BankLoansMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableTables",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_BasisOfPreparationAndGoingConcern": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 3.0,
       "parentTag": "ifrs-full_EquityAndLiabilities",
       "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 a discussion of the basis of preparation and going concern reflected in the footnotes to the financial statements.",
        "label": "Basis Of Preparation and Going Concern",
        "terseLabel": "Basis of preparation and going concern (note 2)"
       }
      }
     },
     "localname": "BasisOfPreparationAndGoingConcern",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_BorrowingsDeferralPeriod": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Deferral period for the payments under the borrowings.",
        "label": "Borrowings, Deferral Period",
        "terseLabel": "Deferral period for loans"
       }
      }
     },
     "localname": "BorrowingsDeferralPeriod",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_BorrowingsEffectiveInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Borrowings, Effective Interest Rate",
        "label": "Borrowings, Effective Interest Rate",
        "terseLabel": "Effective interest rate"
       }
      }
     },
     "localname": "BorrowingsEffectiveInterestRate",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_BorrowingsFromRelatedPartiesCurrent": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 6.0,
       "parentTag": "ifrs-full_CurrentLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Current portion of borrowings from related parties.",
        "label": "Borrowings From Related Parties Current",
        "terseLabel": "Non-controlling interest loans (note 10(b))"
       }
      }
     },
     "localname": "BorrowingsFromRelatedPartiesCurrent",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_BorrowingsMonthlyPrincipalAndInterestPayment": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The monthly payment for principal and interest on a borrowing arrangement.",
        "label": "Borrowings Monthly Principal and Interest Payment",
        "terseLabel": "Monthly blended interest and capital payment"
       }
      }
     },
     "localname": "BorrowingsMonthlyPrincipalAndInterestPayment",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_BrokerWarrantsAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Broker Warrants 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": "Broker Warrants, Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount",
        "terseLabel": "Broker warrants excluded from the diluted calculation"
       }
      }
     },
     "localname": "BrokerWarrantsAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShareDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_BusinessAcquisitionSharePrices": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Price per share used to compute number of shares paid in a business combination.",
        "label": "Business Acquisition Share Prices",
        "terseLabel": "Share price for shares issued for acquisition"
       }
      }
     },
     "localname": "BusinessAcquisitionSharePrices",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "gbnh_CalculationOfFairValueAndAssumptionsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Calculation of fair value and assumptions abstract",
        "label": "Calculation of fair value and assumptions"
       }
      }
     },
     "localname": "CalculationOfFairValueAndAssumptionsAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfShareOptionAwardsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_CapitalManagementAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "n/a",
        "label": "Capital management"
       }
      }
     },
     "localname": "CapitalManagementAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "xbrltype": "stringItemType"
    },
    "gbnh_CashEarnOutConsiderationDeferred": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of cash Earn-Out consideration deferred.",
        "label": "Cash Earn-Out Consideration Deferred",
        "verboseLabel": "Deferred earn-out consideration payable in cash"
       }
      }
     },
     "localname": "CashEarnOutConsiderationDeferred",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_CashFlowAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "No definition available.",
        "label": "Cash Flow Abstract",
        "terseLabel": "Cash provided by (used in)"
       }
      }
     },
     "localname": "CashFlowAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_CashReceiptsFromRepaymentsOfInterestLoansFromRelatedParties": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 9.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cash inflow (outflow) for repayments of interest loans from related parties.",
        "label": "Cash Receipts From Repayments Of Interest Loans From Related Parties",
        "verboseLabel": "Net non-controlling interest loans advanced (repaid)"
       }
      }
     },
     "localname": "CashReceiptsFromRepaymentsOfInterestLoansFromRelatedParties",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_CenterLocationsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for center locations.",
        "label": "Center locations"
       }
      }
     },
     "localname": "CenterLocationsMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_ClassBUnitsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for Class B units.",
        "label": "Class B units"
       }
      }
     },
     "localname": "ClassBUnitsMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_ClassUnitsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for Class A units.",
        "label": "Class A units"
       }
      }
     },
     "localname": "ClassUnitsMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_ComputerSuppliesAndSoftwareExpense": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Computer supplies and software expense.",
        "label": "Computer Supplies And Software Expense",
        "terseLabel": "Computer supplies and software"
       }
      }
     },
     "localname": "ComputerSuppliesAndSoftwareExpense",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_CorporateGeneralAndAdministrativeExpenseMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Corporate, general and administrative",
        "label": "Corporate, general and administrative expense"
       }
      }
     },
     "localname": "CorporateGeneralAndAdministrativeExpenseMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_CostOfSalesExcludingDepreciation": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 2.0,
       "parentTag": "ifrs-full_CostOfSales",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Cost of sales excluding depreciation expense.",
        "label": "Cost Of Sales Excluding Depreciation",
        "terseLabel": "Direct center and patient care costs"
       }
      }
     },
     "localname": "CostOfSalesExcludingDepreciation",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_CurrentAssetsRecognisedAsOfAcquisitionDateExcludingCash": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 2.0,
       "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount recognised as of the acquisition date for current assets (excluding cash) acquired in a business combination.",
        "label": "Current assets recognised as of acquisition date excluding cash",
        "terseLabel": "Current assets, excluding cash acquired"
       }
      }
     },
     "localname": "CurrentAssetsRecognisedAsOfAcquisitionDateExcludingCash",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_DecreasedInNumberOfSharesIssuedAndOutstanding": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Decreased in number ofShares issued and outstanding.",
        "label": "Decreased In Number Of Shares Issued And Outstanding",
        "terseLabel": "Decreased in number ofShares issued and outstanding"
       }
      }
     },
     "localname": "DecreasedInNumberOfSharesIssuedAndOutstanding",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationAdditionalInformationDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_DeferredShareUnitsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for the deferred Share Units.",
        "label": "Deferred Share Units"
       }
      }
     },
     "localname": "DeferredShareUnitsMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesTables"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_Deferredconsiderationfundsheldinescrowaccount": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of deferred consideration funds held in escrow account.",
        "label": "DeferredConsiderationFundsHeldInEscrowAccount",
        "terseLabel": "Deferred consideration funds held in escrow account"
       }
      }
     },
     "localname": "Deferredconsiderationfundsheldinescrowaccount",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_DefinedContributionPlanAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "n/a",
        "label": "Pensions"
       }
      }
     },
     "localname": "DefinedContributionPlanAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "xbrltype": "stringItemType"
    },
    "gbnh_DescriptionOfAccountingPolicyForEquityPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The description of the entity's accounting policy for equity transactions.",
        "label": "Description of Accounting Policy For Equity Policy Text Block",
        "terseLabel": "Share capital"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForEquityPolicyTextBlock",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_DeviceLoansAssumedDuring2018Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loans assumed during 2018 that were previously extended for the purchase of TMS devices to noncontrolling interest partners.",
        "label": "2018 TMS Device Loans"
       }
      }
     },
     "localname": "DeviceLoansAssumedDuring2018Member",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_DeviceLoansAssumedDuring2019Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loans assumed during 2019 that were previously extended for the purchase of TMS devices to noncontrolling interest partners.",
        "label": "2019 TMS Device Loans"
       }
      }
     },
     "localname": "DeviceLoansAssumedDuring2019Member",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_DeviceLoansMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loans that were previously extended for the purchase of TMS devices to noncontrolling interest partners.",
        "label": "Device Loans"
       }
      }
     },
     "localname": "DeviceLoansMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_DisclosureOShareBasedCompensationAndWarrantsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "No definition available.",
        "label": "Contributed surplus."
       }
      }
     },
     "localname": "DisclosureOShareBasedCompensationAndWarrantsAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "xbrltype": "stringItemType"
    },
    "gbnh_DisclosureOfBasisOfPreparationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "NA",
        "label": "Basis of preparation"
       }
      }
     },
     "localname": "DisclosureOfBasisOfPreparationAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "xbrltype": "stringItemType"
    },
    "gbnh_DisclosureOfDeferredAndContingentConsiderationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Not available.",
        "label": "Deferred and contingent consideration"
       }
      }
     },
     "localname": "DisclosureOfDeferredAndContingentConsiderationAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "xbrltype": "stringItemType"
    },
    "gbnh_DisclosureOfDeferredAndContingentConsiderationExplanatoryTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The entire disclosure of deferred and contingent consideration.",
        "label": "Disclosure Of Deferred and contingent consideration Explanatory [Text Block]",
        "terseLabel": "Deferred and contingent consideration"
       }
      }
     },
     "localname": "DisclosureOfDeferredAndContingentConsiderationExplanatoryTextBlock",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsideration"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_DisclosureOfDeferredGrantIncomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "No definition available.",
        "label": "Deferred grant income"
       }
      }
     },
     "localname": "DisclosureOfDeferredGrantIncomeAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "xbrltype": "stringItemType"
    },
    "gbnh_DisclosureOfDetailedInformationAboutDeferredGrantIncomeExplanatory": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The disclosure of detailed information about deferred income from Government grants.",
        "label": "Disclosure Of Detailed Information About Deferred Grant Income, Explanatory",
        "verboseLabel": "Summary of components of deferred grant income"
       }
      }
     },
     "localname": "DisclosureOfDetailedInformationAboutDeferredGrantIncomeExplanatory",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredGrantIncomeTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_DisclosureOfDetailedInformationAboutShareCapitalTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of transactions in share capital.",
        "label": "Disclosure Of Detailed Information About Share Capital Table Text Block",
        "terseLabel": "Reconciliation of common shares outstanding"
       }
      }
     },
     "localname": "DisclosureOfDetailedInformationAboutShareCapitalTableTextBlock",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_DisclosureOfExpenseByNatureTable": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Schedule disclosing information related to Expenses By Nature.",
        "label": "Disclosure Of Expense By Nature [Table]"
       }
      }
     },
     "localname": "DisclosureOfExpenseByNatureTable",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_DisclosureOfExpensesByNatureLineItems": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.",
        "label": "Disclosure of expenses by nature [line items]",
        "verboseLabel": "Components of the Company's other regional, center support costs, corporate, general and administrative expenses"
       }
      }
     },
     "localname": "DisclosureOfExpensesByNatureLineItems",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_DisclosureOfMaturityAnalysisOfUndiscountedContractualCashFlowsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of maturity analysis of undiscounted cash outflows.",
        "label": "Disclosure Of Maturity Analysis Of Undiscounted Contractual Cash Flows [Table Text Block]",
        "terseLabel": "Schedule of undiscounted cash flows for bank loans"
       }
      }
     },
     "localname": "DisclosureOfMaturityAnalysisOfUndiscountedContractualCashFlowsTableTextBlock",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_DisclosureOfNatureOfBusinessAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "No definition available.",
        "label": "Reporting entity"
       }
      }
     },
     "localname": "DisclosureOfNatureOfBusinessAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "xbrltype": "stringItemType"
    },
    "gbnh_DisclosureOfNatureOfBusinessExplanatory": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Entire disclosure of Nature of business explanatory.",
        "label": "Disclosure Of Nature Of Business Explanatory",
        "terseLabel": "Reporting entity"
       }
      }
     },
     "localname": "DisclosureOfNatureOfBusinessExplanatory",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureReportingEntity"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_DisclosureOfNumberAndWeightedAverageExercisePricesOfWarrantsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of transactions in warrants.",
        "label": "Disclosure of number and weighted average exercise prices of warrants table text block",
        "terseLabel": "Reconciliation of broker warrants"
       }
      }
     },
     "localname": "DisclosureOfNumberAndWeightedAverageExercisePricesOfWarrantsTableTextBlock",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_DisclosureOfOtherPayablesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Not available.",
        "label": "Other payables"
       }
      }
     },
     "localname": "DisclosureOfOtherPayablesAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "xbrltype": "stringItemType"
    },
    "gbnh_DisclosureOfOtherRegionalAndCenterSupportCostsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the nature of expenses included in the category of other regional and center support costs.",
        "label": "Disclosure Of Other Regional And Center Support Costs Table Text Block",
        "terseLabel": "Components of other regional and center support costs"
       }
      }
     },
     "localname": "DisclosureOfOtherRegionalAndCenterSupportCostsTableTextBlock",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_DisclosureOfRecentAccountingPronouncementsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "NA",
        "label": "Recent accounting pronouncements"
       }
      }
     },
     "localname": "DisclosureOfRecentAccountingPronouncementsAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "xbrltype": "stringItemType"
    },
    "gbnh_DisclosureOfShareBasedPaymentAndWarrantsArrangementsTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Disclosure of information related to share based compensation and warrants.",
        "label": "Disclosure Of Share Based Payment And Warrants Arrangements Text Block",
        "terseLabel": "Contributed surplus"
       }
      }
     },
     "localname": "DisclosureOfShareBasedPaymentAndWarrantsArrangementsTextBlock",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplus"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_DiscountedCashFlows": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails": {
       "order": 1.0,
       "parentTag": "ifrs-full_LeaseLiabilities",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of the discounted cash flows for lease liabilities.",
        "label": "Discounted Cash Flows",
        "terseLabel": "Less discounted cash flows"
       }
      }
     },
     "localname": "DiscountedCashFlows",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_EarnOutConsiderationExpense": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 2.0,
       "parentTag": "ifrs-full_ProfitLossBeforeTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of expense for earn-out consideration incurred by the company.",
        "label": "Earn-Out Consideration Expense",
        "verboseLabel": "Earn-out consideration (note 13)"
       }
      }
     },
     "localname": "EarnOutConsiderationExpense",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_EarnOutConsiderationPaidInCash": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Earn Out Consideration Paid In Cash",
        "label": "Earn Out Consideration Paid In Cash",
        "verboseLabel": "Payment of earn-out consideration"
       }
      }
     },
     "localname": "EarnOutConsiderationPaidInCash",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_EarnOutConsiderationPayable": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of earn-out consideration payable.",
        "label": "Earn-out Consideration Payable",
        "terseLabel": "Earn-out consideration payable"
       }
      }
     },
     "localname": "EarnOutConsiderationPayable",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_EarningsBeforeInterestTaxesDepreciationAndAmortizationMarginPercentage": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The percentage of marging of earnings before interest, taxes, depreciation, and amortization (EBTDA).",
        "label": "Earnings Before Interest, Taxes, Depreciation, and Amortization Margin Percentage",
        "terseLabel": "EBITDA margin"
       }
      }
     },
     "localname": "EarningsBeforeInterestTaxesDepreciationAndAmortizationMarginPercentage",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_ExerciseOfBuyOutOptionsIntoPropertyPlantAndEquipment": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The exercise of buy-out options into property plant and equipment.",
        "label": "Exercise of Buy-out Options into Property Plant and Equipment",
        "terseLabel": "Exercise of buy-out options into property, plant and equipment"
       }
      }
     },
     "localname": "ExerciseOfBuyOutOptionsIntoPropertyPlantAndEquipment",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_ExpectedDividendAsPercentageWarrantsIssued": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The expected dividend yield used to calculate the fair value of options yield.",
        "label": "Expected Dividend As Percentage Warrants Issued",
        "terseLabel": "Expected dividend yield assumption"
       }
      }
     },
     "localname": "ExpectedDividendAsPercentageWarrantsIssued",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_ExpectedForfeitureShareOptionsGranted": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The expected forfeiture rate used to calculate the fair value of the share options granted.",
        "label": "Expected Forfeiture, Share Options Granted",
        "terseLabel": "Forfeiture rate assumption"
       }
      }
     },
     "localname": "ExpectedForfeitureShareOptionsGranted",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfShareOptionAwardsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_ExpectedForfeitureWarrantsIssued": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The expected forfeiture rate used to calculate the fair value of the warrants issued.",
        "label": "Expected Forfeiture Warrants Issued",
        "terseLabel": "Forfeiture rate assumption"
       }
      }
     },
     "localname": "ExpectedForfeitureWarrantsIssued",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_ExpectedRemainingLifeWarrantsIssued": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The expected remaining life of the warrants issued used to calculate the fair value.",
        "label": "Expected Remaining Life Warrants Issued",
        "terseLabel": "Remaining life assumption"
       }
      }
     },
     "localname": "ExpectedRemainingLifeWarrantsIssued",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_ExpectedVolatilityWarrantIssued": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The expected volatility of the share price used to calculate the fair value of the warrants issued.",
        "label": "Expected Volatility Warrant Issued",
        "terseLabel": "Volatility assumption"
       }
      }
     },
     "localname": "ExpectedVolatilityWarrantIssued",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_ExpenseByFunctionAxis": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.",
        "label": "Expense By Function [Axis]"
       }
      }
     },
     "localname": "ExpenseByFunctionAxis",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_ExpenseByFunctionDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This domain stands for the standard value for the 'Expenses by function' axis if no other member is used.",
        "label": "Expense By Function [Domain]"
       }
      }
     },
     "localname": "ExpenseByFunctionDomain",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_ExpensesByFunctionAxis": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Total of all expenses by function.",
        "label": "Expenses by function [axis]"
       }
      }
     },
     "localname": "ExpensesByFunctionAxis",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_ExpensesByFunctionMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information about expenses by function.",
        "label": "Expenses by function [member]"
       }
      }
     },
     "localname": "ExpensesByFunctionMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_ExpirationPeriodForBorrowing": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Period of time after closing in which draws on credit facility can be made.",
        "label": "Expiration period for borrowing",
        "verboseLabel": "Term of debt"
       }
      }
     },
     "localname": "ExpirationPeriodForBorrowing",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_FairValuePerShareOfWarrantsIssued": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Fair value per share of warrants granted.",
        "label": "Fair Value Per Share Of Warrants Issued",
        "terseLabel": "Fair value of warrants granted, per share"
       }
      }
     },
     "localname": "FairValuePerShareOfWarrantsIssued",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "gbnh_FairValueWarrantsIssued": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The aggregate fair value of the warrants issued.",
        "label": "Fair Value Warrants Issued",
        "terseLabel": "Aggregate fair value of warrants issued"
       }
      }
     },
     "localname": "FairValueWarrantsIssued",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_FairValueWarrantsOutstanding": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The aggregate fair value of the warrants outstanding.",
        "label": "Fair Value Warrants Outstanding",
        "terseLabel": "Aggregate fair value of warrants outstanding"
       }
      }
     },
     "localname": "FairValueWarrantsOutstanding",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_FeeForCashEarnOutConsiderationDeferred": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of fee for cash Earn-Out consideration deferred.",
        "label": "Fee for Cash Earn-Out Consideration Deferred",
        "terseLabel": "Deferral payment expense",
        "verboseLabel": "Additional earn-out cash consideration"
       }
      }
     },
     "localname": "FeeForCashEarnOutConsiderationDeferred",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_GreenbrookCguMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for Greenbrook CGU.",
        "label": "Greenbrook CGU"
       }
      }
     },
     "localname": "GreenbrookCguMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_GreenbrookTmsCentralFloridaLlcMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents Greenbrook TMS Central Florida LLC.",
        "label": "Greenbrook TMS Central Florida LLC"
       }
      }
     },
     "localname": "GreenbrookTmsCentralFloridaLlcMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_GreenbrookTmsClevelandLlcMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents Greenbrook TMS Cleveland Llc Member.",
        "label": "Greenbrook TMS Cleveland LLC"
       }
      }
     },
     "localname": "GreenbrookTmsClevelandLlcMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_GreenbrookTmsMichiganLlcMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents information pertaining to Greenbrook Tms Michigan Llc Member.",
        "label": "Greenbrook TMS Michigan LLC"
       }
      }
     },
     "localname": "GreenbrookTmsMichiganLlcMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_GreenbrookTmsNorthDetroitLlcMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents Greenbrook TMS North Detroit Llc Member.",
        "label": "Greenbrook TMS North Detroit LLC"
       }
      }
     },
     "localname": "GreenbrookTmsNorthDetroitLlcMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_GreenbrookTmsSouthCarolinaLlcMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents Greenbrook TMS South Carolina Llc Member.",
        "label": "Greenbrook TMS South Carolina LLC"
       }
      }
     },
     "localname": "GreenbrookTmsSouthCarolinaLlcMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_GreenbrookTmsSt.LouisLlcMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents Greenbrook TMS St. Louis Llc Member.",
        "label": "Greenbrook TMS St. Louis LLC"
       }
      }
     },
     "localname": "GreenbrookTmsSt.LouisLlcMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_GreenbrookTmsSt.PetersburgLlcMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents Greenbrook TMS St. Petersburg Llc Member.",
        "label": "Greenbrook TMS St. Petersburg LLC"
       }
      }
     },
     "localname": "GreenbrookTmsSt.PetersburgLlcMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_GreenbrookTmsTampaLlcMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents Greenbrook TMS Tampa LLC.",
        "label": "Greenbrook TMS Tampa LLC"
       }
      }
     },
     "localname": "GreenbrookTmsTampaLlcMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_GreybrookHealthInc.Member": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for the Greybrook Health Inc.",
        "label": "Greybrook Health Inc."
       }
      }
     },
     "localname": "GreybrookHealthInc.Member",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_IfrsAmortizationOfDebtIssuanceCosts": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of amortization expense attributable to debt issuance costs.",
        "label": "Ifrs Amortization of Debt Issuance Costs",
        "terseLabel": "Amortization of deferred transaction costs"
       }
      }
     },
     "localname": "IfrsAmortizationOfDebtIssuanceCosts",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_IfrsAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "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.",
        "label": "Ifrs Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount",
        "terseLabel": "Options excluded from the diluted calculation"
       }
      }
     },
     "localname": "IfrsAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShareDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_IfrsClassOfWarrantOrRightExercisePriceOfWarrantsOrRights": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Exercise price per share or per unit of warrants or rights outstanding.",
        "label": "Ifrs Class of Warrant or Right, Exercise Price of Warrants or Rights",
        "terseLabel": "Exercise price of warrant"
       }
      }
     },
     "localname": "IfrsClassOfWarrantOrRightExercisePriceOfWarrantsOrRights",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "gbnh_IfrsCommitmentsAndContingencies": {
     "auth_ref": [],
     "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": "Ifrs Commitments and Contingencies",
        "terseLabel": "Contingencies (note 16)"
       }
      }
     },
     "localname": "IfrsCommitmentsAndContingencies",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_IfrsDebtInstrumentDecreaseForgiveness": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 3.0,
       "parentTag": "ifrs-full_ProfitLossBeforeTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.",
        "label": "Ifrs Debt Instrument Decrease Forgiveness",
        "terseLabel": "Forgiveness of loan payable (note 10(a))"
       }
      }
     },
     "localname": "IfrsDebtInstrumentDecreaseForgiveness",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_IfrsDefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPay": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.",
        "label": "Ifrs Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay",
        "terseLabel": "Matching contribution percentage"
       }
      }
     },
     "localname": "IfrsDefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPay",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePensionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_IfrsEmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedPeriodForRecognition": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans",
        "label": "Ifrs Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition",
        "terseLabel": "Remaining average vesting period for unrecognized compensation"
       }
      }
     },
     "localname": "IfrsEmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedPeriodForRecognition",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfShareOptionAwardsDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_IfrsEmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedStockOptions": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Unrecognized cost of unvested options awarded to employees as compensation.",
        "label": "Ifrs Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options",
        "terseLabel": "Compensation cost not yet recognized"
       }
      }
     },
     "localname": "IfrsEmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedStockOptions",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfShareOptionAwardsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_IfrsFairValueAdjustmentOfWarrants": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of expense (income) related to adjustment to fair value of warrant liability.",
        "label": "Ifrs Fair Value Adjustment of Warrants",
        "terseLabel": "Change in fair value of the lender warrants"
       }
      }
     },
     "localname": "IfrsFairValueAdjustmentOfWarrants",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_IfrsIncomeLossAttributableToNoncontrollingInterestBeforeTax": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Income (loss) before tax attributed to noncontrolling interest.",
        "label": "Ifrs Income Loss Attributable To Noncontrolling Interest Before Tax",
        "verboseLabel": "(Deficit) Profit attributable to non-controlling interest"
       }
      }
     },
     "localname": "IfrsIncomeLossAttributableToNoncontrollingInterestBeforeTax",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_IfrsIncomeLossAttributableToParentBeforeTax": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Income (loss) before tax attributed to parent.",
        "label": "Ifrs Income (Loss) Attributable to Parent, before Tax",
        "verboseLabel": "(Deficit) Profit attributable to the shareholders of Greenbrook TMS"
       }
      }
     },
     "localname": "IfrsIncomeLossAttributableToParentBeforeTax",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_IfrsIncomeTaxDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "n/a",
        "label": "Income taxes."
       }
      }
     },
     "localname": "IfrsIncomeTaxDisclosureAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "xbrltype": "stringItemType"
    },
    "gbnh_IfrsLineOfCreditFacilityMaximumBorrowingCapacity": {
     "auth_ref": [],
     "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": "Ifrs Line Of Credit Facility Maximum Borrowing Capacity",
        "terseLabel": "Borrowing limit",
        "verboseLabel": "Maximum borrowing capacity"
       }
      }
     },
     "localname": "IfrsLineOfCreditFacilityMaximumBorrowingCapacity",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_IfrsLondonInterbankOfferedRateLiborMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Interest rate at which a bank borrows funds from other banks in the London interbank market.",
        "label": "30-day LIBOR"
       }
      }
     },
     "localname": "IfrsLondonInterbankOfferedRateLiborMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_IfrsNoncompeteAgreementsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Agreement in which one party agrees not to pursue a similar trade in competition with another party.",
        "label": "Covenants not to compete"
       }
      }
     },
     "localname": "IfrsNoncompeteAgreementsMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfIntangibleAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_IfrsPrivatePlacementMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Offering of stock to a limited number of sophisticated investors.",
        "label": "Private placement"
       }
      }
     },
     "localname": "IfrsPrivatePlacementMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails",
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_IfrsScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the reconciliation using dollar amounts of the reported amount of income tax expense to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.",
        "label": "Ifrs Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]",
        "terseLabel": "Schedule of reconciliation of income tax expense"
       }
      }
     },
     "localname": "IfrsScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The period of time over which a share based compensation award vests.",
        "label": "Ifrs Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period",
        "terseLabel": "Period over which options vest"
       }
      }
     },
     "localname": "IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The period of time after grant date when a share based compensation award expires.",
        "label": "Ifrs Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period",
        "terseLabel": "Expiry date"
       }
      }
     },
     "localname": "IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_IfrsSharesIssuedPricePerShare": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Per share price of stock sold.",
        "label": "Ifrs Shares Issued, Price Per Share",
        "terseLabel": "Offering price"
       }
      }
     },
     "localname": "IfrsSharesIssuedPricePerShare",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "gbnh_IfrsStockIssuedDuringPeriodSharesAcquisitions": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of shares of stock issued during the period pursuant to acquisitions.",
        "label": "Ifrs Stock Issued During Period, Shares, Acquisitions",
        "terseLabel": "Acquisition purchase price consideration",
        "verboseLabel": "Issuance of common shares - acquisition (shares)"
       }
      }
     },
     "localname": "IfrsStockIssuedDuringPeriodSharesAcquisitions",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_IfrsStockIssuedDuringPeriodSharesNewIssues": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of new stock issued during the period.",
        "label": "Ifrs Stock Issued During Period, Shares, New Issues",
        "terseLabel": "Share issuances",
        "verboseLabel": "Issuance of common shares - financing (shares)"
       }
      }
     },
     "localname": "IfrsStockIssuedDuringPeriodSharesNewIssues",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_IfrsStockIssuedDuringPeriodSharesStockOptionsExercised": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of shares of stock issued during the period pursuant to stock option exercises.",
        "label": "Ifrs Stock Issued During Period Shares Stock Options Exercised",
        "terseLabel": "Option exercise",
        "verboseLabel": "Exercise of stock options (shares)"
       }
      }
     },
     "localname": "IfrsStockIssuedDuringPeriodSharesStockOptionsExercised",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_IfrsStockOptionMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "An arrangement whereby an employee, director, officer or consultant 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.",
        "label": "Stock options"
       }
      }
     },
     "localname": "IfrsStockOptionMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_IfrsWarrantsAndRightsOutstanding": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 2.0,
       "parentTag": "ifrs-full_CurrentLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.",
        "label": "Ifrs Warrants and Rights Outstanding",
        "terseLabel": "Value of warrants",
        "verboseLabel": "Other payables (note 12)"
       }
      }
     },
     "localname": "IfrsWarrantsAndRightsOutstanding",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_IncreaseDecreaseInBankBorrowings": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of increase (decrease) in borrowings from banks during the period.",
        "label": "Increase (Decrease) In Bank Borrowings",
        "terseLabel": "Decrease in loans due to disposal of related TMS device"
       }
      }
     },
     "localname": "IncreaseDecreaseInBankBorrowings",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_IntangibleAssetDeferredTaxAssetMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents the deferred tax asset associated with  intangible assets.",
        "label": "Intangible assets",
        "terseLabel": "Intangible assets"
       }
      }
     },
     "localname": "IntangibleAssetDeferredTaxAssetMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_IssuanceOfStockUnitsUnderEquityIncentivePlans": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Issuance Of Stock Units Under Equity Incentive Plans",
        "label": "Issuance Of Stock Units Under Equity Incentive Plans",
        "terseLabel": "Issuance of RSU"
       }
      }
     },
     "localname": "IssuanceOfStockUnitsUnderEquityIncentivePlans",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_KeyManagementPersonnelCompensationPerformanceShareUnits": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsDetails": {
       "order": 2.0,
       "parentTag": "ifrs-full_KeyManagementPersonnelCompensation",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This element represents for key management personnel compensation share performance units.",
        "label": "Key Management Personnel Compensation Performance Share Units",
        "terseLabel": "Performance share units"
       }
      }
     },
     "localname": "KeyManagementPersonnelCompensationPerformanceShareUnits",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_LaterThanNineMonthsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for a time band of later than nine months.",
        "label": "270+"
       }
      }
     },
     "localname": "LaterThanNineMonthsMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_LaterThanSixMonthsAndNotLaterThanNineMonthsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for a time band of later than six month and not later than nine months.",
        "label": "181 - 270"
       }
      }
     },
     "localname": "LaterThanSixMonthsAndNotLaterThanNineMonthsMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_LenderWarrantMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for lender warrants.",
        "label": "Lender Warrants"
       }
      }
     },
     "localname": "LenderWarrantMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_LenderWarrantsAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Lender warrants, 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": "Lender Warrants, Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount",
        "terseLabel": "Lender warrants excluded from the diluted calculation"
       }
      }
     },
     "localname": "LenderWarrantsAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShareDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_ManagementServicesAgreementMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Agreement to provide management services.",
        "label": "Management services agreement"
       }
      }
     },
     "localname": "ManagementServicesAgreementMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfIntangibleAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_MaximumAmountOfBorrowingInEachTrancheOfBorrowingFacility": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Maximum borrowing in each tranche of the credit facility.",
        "label": "Maximum amount of borrowing in each tranche of borrowing facility",
        "terseLabel": "Borrowing limit in each tranche",
        "verboseLabel": "Maximum amount of borrowing in each tranche of borrowing facility"
       }
      }
     },
     "localname": "MaximumAmountOfBorrowingInEachTrancheOfBorrowingFacility",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_MinimumPercentageOfAnnualRetainerToBeReceivedInOtherEquityInstruments": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Minimum percentage of annual retainer to be received in other equity instruments.",
        "label": "Minimum Percentage Of Annual Retainer To Be Received In Other Equity Instruments",
        "terseLabel": "Minimum percentage of annual retainer to be received in share units plan"
       }
      }
     },
     "localname": "MinimumPercentageOfAnnualRetainerToBeReceivedInOtherEquityInstruments",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_NoncontrollingInterestLoansMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Loans from non-controlling interest partners to the reporting entity's subsidiaries.",
        "label": "Non-controlling interest loans"
       }
      }
     },
     "localname": "NoncontrollingInterestLoansMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableNonControllingInterestLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableTables"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_NumberOfBanksWithBorrowings": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The number of banks with which reporting entity has assumed loans.",
        "label": "Number of banks with borrowings",
        "terseLabel": "Number of banking institutions from whom loans were assumed"
       }
      }
     },
     "localname": "NumberOfBanksWithBorrowings",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "gbnh_NumberOfCentersAcquired": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of centers acquired in business combination.",
        "label": "Number of centers acquired",
        "terseLabel": "Number of TMS Centers acquired"
       }
      }
     },
     "localname": "NumberOfCentersAcquired",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "gbnh_NumberOfDaysConsideredForDeterminingAverageClosingPriceOfCommonSharesOnTorontoStockExchange": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of days considered for determining average closing price of common shares on toronto stock exchange.",
        "label": "Number of Days Considered for Determining Average Closing Price of Common Shares On Toronto Stock Exchange",
        "terseLabel": "Number of days considered for determining average closing price of common shares on toronto stock exchange"
       }
      }
     },
     "localname": "NumberOfDaysConsideredForDeterminingAverageClosingPriceOfCommonSharesOnTorontoStockExchange",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_NumberOfOtherEquityInstrumentsExpectedToBeVestedOnVestingDate": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of other equity instruments expected to be vested on vesting date in the share-based arrangement.",
        "label": "Number Of Other Equity Instruments Expected To Be Vested On Vesting Date",
        "terseLabel": "Number of units expected to be vested on vesting date"
       }
      }
     },
     "localname": "NumberOfOtherEquityInstrumentsExpectedToBeVestedOnVestingDate",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_NumberOfOutstandingWarrants": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of outstanding warrants.",
        "label": "Number Of Outstanding Warrants",
        "periodEndLabel": "Outstanding, end of year",
        "periodStartLabel": "Outstanding, beginning of year (price per share)"
       }
      }
     },
     "localname": "NumberOfOutstandingWarrants",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusBrokerWarrantsDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_NumberOfReportableSegment": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of segments reported by the entity.",
        "label": "Number of reportable segment",
        "terseLabel": "Number of reportable segments"
       }
      }
     },
     "localname": "NumberOfReportableSegment",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesAdditionalInformationDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "gbnh_NumberOfSharesCalledByEachWarrant": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of shares each warrant converts into.",
        "label": "Number Of Shares Called By Each Warrant",
        "terseLabel": "Number of shares each warrant converts into"
       }
      }
     },
     "localname": "NumberOfSharesCalledByEachWarrant",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_NumberOfTradingDaysPriorToIssuanceDateForTradingDaysConsideredForDeterminingAverageClosingPriceOfCommonSharesOnTorontoStockExchange": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of trading days prior to issuance date for trading days considered for determining average closing price of common shares on toronto stock exchange.",
        "label": "Number Of Trading Days Prior To Issuance Date For Trading Days Considered For Determining Average Closing Price Of Common Shares On Toronto Stock Exchange",
        "terseLabel": "Number of trading days prior to issuance date"
       }
      }
     },
     "localname": "NumberOfTradingDaysPriorToIssuanceDateForTradingDaysConsideredForDeterminingAverageClosingPriceOfCommonSharesOnTorontoStockExchange",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_NumberOfTranchesInCreditFacility": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of tranches in which the credit facility can be drawn down.",
        "label": "Number of tranches in credit facility",
        "terseLabel": "Number of tranches"
       }
      }
     },
     "localname": "NumberOfTranchesInCreditFacility",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "gbnh_NumberOfWarrantsExercised": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number Of Warrants Exercised.",
        "label": "Number Of Warrants Exercised",
        "terseLabel": "Exercised"
       }
      }
     },
     "localname": "NumberOfWarrantsExercised",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusBrokerWarrantsDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_NumberOfWarrantsExpired": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of warrants expired during the period.",
        "label": "Number Of Warrants Expired",
        "terseLabel": "Expired"
       }
      }
     },
     "localname": "NumberOfWarrantsExpired",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusBrokerWarrantsDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_NumberOfWarrantsIssued": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of warrants issued.",
        "label": "Number Of Warrants Issued",
        "terseLabel": "Granted",
        "verboseLabel": "Warrants issued"
       }
      }
     },
     "localname": "NumberOfWarrantsIssued",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusBrokerWarrantsDetails",
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_OtherRegionalAndSupportCenterCostsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Other regional and support center costs.",
        "label": "Other regional and support center"
       }
      }
     },
     "localname": "OtherRegionalAndSupportCenterCostsMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_PaycheckProtectionProgramLoanMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for paycheck protection program loan.",
        "label": "Paycheck protection program loan"
       }
      }
     },
     "localname": "PaycheckProtectionProgramLoanMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_PaymentsForAcquisitionOfSubsidiaryNonControllingInterest": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 6.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cash outflow of payments for acquisition of subsidiary non-controlling interest.",
        "label": "Payments For Acquisition Of Subsidiary Non-controlling Interest",
        "negatedLabel": "Acquisition of subsidiary non-controlling interest"
       }
      }
     },
     "localname": "PaymentsForAcquisitionOfSubsidiaryNonControllingInterest",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_PaymentsForDeferredAndContingentConsideration": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 3.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cash outflow for payment of deferred and contingent considerations.",
        "label": "Payments For Deferred And Contingent Consideration",
        "negatedLabel": "Deferred and contingent consideration paid",
        "terseLabel": "Deferred and contingent consideration paid"
       }
      }
     },
     "localname": "PaymentsForDeferredAndContingentConsideration",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_PercentageOfAdditionalLenderWarrantsRequiredToBeIssues": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Percentage of additional lender warrants required to be issues.",
        "label": "Percentage of Additional Lender Warrants Required to be Issues",
        "terseLabel": "Percentage of additional lender warrants required to be issues"
       }
      }
     },
     "localname": "PercentageOfAdditionalLenderWarrantsRequiredToBeIssues",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_PercentageOfBudgetedRevenueGrowthRate": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The percentage of budgeted revenue growth rate.",
        "label": "Percentage of Budgeted Revenue Growth Rate",
        "terseLabel": "Budgeted revenue growth rate"
       }
      }
     },
     "localname": "PercentageOfBudgetedRevenueGrowthRate",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_PercentageOfOutstandingOrdinarySharesToBeHeldEitherDirectlyOrIndirectly": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Condition of percentage of outstanding ordinary shares to be held wither directly or indirectly.",
        "label": "Percentage of Outstanding Ordinary shares to be held Either Directly Or Indirectly",
        "terseLabel": "Percentage of Outstanding common shares to be held"
       }
      }
     },
     "localname": "PercentageOfOutstandingOrdinarySharesToBeHeldEitherDirectlyOrIndirectly",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_PercentageOfPrincipalAmountOutstandingAmortized": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents the percentage of principal amount outstanding amortized.",
        "label": "Percentage of Principal Amount Outstanding Amortized",
        "verboseLabel": "Percentage of principal amount outstanding amortized"
       }
      }
     },
     "localname": "PercentageOfPrincipalAmountOutstandingAmortized",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_PerformanceShareUnitsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "This member stands for the performance share units.",
        "label": "Performance Share Units"
       }
      }
     },
     "localname": "PerformanceShareUnitsMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesTables"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_PeriodForSettlementOfOtherEquityInstrumentsFromElectedRedemptionDate": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Period within which the entity will settle the other equity instruments arrangements from the redemption date elected by the other party.",
        "label": "Period For The Settlement Of Other Equity Instruments From The Elected Redemption Date",
        "terseLabel": "Period for settlement from elected redemption date"
       }
      }
     },
     "localname": "PeriodForSettlementOfOtherEquityInstrumentsFromElectedRedemptionDate",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_ProceedsFromBankBorrowingsClassifiedAsFinancingActivities": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 6.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Proceeds from bank borrowings.",
        "label": "Proceeds from bank borrowings, classified as financing activities",
        "terseLabel": "Bank loans advanced (note 10(a))"
       }
      }
     },
     "localname": "ProceedsFromBankBorrowingsClassifiedAsFinancingActivities",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_ProceedsFromContributionsOfNoncontrollingInterests1": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 7.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The cash inflow from proceeds from contributions of non-controlling interests. [Refer: Non-controlling interests]",
        "label": "Proceeds From Contributions Of Noncontrolling Interests1",
        "verboseLabel": "Non-controlling interest subsidiary investment"
       }
      }
     },
     "localname": "ProceedsFromContributionsOfNoncontrollingInterests1",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_ProfitLossAttributableToOrdinaryEquityHoldersOfParentsEntity": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Amount of profit loss attributable to ordinary equity holders of parent entity",
        "label": "Profit Loss Attributable To Ordinary Equity Holders Of Parents Entity",
        "terseLabel": "Accounting Net Loss before income tax - Greenbrook TMS"
       }
      }
     },
     "localname": "ProfitLossAttributableToOrdinaryEquityHoldersOfParentsEntity",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_PropertyPlantAndEquipmentUnusedTaxAssetMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents the unused tax asset associated with property plant and equipment.",
        "label": "Property, plant and equipment"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentUnusedTaxAssetMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesUnusedTaxAssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_PublicOfferingMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Public offering of stock to investors.",
        "label": "Public offering"
       }
      }
     },
     "localname": "PublicOfferingMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_PurchasePriceOfCommonShares": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents of Purchase Price Of Common Shares.",
        "label": "Purchase Price Of Common Shares",
        "terseLabel": "Purchase price of common shares"
       }
      }
     },
     "localname": "PurchasePriceOfCommonShares",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "gbnh_ReconciliationOfNumberOfOptionsOutstandingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Reconciliation of number of options outstanding abstract",
        "label": "Reconciliation of number of options outstanding abstract",
        "terseLabel": "Number of stock"
       }
      }
     },
     "localname": "ReconciliationOfNumberOfOptionsOutstandingAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_ReconciliationOfNumberOfWarrantsOutstandingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Reconciliation of number of warrants outstanding abstract",
        "label": "Number of broker warrants"
       }
      }
     },
     "localname": "ReconciliationOfNumberOfWarrantsOutstandingAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusBrokerWarrantsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_ReconciliationOfValueOfSharesOutstandingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Reconciliation Of Value Of Shares Outstanding Abstract",
        "label": "Total amount (in dollars)"
       }
      }
     },
     "localname": "ReconciliationOfValueOfSharesOutstandingAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_ReconciliationOfWeightedAverageExercisePriceForOptionsOutstandingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Reconciliation of weighted average exercise price for options outstanding abstract",
        "label": "Reconciliation Of Weighted Average Exercise Price For Options Outstanding [Abstract]",
        "terseLabel": "Weighted average exercise price"
       }
      }
     },
     "localname": "ReconciliationOfWeightedAverageExercisePriceForOptionsOutstandingAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_ReconciliationOfWeightedAverageExercisePriceForWarrantsOutstandingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Reconciliation of weighted average exercise price for warrants outstanding abstract",
        "label": "Reconciliation Of Weighted Average Exercise Price For Warrants Outstanding [Abstract]",
        "verboseLabel": "Weighted average exercise price"
       }
      }
     },
     "localname": "ReconciliationOfWeightedAverageExercisePriceForWarrantsOutstandingAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusBrokerWarrantsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_RedemptionOfWarrants": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of redemption of warrants.",
        "label": "Redemption of Warrants",
        "negatedLabel": "Redemption of warrants (note 14)"
       }
      }
     },
     "localname": "RedemptionOfWarrants",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_RedemptionOfWarrantsShares": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The number of shares associated with redemption of warrants.",
        "label": "Redemption Of Warrants, Shares",
        "terseLabel": "Redemption of warrants (note 14) (in shares)"
       }
      }
     },
     "localname": "RedemptionOfWarrantsShares",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_RegionalAndCenterSupportCosts": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 3.0,
       "parentTag": "ifrs-full_CostOfSales",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Regionals and center support costs.",
        "label": "Regional and Center Support Costs",
        "terseLabel": "Other regional and center support costs (note 24)"
       }
      }
     },
     "localname": "RegionalAndCenterSupportCosts",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_RemainingBalanceOfDeferredConsiderationFundsHeldInEscrowAccount": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of remaining balance of deferred consideration funds held in escrow account.",
        "label": "Remaining Balance of Deferred Consideration Funds Held in Escrow Account",
        "terseLabel": "Remaining balance in deferred consideration funds held in escrow account"
       }
      }
     },
     "localname": "RemainingBalanceOfDeferredConsiderationFundsHeldInEscrowAccount",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_RepaymentsOfBankBorrowingsClassifiedAsFinancingActivities": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 7.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Repayments of bank borrowings.",
        "label": "Repayments of bank borrowings, classified as financing activities",
        "negatedLabel": "Bank loans repaid (note 10(a))",
        "verboseLabel": "Repayments"
       }
      }
     },
     "localname": "RepaymentsOfBankBorrowingsClassifiedAsFinancingActivities",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_RestrictedSharesUnitsMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information related to RSU",
        "label": "Restricted Shares Units [Member]"
       }
      }
     },
     "localname": "RestrictedSharesUnitsMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_RightOfUseAssetsRecognisedAsOfAcquisitionDate": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 8.0,
       "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount recognised as of the acquisition date for right-of-use assets acquired in a business combination.",
        "label": "Right-of-use Assets Recognised as of Acquisition Date",
        "terseLabel": "Right-of-use assets"
       }
      }
     },
     "localname": "RightOfUseAssetsRecognisedAsOfAcquisitionDate",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_RiskFreeInterestRateWarrantsIssued": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The risk-free interest rate assumption used to calculate the fair value of the warrants issued.",
        "label": "Risk Free Interest Rate Warrants Issued",
        "terseLabel": "Annual risk-free interest rate assumption"
       }
      }
     },
     "localname": "RiskFreeInterestRateWarrantsIssued",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_ScheduleOfConsolidatedAmountsForSubsidiariesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of amounts related to consolidated subsidiaries",
        "label": "Schedule Of Consolidated Amounts For Subsidiaries Table Text Block",
        "terseLabel": "Consolidated amounts for subsidiaries"
       }
      }
     },
     "localname": "ScheduleOfConsolidatedAmountsForSubsidiariesTableTextBlock",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_ScheduleOfTradeAndOtherPayablesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tabular disclosure of the components of trade and other payables.",
        "label": "Schedule Of Trade and Other Payables Table Text Block",
        "terseLabel": "Components of trade and other payables"
       }
      }
     },
     "localname": "ScheduleOfTradeAndOtherPayablesTableTextBlock",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_ScheduleOfWarrantsOrRightsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The tabular disclosure of warrants and rights outstanding.",
        "label": "Schedule of Warrants or Rights [Table Text Block]",
        "verboseLabel": "Schedule of lender warrants"
       }
      }
     },
     "localname": "ScheduleOfWarrantsOrRightsTableTextBlock",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "gbnh_SecuredCreditFacilityDelayedDrawTermLoanMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Delayed draw portion of the secured credit facility.",
        "label": "Delayed Draw Term Loan"
       }
      }
     },
     "localname": "SecuredCreditFacilityDelayedDrawTermLoanMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_SecuredCreditFacilityMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Secured credit facility.",
        "label": "New Credit Facility"
       }
      }
     },
     "localname": "SecuredCreditFacilityMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails",
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_SecuredCreditFacilityTermLoanMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Term loan portion of the secured credit facility.",
        "label": "Term Loan"
       }
      }
     },
     "localname": "SecuredCreditFacilityTermLoanMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_ShareIssuanceCostPaidInWarrants": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents the portion of share issuance costs paid by issuance of warrants.",
        "label": "Share Issuance Cost Paid In Warrants",
        "terseLabel": "Portion of share transaction costs paid in warrants"
       }
      }
     },
     "localname": "ShareIssuanceCostPaidInWarrants",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_SharesReservedForIssuance": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The number of shares reserved for issuance for a share based compensation arrangement.",
        "label": "Shares Reserved For Issuance",
        "terseLabel": "Shares reserved for issuance for options"
       }
      }
     },
     "localname": "SharesReservedForIssuance",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_SharesReservedForIssuanceAsPercentageOfOutstandingShares": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The number of shares reserved for issuance expressed as a percentage of the number of outstanding shares.",
        "label": "Shares Reserved For Issuance As Percentage Of Outstanding Shares",
        "terseLabel": "Shares reserved for issuance, as percent of outstanding shares"
       }
      }
     },
     "localname": "SharesReservedForIssuanceAsPercentageOfOutstandingShares",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "gbnh_StockIssuedDuringPeriodSharesEarnOutSettlement": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of shares of stock issued as a result of settlement of contingent consideration payable upon satisfaction of earn-out considerations.",
        "label": "Stock Issued During Period, Shares, Earn-out Settlement",
        "terseLabel": "Settlement of contingent consideration in shares",
        "verboseLabel": "Number of shares issued in earn-out"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodSharesEarnOutSettlement",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_StockIssuedDuringPeriodSharesWarrantsExercised": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Number of shares of stock issued as a result of the exercise of warrants.",
        "label": "Stock Issued During Period, Shares, Warrants Exercised",
        "terseLabel": "Redemption of warrants (in dollars)"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodSharesWarrantsExercised",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_StockIssuedDuringPeriodValueEarnOutSettlement": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The increase in equity as a result of settlement of contingent consideration payable upon satisfaction of earn-out considerations.",
        "label": "Stock Issued During Period, Value, Earn-out Settlement",
        "terseLabel": "Settlement of contingent consideration in shares (in dollars)",
        "verboseLabel": "Aggregate value of shares issued in earn-out"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueEarnOutSettlement",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_SummaryOfSignificantAccountingPoliciesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "NA",
        "label": "Significant accounting policies"
       }
      }
     },
     "localname": "SummaryOfSignificantAccountingPoliciesAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "xbrltype": "stringItemType"
    },
    "gbnh_TaxEffectOfExpenseIncomeNotDeductibleInDeterminingTaxableProfitTaxLoss": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Tax effect of expense income not deductible in determining taxable profit tax loss.",
        "label": "Tax Effect Of Expense Income Not Deductible In Determining Taxable Profit Tax Loss",
        "terseLabel": "Non-deductible expenses and other permanent differences"
       }
      }
     },
     "localname": "TaxEffectOfExpenseIncomeNotDeductibleInDeterminingTaxableProfitTaxLoss",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_TaxEffectOfNoncontrollingInterest": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to noncontrolling interest in determining taxable profit (tax loss).",
        "label": "Tax Effect Of Noncontrolling Interest",
        "terseLabel": "Non-controlling interest"
       }
      }
     },
     "localname": "TaxEffectOfNoncontrollingInterest",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_TemporaryDifferencePropertyPlantAndEquipmentMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Represents the temporary difference associated with property plant and equipment.",
        "label": "Book value in excess of tax costs"
       }
      }
     },
     "localname": "TemporaryDifferencePropertyPlantAndEquipmentMember",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesUnusedTaxAssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_TermOfContract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The period of time of the contract.",
        "label": "Term Of Contract",
        "terseLabel": "Term of agreement"
       }
      }
     },
     "localname": "TermOfContract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_TransactionCosts": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of transaction costs incurred.",
        "label": "Transaction Costs",
        "terseLabel": "Transaction costs incurred"
       }
      }
     },
     "localname": "TransactionCosts",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_TypeOfIssuanceOfStockAxis": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Information about the form of sale of stock.",
        "label": "Type of Issuance of Stock Axis"
       }
      }
     },
     "localname": "TypeOfIssuanceOfStockAxis",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails",
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_TypeOfIssuanceOfStockDomain": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Sale of the reporting entity's stock",
        "label": "Type of Issuance Of Stock Domain"
       }
      }
     },
     "localname": "TypeOfIssuanceOfStockDomain",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails",
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "gbnh_UnrecognizedCompensationCostAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Unrecognized compensation cost abstract",
        "label": "Unrecognized compensation cost"
       }
      }
     },
     "localname": "UnrecognizedCompensationCostAbstract",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfShareOptionAwardsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "gbnh_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognisedExpireBetween2033And2040": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The unused tax losses for which no deferred tax asset recognised subject to epire between 2033 and 2040.",
        "label": "Unused Tax Losses for which No Deferred Tax Asset Recognised, Expire Between 2033 and 2040",
        "terseLabel": "Operating tax loss carry-forwards that will expire between 2033 and 2040"
       }
      }
     },
     "localname": "UnusedTaxLossesForWhichNoDeferredTaxAssetRecognisedExpireBetween2033And2040",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "gbnh_WarrantExercisePrice": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Exercise price of each warrant.",
        "label": "Warrant Exercise Price",
        "terseLabel": "Warrant exercise price"
       }
      }
     },
     "localname": "WarrantExercisePrice",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "gbnh_WarrantExpirationPeriod": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The period of time after issuance over which the warrant expires.",
        "label": "Warrant Expiration Period",
        "terseLabel": "Warrant expiration period"
       }
      }
     },
     "localname": "WarrantExpirationPeriod",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_WarrantsExercisable": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The number of warrants exercisable.",
        "label": "Warrants exercisable",
        "terseLabel": "Warrants exercisable"
       }
      }
     },
     "localname": "WarrantsExercisable",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "gbnh_WeightedAverageExercisePriceOfWarrantsExpired": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average exercise price of warrants expired during the period.",
        "label": "Weighted Average Exercise Price Of Warrants Expired",
        "terseLabel": "Expired (price per share)"
       }
      }
     },
     "localname": "WeightedAverageExercisePriceOfWarrantsExpired",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusBrokerWarrantsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "gbnh_WeightedAverageExercisePriceOfWarrantsIssued": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average exercise price of warrants issued during the period.",
        "label": "Weighted Average Exercise Price Of Warrants Issued",
        "terseLabel": "Granted (price per share)"
       }
      }
     },
     "localname": "WeightedAverageExercisePriceOfWarrantsIssued",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusBrokerWarrantsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "gbnh_WeightedAverageExercisePriceOfWarrantsOutstanding": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted average exercise price of warrants outstanding.",
        "label": "Weighted Average Exercise Price Of Warrants Outstanding",
        "periodEndLabel": "Outstanding, end of year (price per share)",
        "periodStartLabel": "Outstanding, beginning of year (price per share)"
       }
      }
     },
     "localname": "WeightedAverageExercisePriceOfWarrantsOutstanding",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusBrokerWarrantsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "gbnh_WeightedAverageRemainingContractualLifeOfOutstandingWarrants": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The weighted average remaining contractual life of outstanding warrants.",
        "label": "Weighted average remaining contractual life of outstanding warrants",
        "terseLabel": "Weighted average contractual life of warrants"
       }
      }
     },
     "localname": "WeightedAverageRemainingContractualLifeOfOutstandingWarrants",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "gbnh_Weightedaverageexercisepriceofwarrantsexercised": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "documentation": "Weighted Average Exercise Price Of Warrants Exercised.",
        "label": "WeightedAverageExercisePriceOfWarrantsExercised",
        "terseLabel": "Exercised (Price per share)"
       }
      }
     },
     "localname": "Weightedaverageexercisepriceofwarrantsexercised",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusBrokerWarrantsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "gbnh_WorkingCapitalAdjustmentOfConsiderationTransferredInBusinessCombination": {
     "auth_ref": [],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 3.0,
       "parentTag": "ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-us": {
       "role": {
        "documentation": "The amount of working capital adjustment of consideration transferred in a business combination.",
        "label": "Working Capital Adjustment of Consideration Transferred in Business Combination",
        "negatedLabel": "Working capital adjustment"
       }
      }
     },
     "localname": "WorkingCapitalAdjustmentOfConsiderationTransferredInBusinessCombination",
     "nsuri": "http://www.greenbrooktms.com/20211231",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AccountingProfit": {
     "auth_ref": [
      "r36",
      "r37"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Accounting profit",
        "verboseLabel": "Accounting Net Loss before income tax"
       }
      }
     },
     "localname": "AccountingProfit",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AccrualsClassifiedAsCurrent": {
     "auth_ref": [
      "r25"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesDetails": {
       "order": 2.0,
       "parentTag": "ifrs-full_TradeAndOtherCurrentPayables",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of accruals classified as current. [Refer: Accruals]"
       }
      },
      "en-us": {
       "role": {
        "label": "Accruals classified as current",
        "terseLabel": "Accrued liabilities"
       }
      }
     },
     "localname": "AccrualsClassifiedAsCurrent",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember": {
     "auth_ref": [
      "r46",
      "r53",
      "r92",
      "r99",
      "r102"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for accumulated depreciation, amortisation and impairment. [Refer: Impairment loss; Depreciation and amortisation expense]"
       }
      },
      "en-us": {
       "role": {
        "label": "Accumulated amortization"
       }
      }
     },
     "localname": "AccumulatedDepreciationAmortisationAndImpairmentMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_AccumulatedImpairmentMember": {
     "auth_ref": [
      "r46",
      "r92",
      "r99",
      "r102",
      "r186",
      "r195",
      "r199",
      "r235",
      "r239"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for accumulated impairment. [Refer: Impairment loss]"
       }
      },
      "en-us": {
       "role": {
        "label": "Impairment"
       }
      }
     },
     "localname": "AccumulatedImpairmentMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred": {
     "auth_ref": [
      "r176"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Consideration transferred, acquisition-date fair value",
        "terseLabel": "Purchase price",
        "totalLabel": "Purchase price"
       }
      }
     },
     "localname": "AcquisitiondateFairValueOfTotalConsiderationTransferred",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Acquisition-date fair value of total consideration transferred [abstract]",
        "terseLabel": "Purchase consideration"
       }
      }
     },
     "localname": "AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill": {
     "auth_ref": [
      "r93"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill]"
       }
      },
      "en-us": {
       "role": {
        "label": "Acquisitions through business combinations, intangible assets other than goodwill",
        "terseLabel": "Additions"
       }
      }
     },
     "localname": "AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdditionalRecognitionGoodwill": {
     "auth_ref": [
      "r184"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of additional goodwill recognised, except goodwill included in a disposal group that, on acquisition, meets the criteria to be classified as held for sale in accordance with IFRS 5. [Refer: Goodwill; Disposal groups classified as held for sale [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Additional recognition, goodwill",
        "terseLabel": "Additions"
       }
      }
     },
     "localname": "AdditionalRecognitionGoodwill",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment": {
     "auth_ref": [
      "r47"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment]"
       }
      },
      "en-us": {
       "role": {
        "label": "Additions other than through business combinations, property, plant and equipment",
        "terseLabel": "Additions"
       }
      }
     },
     "localname": "AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdditionsToRightofuseAssets": {
     "auth_ref": [
      "r150"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of additions to right-of-use assets. [Refer: Right-of-use assets]"
       }
      },
      "en-us": {
       "role": {
        "label": "Additions to right-of-use assets",
        "terseLabel": "Additions to right-of-use assets"
       }
      }
     },
     "localname": "AdditionsToRightofuseAssets",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdjustmentsForAmortisationExpense": {
     "auth_ref": [
      "r112"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 2.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Adjustments for amortisation expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss); Depreciation and amortisation expense]"
       }
      },
      "en-us": {
       "role": {
        "label": "Adjustments for amortisation expense",
        "terseLabel": "Amortization"
       }
      }
     },
     "localname": "AdjustmentsForAmortisationExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdjustmentsForDecreaseIncreaseInInventories": {
     "auth_ref": [
      "r110"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 11.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Adjustments for decrease (increase) in inventories to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Inventories; Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Adjustments for decrease (increase) in inventories",
        "terseLabel": "Accounts receivable"
       }
      }
     },
     "localname": "AdjustmentsForDecreaseIncreaseInInventories",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdjustmentsForDepreciationExpense": {
     "auth_ref": [
      "r112"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 3.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Adjustments for depreciation expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Adjustments for depreciation expense",
        "terseLabel": "Depreciation"
       }
      }
     },
     "localname": "AdjustmentsForDepreciationExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables": {
     "auth_ref": [
      "r110"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 15.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Adjustments for increase (decrease) in other operating payables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Adjustments for increase (decrease) in other operating payables",
        "terseLabel": "Other payables"
       }
      }
     },
     "localname": "AdjustmentsForIncreaseDecreaseInOtherOperatingPayables",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables": {
     "auth_ref": [
      "r112"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 13.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Adjustments for increase (decrease) in trade and other payables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Trade and other payables; Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Adjustments for increase (decrease) in trade and other payables",
        "terseLabel": "Accounts payable and accrued liabilities"
       }
      }
     },
     "localname": "AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdjustmentsForInterestExpense": {
     "auth_ref": [
      "r112"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 4.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Adjustments for interest expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Interest expense; Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Adjustments for interest expense",
        "terseLabel": "Interest expense"
       }
      }
     },
     "localname": "AdjustmentsForInterestExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdjustmentsForInterestIncome": {
     "auth_ref": [
      "r112"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 5.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Adjustments for interest income expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Interest income; Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Adjustments for interest income",
        "negatedLabel": "Interest income"
       }
      }
     },
     "localname": "AdjustmentsForInterestIncome",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdjustmentsForProvisions": {
     "auth_ref": [
      "r111"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 14.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Adjustments for provisions to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Provisions; Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Adjustments for provisions",
        "terseLabel": "Provisions"
       }
      }
     },
     "localname": "AdjustmentsForProvisions",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AdjustmentsForReconcileProfitLossAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Adjustments to reconcile profit (loss) [abstract]",
        "terseLabel": "Adjusted for:"
       }
      }
     },
     "localname": "AdjustmentsForReconcileProfitLossAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_AdjustmentsForSharebasedPayments": {
     "auth_ref": [
      "r111"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 6.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Adjustments for share-based payments to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Adjustments for share-based payments",
        "terseLabel": "Share-based compensation"
       }
      }
     },
     "localname": "AdjustmentsForSharebasedPayments",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AggregatedTimeBandsMember": {
     "auth_ref": [
      "r19",
      "r56",
      "r145",
      "r155",
      "r156",
      "r192",
      "r208",
      "r214",
      "r225",
      "r226",
      "r228",
      "r229"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for aggregated time bands. It also represents the standard value for the 'Maturity' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Aggregated time bands [member]"
       }
      }
     },
     "localname": "AggregatedTimeBandsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_AmortisationExpense": {
     "auth_ref": [
      "r9"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 5.0,
       "parentTag": "ifrs-full_ProfitLossBeforeTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives."
       }
      },
      "en-us": {
       "role": {
        "label": "Amortisation expense",
        "terseLabel": "Amortization (note 7)"
       }
      }
     },
     "localname": "AmortisationExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill": {
     "auth_ref": [
      "r94"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill]"
       }
      },
      "en-us": {
       "role": {
        "label": "Amortisation, intangible assets other than goodwill",
        "terseLabel": "Amortization"
       }
      }
     },
     "localname": "AmortisationIntangibleAssetsOtherThanGoodwill",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AmountsPayableRelatedPartyTransactions": {
     "auth_ref": [
      "r64",
      "r67"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amounts payable resulting from related party transactions. [Refer: Related parties [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Amounts payable, related party transactions",
        "terseLabel": "Trade and other payable for management services"
       }
      }
     },
     "localname": "AmountsPayableRelatedPartyTransactions",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]",
        "terseLabel": "Net assets acquired"
       }
      }
     },
     "localname": "AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ApplicableTaxRate": {
     "auth_ref": [
      "r37"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The applicable income tax rate."
       }
      },
      "en-us": {
       "role": {
        "label": "Applicable tax rate",
        "terseLabel": "Statutory rate"
       }
      }
     },
     "localname": "ApplicableTaxRate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ifrs-full_Assets": {
     "auth_ref": [
      "r17",
      "r136",
      "r137",
      "r138",
      "r219",
      "r221"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits."
       }
      },
      "en-us": {
       "role": {
        "label": "Assets",
        "totalLabel": "Total assets"
       }
      }
     },
     "localname": "Assets",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_AssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Assets [abstract]",
        "terseLabel": "Assets"
       }
      }
     },
     "localname": "AssetsAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_BankBorrowingsUndiscountedCashFlows": {
     "auth_ref": [
      "r210",
      "r215"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of contractual undiscounted cash flows in relation to bank borrowings. [Refer: Borrowings]"
       }
      },
      "en-us": {
       "role": {
        "label": "Bank borrowings, undiscounted cash flows",
        "terseLabel": "Total Cash Payments"
       }
      }
     },
     "localname": "BankBorrowingsUndiscountedCashFlows",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_BasicEarningsLossPerShare": {
     "auth_ref": [
      "r73",
      "r74"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator)."
       }
      },
      "en-us": {
       "role": {
        "label": "Basic earnings (loss) per share",
        "terseLabel": "Basic",
        "verboseLabel": "Loss per share: Basic"
       }
      }
     },
     "localname": "BasicEarningsLossPerShare",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShareDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "perShareItemType"
    },
    "ifrs-full_Borrowings": {
     "auth_ref": [
      "r17"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of outstanding funds that the entity is obligated to repay."
       }
      },
      "en-us": {
       "role": {
        "label": "Borrowings",
        "terseLabel": "Bank loans",
        "totalLabel": "Bank loans",
        "verboseLabel": "Carrying amount"
       }
      }
     },
     "localname": "Borrowings",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_BorrowingsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Loans payable"
       }
      }
     },
     "localname": "BorrowingsAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_BorrowingsAdjustmentToInterestRateBasis": {
     "auth_ref": [
      "r206"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]"
       }
      },
      "en-us": {
       "role": {
        "label": "Borrowings, adjustment to interest rate basis",
        "verboseLabel": "Spread on variable rate"
       }
      }
     },
     "localname": "BorrowingsAdjustmentToInterestRateBasis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ifrs-full_BorrowingsByNameAxis": {
     "auth_ref": [
      "r206"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Borrowings by name [axis]"
       }
      }
     },
     "localname": "BorrowingsByNameAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableNonControllingInterestLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableTables",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails",
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_BorrowingsByNameMember": {
     "auth_ref": [
      "r206"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for all borrowings when disaggregated by name. It also represents the standard value for the 'Borrowings by name' axis if no other member is used. [Refer: Borrowings]"
       }
      },
      "en-us": {
       "role": {
        "label": "Borrowings by name [member]"
       }
      }
     },
     "localname": "BorrowingsByNameMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableNonControllingInterestLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableTables",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails",
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_BorrowingsInterestRate": {
     "auth_ref": [
      "r206"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The interest rate on borrowings. [Refer: Borrowings]"
       }
      },
      "en-us": {
       "role": {
        "label": "Borrowings, interest rate",
        "terseLabel": "Incremental borrowing rate"
       }
      }
     },
     "localname": "BorrowingsInterestRate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableNonControllingInterestLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesLeaseLiabilitiesDetails",
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ifrs-full_BottomOfRangeMember": {
     "auth_ref": [
      "r140",
      "r141",
      "r142",
      "r166",
      "r206",
      "r228"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for the bottom of a range."
       }
      },
      "en-us": {
       "role": {
        "label": "Minimum"
       }
      }
     },
     "localname": "BottomOfRangeMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_BusinessCombinationsAxis": {
     "auth_ref": [
      "r182"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Business combinations [axis]"
       }
      }
     },
     "localname": "BusinessCombinationsAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsTables",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis": {
     "auth_ref": [
      "r46",
      "r50",
      "r92",
      "r95",
      "r98",
      "r99",
      "r100",
      "r101",
      "r102",
      "r186",
      "r195",
      "r196",
      "r235",
      "r240"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]"
       }
      }
     },
     "localname": "CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_CarryingAmountMember": {
     "auth_ref": [
      "r50",
      "r95",
      "r98",
      "r100",
      "r101",
      "r186",
      "r195",
      "r196",
      "r235",
      "r238"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for the amount at which an asset is recognised in the statement of financial position (after deducting any accumulated depreciation or amortisation and accumulated impairment losses). It also represents the standard value for the 'Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount' axis if no other member is used. [Refer: Depreciation and amortisation expense; Impairment loss]"
       }
      },
      "en-us": {
       "role": {
        "label": "Carrying amount [member]"
       }
      }
     },
     "localname": "CarryingAmountMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_Cash": {
     "auth_ref": [
      "r115"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 1.0,
       "parentTag": "ifrs-full_CurrentAssets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of cash on hand and demand deposits. [Refer: Cash on hand]"
       }
      },
      "en-us": {
       "role": {
        "label": "Cash",
        "periodEndLabel": "Cash, end of year",
        "periodStartLabel": "Cash, beginning of year",
        "terseLabel": "Cash"
       }
      }
     },
     "localname": "Cash",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate": {
     "auth_ref": [
      "r178"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 1.0,
       "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount recognised as of the acquisition date for cash and cash equivalents acquired in a business combination. [Refer: Cash and cash equivalents; Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Cash and cash equivalents recognised as of acquisition date",
        "terseLabel": "Cash"
       }
      }
     },
     "localname": "CashAndCashEquivalentsRecognisedAsOfAcquisitionDate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CashFlowsFromUsedInDecreaseIncreaseInRestrictedCashAndCashEquivalents": {
     "auth_ref": [
      "r105"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 2.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash inflow (outflow) due to a decrease (increase) in restricted cash and cash equivalents. [Refer: Restricted cash and cash equivalents]"
       }
      },
      "en-us": {
       "role": {
        "label": "Cash flows from (used in) decrease (increase) in restricted cash and cash equivalents",
        "terseLabel": "Decrease (increase) in restricted cash"
       }
      }
     },
     "localname": "CashFlowsFromUsedInDecreaseIncreaseInRestrictedCashAndCashEquivalents",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CashFlowsFromUsedInFinancingActivities": {
     "auth_ref": [
      "r103",
      "r117"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 2.0,
       "parentTag": "ifrs-full_IncreaseDecreaseInCashAndCashEquivalents",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash flows from (used in) financing activities, which are activities that result in changes in the size and composition of the contributed equity and borrowings of the entity."
       }
      },
      "en-us": {
       "role": {
        "label": "Cash flows from (used in) financing activities",
        "totalLabel": "Cash provided by (used in) financing activities"
       }
      }
     },
     "localname": "CashFlowsFromUsedInFinancingActivities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Cash flows from (used in) financing activities [abstract]",
        "terseLabel": "Financing activities:"
       }
      }
     },
     "localname": "CashFlowsFromUsedInFinancingActivitiesAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_CashFlowsFromUsedInInvestingActivities": {
     "auth_ref": [
      "r103",
      "r117"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 3.0,
       "parentTag": "ifrs-full_IncreaseDecreaseInCashAndCashEquivalents",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash flows from (used in) investing activities, which are the acquisition and disposal of long-term assets and other investments not included in cash equivalents."
       }
      },
      "en-us": {
       "role": {
        "label": "Cash flows from (used in) investing activities",
        "totalLabel": "Cash provided by (used in) investing activities"
       }
      }
     },
     "localname": "CashFlowsFromUsedInInvestingActivities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Cash flows from (used in) investing activities [abstract]",
        "terseLabel": "Investing activities:"
       }
      }
     },
     "localname": "CashFlowsFromUsedInInvestingActivitiesAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_CashFlowsFromUsedInOperatingActivities": {
     "auth_ref": [
      "r103",
      "r117"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 1.0,
       "parentTag": "ifrs-full_IncreaseDecreaseInCashAndCashEquivalents",
       "weight": 1.0
      }
     },
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities. [Refer: Revenue]"
       }
      },
      "en-us": {
       "role": {
        "label": "Cash flows from (used in) operating activities",
        "negatedLabel": "Cash flow from operating activities",
        "totalLabel": "Cash provided by (used in) operating activities"
       }
      }
     },
     "localname": "CashFlowsFromUsedInOperatingActivities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Cash flows from (used in) operating activities [abstract]",
        "terseLabel": "Operating activities:"
       }
      }
     },
     "localname": "CashFlowsFromUsedInOperatingActivitiesAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities": {
     "auth_ref": [
      "r114"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 1.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The aggregate cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities. [Refer: Subsidiaries [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities",
        "negatedLabel": "Acquisitions, net of cash acquired"
       }
      }
     },
     "localname": "CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CashOutflowForLeases": {
     "auth_ref": [
      "r149"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash outflow for leases."
       }
      },
      "en-us": {
       "role": {
        "label": "Cash outflow for leases",
        "negatedLabel": "Payments of lease liabilities"
       }
      }
     },
     "localname": "CashOutflowForLeases",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CashTransferred": {
     "auth_ref": [
      "r173"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 1.0,
       "parentTag": "ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Cash transferred",
        "terseLabel": "Cash",
        "verboseLabel": "Cash Paid"
       }
      }
     },
     "localname": "CashTransferred",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CategoriesOfRelatedPartiesAxis": {
     "auth_ref": [
      "r66"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Categories of related parties [axis]"
       }
      }
     },
     "localname": "CategoriesOfRelatedPartiesAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ClassesOfAssetsAxis": {
     "auth_ref": [
      "r78",
      "r81",
      "r139",
      "r152"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Classes of assets [axis]"
       }
      }
     },
     "localname": "ClassesOfAssetsAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ClassesOfAssetsMember": {
     "auth_ref": [
      "r78",
      "r139",
      "r152"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits. It also represents the standard value for the 'Classes of assets' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Assets [member]"
       }
      }
     },
     "localname": "ClassesOfAssetsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_ClassesOfFinancialAssetsAxis": {
     "auth_ref": [
      "r204",
      "r205",
      "r224",
      "r230",
      "r231",
      "r232"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Classes of financial assets [axis]"
       }
      }
     },
     "localname": "ClassesOfFinancialAssetsAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis": {
     "auth_ref": [
      "r96"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Classes of intangible assets other than goodwill [axis]"
       }
      }
     },
     "localname": "ClassesOfIntangibleAssetsOtherThanGoodwillAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis": {
     "auth_ref": [
      "r51"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Classes of property, plant and equipment [axis]"
       }
      }
     },
     "localname": "ClassesOfPropertyPlantAndEquipmentAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ClassesOfShareCapitalAxis": {
     "auth_ref": [
      "r27"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Classes of share capital [axis]"
       }
      }
     },
     "localname": "ClassesOfShareCapitalAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ClassesOfShareCapitalMember": {
     "auth_ref": [
      "r27"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for share capital of the entity. It also represents the standard value for the 'Classes of share capital' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Share capital [member]"
       }
      }
     },
     "localname": "ClassesOfShareCapitalMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_ComponentsOfEquityAxis": {
     "auth_ref": [
      "r7"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Components of equity [axis]"
       }
      }
     },
     "localname": "ComponentsOfEquityAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ComprehensiveIncome": {
     "auth_ref": [
      "r3",
      "r29",
      "r120",
      "r122",
      "r129",
      "r132"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of change in equity resulting from transactions and other events, other than those changes resulting from transactions with owners in their capacity as owners."
       }
      },
      "en-us": {
       "role": {
        "label": "Comprehensive income",
        "terseLabel": "Loss for the period and comprehensive loss"
       }
      }
     },
     "localname": "ComprehensiveIncome",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ComputerEquipmentMember": {
     "auth_ref": [
      "r44"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a class of property, plant and equipment representing computer equipment. [Refer: Property, plant and equipment]"
       }
      },
      "en-us": {
       "role": {
        "label": "Computer equipment"
       }
      }
     },
     "localname": "ComputerEquipmentMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate": {
     "auth_ref": [
      "r177"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 7.0,
       "parentTag": "ifrs-full_CurrentLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount, at acquisition date, of contingent consideration arrangements recognised as consideration transferred in a business combination. [Refer: Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Contingent consideration recognised as of acquisition date",
        "terseLabel": "Deferred and contingent consideration (note 13)",
        "verboseLabel": "Deferred and contingent consideration payable"
       }
      }
     },
     "localname": "ContingentConsiderationRecognisedAsOfAcquisitionDate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CostOfSales": {
     "auth_ref": [
      "r2",
      "r33"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 1.0,
       "parentTag": "ifrs-full_GrossProfit",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of all expenses directly or indirectly attributed to the goods or services sold. Attributed expenses include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, such as depreciation and maintenance of factory buildings and equipment used in the production process, unallocated production overheads, and abnormal amounts of production costs of inventories."
       }
      },
      "en-us": {
       "role": {
        "label": "Cost of sales",
        "totalLabel": "Cost of revenue"
       }
      }
     },
     "localname": "CostOfSales",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CurrentAssets": {
     "auth_ref": [
      "r20",
      "r129",
      "r130"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 5.0,
       "parentTag": "ifrs-full_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of assets that the entity (a) expects to realise or intends to sell or consume in its normal operating cycle; (b) holds primarily for the purpose of trading; (c) expects to realise within twelve months after the reporting period; or (d) classifies as cash or cash equivalents (as defined in IAS 7) unless the asset is restricted from being exchanged or used to settle a liability for at least twelve months after the reporting period. [Refer: Assets]"
       }
      },
      "en-us": {
       "role": {
        "label": "Current assets",
        "totalLabel": "Total current assets"
       }
      }
     },
     "localname": "CurrentAssets",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CurrentAssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Current assets [abstract]",
        "terseLabel": "Current assets:"
       }
      }
     },
     "localname": "CurrentAssetsAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_CurrentGovernmentGrants": {
     "auth_ref": [
      "r17"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureDeferredGrantIncomeDetails": {
       "order": 1.0,
       "parentTag": "ifrs-full_GovernmentGrants",
       "weight": 1.0
      },
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 3.0,
       "parentTag": "ifrs-full_CurrentLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of current government grants recognised in the statement of financial position as deferred income. [Refer: Government [member]; Government grants]"
       }
      },
      "en-us": {
       "role": {
        "label": "Current government grants",
        "terseLabel": "Less: current portion of deferred grant income",
        "verboseLabel": "Current portion of deferred grant income (note 11)"
       }
      }
     },
     "localname": "CurrentGovernmentGrants",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredGrantIncomeDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CurrentLeaseLiabilities": {
     "auth_ref": [
      "r146"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 5.0,
       "parentTag": "ifrs-full_CurrentLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of current lease liabilities. [Refer: Lease liabilities]"
       }
      },
      "en-us": {
       "role": {
        "label": "Current lease liabilities",
        "terseLabel": "Current portion of lease liabilities (note 8)",
        "verboseLabel": "Less current portion of lease liabilities"
       }
      }
     },
     "localname": "CurrentLeaseLiabilities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesLeaseLiabilitiesDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CurrentLiabilities": {
     "auth_ref": [
      "r21",
      "r129",
      "r131"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 4.0,
       "parentTag": "ifrs-full_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Expiry date 2023-01-01: The amount of liabilities that: (a) the entity expects to settle in its normal operating cycle; (b) the entity holds primarily for the purpose of trading; (c) are due to be settled within twelve months after the reporting period; or (d) the entity does not have an unconditional right to defer settlement for at least twelve months after the reporting period.\nEffective 2023-01-01: The amount of liabilities that: (a) the entity expects to settle in its normal operating cycle; (b) the entity holds primarily for the purpose of trading; (c) are due to be settled within twelve months after the reporting period; or (d) the entity does not have the right at the end of the reporting period to defer settlement for at least twelve months after the reporting period."
       }
      },
      "en-us": {
       "role": {
        "label": "Current liabilities",
        "totalLabel": "Total current liabilities"
       }
      }
     },
     "localname": "CurrentLiabilities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CurrentLiabilitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Current liabilities [abstract]",
        "terseLabel": "Current liabilities:"
       }
      }
     },
     "localname": "CurrentLiabilitiesAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_CurrentLiabilitiesRecognisedAsOfAcquisitionDate": {
     "auth_ref": [
      "r178"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 3.0,
       "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Expiry date 2022-01-01: The amount recognised as of the acquisition date for current liabilities assumed in a business combination. [Refer: Business combinations [member]]\nEffective 2022-01-01: The amount recognised as of the acquisition date for current liabilities assumed in a business combination. [Refer: Current liabilities; Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Current liabilities recognised as of acquisition date",
        "negatedLabel": "Current lease liabilities"
       }
      }
     },
     "localname": "CurrentLiabilitiesRecognisedAsOfAcquisitionDate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CurrentPortionOfLongtermBorrowings": {
     "auth_ref": [
      "r17"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails": {
       "order": 1.0,
       "parentTag": "ifrs-full_Borrowings",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The current portion of non-current borrowings. [Refer: Borrowings]"
       }
      },
      "en-us": {
       "role": {
        "label": "Current portion of non-current borrowings",
        "terseLabel": "Short Term"
       }
      }
     },
     "localname": "CurrentPortionOfLongtermBorrowings",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CurrentPrepaymentsAndOtherCurrentAssets": {
     "auth_ref": [
      "r17"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 4.0,
       "parentTag": "ifrs-full_CurrentAssets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of current prepayments and other current assets. [Refer: Other current assets; Current prepayments]"
       }
      },
      "en-us": {
       "role": {
        "label": "Current prepayments and other current assets",
        "terseLabel": "Prepaid expenses and other",
        "verboseLabel": "Prepaid expenses and other"
       }
      }
     },
     "localname": "CurrentPrepaymentsAndOtherCurrentAssets",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CurrentRestrictedCashAndCashEquivalents": {
     "auth_ref": [
      "r17"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of current restricted cash and cash equivalents. [Refer: Restricted cash and cash equivalents]"
       }
      },
      "en-us": {
       "role": {
        "label": "Current restricted cash and cash equivalents",
        "terseLabel": "Amount reclassed from cash to restricted cash"
       }
      }
     },
     "localname": "CurrentRestrictedCashAndCashEquivalents",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationAdditionalInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_CurrentSecuredBankLoansReceivedAndCurrentPortionOfNoncurrentSecuredBankLoansReceived": {
     "auth_ref": [
      "r9"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 4.0,
       "parentTag": "ifrs-full_CurrentLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of current secured bank loans received and the current portion of non-current secured bank loans received. [Refer: Secured bank loans received]"
       }
      },
      "en-us": {
       "role": {
        "label": "Current secured bank loans received and current portion of non-current secured bank loans received",
        "terseLabel": "Current portion of loans payable (note 10(a))"
       }
      }
     },
     "localname": "CurrentSecuredBankLoansReceivedAndCurrentPortionOfNoncurrentSecuredBankLoansReceived",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised": {
     "auth_ref": [
      "r38"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Deductible temporary differences for which no deferred tax asset is recognised",
        "terseLabel": "Unrecognized total deferred tax assets"
       }
      }
     },
     "localname": "DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_DeferredTaxLiabilityAsset": {
     "auth_ref": [
      "r39"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]"
       }
      },
      "en-us": {
       "role": {
        "label": "Deferred tax liability (asset)",
        "terseLabel": "Net deferred tax assets/(liabilities)"
       }
      }
     },
     "localname": "DeferredTaxLiabilityAsset",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesUnusedTaxAssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_DepreciationExpense": {
     "auth_ref": [
      "r9"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 1.0,
       "parentTag": "ifrs-full_CostOfSales",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives."
       }
      },
      "en-us": {
       "role": {
        "label": "Depreciation expense",
        "terseLabel": "Depreciation (notes 6 and 8)"
       }
      }
     },
     "localname": "DepreciationExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_DepreciationPropertyPlantAndEquipment": {
     "auth_ref": [
      "r49",
      "r52"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment]"
       }
      },
      "en-us": {
       "role": {
        "label": "Depreciation, property, plant and equipment",
        "terseLabel": "Depreciation"
       }
      }
     },
     "localname": "DepreciationPropertyPlantAndEquipment",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_DepreciationRightofuseAssets": {
     "auth_ref": [
      "r147"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]"
       }
      },
      "en-us": {
       "role": {
        "label": "Depreciation, right-of-use assets",
        "negatedLabel": "Depreciation on right-of-use assets"
       }
      }
     },
     "localname": "DepreciationRightofuseAssets",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForBusinessCombinationsExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for business combinations. [Refer: Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for business combinations [text block]",
        "terseLabel": "Business combinations"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForBusinessCombinationsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForContingentLiabilitiesAndContingentAssetsExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for contingent liabilities and contingent assets. [Refer: Contingent liabilities [member]; Description of nature of contingent assets]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for contingent liabilities and contingent assets [text block]",
        "terseLabel": "Contingencies"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForContingentLiabilitiesAndContingentAssetsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for earnings per share."
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for earnings per share [text block]",
        "terseLabel": "Earnings per share"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForEarningsPerShareExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for employee benefits. Employee benefits are all forms of consideration given by an entity in exchange for services rendered by employees or for the termination of employment."
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for employee benefits [text block]",
        "terseLabel": "Defined contribution pension plan"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for fair value measurement. [Refer: At fair value [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for fair value measurement [text block]",
        "terseLabel": "Fair value measurement"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForFinanceIncomeAndCostsExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for finance income and costs. [Refer: Finance income (cost)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for finance income and costs [text block]",
        "terseLabel": "Finance income and finance costs"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForFinanceIncomeAndCostsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for financial instruments. [Refer: Financial instruments, class [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for financial instruments [text block]",
        "terseLabel": "Financial instruments"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants": {
     "auth_ref": [
      "r59"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for government grants, including the methods of presentation adopted in the financial statements. [Refer: Government [member]; Government grants]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for government grants [text block]",
        "terseLabel": "Government grants"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForGovernmentGrants",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for the impairment of non-financial assets. [Refer: Financial assets]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for impairment of non-financial assets [text block]",
        "terseLabel": "Impairment of non-financial assets"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for income tax."
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for income tax [text block]",
        "terseLabel": "Income taxes"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForIncomeTaxExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for intangible assets other than goodwill [text block]",
        "verboseLabel": "Intangible assets"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for leases. A lease is an agreement whereby the lessor conveys to the lessee in return for a payment or series of payments the right to use an asset for an agreed period of time."
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for leases [text block]",
        "terseLabel": "Leases"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForLeasesExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for property, plant and equipment. [Refer: Property, plant and equipment]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for property, plant and equipment [text block]",
        "verboseLabel": "Property, plant and equipment"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for provisions. [Refer: Provisions]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for provisions [text block]",
        "terseLabel": "Provisions"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForProvisionsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for recognising revenue. [Refer: Revenue]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for recognition of revenue [text block]",
        "terseLabel": "Revenue recognition"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForRecognitionOfRevenue",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for segment reporting."
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for segment reporting [text block]",
        "terseLabel": "Operating segments"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForSegmentReportingExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for share-based payment transactions [text block]",
        "terseLabel": "Stock-based compensation"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy for trade and other receivables. [Refer: Trade and other receivables]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for trade and other receivables [text block]",
        "terseLabel": "Accounts receivable"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents": {
     "auth_ref": [
      "r116"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The description of the entity's accounting policy used to determine the components of cash and cash equivalents. [Refer: Cash and cash equivalents]"
       }
      },
      "en-us": {
       "role": {
        "label": "Description of accounting policy for determining components of cash and cash equivalents [text block]",
        "terseLabel": "Cash"
       }
      }
     },
     "localname": "DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections": {
     "auth_ref": [
      "r84",
      "r86"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Discount rate applied to cash flow projections",
        "terseLabel": "Weighted average cost of capital discount rate"
       }
      }
     },
     "localname": "DescriptionOfDiscountRatesAppliedToCashFlowProjections",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted": {
     "auth_ref": [
      "r168"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time."
       }
      },
      "en-us": {
       "role": {
        "label": "Expected volatility, share options granted",
        "terseLabel": "Volatility assumption"
       }
      }
     },
     "localname": "DescriptionOfExpectedVolatilityShareOptionsGranted",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfShareOptionAwardsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections": {
     "auth_ref": [
      "r83",
      "r85"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Growth rate used to extrapolate cash flow projections",
        "terseLabel": "Perpetuity growth rate"
       }
      }
     },
     "localname": "DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ifrs-full_DescriptionOfManagingLiquidityRisk": {
     "auth_ref": [
      "r201"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of how the entity manages its liquidity risk. [Refer: Liquidity risk [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of how entity manages liquidity risk [text block]",
        "terseLabel": "Capital management"
       }
      }
     },
     "localname": "DescriptionOfManagingLiquidityRisk",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCapitalManagement"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DescriptionOfOptionLifeShareOptionsGranted": {
     "auth_ref": [
      "r168"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The option life of share options granted."
       }
      },
      "en-us": {
       "role": {
        "label": "Option life, share options granted",
        "terseLabel": "Remaining life assumption"
       }
      }
     },
     "localname": "DescriptionOfOptionLifeShareOptionsGranted",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfShareOptionAwardsDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted": {
     "auth_ref": [
      "r168"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Risk free interest rate, share options granted",
        "terseLabel": "Annual risk-free interest rate assumption"
       }
      }
     },
     "localname": "DescriptionOfRiskFreeInterestRateShareOptionsGranted",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfShareOptionAwardsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ifrs-full_DilutedEarningsLossPerShare": {
     "auth_ref": [
      "r73",
      "r74"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Diluted earnings (loss) per share",
        "terseLabel": "Diluted",
        "verboseLabel": "Loss per share: Diluted"
       }
      }
     },
     "localname": "DilutedEarningsLossPerShare",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShareDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "perShareItemType"
    },
    "ifrs-full_DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory": {
     "auth_ref": [
      "r154"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of additional information about leasing activities of a lessee."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of additional information about leasing activities for lessee [text block]",
        "terseLabel": "Reconciliation of lease liabilities"
       }
      }
     },
     "localname": "DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of the basis used for the preparation of the financial statements."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of basis of preparation of financial statements [text block]",
        "terseLabel": "Basis of preparation"
       }
      }
     },
     "localname": "DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparation"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfBorrowingsExplanatory": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of borrowings. [Refer: Borrowings]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of borrowings [text block]",
        "verboseLabel": "Loans payable"
       }
      }
     },
     "localname": "DisclosureOfBorrowingsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayable"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfBusinessCombinationsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Business acquisitions"
       }
      }
     },
     "localname": "DisclosureOfBusinessCombinationsAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfBusinessCombinationsExplanatory": {
     "auth_ref": [
      "r189"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The entire disclosure for business combinations."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of business combinations [text block]",
        "terseLabel": "Business acquisitions"
       }
      }
     },
     "localname": "DisclosureOfBusinessCombinationsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitions"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfBusinessCombinationsLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about business combination [line items]",
        "terseLabel": "Business acquisitions:"
       }
      }
     },
     "localname": "DisclosureOfBusinessCombinationsLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsTables"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfBusinessCombinationsTable": {
     "auth_ref": [
      "r182"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to details of business combinations."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about business combination [table]"
       }
      }
     },
     "localname": "DisclosureOfBusinessCombinationsTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsTables"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfChangesInAccountingPoliciesAccountingEstimatesAndErrorsExplanatory": {
     "auth_ref": [
      "r118"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The entire disclosure for changes in accounting policies, accounting estimates and errors."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of changes in accounting policies, accounting estimates and errors [text block]",
        "terseLabel": "Recent accounting pronouncements"
       }
      }
     },
     "localname": "DisclosureOfChangesInAccountingPoliciesAccountingEstimatesAndErrorsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRecentAccountingPronouncements"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfClassesOfShareCapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Common shares."
       }
      }
     },
     "localname": "DisclosureOfClassesOfShareCapitalAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory": {
     "auth_ref": [
      "r27"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of classes of share capital. [Refer: Share capital [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of classes of share capital [text block]",
        "terseLabel": "Common shares"
       }
      }
     },
     "localname": "DisclosureOfClassesOfShareCapitalExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonShares"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfClassesOfShareCapitalLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of classes of share capital [line items]"
       }
      }
     },
     "localname": "DisclosureOfClassesOfShareCapitalLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfClassesOfShareCapitalTable": {
     "auth_ref": [
      "r27"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to classes of share capital."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of classes of share capital [table]"
       }
      }
     },
     "localname": "DisclosureOfClassesOfShareCapitalTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfBrokerWarrantsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfContingentLiabilitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Contingencies"
       }
      }
     },
     "localname": "DisclosureOfContingentLiabilitiesAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfContingentLiabilitiesExplanatory": {
     "auth_ref": [
      "r90"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of contingent liabilities. [Refer: Contingent liabilities [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of contingent liabilities [text block]",
        "terseLabel": "Contingencies"
       }
      }
     },
     "localname": "DisclosureOfContingentLiabilitiesExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContingencies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationExplanatory": {
     "auth_ref": [
      "r179"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of contingent liabilities in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of contingent liabilities in business combination [text block]",
        "terseLabel": "Summary of deferred and contingent consideration payable"
       }
      }
     },
     "localname": "DisclosureOfContingentLiabilitiesInBusinessCombinationExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of contingent liabilities in business combination [line items]"
       }
      }
     },
     "localname": "DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable": {
     "auth_ref": [
      "r179",
      "r183"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to contingent liabilities in business combinations."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of contingent liabilities in business combination [table]"
       }
      }
     },
     "localname": "DisclosureOfContingentLiabilitiesInBusinessCombinationTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfDepreciationAndAmortisationExpenseExplanatory": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of depreciation and amortisation expense. [Refer: Depreciation and amortisation expense]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of depreciation and amortisation expense [text block]",
        "terseLabel": "Schedule of estimated useful lives of property, plant and equipment"
       }
      }
     },
     "localname": "DisclosureOfDepreciationAndAmortisationExpenseExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory": {
     "auth_ref": [
      "r206"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of detailed information about borrowings. [Refer: Borrowings]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about borrowings [text block]",
        "terseLabel": "Schedule of borrowings"
       }
      }
     },
     "localname": "DisclosureOfDetailedInformationAboutBorrowingsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about borrowings [line items]",
        "terseLabel": "Basis of preparation"
       }
      }
     },
     "localname": "DisclosureOfDetailedInformationAboutBorrowingsLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableNonControllingInterestLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableTables",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable": {
     "auth_ref": [
      "r206"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to details of borrowings."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about borrowings [table]"
       }
      }
     },
     "localname": "DisclosureOfDetailedInformationAboutBorrowingsTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableNonControllingInterestLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableTables",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesLenderWarrantsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory": {
     "auth_ref": [
      "r190"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of detailed information about business combinations. [Refer: Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about business combination [text block]",
        "terseLabel": "Schedule of allocation of the purchase price consideration"
       }
      }
     },
     "localname": "DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory": {
     "auth_ref": [
      "r96"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of detailed information about intangible assets. [Refer: Intangible assets other than goodwill]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about intangible assets [text block]",
        "terseLabel": "Schedule of estimated useful lives of intangible assets"
       }
      }
     },
     "localname": "DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory": {
     "auth_ref": [
      "r51"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of detailed information about property, plant and equipment. [Refer: Property, plant and equipment]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about property, plant and equipment [text block]",
        "terseLabel": "Schedule of reconciliation of property, plant and equipment"
       }
      }
     },
     "localname": "DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfEarningsPerShareExplanatory": {
     "auth_ref": [
      "r77"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The entire disclosure for earnings per share."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of earnings per share [text block]",
        "terseLabel": "Basic and diluted loss per share"
       }
      }
     },
     "localname": "DisclosureOfEarningsPerShareExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShare"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfEmployeeBenefitsExplanatory": {
     "auth_ref": [
      "r58"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The entire disclosure for employee benefits."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of employee benefits [text block]",
        "terseLabel": "Pensions"
       }
      }
     },
     "localname": "DisclosureOfEmployeeBenefitsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePensions"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfExpensesByNatureExplanatory": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of expenses by nature. [Refer: Expenses, by nature]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of expenses by nature [text block]",
        "terseLabel": "Expenses by nature"
       }
      }
     },
     "localname": "DisclosureOfExpensesByNatureExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNature"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfFinancialAssetsLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of financial assets [line items]"
       }
      }
     },
     "localname": "DisclosureOfFinancialAssetsLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfFinancialAssetsTable": {
     "auth_ref": [
      "r206"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to financial assets."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of financial assets [table]"
       }
      }
     },
     "localname": "DisclosureOfFinancialAssetsTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedExplanatory": {
     "auth_ref": [
      "r236"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of financial assets that are either past due or impaired. [Refer: Financial assets]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of financial assets that are either past due or impaired [text block]",
        "terseLabel": "Schedule of accounts receivable balance aging analysis"
       }
      }
     },
     "localname": "DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of financial assets that are either past due or impaired [line items]"
       }
      }
     },
     "localname": "DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable": {
     "auth_ref": [
      "r236"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to financial assets that are either past due or impaired."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of financial assets that are either past due or impaired [table]"
       }
      }
     },
     "localname": "DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfFinancialInstrumentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Risk management arising from financial instruments"
       }
      }
     },
     "localname": "DisclosureOfFinancialInstrumentsAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfFinancialInstrumentsExplanatory": {
     "auth_ref": [
      "r216"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The entire disclosure for financial instruments."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of financial instruments [text block]",
        "terseLabel": "Risk management arising from financial instruments"
       }
      }
     },
     "localname": "DisclosureOfFinancialInstrumentsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstruments"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfGeneralAndAdministrativeExpenseExplanatory": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of general and administrative expenses. [Refer: Administrative expenses]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of general and administrative expense [text block]",
        "terseLabel": "Components of corporate, general and administrative costs"
       }
      }
     },
     "localname": "DisclosureOfGeneralAndAdministrativeExpenseExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfGovernmentGrantsExplanatory": {
     "auth_ref": [
      "r60"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The entire disclosure for government grants."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of government grants [text block]",
        "verboseLabel": "Deferred grant income"
       }
      }
     },
     "localname": "DisclosureOfGovernmentGrantsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredGrantIncome"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfIncomeTaxExplanatory": {
     "auth_ref": [
      "r41"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The entire disclosure for income taxes."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of income tax [text block]",
        "terseLabel": "Income taxes"
       }
      }
     },
     "localname": "DisclosureOfIncomeTaxExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxes"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of information about key management personnel. [Refer: Key management personnel of entity or parent [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of information about key management personnel [text block]"
       }
      }
     },
     "localname": "DisclosureOfInformationAboutKeyManagementPersonnelExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfIntangibleAssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Intangible assets."
       }
      }
     },
     "localname": "DisclosureOfIntangibleAssetsAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of intangible assets and goodwill. [Refer: Intangible assets and goodwill]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of intangible assets and goodwill [text block]",
        "terseLabel": "Intangible assets"
       }
      }
     },
     "localname": "DisclosureOfIntangibleAssetsAndGoodwillExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssets"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfIntangibleAssetsLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about intangible assets [line items]",
        "terseLabel": "Intangible assets:"
       }
      }
     },
     "localname": "DisclosureOfIntangibleAssetsLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfIntangibleAssetsTable": {
     "auth_ref": [
      "r96"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to details of intangible assets."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about intangible assets [table]"
       }
      }
     },
     "localname": "DisclosureOfIntangibleAssetsTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory": {
     "auth_ref": [
      "r127"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of interests in subsidiaries. [Refer: Subsidiaries [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of interests in subsidiaries [text block]",
        "terseLabel": "Non-controlling interest"
       }
      }
     },
     "localname": "DisclosureOfInterestsInSubsidiariesExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterest"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfLeasesExplanatory": {
     "auth_ref": [
      "r157",
      "r158"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The entire disclosure for leases."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of leases [text block]",
        "terseLabel": "Right-of-use assets and leases liabilities"
       }
      }
     },
     "localname": "DisclosureOfLeasesExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilities"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of maturity analysis for non-derivative financial liabilities [line items]",
        "terseLabel": "Undiscounted cash flows for bank loans",
        "verboseLabel": "Undiscounted cash flows for lease liabilities"
       }
      }
     },
     "localname": "DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable": {
     "auth_ref": [
      "r200"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to the maturity analysis for non-derivative financial liabilities."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of maturity analysis for non-derivative financial liabilities [table]"
       }
      }
     },
     "localname": "DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory": {
     "auth_ref": [
      "r156"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of a maturity analysis of operating lease payments. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of maturity analysis of operating lease payments [text block]",
        "terseLabel": "Undiscounted cash flows for lease liabilities"
       }
      }
     },
     "localname": "DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory": {
     "auth_ref": [
      "r165"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of the number and weighted average exercise prices of share options. [Refer: Weighted average [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of number and weighted average exercise prices of share options [text block]",
        "verboseLabel": "Reconciliation of share based compensation - options"
       }
      }
     },
     "localname": "DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfOtherLiabilitiesExplanatory": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of other liabilities. [Refer: Other liabilities]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of other liabilities [text block]",
        "terseLabel": "Other payables"
       }
      }
     },
     "localname": "DisclosureOfOtherLiabilitiesExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfPropertyPlantAndEquipmentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Property, plant and equipment."
       }
      }
     },
     "localname": "DisclosureOfPropertyPlantAndEquipmentAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory": {
     "auth_ref": [
      "r54"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The entire disclosure for property, plant and equipment."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of property, plant and equipment [text block]",
        "terseLabel": "Property, plant and equipment"
       }
      }
     },
     "localname": "DisclosureOfPropertyPlantAndEquipmentExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipment"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about property, plant and equipment [line items]",
        "terseLabel": "Property, plant and equipment:"
       }
      }
     },
     "localname": "DisclosureOfPropertyPlantAndEquipmentLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable": {
     "auth_ref": [
      "r51"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to details of property, plant and equipment."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of detailed information about property, plant and equipment [table]"
       }
      }
     },
     "localname": "DisclosureOfPropertyPlantAndEquipmentTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfQuantitativeInformationAboutLeasesForLesseeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Right-of-use assets and leases liabilities"
       }
      }
     },
     "localname": "DisclosureOfQuantitativeInformationAboutLeasesForLesseeAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory": {
     "auth_ref": [
      "r152"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of quantitative information about right-of-use assets. [Refer: Right-of-use assets]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of quantitative information about right-of-use assets [text block]",
        "terseLabel": "Reconciliation of right-of-use assets"
       }
      }
     },
     "localname": "DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of quantitative information about right-of-use assets [line items]",
        "verboseLabel": "Right-of-use assets"
       }
      }
     },
     "localname": "DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsTable": {
     "auth_ref": [
      "r152"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to right-of-use assets."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of quantitative information about right-of-use assets [table]"
       }
      }
     },
     "localname": "DisclosureOfQuantitativeInformationAboutRightofuseAssetsTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory": {
     "auth_ref": [
      "r96"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of the reconciliation of changes in intangible assets and goodwill. [Refer: Intangible assets and goodwill]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of reconciliation of changes in intangible assets and goodwill [text block]",
        "terseLabel": "Reconciliation of intangible assets and goodwill"
       }
      }
     },
     "localname": "DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAndGoodwillTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of reconciliation of changes in intangible assets and goodwill [line items]"
       }
      }
     },
     "localname": "DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable": {
     "auth_ref": [
      "r96"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to the reconciliation of changes in intangible assets and goodwill."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of reconciliation of changes in intangible assets and goodwill [table]"
       }
      }
     },
     "localname": "DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfRelatedPartyExplanatory": {
     "auth_ref": [
      "r68"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The entire disclosure for related parties."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of related party [text block]",
        "terseLabel": "Related party transactions"
       }
      }
     },
     "localname": "DisclosureOfRelatedPartyExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactions"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Non-controlling interest."
       }
      }
     },
     "localname": "DisclosureOfSignificantInvestmentsInSubsidiariesAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory": {
     "auth_ref": [
      "r70",
      "r72",
      "r135"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of subsidiaries. [Refer: Subsidiaries [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of subsidiaries [text block]",
        "terseLabel": "Subsidiaries included in consolidated financial results"
       }
      }
     },
     "localname": "DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of subsidiaries [line items]"
       }
      }
     },
     "localname": "DisclosureOfSignificantInvestmentsInSubsidiariesLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable": {
     "auth_ref": [
      "r70",
      "r72",
      "r135"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to subsidiaries."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of subsidiaries [table]"
       }
      }
     },
     "localname": "DisclosureOfSignificantInvestmentsInSubsidiariesTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory": {
     "auth_ref": [
      "r11"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The entire disclosure for significant accounting policies applied by the entity."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of significant accounting policies [text block]",
        "terseLabel": "Significant accounting policies"
       }
      }
     },
     "localname": "DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory": {
     "auth_ref": [
      "r40"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of types of temporary differences, unused tax losses and unused tax credits. [Refer: Unused tax credits [member]; Unused tax losses [member]; Temporary differences [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of temporary difference, unused tax losses and unused tax credits [text block]",
        "terseLabel": "Schedule of deferred tax asset and liability"
       }
      }
     },
     "localname": "DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of temporary difference, unused tax losses and unused tax credits [line items]",
        "terseLabel": "Temporary differences recognized in the Company's consolidated financial statements",
        "verboseLabel": "Deferred tax assets and liabilities"
       }
      }
     },
     "localname": "DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesPropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesUnusedTaxAssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable": {
     "auth_ref": [
      "r40"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to temporary differences, unused tax losses and unused tax credits."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of temporary difference, unused tax losses and unused tax credits [table]"
       }
      }
     },
     "localname": "DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesPropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesUnusedTaxAssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of terms and conditions of share-based payment arrangement [line items]"
       }
      }
     },
     "localname": "DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesTables"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable": {
     "auth_ref": [
      "r167"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to terms and conditions of share-based payment arrangements."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of terms and conditions of share-based payment arrangement [table]"
       }
      }
     },
     "localname": "DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesTables"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of trade and other payables. [Refer: Trade and other payables]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of trade and other payables [text block]",
        "terseLabel": "Accounts payable and accrued liabilities"
       }
      }
     },
     "localname": "DisclosureOfTradeAndOtherPayablesExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureAccountsPayableAndAccruedLiabilities"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Related party transactions"
       }
      }
     },
     "localname": "DisclosureOfTransactionsBetweenRelatedPartiesAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of transactions between related parties [line items]"
       }
      }
     },
     "localname": "DisclosureOfTransactionsBetweenRelatedPartiesLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable": {
     "auth_ref": [
      "r66"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to transactions between related parties."
       }
      },
      "en-us": {
       "role": {
        "label": "Disclosure of transactions between related parties [table]"
       }
      }
     },
     "localname": "DisclosureOfTransactionsBetweenRelatedPartiesTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_DisposalsPropertyPlantAndEquipment": {
     "auth_ref": [
      "r48"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment]"
       }
      },
      "en-us": {
       "role": {
        "label": "Disposals, property, plant and equipment",
        "negatedLabel": "Asset disposal"
       }
      }
     },
     "localname": "DisposalsPropertyPlantAndEquipment",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_DividendsPaidToNoncontrollingInterests": {
     "auth_ref": [
      "r128"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of dividends paid to non-controlling interests. [Refer: Non-controlling interests]"
       }
      },
      "en-us": {
       "role": {
        "label": "Dividends paid to non-controlling interests",
        "negatedLabel": "Distributions paid to non-controlling interest"
       }
      }
     },
     "localname": "DividendsPaidToNoncontrollingInterests",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities": {
     "auth_ref": [
      "r108"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 11.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash outflow for dividends paid to non-controlling interests, classified as financing activities. [Refer: Non-controlling interests; Dividends paid to non-controlling interests]"
       }
      },
      "en-us": {
       "role": {
        "label": "Dividends paid to non-controlling interests, classified as financing activities",
        "negatedLabel": "Distribution to non-controlling interest"
       }
      }
     },
     "localname": "DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests": {
     "auth_ref": [
      "r6"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of dividends recognised as distributions to non-controlling interests. [Refer: Non-controlling interests]"
       }
      },
      "en-us": {
       "role": {
        "label": "Dividends recognised as distributions to non-controlling interests",
        "negatedLabel": "Distributions to non-controlling interest"
       }
      }
     },
     "localname": "DividendsRecognisedAsDistributionsToNoncontrollingInterests",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_EarningsPerShareAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Basic and diluted loss per share",
        "terseLabel": "Net loss per share (note 22):"
       }
      }
     },
     "localname": "EarningsPerShareAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_EarningsPerShareExplanatory": {
     "auth_ref": [
      "r73"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The disclosure of earnings per share."
       }
      },
      "en-us": {
       "role": {
        "label": "Earnings per share [text block]",
        "terseLabel": "Earnings per share calculation"
       }
      }
     },
     "localname": "EarningsPerShareExplanatory",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShareTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_EntitysTotalForBusinessCombinationsMember": {
     "auth_ref": [
      "r182",
      "r187"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for the standard value for the 'Business combinations' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Entity's total for business combinations [member]"
       }
      }
     },
     "localname": "EntitysTotalForBusinessCombinationsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsTables",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureDeferredAndContingentConsiderationAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_EntitysTotalForCashgeneratingUnitsMember": {
     "auth_ref": [
      "r87",
      "r89"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for the standard value for the 'Cash-generating units' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Entity's total for cash-generating units [member]"
       }
      }
     },
     "localname": "EntitysTotalForCashgeneratingUnitsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_EntitysTotalForRelatedPartiesMember": {
     "auth_ref": [
      "r66"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for the standard value for the 'Categories of related parties' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Entity's total for related parties [member]"
       }
      }
     },
     "localname": "EntitysTotalForRelatedPartiesMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_EntitysTotalForSubsidiariesMember": {
     "auth_ref": [
      "r70",
      "r72",
      "r135"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for the standard value for the 'Subsidiaries' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Entity's total for subsidiaries [member]"
       }
      }
     },
     "localname": "EntitysTotalForSubsidiariesMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_Equity": {
     "auth_ref": [
      "r17",
      "r24",
      "r119",
      "r121",
      "r136",
      "r137",
      "r138"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 1.0,
       "parentTag": "ifrs-full_EquityAndLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of residual interest in the assets of the entity after deducting all its liabilities."
       }
      },
      "en-us": {
       "role": {
        "label": "Equity",
        "periodEndLabel": "Balance, end of period",
        "periodStartLabel": "Balance, beginning of period",
        "totalLabel": "Total shareholders' equity"
       }
      }
     },
     "localname": "Equity",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_EquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Equity [abstract]",
        "terseLabel": "Shareholders' equity:"
       }
      }
     },
     "localname": "EquityAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_EquityAndLiabilities": {
     "auth_ref": [
      "r17"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of the entity's equity and liabilities. [Refer: Equity; Liabilities]"
       }
      },
      "en-us": {
       "role": {
        "label": "Equity and liabilities",
        "totalLabel": "Total liabilities and shareholders' equity"
       }
      }
     },
     "localname": "EquityAndLiabilities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_EquityAndLiabilitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Equity and liabilities [abstract]",
        "terseLabel": "Liabilities and Shareholders' Equity"
       }
      }
     },
     "localname": "EquityAndLiabilitiesAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_EquityAttributableToOwnersOfParent": {
     "auth_ref": [
      "r16"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 2.0,
       "parentTag": "ifrs-full_Equity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of equity attributable to the owners of the parent. This specifically excludes non-controlling interest."
       }
      },
      "en-us": {
       "role": {
        "label": "Equity attributable to owners of parent",
        "totalLabel": "Total shareholder's equity excluding non-controlling interest"
       }
      }
     },
     "localname": "EquityAttributableToOwnersOfParent",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_EquityInterestsOfAcquirer": {
     "auth_ref": [
      "r175"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 4.0,
       "parentTag": "ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The fair value, at the acquisition date, of equity interests of the acquirer transferred as consideration in a business combination. [Refer: Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Equity interests of acquirer",
        "terseLabel": "Portion of purchase price paid in stock",
        "verboseLabel": "Share issuance"
       }
      }
     },
     "localname": "EquityInterestsOfAcquirer",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_EquityMember": {
     "auth_ref": [
      "r7"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for the residual interest in the assets of the entity after deducting all its liabilities. It also represents the standard value for the 'Components of equity' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Equity [member]"
       }
      }
     },
     "localname": "EquityMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted": {
     "auth_ref": [
      "r168"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The percentage of an expected dividend used to calculate the fair value of share options granted."
       }
      },
      "en-us": {
       "role": {
        "label": "Expected dividend as percentage, share options granted",
        "terseLabel": "Expected dividend yield assumption"
       }
      }
     },
     "localname": "ExpectedDividendAsPercentageShareOptionsGranted",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfShareOptionAwardsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ifrs-full_ExpenseByNature": {
     "auth_ref": [
      "r33"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expenses aggregated according to their nature (for example, depreciation, purchases of materials, transport costs, employee benefits and advertising costs), and not reallocated among functions within the entity."
       }
      },
      "en-us": {
       "role": {
        "label": "Expenses, by nature",
        "verboseLabel": "Total"
       }
      }
     },
     "localname": "ExpenseByNature",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ExpenseByNatureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Expenses by nature",
        "terseLabel": "Expenses:"
       }
      }
     },
     "localname": "ExpenseByNatureAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets": {
     "auth_ref": [
      "r9"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions]"
       }
      },
      "en-us": {
       "role": {
        "label": "Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets",
        "terseLabel": "Expenses recognized during the period"
       }
      }
     },
     "localname": "ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ExpenseFromEquitysettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets": {
     "auth_ref": [
      "r171"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions]"
       }
      },
      "en-us": {
       "role": {
        "label": "Expense from equity-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets",
        "terseLabel": "Share based compensation expense"
       }
      }
     },
     "localname": "ExpenseFromEquitysettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees": {
     "auth_ref": [
      "r9"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 6.0,
       "parentTag": "ifrs-full_ProfitLossBeforeTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]"
       }
      },
      "en-us": {
       "role": {
        "label": "Expense from share-based payment transactions with employees",
        "terseLabel": "Share-based compensation (note 15)"
       }
      }
     },
     "localname": "ExpenseFromSharebasedPaymentTransactionsWithEmployees",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ExplanationOfEffectOfSharebasedPaymentsOnFinancialPositions": {
     "auth_ref": [
      "r170"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The explanation that enables users of financial statements to understand the effect of share-based payment transactions on the entity's financial position."
       }
      },
      "en-us": {
       "role": {
        "label": "Explanation of effect of share-based payments on entity's financial position [text block]",
        "terseLabel": "Schedule of share units arrangement liability"
       }
      }
     },
     "localname": "ExplanationOfEffectOfSharebasedPaymentsOnFinancialPositions",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ifrs-full_FinancialAssets": {
     "auth_ref": [
      "r193",
      "r195",
      "r196",
      "r198",
      "r199"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity\u2019s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity\u2019s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity\u2019s own equity instruments. For this purpose the entity\u2019s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity\u2019s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]"
       }
      },
      "en-us": {
       "role": {
        "label": "Financial assets",
        "verboseLabel": "Total accounts receivable"
       }
      }
     },
     "localname": "FinancialAssets",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_FinancialAssetsMember": {
     "auth_ref": [
      "r204",
      "r205",
      "r224",
      "r230",
      "r231",
      "r232"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for aggregated classes of financial assets. It also represents the standard value for the 'Classes of financial assets' axis if no other member is used. [Refer: Financial assets]"
       }
      },
      "en-us": {
       "role": {
        "label": "Financial assets, class [member]"
       }
      }
     },
     "localname": "FinancialAssetsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_FixedInterestRateMember": {
     "auth_ref": [
      "r202"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a fixed interest rate. [Refer: Interest rate risk [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Fixed interest rate"
       }
      }
     },
     "localname": "FixedInterestRateMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_Goodwill": {
     "auth_ref": [
      "r13",
      "r82",
      "r88",
      "r186"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 2.0,
       "parentTag": "ifrs-full_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Goodwill",
        "periodEndLabel": "Goodwill at end of period",
        "periodStartLabel": "Goodwill at beginning of period",
        "terseLabel": "Goodwill (note 5, note 7 (b))"
       }
      }
     },
     "localname": "Goodwill",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_GoodwillRecognisedAsOfAcquisitionDate": {
     "auth_ref": [
      "r182",
      "r188"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount recognised as of the business combination's acquisition date for goodwill. [Refer: Goodwill; Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Goodwill recognised as of acquisition date",
        "terseLabel": "Goodwill"
       }
      }
     },
     "localname": "GoodwillRecognisedAsOfAcquisitionDate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_GovernmentGrants": {
     "auth_ref": [
      "r17"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureDeferredGrantIncomeDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of assistance by government in the form of transfers of resources to an entity in return for past or future compliance with certain conditions relating to the operating activities of the entity, recognised as deferred income. They exclude those forms of government assistance that cannot reasonably have a value placed upon them and transactions with government that cannot be distinguished from the normal trading transactions of the entity. [Refer: Deferred income other than contract liabilities; Government [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Government grants",
        "totalLabel": "Deferred grant income"
       }
      }
     },
     "localname": "GovernmentGrants",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredGrantIncomeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_GrossCarryingAmountMember": {
     "auth_ref": [
      "r46",
      "r92",
      "r99",
      "r102",
      "r186",
      "r196",
      "r198",
      "r199",
      "r235",
      "r240"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for the amount at which an asset is recognised before deducting any accumulated depreciation (amortisation) and accumulated impairment losses thereon. [Refer: Depreciation and amortisation expense; Impairment loss]"
       }
      },
      "en-us": {
       "role": {
        "label": "Cost"
       }
      }
     },
     "localname": "GrossCarryingAmountMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_GrossLeaseLiabilities": {
     "auth_ref": [
      "r153",
      "r209"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails": {
       "order": 2.0,
       "parentTag": "ifrs-full_LeaseLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities]"
       }
      },
      "en-us": {
       "role": {
        "label": "Gross lease liabilities",
        "terseLabel": "Total minimum lease payments"
       }
      }
     },
     "localname": "GrossLeaseLiabilities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_GrossProfit": {
     "auth_ref": [
      "r2"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 9.0,
       "parentTag": "ifrs-full_ProfitLossBeforeTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of revenue less cost of sales. [Refer: Cost of sales; Revenue]"
       }
      },
      "en-us": {
       "role": {
        "label": "Gross profit",
        "totalLabel": "Regional operating (loss) income"
       }
      }
     },
     "localname": "GrossProfit",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed": {
     "auth_ref": [
      "r178",
      "r188"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Identifiable assets acquired (liabilities assumed)",
        "totalLabel": "Net assets acquired"
       }
      }
     },
     "localname": "IdentifiableAssetsAcquiredLiabilitiesAssumed",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate": {
     "auth_ref": [
      "r178",
      "r188"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 4.0,
       "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount recognised as of the acquisition date for identifiable intangible assets acquired in a business combination. [Refer: Intangible assets other than goodwill; Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Identifiable intangible assets recognised as of acquisition date",
        "terseLabel": "Assets acquired"
       }
      }
     },
     "localname": "IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ImpairmentLoss": {
     "auth_ref": [
      "r80",
      "r81"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Impairment loss",
        "terseLabel": "Impairment charges on intangible assets"
       }
      }
     },
     "localname": "ImpairmentLoss",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill": {
     "auth_ref": [
      "r185"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]"
       }
      },
      "en-us": {
       "role": {
        "label": "Impairment loss recognised in profit or loss, goodwill",
        "terseLabel": "Impairment"
       }
      }
     },
     "localname": "ImpairmentLossRecognisedInProfitOrLossGoodwill",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAccumulatedAmortizationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ImpairmentLossRecognisedInProfitOrLossTradeReceivables": {
     "auth_ref": [
      "r9"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of impairment loss recognised in profit or loss for trade receivables. [Refer: Impairment loss recognised in profit or loss; Trade receivables]"
       }
      },
      "en-us": {
       "role": {
        "label": "Impairment loss recognised in profit or loss, trade receivables",
        "terseLabel": "Bad debt expense"
       }
      }
     },
     "localname": "ImpairmentLossRecognisedInProfitOrLossTradeReceivables",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesAdditionalInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IncreaseDecreaseInCashAndCashEquivalents": {
     "auth_ref": [
      "r115"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The increase (decrease) in cash and cash equivalents after the effect of exchange rate changes on cash and cash equivalents held in foreign currencies. [Refer: Cash and cash equivalents; Effect of exchange rate changes on cash and cash equivalents]"
       }
      },
      "en-us": {
       "role": {
        "label": "Increase (decrease) in cash and cash equivalents",
        "totalLabel": "Increase (decrease) in cash"
       }
      }
     },
     "localname": "IncreaseDecreaseInCashAndCashEquivalents",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption": {
     "auth_ref": [
      "r55"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption",
        "terseLabel": "Increase in interest expense due to reasonably possible increase in interest rate"
       }
      }
     },
     "localname": "IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary": {
     "auth_ref": [
      "r6"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The increase (decrease) in equity resulting from the acquisition of subsidiaries. [Refer: Subsidiaries [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Increase (decrease) through acquisition of subsidiary, equity",
        "terseLabel": "Issuance of common shares - acquisition (note 13, note 14)",
        "verboseLabel": "Acquisition purchase price consideration (in dollars)"
       }
      }
     },
     "localname": "IncreaseDecreaseThroughAcquisitionOfSubsidiary",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IncreaseDecreaseThroughChangeInEquityOfSubsidiaries": {
     "auth_ref": [
      "r6"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The increase (decrease) in the entity's equity resulting from the change in the equity of subsidiaries. [Refer: Subsidiaries [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Increase (decrease) through change in equity of subsidiaries, equity",
        "terseLabel": "Acquisition of subsidiary non-controlling interest (note 23)"
       }
      }
     },
     "localname": "IncreaseDecreaseThroughChangeInEquityOfSubsidiaries",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl": {
     "auth_ref": [
      "r5"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The increase (decrease) in equity through changes in ownership interests in subsidiaries that do not result in loss of control. [Refer: Subsidiaries [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity",
        "verboseLabel": "Non-controlling interest subsidiary investment (note 23)"
       }
      }
     },
     "localname": "IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IncreaseDecreaseThroughExerciseOfOptions": {
     "auth_ref": [
      "r6"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The increase (decrease) in equity resulting from the exercise of options."
       }
      },
      "en-us": {
       "role": {
        "label": "Increase (decrease) through exercise of options, equity",
        "terseLabel": "Exercise of stock options (note 14)",
        "verboseLabel": "Option exercise (in dollars)"
       }
      }
     },
     "localname": "IncreaseDecreaseThroughExerciseOfOptions",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity": {
     "auth_ref": [
      "r6"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The increase (decrease) in equity resulting from the exercise of warrants."
       }
      },
      "en-us": {
       "role": {
        "label": "Increase (decrease) through exercise of warrants, equity",
        "verboseLabel": "Redemption of warrants"
       }
      }
     },
     "localname": "IncreaseDecreaseThroughExerciseOfWarrantsEquity",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions": {
     "auth_ref": [
      "r5"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The increase (decrease) in equity resulting from share-based payment transactions. [Refer: Equity]"
       }
      },
      "en-us": {
       "role": {
        "label": "Increase (decrease) through share-based payment transactions, equity",
        "verboseLabel": "Share-based compensation (note 15)"
       }
      }
     },
     "localname": "IncreaseDecreaseThroughSharebasedPaymentTransactions",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis": {
     "auth_ref": [
      "r87"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Cash-generating units [axis]"
       }
      }
     },
     "localname": "IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_InsuranceExpense": {
     "auth_ref": [
      "r9"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expense arising from purchased insurance."
       }
      },
      "en-us": {
       "role": {
        "label": "Insurance expense",
        "terseLabel": "Insurance"
       }
      }
     },
     "localname": "InsuranceExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IntangibleAssetsOtherThanGoodwill": {
     "auth_ref": [
      "r13",
      "r95"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 3.0,
       "parentTag": "ifrs-full_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill]"
       }
      },
      "en-us": {
       "role": {
        "label": "Intangible assets other than goodwill",
        "periodEndLabel": "Balance, end of period",
        "periodStartLabel": "Balance, beginning of period",
        "terseLabel": "Intangible assets (note 7 (a))"
       }
      }
     },
     "localname": "IntangibleAssetsOtherThanGoodwill",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IntangibleAssetsOtherThanGoodwillMember": {
     "auth_ref": [
      "r79",
      "r96",
      "r152"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for intangible assets other than goodwill. It also represents the standard value for the 'Classes of intangible assets other than goodwill' axis if no other member is used. [Refer: Intangible assets other than goodwill]"
       }
      },
      "en-us": {
       "role": {
        "label": "Intangible assets other than goodwill [member]"
       }
      }
     },
     "localname": "IntangibleAssetsOtherThanGoodwillMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureIntangibleAssetsDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfIntangibleAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_InterestExpense": {
     "auth_ref": [
      "r134",
      "r218",
      "r223"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 4.0,
       "parentTag": "ifrs-full_ProfitLossBeforeTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expense arising from interest."
       }
      },
      "en-us": {
       "role": {
        "label": "Interest expense",
        "terseLabel": "Interest expense"
       }
      }
     },
     "localname": "InterestExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_InterestExpenseOnLeaseLiabilities": {
     "auth_ref": [
      "r148"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of interest expense on lease liabilities. [Refer: Lease liabilities]"
       }
      },
      "en-us": {
       "role": {
        "label": "Interest expense on lease liabilities",
        "terseLabel": "Interest expense on lease liabilities"
       }
      }
     },
     "localname": "InterestExpenseOnLeaseLiabilities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_InterestPaidClassifiedAsFinancingActivities": {
     "auth_ref": [
      "r113"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 5.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash outflow for interest paid, classified as financing activities."
       }
      },
      "en-us": {
       "role": {
        "label": "Interest paid, classified as financing activities",
        "negatedLabel": "Interest paid"
       }
      }
     },
     "localname": "InterestPaidClassifiedAsFinancingActivities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_InterestRateTypesMember": {
     "auth_ref": [
      "r202"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for all types of interest rates. It also represents the standard value for the 'Types of interest rates' axis if no other member is used. [Refer: Interest rate risk [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Interest rate types [member]"
       }
      }
     },
     "localname": "InterestRateTypesMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_InterestReceivedClassifiedAsInvestingActivities": {
     "auth_ref": [
      "r113"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 5.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash inflow from interest received, classified as investing activities."
       }
      },
      "en-us": {
       "role": {
        "label": "Interest received, classified as investing activities",
        "terseLabel": "Interest received"
       }
      }
     },
     "localname": "InterestReceivedClassifiedAsInvestingActivities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IssueOfEquity": {
     "auth_ref": [
      "r5"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The increase in equity through the issue of equity instruments."
       }
      },
      "en-us": {
       "role": {
        "label": "Issue of equity",
        "terseLabel": "Issuance of common shares - financing (note 14)",
        "verboseLabel": "Share issuances (in dollars)"
       }
      }
     },
     "localname": "IssueOfEquity",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IssuedCapital": {
     "auth_ref": [
      "r24"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 1.0,
       "parentTag": "ifrs-full_EquityAttributableToOwnersOfParent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The nominal value of capital issued."
       }
      },
      "en-us": {
       "role": {
        "label": "Issued capital",
        "terseLabel": "Common shares (note 14)"
       }
      }
     },
     "localname": "IssuedCapital",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_IssuedCapitalMember": {
     "auth_ref": [
      "r7"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a component of equity representing issued capital."
       }
      },
      "en-us": {
       "role": {
        "label": "Common shares"
       }
      }
     },
     "localname": "IssuedCapitalMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_KeyManagementPersonnelCompensation": {
     "auth_ref": [
      "r63"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Key management personnel compensation",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "KeyManagementPersonnelCompensation",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment": {
     "auth_ref": [
      "r62"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsDetails": {
       "order": 1.0,
       "parentTag": "ifrs-full_KeyManagementPersonnelCompensation",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Key management personnel compensation, share-based payment",
        "terseLabel": "Stock-based compensation"
       }
      }
     },
     "localname": "KeyManagementPersonnelCompensationSharebasedPayment",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits": {
     "auth_ref": [
      "r61"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsDetails": {
       "order": 3.0,
       "parentTag": "ifrs-full_KeyManagementPersonnelCompensation",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Key management personnel compensation, short-term employee benefits",
        "terseLabel": "Salaries and bonuses"
       }
      }
     },
     "localname": "KeyManagementPersonnelCompensationShorttermEmployeeBenefits",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_LaterThanFiveYearsMember": {
     "auth_ref": [
      "r155",
      "r156",
      "r208",
      "r213",
      "r215",
      "r229"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a time band of later than five years."
       }
      },
      "en-us": {
       "role": {
        "label": "Thereafter"
       }
      }
     },
     "localname": "LaterThanFiveYearsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember": {
     "auth_ref": [
      "r9",
      "r155",
      "r156",
      "r208",
      "r215",
      "r229"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a time band of later than four years and not later than five years."
       }
      },
      "en-us": {
       "role": {
        "label": "2026"
       }
      }
     },
     "localname": "LaterThanFourYearsAndNotLaterThanFiveYearsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_LaterThanOneMonthAndNotLaterThanThreeMonthsMember": {
     "auth_ref": [
      "r207",
      "r211",
      "r215"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a time band of later than one month and not later than three months."
       }
      },
      "en-us": {
       "role": {
        "label": "0 - 90"
       }
      }
     },
     "localname": "LaterThanOneMonthAndNotLaterThanThreeMonthsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember": {
     "auth_ref": [
      "r9",
      "r155",
      "r156",
      "r208",
      "r215",
      "r229"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a time band of later than one year and not later than two years."
       }
      },
      "en-us": {
       "role": {
        "label": "2023"
       }
      }
     },
     "localname": "LaterThanOneYearAndNotLaterThanTwoYearsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_LaterThanThreeMonthsAndNotLaterThanSixMonthsMember": {
     "auth_ref": [
      "r208",
      "r212",
      "r215",
      "r234",
      "r237"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a time band of later than three months and not later than six months."
       }
      },
      "en-us": {
       "role": {
        "label": "91 - 180"
       }
      }
     },
     "localname": "LaterThanThreeMonthsAndNotLaterThanSixMonthsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember": {
     "auth_ref": [
      "r9",
      "r155",
      "r156",
      "r208",
      "r215",
      "r229"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a time band of later than three years and not later than four years."
       }
      },
      "en-us": {
       "role": {
        "label": "2025"
       }
      }
     },
     "localname": "LaterThanThreeYearsAndNotLaterThanFourYearsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember": {
     "auth_ref": [
      "r9",
      "r155",
      "r156",
      "r208",
      "r215",
      "r229"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a time band of later than two years and not later than three years."
       }
      },
      "en-us": {
       "role": {
        "label": "2024"
       }
      }
     },
     "localname": "LaterThanTwoYearsAndNotLaterThanThreeYearsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_LeaseLiabilities": {
     "auth_ref": [
      "r146"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration."
       }
      },
      "en-us": {
       "role": {
        "label": "Lease liabilities",
        "periodEndLabel": "Lease liabilities, end of period",
        "periodStartLabel": "Lease liabilities, beginning of period",
        "terseLabel": "Lease liabilities",
        "totalLabel": "Present value of minimum lease payments"
       }
      }
     },
     "localname": "LeaseLiabilities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesLeaseLiabilitiesDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_LeaseholdImprovementsMember": {
     "auth_ref": [
      "r44"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a class of property, plant and equipment representing improvements to assets held under a lease agreement."
       }
      },
      "en-us": {
       "role": {
        "label": "Leasehold improvements"
       }
      }
     },
     "localname": "LeaseholdImprovementsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_Liabilities": {
     "auth_ref": [
      "r17",
      "r136",
      "r137",
      "r138",
      "r219",
      "r222"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 2.0,
       "parentTag": "ifrs-full_EquityAndLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of a present obligation of the entity to transfer an economic resource as a result of past events. Economic resource is a right that has the potential to produce economic benefits."
       }
      },
      "en-us": {
       "role": {
        "label": "Liabilities",
        "totalLabel": "Total liabilities"
       }
      }
     },
     "localname": "Liabilities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011": {
     "auth_ref": [
      "r172"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Liabilities from share-based payment transactions",
        "terseLabel": "Outstanding value"
       }
      }
     },
     "localname": "LiabilitiesFromSharebasedPaymentTransactions2011",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_LiabilitiesIncurred": {
     "auth_ref": [
      "r174"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 2.0,
       "parentTag": "ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The fair value, at acquisition date, of liabilities incurred (for example, a liability for contingent consideration) as consideration transferred in a business combination. [Refer: Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Liabilities incurred",
        "terseLabel": "Deferred and contingent consideration"
       }
      }
     },
     "localname": "LiabilitiesIncurred",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_LongtermBorrowings": {
     "auth_ref": [
      "r17"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails": {
       "order": 2.0,
       "parentTag": "ifrs-full_Borrowings",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The non-current portion of non-current borrowings. [Refer: Borrowings]"
       }
      },
      "en-us": {
       "role": {
        "label": "Non-current portion of non-current borrowings",
        "terseLabel": "Long Term"
       }
      }
     },
     "localname": "LongtermBorrowings",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableBankLoansDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_MachineryMember": {
     "auth_ref": [
      "r42"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a class of property, plant and equipment representing long-lived, depreciable machinery used in operations. [Refer: Property, plant and equipment]"
       }
      },
      "en-us": {
       "role": {
        "label": "TMS devices"
       }
      }
     },
     "localname": "MachineryMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_MaturityAxis": {
     "auth_ref": [
      "r19",
      "r56",
      "r145",
      "r155",
      "r156",
      "r192",
      "r203",
      "r208",
      "r225",
      "r226",
      "r228",
      "r229"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Maturity [axis]"
       }
      }
     },
     "localname": "MaturityAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate": {
     "auth_ref": [
      "r180"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of non-controlling interest in the acquiree recognised at the acquisition date for business combinations in which the acquirer holds less than 100 per cent of the equity interests in the acquiree at the acquisition date. [Refer: Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Non-controlling interest in acquiree recognised at acquisition date",
        "terseLabel": "Amount of noncontrolling interest acquired",
        "verboseLabel": "Historical subsidiary investment by non-controlling interest"
       }
      }
     },
     "localname": "NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_NoncontrollingInterests": {
     "auth_ref": [
      "r15",
      "r123",
      "r125"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 1.0,
       "parentTag": "ifrs-full_Equity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Non-controlling interests",
        "terseLabel": "Non-controlling interest (note 23)",
        "verboseLabel": "Subsidiary investment by non-controlling interest"
       }
      }
     },
     "localname": "NoncontrollingInterests",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_NoncontrollingInterestsMember": {
     "auth_ref": [
      "r7"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for equity in a subsidiary not attributable, directly or indirectly, to the parent."
       }
      },
      "en-us": {
       "role": {
        "label": "Non-controlling interest"
       }
      }
     },
     "localname": "NoncontrollingInterestsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_NoncurrentAssetsRecognisedAsOfAcquisitionDate": {
     "auth_ref": [
      "r178"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 5.0,
       "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Expiry date 2022-01-01: The amount recognised as of the acquisition date for non-current assets acquired in a business combination. [Refer: Business combinations [member]]\nEffective 2022-01-01: The amount recognised as of the acquisition date for non-current assets acquired in a business combination. [Refer: Non-current assets; Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Non-current assets recognised as of acquisition date",
        "terseLabel": "Capital and other assets"
       }
      }
     },
     "localname": "NoncurrentAssetsRecognisedAsOfAcquisitionDate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_NoncurrentGovernmentGrants": {
     "auth_ref": [
      "r17"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureDeferredGrantIncomeDetails": {
       "order": 2.0,
       "parentTag": "ifrs-full_GovernmentGrants",
       "weight": 1.0
      },
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 3.0,
       "parentTag": "ifrs-full_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of non-current government grants recognised on the statement of financial position as deferred income. [Refer: Government [member]; Government grants]"
       }
      },
      "en-us": {
       "role": {
        "label": "Non-current government grants",
        "terseLabel": "Long-term portion of deferred grant income",
        "verboseLabel": "Deferred grant income (note 11)"
       }
      }
     },
     "localname": "NoncurrentGovernmentGrants",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureDeferredGrantIncomeDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_NoncurrentLeaseLiabilities": {
     "auth_ref": [
      "r146"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 1.0,
       "parentTag": "ifrs-full_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of non-current lease liabilities. [Refer: Lease liabilities]"
       }
      },
      "en-us": {
       "role": {
        "label": "Non-current lease liabilities",
        "terseLabel": "Lease liabilities (note 8)",
        "verboseLabel": "Long term portion of lease liabilities"
       }
      }
     },
     "localname": "NoncurrentLeaseLiabilities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesLeaseLiabilitiesDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate": {
     "auth_ref": [
      "r178"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 6.0,
       "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "Expiry date 2022-01-01: The amount recognised as of the acquisition date for non-current liabilities assumed in a business combination. [Refer: Business combinations [member]]\nEffective 2022-01-01: The amount recognised as of the acquisition date for non-current liabilities assumed in a business combination. [Refer: Non-current liabilities; Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Non-current liabilities recognised as of acquisition date",
        "negatedLabel": "Long-term lease liabilities"
       }
      }
     },
     "localname": "NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_NoncurrentPortionOfNoncurrentSecuredBankLoansReceived": {
     "auth_ref": [
      "r9"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 2.0,
       "parentTag": "ifrs-full_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The non-current portion of non-current secured bank loans received. [Refer: Secured bank loans received]"
       }
      },
      "en-us": {
       "role": {
        "label": "Non-current portion of non-current secured bank loans received",
        "terseLabel": "Loans payable (note 10(a))"
       }
      }
     },
     "localname": "NoncurrentPortionOfNoncurrentSecuredBankLoansReceived",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_NotLaterThanOneYearMember": {
     "auth_ref": [
      "r18",
      "r155",
      "r156",
      "r208",
      "r215",
      "r229"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a time band of not later than one year."
       }
      },
      "en-us": {
       "role": {
        "label": "2022"
       }
      }
     },
     "localname": "NotLaterThanOneYearMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableUndiscountedCashFlowsForBankLoansDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesUndiscountedCashFlowsForLeaseLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_NotionalAmount": {
     "auth_ref": [
      "r9"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The nominal or face amount of a financial instrument, used to calculate payments made on that instrument."
       }
      },
      "en-us": {
       "role": {
        "label": "Notional amount",
        "terseLabel": "Amount of loan"
       }
      }
     },
     "localname": "NotionalAmount",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable": {
     "auth_ref": [
      "r175"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The number of instruments or interests issued or issuable at acquisition date for equity interests of the acquirer transferred as consideration in a business combination."
       }
      },
      "en-us": {
       "role": {
        "label": "Number of instruments or interests issued or issuable",
        "verboseLabel": "Shares issued for the acquisition"
       }
      }
     },
     "localname": "NumberOfInstrumentsOrInterestsIssuedOrIssuable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted": {
     "auth_ref": [
      "r167",
      "r169"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement."
       }
      },
      "en-us": {
       "role": {
        "label": "Number of other equity instruments granted in share-based payment arrangement",
        "terseLabel": "Number of share units granted"
       }
      }
     },
     "localname": "NumberOfInstrumentsOtherEquityInstrumentsGranted",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "ifrs-full_NumberOfOutstandingShareOptions": {
     "auth_ref": [
      "r159",
      "r163",
      "r166"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The number of share options outstanding in a share-based payment arrangement."
       }
      },
      "en-us": {
       "role": {
        "label": "Number of share options outstanding in share-based payment arrangement",
        "periodEndLabel": "Outstanding, end of year",
        "periodStartLabel": "Outstanding, beginning of year"
       }
      }
     },
     "localname": "NumberOfOutstandingShareOptions",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement": {
     "auth_ref": [
      "r164"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The number of share options exercisable in a share-based payment arrangement."
       }
      },
      "en-us": {
       "role": {
        "label": "Number of share options exercisable in share-based payment arrangement",
        "terseLabel": "Number of options exercisable"
       }
      }
     },
     "localname": "NumberOfShareOptionsExercisableInSharebasedPaymentArrangement",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement": {
     "auth_ref": [
      "r162"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The number of share options exercised in a share-based payment arrangement."
       }
      },
      "en-us": {
       "role": {
        "label": "Number of share options exercised in share-based payment arrangement",
        "negatedLabel": "Exercised"
       }
      }
     },
     "localname": "NumberOfShareOptionsExercisedInSharebasedPaymentArrangement",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement": {
     "auth_ref": [
      "r161"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The number of share options forfeited in a share-based payment arrangement."
       }
      },
      "en-us": {
       "role": {
        "label": "NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement",
        "negatedLabel": "Forfeited"
       }
      }
     },
     "localname": "NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement": {
     "auth_ref": [
      "r160"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The number of share options granted in a share-based payment arrangement."
       }
      },
      "en-us": {
       "role": {
        "label": "Number of share options granted in share-based payment arrangement",
        "terseLabel": "Granted"
       }
      }
     },
     "localname": "NumberOfShareOptionsGrantedInSharebasedPaymentArrangement",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "ifrs-full_NumberOfSharesIssued": {
     "auth_ref": [
      "r6"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The number of shares issued by the entity."
       }
      },
      "en-us": {
       "role": {
        "label": "Number of shares issued",
        "terseLabel": "Shares issued"
       }
      }
     },
     "localname": "NumberOfSharesIssued",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesNarrativeDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "ifrs-full_NumberOfSharesOutstanding": {
     "auth_ref": [
      "r26"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]"
       }
      },
      "en-us": {
       "role": {
        "label": "Number of shares outstanding",
        "periodEndLabel": "Balance, end of period (shares)",
        "periodStartLabel": "Balance, beginning of period (shares)",
        "terseLabel": "Shares outstanding"
       }
      }
     },
     "localname": "NumberOfSharesOutstanding",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "sharesItemType"
    },
    "ifrs-full_OfficeEquipmentMember": {
     "auth_ref": [
      "r43"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a class of property, plant and equipment representing equipment used to support office functions, not specifically used in the production process. [Refer: Property, plant and equipment]"
       }
      },
      "en-us": {
       "role": {
        "label": "Furniture and equipment"
       }
      }
     },
     "localname": "OfficeEquipmentMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_OrdinarySharesMember": {
     "auth_ref": [
      "r27",
      "r73"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for equity instruments that are subordinate to all other classes of equity instruments. It also represents the standard value for the 'Classes of ordinary shares' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Common Shares"
       }
      }
     },
     "localname": "OrdinarySharesMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceAcquisitionDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_OtherExpenseByNature": {
     "auth_ref": [
      "r1",
      "r33"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]"
       }
      },
      "en-us": {
       "role": {
        "label": "Other expenses, by nature",
        "verboseLabel": "Other"
       }
      }
     },
     "localname": "OtherExpenseByNature",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_OtherTemporaryDifferencesMember": {
     "auth_ref": [
      "r40"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for temporary differences that the entity does not separately disclose in the same statement or note. [Refer: Temporary differences [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Other, including stock-based compensation"
       }
      }
     },
     "localname": "OtherTemporaryDifferencesMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_OutstandingBalancesForRelatedPartyTransactionsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Outstanding balances for related party transactions [abstract]",
        "terseLabel": "Transactions with significant shareholder - Greybrook Health Inc"
       }
      }
     },
     "localname": "OutstandingBalancesForRelatedPartyTransactionsAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_PastDueStatusAxis": {
     "auth_ref": [
      "r199",
      "r236"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Past due status [axis]"
       }
      }
     },
     "localname": "PastDueStatusAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_PastDueStatusMember": {
     "auth_ref": [
      "r199",
      "r236"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for all past-due statuses. It also represents the standard value for the 'Past due status' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Past due status [member]"
       }
      }
     },
     "localname": "PastDueStatusMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_PaymentsForDebtIssueCosts": {
     "auth_ref": [
      "r108"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 3.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash outflow for debt issue costs."
       }
      },
      "en-us": {
       "role": {
        "label": "Payments for debt issue costs",
        "negatedLabel": "Finance costs incurred (note 10(a))"
       }
      }
     },
     "localname": "PaymentsForDebtIssueCosts",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities": {
     "auth_ref": [
      "r107"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 8.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities]"
       }
      },
      "en-us": {
       "role": {
        "label": "Payments of lease liabilities, classified as financing activities",
        "negatedLabel": "Principal repayment of lease liabilities"
       }
      }
     },
     "localname": "PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_PercentageOfReasonablyPossibleIncreaseInActuarialAssumption": {
     "auth_ref": [
      "r55"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Percentage of reasonably possible increase in actuarial assumption",
        "terseLabel": "Reasonably possible increase in interest rate (as a percent)"
       }
      }
     },
     "localname": "PercentageOfReasonablyPossibleIncreaseInActuarialAssumption",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ifrs-full_PostemploymentBenefitExpenseDefinedContributionPlans": {
     "auth_ref": [
      "r57"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods."
       }
      },
      "en-us": {
       "role": {
        "label": "Post-employment benefit expense, defined contribution plans",
        "terseLabel": "Defined contribution plan expense"
       }
      }
     },
     "localname": "PostemploymentBenefitExpenseDefinedContributionPlans",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePensionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_PreferenceSharesMember": {
     "auth_ref": [
      "r27"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for equity instruments that are senior in some aspects to ordinary shares, but subordinate to debt instruments in terms of claim. [Refer: Ordinary shares [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Preferred Shares"
       }
      }
     },
     "localname": "PreferenceSharesMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_ProceedsFromExerciseOfOptions": {
     "auth_ref": [
      "r108"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 4.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash inflow from the exercise of options."
       }
      },
      "en-us": {
       "role": {
        "label": "Proceeds from exercise of options",
        "terseLabel": "Net proceeds on exercise of stock options"
       }
      }
     },
     "localname": "ProceedsFromExerciseOfOptions",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ProceedsFromExerciseOfWarrants": {
     "auth_ref": [
      "r108"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 10.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash inflow from the exercise of share purchase warrants."
       }
      },
      "en-us": {
       "role": {
        "label": "Proceeds from exercise of warrants",
        "terseLabel": "Broker warrants exercised"
       }
      }
     },
     "localname": "ProceedsFromExerciseOfWarrants",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ProceedsFromIssuingOtherEquityInstruments": {
     "auth_ref": [
      "r106"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 2.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash inflow from issuing equity instruments that the entity does not separately disclose in the same statement or note."
       }
      },
      "en-us": {
       "role": {
        "label": "Proceeds from issuing other equity instruments",
        "terseLabel": "Net proceeds on issuance of special warrants"
       }
      }
     },
     "localname": "ProceedsFromIssuingOtherEquityInstruments",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ProceedsFromIssuingShares": {
     "auth_ref": [
      "r106"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 1.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash inflow from issuing shares."
       }
      },
      "en-us": {
       "role": {
        "label": "Proceeds from issuing shares",
        "terseLabel": "Net proceeds on issuance of common shares (note 14)",
        "verboseLabel": "Aggregate gross proceeds"
       }
      }
     },
     "localname": "ProceedsFromIssuingShares",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasisOfPreparationGoingConcernDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ProfessionalFeesExpense": {
     "auth_ref": [
      "r9"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of fees paid or payable for professional services."
       }
      },
      "en-us": {
       "role": {
        "label": "Professional fees expense",
        "terseLabel": "Professional and legal fees"
       }
      }
     },
     "localname": "ProfessionalFeesExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ProfitLoss": {
     "auth_ref": [
      "r4",
      "r28",
      "r109",
      "r120",
      "r122",
      "r129",
      "r219",
      "r220",
      "r227",
      "r233"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 1.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLossCalc2": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income]"
       }
      },
      "en-us": {
       "role": {
        "label": "Profit (loss)",
        "terseLabel": "Loss for the year",
        "totalLabel": "Loss for the year and comprehensive loss"
       }
      }
     },
     "localname": "ProfitLoss",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ProfitLossAttributableToAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Profit (loss), attributable to [abstract]",
        "terseLabel": "(Loss) income for the year attributable to:"
       }
      }
     },
     "localname": "ProfitLossAttributableToAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ProfitLossAttributableToNoncontrollingInterests": {
     "auth_ref": [
      "r30",
      "r124"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLossCalc2": {
       "order": 1.0,
       "parentTag": "ifrs-full_ProfitLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The profit (loss) from continuing and discontinued operations attributable to non-controlling interests. [Refer: Profit (loss); Non-controlling interests]"
       }
      },
      "en-us": {
       "role": {
        "label": "Profit (loss), attributable to non-controlling interests",
        "netLabel": "Net (loss) income attributable to non-controlling interest",
        "terseLabel": "Non-controlling interest (note 23)",
        "verboseLabel": "Accounting Net Loss before income tax - non-controlling interest"
       }
      }
     },
     "localname": "ProfitLossAttributableToNoncontrollingInterests",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails",
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity": {
     "auth_ref": [
      "r75"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Profit (loss), attributable to ordinary equity holders of parent entity",
        "terseLabel": "Net loss attributable to the shareholders of: Greenbrook TMS"
       }
      }
     },
     "localname": "ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShareDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ProfitLossAttributableToOwnersOfParent": {
     "auth_ref": [
      "r31"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLossCalc2": {
       "order": 2.0,
       "parentTag": "ifrs-full_ProfitLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Profit (loss), attributable to owners of parent",
        "terseLabel": "Common shareholders of Greenbrook TMS",
        "verboseLabel": "Net (loss) income attributable to the shareholders of Greenbrook TMS"
       }
      }
     },
     "localname": "ProfitLossAttributableToOwnersOfParent",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ProfitLossBeforeTax": {
     "auth_ref": [
      "r1",
      "r2",
      "r191",
      "r219",
      "r220"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 1.0,
       "parentTag": "ifrs-full_ProfitLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The profit (loss) before tax expense or income. [Refer: Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Profit (loss) before tax",
        "totalLabel": "Loss before income taxes"
       }
      }
     },
     "localname": "ProfitLossBeforeTax",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ProfitLossOfAcquiree": {
     "auth_ref": [
      "r181"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The profit (loss) of the acquiree, since the acquisition date, included in the consolidated statement of comprehensive income. [Refer: Profit (loss)]"
       }
      },
      "en-us": {
       "role": {
        "label": "Profit (loss) of acquiree since acquisition date",
        "terseLabel": "Profit contributed since acquisition date",
        "verboseLabel": "Unaudited annual consolidated loss"
       }
      }
     },
     "localname": "ProfitLossOfAcquiree",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_PropertyPlantAndEquipment": {
     "auth_ref": [
      "r12",
      "r50"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 4.0,
       "parentTag": "ifrs-full_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period."
       }
      },
      "en-us": {
       "role": {
        "label": "Property, plant and equipment..",
        "negatedPeriodEndLabel": "Balance, end of period",
        "negatedPeriodStartLabel": "Balance, beginning of period",
        "periodEndLabel": "Balance, end of period",
        "periodStartLabel": "Balance, beginning of period",
        "terseLabel": "Property, plant and equipment (note 6)",
        "verboseLabel": "Property, plant and equipment"
       }
      }
     },
     "localname": "PropertyPlantAndEquipment",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_PropertyPlantAndEquipmentMember": {
     "auth_ref": [
      "r51",
      "r79",
      "r152"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for property, plant and equipment. It also represents the standard value for the 'Classes of property, plant and equipment' axis if no other member is used. [Refer: Property, plant and equipment]"
       }
      },
      "en-us": {
       "role": {
        "label": "Property, plant and equipment [member]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentAccumulatedDepreciationDetails",
      "http://www.greenbrooktms.com/role/DisclosurePropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate": {
     "auth_ref": [
      "r178",
      "r188"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails": {
       "order": 9.0,
       "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount recognised as of the acquisition date for plant, property and equipment acquired in a business combination. [Refer: Property, plant and equipment; Business combinations [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Property, plant and equipment recognised as of acquisition date",
        "terseLabel": "Property, plant and equipment"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ProportionOfOwnershipInterestInSubsidiary": {
     "auth_ref": [
      "r69",
      "r71",
      "r126"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Proportion of ownership interest in subsidiary",
        "terseLabel": "Ownership interest"
       }
      }
     },
     "localname": "ProportionOfOwnershipInterestInSubsidiary",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities": {
     "auth_ref": [
      "r104"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows": {
       "order": 4.0,
       "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The cash outflow for the purchases of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment]"
       }
      },
      "en-us": {
       "role": {
        "label": "Purchase of property, plant and equipment, classified as investing activities",
        "negatedLabel": "Purchase of property, plant and equipment"
       }
      }
     },
     "localname": "PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_RangeAxis": {
     "auth_ref": [
      "r140",
      "r141",
      "r142",
      "r166",
      "r206",
      "r228"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Range [axis]"
       }
      }
     },
     "localname": "RangeAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_RangesMember": {
     "auth_ref": [
      "r140",
      "r141",
      "r142",
      "r166",
      "r206",
      "r228"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for aggregate ranges. It also represents the standard value for the 'Range' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Ranges [member]"
       }
      }
     },
     "localname": "RangesMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Reconciliation of accounting profit multiplied by applicable tax rates [abstract]",
        "verboseLabel": "Reconciliation of income taxes"
       }
      }
     },
     "localname": "ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ReconciliationOfNumberOfSharesOutstandingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Number of Shares"
       }
      }
     },
     "localname": "ReconciliationOfNumberOfSharesOutstandingAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesReconciliationOfSharesOutstandingDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_RelatedPartyTransactionsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Related party transactions [abstract]"
       }
      }
     },
     "localname": "RelatedPartyTransactionsAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_ResearchAndDevelopmentExpense": {
     "auth_ref": [
      "r97"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 8.0,
       "parentTag": "ifrs-full_ProfitLossBeforeTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expenditure directly attributable to research or development activities, recognised in profit or loss."
       }
      },
      "en-us": {
       "role": {
        "label": "Research and development expense",
        "terseLabel": "Center development costs"
       }
      }
     },
     "localname": "ResearchAndDevelopmentExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_RestrictedCashAndCashEquivalents": {
     "auth_ref": [
      "r17"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 2.0,
       "parentTag": "ifrs-full_CurrentAssets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]"
       }
      },
      "en-us": {
       "role": {
        "label": "Restricted cash and cash equivalents",
        "terseLabel": "Restricted cash (note 5)"
       }
      }
     },
     "localname": "RestrictedCashAndCashEquivalents",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_RetainedEarnings": {
     "auth_ref": [
      "r24",
      "r34"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 3.0,
       "parentTag": "ifrs-full_EquityAttributableToOwnersOfParent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "A component of equity representing the entity's cumulative undistributed earnings or deficit."
       }
      },
      "en-us": {
       "role": {
        "label": "Retained earnings",
        "terseLabel": "Deficit"
       }
      }
     },
     "localname": "RetainedEarnings",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_RetainedEarningsMember": {
     "auth_ref": [
      "r7",
      "r8"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for a component of equity representing an entity's cumulative undistributed earnings or deficit."
       }
      },
      "en-us": {
       "role": {
        "label": "Deficit"
       }
      }
     },
     "localname": "RetainedEarningsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_RevenueAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Revenue [abstract]",
        "terseLabel": "Revenue:"
       }
      }
     },
     "localname": "RevenueAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_RevenueFromContractsWithCustomers": {
     "auth_ref": [
      "r143",
      "r144"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 2.0,
       "parentTag": "ifrs-full_GrossProfit",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity\u2019s ordinary activities in exchange for consideration."
       }
      },
      "en-us": {
       "role": {
        "label": "Revenue from contracts with customers",
        "terseLabel": "Service revenue",
        "verboseLabel": "Revenue"
       }
      }
     },
     "localname": "RevenueFromContractsWithCustomers",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_RevenueFromInterest": {
     "auth_ref": [
      "r9",
      "r133",
      "r217",
      "r223"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 1.0,
       "parentTag": "ifrs-full_ProfitLossBeforeTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of income arising from interest."
       }
      },
      "en-us": {
       "role": {
        "label": "Interest income",
        "negatedLabel": "Interest income"
       }
      }
     },
     "localname": "RevenueFromInterest",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_RevenueOfAcquiree": {
     "auth_ref": [
      "r181"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of revenue of the acquiree since the acquisition date included in the consolidated statement of comprehensive income. [Refer: Revenue]"
       }
      },
      "en-us": {
       "role": {
        "label": "Revenue of acquiree since acquisition date",
        "terseLabel": "Revenues contributed since acquisition date",
        "verboseLabel": "Unaudited annual consolidated revenue"
       }
      }
     },
     "localname": "RevenueOfAcquiree",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_RightofuseAssets": {
     "auth_ref": [
      "r151"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 1.0,
       "parentTag": "ifrs-full_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee."
       }
      },
      "en-us": {
       "role": {
        "label": "Right-of-use assets",
        "periodEndLabel": "Right-of-use assets, end of period",
        "periodStartLabel": "Right-of-use assets, beginning of period",
        "terseLabel": "Right-of-use assets (note 8)"
       }
      }
     },
     "localname": "RightofuseAssets",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/DisclosureRightOfUseAssetsAndLeasesLiabilitiesRightOfUseAssetsDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_SalesAndMarketingExpense": {
     "auth_ref": [
      "r32"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expense relating to the marketing and selling of goods or services."
       }
      },
      "en-us": {
       "role": {
        "label": "Sales and marketing expense",
        "terseLabel": "Marketing expenses"
       }
      }
     },
     "localname": "SalesAndMarketingExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_SellingGeneralAndAdministrativeExpense": {
     "auth_ref": [
      "r32"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss": {
       "order": 7.0,
       "parentTag": "ifrs-full_ProfitLossBeforeTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expense relating to selling, general and administrative activities of the entity."
       }
      },
      "en-us": {
       "role": {
        "label": "Selling, general and administrative expense",
        "terseLabel": "Corporate, general and administrative expenses (note 24)"
       }
      }
     },
     "localname": "SellingGeneralAndAdministrativeExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfNetLossAndComprehensiveLoss"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ShareIssueRelatedCost": {
     "auth_ref": [
      "r6"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of cost related to the issuance of shares."
       }
      },
      "en-us": {
       "role": {
        "label": "Share issue related cost",
        "terseLabel": "Incurred transaction costs",
        "verboseLabel": "Transaction costs"
       }
      }
     },
     "localname": "ShareIssueRelatedCost",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBusinessAcquisitionsAllocationOfPurchasePriceDetails",
      "http://www.greenbrooktms.com/role/DisclosureCommonSharesShareIssuanceOfferingsDetails",
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_SharePremium": {
     "auth_ref": [
      "r24"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 2.0,
       "parentTag": "ifrs-full_EquityAttributableToOwnersOfParent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount received or receivable from the issuance of the entity's shares in excess of nominal value."
       }
      },
      "en-us": {
       "role": {
        "label": "Share premium",
        "terseLabel": "Contributed surplus (note 15)"
       }
      }
     },
     "localname": "SharePremium",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_SharePremiumMember": {
     "auth_ref": [
      "r7"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for the amount received or receivable from issuance of the entity's shares in excess of nominal value."
       }
      },
      "en-us": {
       "role": {
        "label": "Contributed surplus"
       }
      }
     },
     "localname": "SharePremiumMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_SharebasedPaymentArrangementsMember": {
     "auth_ref": [
      "r167"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for an agreement between the entity or another group entity or any shareholder of the group entity and another party (including an employee) that entitles the other party to receive (a) cash or other assets of the entity for amounts that are based on the price (or value) of equity instruments (including shares or share options) of the entity or another group entity; or (b) equity instruments (including shares or share options) of the entity or another group entity, provided that the specified vesting conditions, if any, are met. It also represents the standard value for the 'Types of share-based payment arrangements' axis if no other member is used."
       }
      },
      "en-us": {
       "role": {
        "label": "Share-based payment arrangements [member]"
       }
      }
     },
     "localname": "SharebasedPaymentArrangementsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesTables"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_ShorttermBorrowings": {
     "auth_ref": [
      "r17"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of current borrowings. [Refer: Borrowings]"
       }
      },
      "en-us": {
       "role": {
        "label": "Current borrowings",
        "terseLabel": "Current borrowings"
       }
      }
     },
     "localname": "ShorttermBorrowings",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableNonControllingInterestLoansDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_ShorttermEmployeeBenefitsExpense": {
     "auth_ref": [
      "r9"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expense from employee benefits (other than termination benefits) that are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services."
       }
      },
      "en-us": {
       "role": {
        "label": "Short-term employee benefits expense",
        "terseLabel": "Salaries and bonuses"
       }
      }
     },
     "localname": "ShorttermEmployeeBenefitsExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_SignificantInvestmentsInSubsidiariesAxis": {
     "auth_ref": [
      "r70",
      "r72",
      "r135"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Subsidiaries [axis]"
       }
      }
     },
     "localname": "SignificantInvestmentsInSubsidiariesAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestOwnershipInterestDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_StatementOfCashFlowsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Consolidated Statements of Cash Flows"
       }
      }
     },
     "localname": "StatementOfCashFlowsAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_StatementOfChangesInEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Consolidated Statements of Changes in Equity"
       }
      }
     },
     "localname": "StatementOfChangesInEquityAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_StatementOfChangesInEquityLineItems": {
     "auth_ref": [],
     "lang": {
      "en": {
       "role": {
        "documentation": "Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Statement of changes in equity [line items]"
       }
      }
     },
     "localname": "StatementOfChangesInEquityLineItems",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_StatementOfChangesInEquityTable": {
     "auth_ref": [
      "r7"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "Schedule disclosing information related to changes in equity."
       }
      },
      "en-us": {
       "role": {
        "label": "Statement of changes in equity [table]"
       }
      }
     },
     "localname": "StatementOfChangesInEquityTable",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfChangesInEquity"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_StatementOfComprehensiveIncomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Consolidated Statements of Net Loss and Comprehensive Loss"
       }
      }
     },
     "localname": "StatementOfComprehensiveIncomeAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_StatementOfFinancialPositionAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Consolidated Statements of Financial Position"
       }
      }
     },
     "localname": "StatementOfFinancialPositionAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_SubsidiariesMember": {
     "auth_ref": [
      "r65",
      "r70",
      "r72",
      "r135"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for entities that are controlled by another entity."
       }
      },
      "en-us": {
       "role": {
        "label": "Subsidiaries"
       }
      }
     },
     "localname": "SubsidiariesMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_TaxBenefitArisingFromPreviouslyUnrecognisedTaxLossTaxCreditOrTemporaryDifferenceOfPriorPeriodUsedToReduceCurrentTaxExpense": {
     "auth_ref": [
      "r35"
     ],
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce current tax expense. [Refer: Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Tax benefit arising from previously unrecognised tax loss, tax credit or temporary difference of prior period used to reduce current tax expense",
        "terseLabel": "Change in unrecognized deferred tax assets"
       }
      }
     },
     "localname": "TaxBenefitArisingFromPreviouslyUnrecognisedTaxLossTaxCreditOrTemporaryDifferenceOfPriorPeriodUsedToReduceCurrentTaxExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_TaxEffectFromChangeInTaxRate": {
     "auth_ref": [
      "r36"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit]"
       }
      },
      "en-us": {
       "role": {
        "label": "Tax effect from change in tax rate",
        "terseLabel": "Future rate differential"
       }
      }
     },
     "localname": "TaxEffectFromChangeInTaxRate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_TaxExpenseIncomeAtApplicableTaxRate": {
     "auth_ref": [
      "r36"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The product of the accounting profit multiplied by the applicable tax rate(s). [Refer: Accounting profit; Applicable tax rate]"
       }
      },
      "en-us": {
       "role": {
        "label": "Tax expense (income) at applicable tax rate",
        "verboseLabel": "Income tax provision at statutory rate 25.38% (December 31, 2020 - 25.75%; December 31, 2019 - 25.95%)"
       }
      }
     },
     "localname": "TaxExpenseIncomeAtApplicableTaxRate",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis": {
     "auth_ref": [
      "r40"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Temporary difference, unused tax losses and unused tax credits [axis]"
       }
      }
     },
     "localname": "TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesPropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesUnusedTaxAssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember": {
     "auth_ref": [
      "r40"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for temporary differences, unused tax losses and unused tax credits. It also represents the standard value for the 'Temporary difference, unused tax losses and unused tax credits' axis if no other member is used. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Temporary difference, unused tax losses and unused tax credits [member]"
       }
      }
     },
     "localname": "TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesPropertyPlantAndEquipmentDetails",
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesUnusedTaxAssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_TopOfRangeMember": {
     "auth_ref": [
      "r140",
      "r141",
      "r142",
      "r166",
      "r206",
      "r228"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for top of a range."
       }
      },
      "en-us": {
       "role": {
        "label": "Maximum"
       }
      }
     },
     "localname": "TopOfRangeMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_TradeAndOtherCurrentPayables": {
     "auth_ref": [
      "r14"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 1.0,
       "parentTag": "ifrs-full_CurrentLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of current trade payables and current other payables. [Refer: Current trade payables; Other current payables]"
       }
      },
      "en-us": {
       "role": {
        "label": "Trade and other current payables",
        "terseLabel": "Accounts payable and accrued liabilities (note 9)",
        "totalLabel": "Total",
        "verboseLabel": "Account payable and accrued liabilities"
       }
      }
     },
     "localname": "TradeAndOtherCurrentPayables",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesDetails",
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers": {
     "auth_ref": [
      "r22",
      "r25"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesDetails": {
       "order": 1.0,
       "parentTag": "ifrs-full_TradeAndOtherCurrentPayables",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The current amount of payment due to suppliers for goods and services used in entity's business. [Refer: Current liabilities; Trade payables]"
       }
      },
      "en-us": {
       "role": {
        "label": "Current trade payables",
        "terseLabel": "Accounts payable"
       }
      }
     },
     "localname": "TradeAndOtherCurrentPayablesToTradeSuppliers",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_TradeAndOtherPayablesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Accounts payable and accrued liabilities"
       }
      }
     },
     "localname": "TradeAndOtherPayablesAbstract",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "xbrltype": "stringItemType"
    },
    "ifrs-full_TradeReceivables": {
     "auth_ref": [
      "r23"
     ],
     "calculation": {
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition": {
       "order": 3.0,
       "parentTag": "ifrs-full_CurrentAssets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount due from customers for goods and services sold."
       }
      },
      "en-us": {
       "role": {
        "label": "Trade receivables",
        "terseLabel": "Accounts receivable, net (note 19(b))",
        "verboseLabel": "Accounts receivable, net"
       }
      }
     },
     "localname": "TradeReceivables",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureNonControllingInterestConsolidatedAmountsDetails",
      "http://www.greenbrooktms.com/role/StatementConsolidatedStatementsOfFinancialPosition"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_TradeReceivablesMember": {
     "auth_ref": [
      "r9",
      "r194",
      "r197",
      "r199"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for trade receivables. [Refer: Trade receivables]"
       }
      },
      "en-us": {
       "role": {
        "label": "Accounts receivable"
       }
      }
     },
     "localname": "TradeReceivablesMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsScheduleOfAgingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_TravelExpense": {
     "auth_ref": [
      "r9"
     ],
     "crdr": "debit",
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of expense arising from travel."
       }
      },
      "en-us": {
       "role": {
        "label": "Travel expense",
        "terseLabel": "Travel, meals and entertainment"
       }
      }
     },
     "localname": "TravelExpense",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureExpensesByNatureDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_TypesOfInterestRatesAxis": {
     "auth_ref": [
      "r202"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Types of interest rates [axis]"
       }
      }
     },
     "localname": "TypesOfInterestRatesAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails",
      "http://www.greenbrooktms.com/role/DisclosureRiskManagementArisingFromFinancialInstrumentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_TypesOfSharebasedPaymentArrangementsAxis": {
     "auth_ref": [
      "r167"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table."
       }
      },
      "en-us": {
       "role": {
        "label": "Types of share-based payment arrangements [axis]"
       }
      }
     },
     "localname": "TypesOfSharebasedPaymentArrangementsAxis",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusOptionsNarrativeDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesDsuSPsuSDetails",
      "http://www.greenbrooktms.com/role/DisclosureOtherPayablesTables"
     ],
     "xbrltype": "stringItemType"
    },
    "ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised": {
     "auth_ref": [
      "r38"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Unused tax losses for which no deferred tax asset recognised",
        "terseLabel": "Operating tax loss carry-forwards"
       }
      }
     },
     "localname": "UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesReconciliationOfTaxExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ifrs-full_UnusedTaxLossesMember": {
     "auth_ref": [
      "r40"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "This member stands for tax losses that have been incurred and are carried forward for use against future taxable profit."
       }
      },
      "en-us": {
       "role": {
        "label": "Non-capital loss carry-forward"
       }
      }
     },
     "localname": "UnusedTaxLossesMember",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill": {
     "auth_ref": [
      "r91"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The useful life, measured as period of time, used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]"
       }
      },
      "en-us": {
       "role": {
        "label": "Useful life measured as period of time, intangible assets other than goodwill",
        "terseLabel": "Useful life of intangible assets"
       }
      }
     },
     "localname": "UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfIntangibleAssetsDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment": {
     "auth_ref": [
      "r45"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment]"
       }
      },
      "en-us": {
       "role": {
        "label": "Useful life measured as period of time, property, plant and equipment",
        "terseLabel": "Useful life"
       }
      }
     },
     "localname": "UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesOfPropertyPlantAndEquipmentDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019": {
     "auth_ref": [
      "r162"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The weighted average exercise price of share options exercised in a share-based payment arrangement. [Refer: Weighted average [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Weighted average exercise price of share options exercised in share-based payment arrangement",
        "negatedLabel": "Exercised (price per share)"
       }
      }
     },
     "localname": "WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019": {
     "auth_ref": [
      "r161"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The weighted average exercise price of share options forfeited in a share-based payment arrangement. [Refer: Weighted average [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "[WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019]",
        "negatedLabel": "Forfeited (price per share)"
       }
      }
     },
     "localname": "WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019": {
     "auth_ref": [
      "r160"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Weighted average exercise price of share options granted in share-based payment arrangement",
        "terseLabel": "Granted (price per share)"
       }
      }
     },
     "localname": "WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019": {
     "auth_ref": [
      "r159",
      "r163"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The weighted average exercise price of share options outstanding in a share-based payment arrangement. [Refer: Weighted average [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Weighted average exercise price of share options outstanding in share-based payment arrangement",
        "periodEndLabel": "Outstanding, end of year (price per share)",
        "periodStartLabel": "Outstanding, beginning of year (price per share)"
       }
      }
     },
     "localname": "WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019": {
     "auth_ref": [
      "r166"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Weighted average remaining contractual life of outstanding share options",
        "verboseLabel": "Weighted average contractual life"
       }
      }
     },
     "localname": "WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusReconciliationOfShareOptionsDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "ifrs-full_WeightedAverageSharePriceShareOptionsGranted2019": {
     "auth_ref": [
      "r168"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]"
       }
      },
      "en-us": {
       "role": {
        "label": "Weighted average share price, share options granted",
        "terseLabel": "Fair value of stock options granted, per share"
       }
      }
     },
     "localname": "WeightedAverageSharePriceShareOptionsGranted2019",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureContributedSurplusFairValueOfShareOptionAwardsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "ifrs-full_WeightedAverageShares": {
     "auth_ref": [
      "r76"
     ],
     "lang": {
      "en": {
       "role": {
        "documentation": "The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor."
       }
      },
      "en-us": {
       "role": {
        "label": "Weighted average number of ordinary shares outstanding",
        "terseLabel": "Weighted average common shares outstanding: Basic and diluted"
       }
      }
     },
     "localname": "WeightedAverageShares",
     "nsuri": "http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureBasicAndDilutedLossPerShareDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "srt_ArithmeticAverageMember": {
     "auth_ref": [],
     "lang": {
      "en-us": {
       "role": {
        "label": "Average"
       }
      }
     },
     "localname": "ArithmeticAverageMember",
     "nsuri": "http://fasb.org/srt/2021-01-31",
     "presentation": [
      "http://www.greenbrooktms.com/role/DisclosureLoansPayableDeviceLoansPppLoansAndNewCreditFacilityDetails"
     ],
     "xbrltype": "domainItemType"
    }
   },
   "unitCount": 11
  }
 },
 "std_ref": {
  "r0": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "10",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_10_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r1": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "102",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_102&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r10": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "117",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_117_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r100": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "40",
   "Paragraph": "79",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2021-en-r&anchor=para_79_d&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r101": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "41",
   "Paragraph": "50",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=41&code=ifrs-tx-2021-en-r&anchor=para_50&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r102": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "41",
   "Paragraph": "54",
   "Subparagraph": "f",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=41&code=ifrs-tx-2021-en-r&anchor=para_54_f&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r103": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "10",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_10&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r104": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "16",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_16_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r105": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "16",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_16&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r106": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "17",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r107": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "17",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r108": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "17",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r109": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "18",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_18_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r11": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "117",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_117&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r110": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "20",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r111": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "20",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r112": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "20",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r113": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "31",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_31&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r114": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "39",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_39&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r115": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "45",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r116": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "46",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_46&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r117": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "7",
   "Paragraph": "50",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_50_d&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r118": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "8",
   "Section": "Accounting policies",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=8&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IAS08_g7-31_TI",
   "URIDate": "2021-03-24"
  },
  "r119": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "1",
   "Paragraph": "24",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2021-en-r&anchor=para_24_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r12": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "54",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r120": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "1",
   "Paragraph": "24",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2021-en-r&anchor=para_24_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r121": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "1",
   "Paragraph": "32",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2021-en-r&anchor=para_32_a_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r122": {
   "Clause": "ii",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "1",
   "Paragraph": "32",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2021-en-r&anchor=para_32_a_ii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r123": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "10",
   "Paragraph": "22",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=10&code=ifrs-tx-2021-en-r&anchor=para_22&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r124": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "12",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_12_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r125": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "12",
   "Subparagraph": "f",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_12_f&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r126": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "19B",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_19B_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r127": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "2",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_2_b_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r128": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "B10",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B10_a&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r129": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "B10",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r13": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "54",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r130": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "B12",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B12_b_i&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r131": {
   "Clause": "iii",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "B12",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B12_b_iii&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r132": {
   "Clause": "ix",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "B12",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B12_b_ix&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r133": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "B13",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B13_e&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r134": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "B13",
   "Subparagraph": "f",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B13_f&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r135": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "12",
   "Paragraph": "B4",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B4_a&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r136": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "13",
   "Paragraph": "93",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r137": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "13",
   "Paragraph": "93",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r138": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "13",
   "Paragraph": "93",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r139": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "13",
   "Paragraph": "93",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r14": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "54",
   "Subparagraph": "k",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_k&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r140": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "13",
   "Paragraph": "B6",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_B6&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r141": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "13",
   "Paragraph": "IE63",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_IE63&doctype=Illustrative%20Examples",
   "URIDate": "2021-03-24"
  },
  "r142": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "14",
   "Paragraph": "33",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=14&code=ifrs-tx-2021-en-r&anchor=para_33_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r143": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "15",
   "Paragraph": "113",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_113_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r144": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "15",
   "Paragraph": "114",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_114&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r145": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "15",
   "Paragraph": "120",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_120_b_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r146": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Paragraph": "47",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r147": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Paragraph": "53",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r148": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Paragraph": "53",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r149": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Paragraph": "53",
   "Subparagraph": "g",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_g&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r15": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "54",
   "Subparagraph": "q",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_q&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r150": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Paragraph": "53",
   "Subparagraph": "h",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_h&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r151": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Paragraph": "53",
   "Subparagraph": "j",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_j&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r152": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Paragraph": "53",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r153": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Paragraph": "58",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_58&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r154": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Paragraph": "59",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_59&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r155": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Paragraph": "94",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_94&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r156": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Paragraph": "97",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_97&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r157": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Section": "Disclosure",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IFRS16_g51-60_TI",
   "URIDate": "2021-03-24"
  },
  "r158": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "16",
   "Section": "Presentation",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IFRS16_g47-50_TI",
   "URIDate": "2021-03-24"
  },
  "r159": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "45",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r16": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "54",
   "Subparagraph": "r",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_r&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r160": {
   "Clause": "ii",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "45",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_ii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r161": {
   "Clause": "iii",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "45",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_iii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r162": {
   "Clause": "iv",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "45",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_iv&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r163": {
   "Clause": "vi",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "45",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vi&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r164": {
   "Clause": "vii",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "45",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r165": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "45",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r166": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "45",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_d&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r167": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "45",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r168": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "47",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r169": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "47",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r17": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "55",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r170": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "50",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_50&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r171": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "51",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_51_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r172": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "2",
   "Paragraph": "51",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_51_b_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r173": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B64",
   "Subparagraph": "f",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_f_i&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r174": {
   "Clause": "iii",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B64",
   "Subparagraph": "f",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_f_iii&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r175": {
   "Clause": "iv",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B64",
   "Subparagraph": "f",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_f_iv&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r176": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B64",
   "Subparagraph": "f",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_f&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r177": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B64",
   "Subparagraph": "g",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_g_i&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r178": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B64",
   "Subparagraph": "i",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r179": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B64",
   "Subparagraph": "j",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_j&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r18": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "61",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_61_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r180": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B64",
   "Subparagraph": "o",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_o_i&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r181": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B64",
   "Subparagraph": "q",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_q_i&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r182": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B64",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r183": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B67",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r184": {
   "Clause": "ii",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B67",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B67_d_ii&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r185": {
   "Clause": "v",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B67",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r186": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B67",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r187": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "B67",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B67&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r188": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Paragraph": "IE72",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_IE72&doctype=Illustrative%20Examples",
   "URIDate": "2021-03-24"
  },
  "r189": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Section": "Disclosures",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IFRS03_g59-63__IFRS03_g59-63_TI",
   "URIDate": "2021-03-24"
  },
  "r19": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "61",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_61&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r190": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "3",
   "Section": "Disclosures application of paragraphs 59 and 61",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&doctype=Appendix&subtype=B&dita_xref=IFRS03_gB64-B67_TI",
   "URIDate": "2021-03-24"
  },
  "r191": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "5",
   "Paragraph": "33",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2021-en-r&anchor=para_33_b_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r192": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "23B",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_23B_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r193": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "25",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r194": {
   "Clause": "iii",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "35H",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H_b_iii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r195": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "35H",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r196": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "35I",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r197": {
   "Clause": "iii",
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "35M",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M_b_iii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r198": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "35M",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r199": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "35N",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r2": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "103",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_103&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r20": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "66",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_66&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r200": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "39",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_39_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r201": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "39",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_39_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r202": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "39",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_39&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r203": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "42E",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_42E_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r204": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "42I",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_42I&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r205": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "6",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_6&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r206": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "7",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_7&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r207": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "B11",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_B11_b&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r208": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "B11",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_B11&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r209": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "B11D",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_B11D_a&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r21": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "69",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_69&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r210": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "B11D",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_B11D&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r211": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "B35",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_B35_b&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r212": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "B35",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_B35_c&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r213": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "B35",
   "Subparagraph": "g",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_B35_g&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r214": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "B35",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_B35&doctype=Appendix&subtype=B",
   "URIDate": "2021-03-24"
  },
  "r215": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Paragraph": "IG31A",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_IG31A&doctype=Implementation%20Guidance",
   "URIDate": "2021-03-24"
  },
  "r216": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "7",
   "Section": "Scope",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IFRS07_g3-5A_TI",
   "URIDate": "2021-03-24"
  },
  "r217": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "8",
   "Paragraph": "23",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_23_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r218": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "8",
   "Paragraph": "23",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_23_d&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r219": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "8",
   "Paragraph": "23",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_23&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r22": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "70",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_70&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r220": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "8",
   "Paragraph": "28",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_28_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r221": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "8",
   "Paragraph": "28",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_28_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r222": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "8",
   "Paragraph": "28",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_28_d&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r223": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "8",
   "Paragraph": "28",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_28_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r224": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Number": "9",
   "Paragraph": "7.2.34",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2021-en-r&anchor=para_7.2.34&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r225": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Effective 2023-01-01",
   "Number": "17",
   "Paragraph": "109",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2021-en-r&anchor=para_109&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r226": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Effective 2023-01-01",
   "Number": "17",
   "Paragraph": "109A",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2021-en-r&anchor=para_109A&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r227": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Effective 2023-01-01",
   "Number": "17",
   "Paragraph": "113",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2021-en-r&anchor=para_113_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r228": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Effective 2023-01-01",
   "Number": "17",
   "Paragraph": "120",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2021-en-r&anchor=para_120&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r229": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Effective 2023-01-01",
   "Number": "17",
   "Paragraph": "132",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2021-en-r&anchor=para_132_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r23": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "78",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r230": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Effective 2023-01-01",
   "Number": "17",
   "Paragraph": "C32",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2021-en-r&anchor=para_C32&doctype=Appendix&subtype=C",
   "URIDate": "2021-03-24"
  },
  "r231": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Effective 2023-01-01",
   "Number": "9",
   "Paragraph": "7.2.42",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2021-en-r&anchor=para_7.2.42&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r232": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Effective on first application of IFRS 9",
   "Number": "4",
   "Paragraph": "39L",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2021-en-b&anchor=para_39L_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r233": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Effective on first application of IFRS 9",
   "Number": "4",
   "Paragraph": "39L",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2021-en-b&anchor=para_39L_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r234": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Expiry date 2023-01-01",
   "Number": "7",
   "Paragraph": "37",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_37_a&doctype=Standard&book=b",
   "URIDate": "2021-03-24"
  },
  "r235": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Expiry date 2023-01-01",
   "Number": "7",
   "Paragraph": "37",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_37_b&doctype=Standard&book=b",
   "URIDate": "2021-03-24"
  },
  "r236": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Expiry date 2023-01-01",
   "Number": "7",
   "Paragraph": "37",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_37&doctype=Standard&book=b",
   "URIDate": "2021-03-24"
  },
  "r237": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Expiry date 2023-01-01",
   "Number": "7",
   "Paragraph": "IG28",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_IG28_b&doctype=Implementation%20Guidance&book=b",
   "URIDate": "2021-03-24"
  },
  "r238": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Expiry date 2023-01-01",
   "Number": "7",
   "Paragraph": "IG29",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_IG29_a&doctype=Implementation%20Guidance&book=b",
   "URIDate": "2021-03-24"
  },
  "r239": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Expiry date 2023-01-01",
   "Number": "7",
   "Paragraph": "IG29",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_IG29_b&doctype=Implementation%20Guidance&book=b",
   "URIDate": "2021-03-24"
  },
  "r24": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "78",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r240": {
   "IssueDate": "2021-01-01",
   "Name": "IFRS",
   "Note": "Expiry date 2023-01-01",
   "Number": "7",
   "Paragraph": "IG29",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_IG29&doctype=Implementation%20Guidance&book=b",
   "URIDate": "2021-03-24"
  },
  "r241": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12"
  },
  "r242": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b"
  },
  "r243": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r244": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "d1-1"
  },
  "r245": {
   "Name": "Form 10-K",
   "Number": "249",
   "Publisher": "SEC",
   "Section": "310"
  },
  "r246": {
   "Name": "Form 20-F",
   "Number": "249",
   "Publisher": "SEC",
   "Section": "220",
   "Subsection": "f"
  },
  "r247": {
   "Name": "Form 40-F",
   "Number": "249",
   "Publisher": "SEC",
   "Section": "240",
   "Subsection": "f"
  },
  "r248": {
   "Name": "Forms 10-K, 10-Q, 20-F",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-1"
  },
  "r249": {
   "Name": "Regulation S-T",
   "Number": "232",
   "Publisher": "SEC",
   "Section": "405"
  },
  "r25": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "78",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r250": {
   "Name": "Securities Act",
   "Number": "230",
   "Publisher": "SEC",
   "Section": "405"
  },
  "r251": {
   "Name": "Securities Act",
   "Number": "7A",
   "Publisher": "SEC",
   "Section": "B",
   "Subsection": "2"
  },
  "r26": {
   "Clause": "iv",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "79",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_iv&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r27": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "79",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r28": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "81A",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_81A_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r29": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "81A",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_81A_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r3": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "106",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r30": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "81B",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_81B_a_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r31": {
   "Clause": "ii",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "81B",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_81B_a_ii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r32": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "85",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r33": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "99",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_99&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r34": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "IG6",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_IG6&doctype=Implementation%20Guidance",
   "URIDate": "2021-03-24"
  },
  "r35": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "12",
   "Paragraph": "80",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_80_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r36": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "12",
   "Paragraph": "81",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r37": {
   "Clause": "ii",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "12",
   "Paragraph": "81",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_ii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r38": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "12",
   "Paragraph": "81",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r39": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "12",
   "Paragraph": "81",
   "Subparagraph": "g",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r4": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "106",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r40": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "12",
   "Paragraph": "81",
   "Subparagraph": "g",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r41": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "12",
   "Section": "Disclosure",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IAS12_g79-88_TI",
   "URIDate": "2021-03-24"
  },
  "r42": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "37",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_37_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r43": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "37",
   "Subparagraph": "h",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_37_h&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r44": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "37",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_37&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r45": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "73",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r46": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "73",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_d&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r47": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "73",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r48": {
   "Clause": "ii",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "73",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_ii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r49": {
   "Clause": "vii",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "73",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_vii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r5": {
   "Clause": "iii",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "106",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d_iii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r50": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "73",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r51": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "73",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r52": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "75",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_75_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r53": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Paragraph": "75",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_75_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r54": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "16",
   "Section": "Disclosure",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IAS16_g73-79_TI",
   "URIDate": "2021-03-24"
  },
  "r55": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "19",
   "Paragraph": "145",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r56": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "19",
   "Paragraph": "147",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_147_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r57": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "19",
   "Paragraph": "53",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_53&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r58": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "19",
   "Section": "Scope",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IAS19_g2-7_TI",
   "URIDate": "2021-03-24"
  },
  "r59": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "20",
   "Paragraph": "39",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=20&code=ifrs-tx-2021-en-r&anchor=para_39_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r6": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "106",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r60": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "20",
   "Section": "Disclosure",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=20&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IAS20_g39-39_TI",
   "URIDate": "2021-03-24"
  },
  "r61": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "24",
   "Paragraph": "17",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r62": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "24",
   "Paragraph": "17",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r63": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "24",
   "Paragraph": "17",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r64": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "24",
   "Paragraph": "18",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_18_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r65": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "24",
   "Paragraph": "19",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_19_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r66": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "24",
   "Paragraph": "19",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_19&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r67": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "24",
   "Paragraph": "20",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_20&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r68": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "24",
   "Section": "Disclosures",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IAS24_g13-24_TI",
   "URIDate": "2021-03-24"
  },
  "r69": {
   "Clause": "iii",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "27",
   "Paragraph": "16",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_16_b_iii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r7": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "106",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r70": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "27",
   "Paragraph": "16",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_16_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r71": {
   "Clause": "iii",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "27",
   "Paragraph": "17",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_17_b_iii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r72": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "27",
   "Paragraph": "17",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_17_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r73": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "33",
   "Paragraph": "66",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_66&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r74": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "33",
   "Paragraph": "67",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_67&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r75": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "33",
   "Paragraph": "70",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_70_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r76": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "33",
   "Paragraph": "70",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_70_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r77": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "33",
   "Section": "Disclosure",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IAS33_g70-73A_TI",
   "URIDate": "2021-03-24"
  },
  "r78": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "126",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_126&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r79": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "127",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_127&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r8": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "108",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_108&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r80": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "130",
   "Subparagraph": "b",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_130_b&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r81": {
   "Clause": "ii",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "130",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_130_d_ii&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r82": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "134",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r83": {
   "Clause": "iv",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "134",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_d_iv&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r84": {
   "Clause": "v",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "134",
   "Subparagraph": "d",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_d_v&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r85": {
   "Clause": "iv",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "134",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_e_iv&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r86": {
   "Clause": "v",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "134",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_e_v&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r87": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "134",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r88": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "135",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_135_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r89": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "36",
   "Paragraph": "135",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_135&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r9": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "1",
   "Paragraph": "112",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r90": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "37",
   "Paragraph": "86",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_86&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r91": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "38",
   "Paragraph": "118",
   "Subparagraph": "a",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_a&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r92": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "38",
   "Paragraph": "118",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_c&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r93": {
   "Clause": "i",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "38",
   "Paragraph": "118",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_i&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r94": {
   "Clause": "vi",
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "38",
   "Paragraph": "118",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_vi&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r95": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "38",
   "Paragraph": "118",
   "Subparagraph": "e",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r96": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "38",
   "Paragraph": "118",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r97": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "38",
   "Paragraph": "126",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_126&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r98": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "40",
   "Paragraph": "76",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2021-en-r&anchor=para_76&doctype=Standard",
   "URIDate": "2021-03-24"
  },
  "r99": {
   "IssueDate": "2021-01-01",
   "Name": "IAS",
   "Number": "40",
   "Paragraph": "79",
   "Subparagraph": "c",
   "URI": "http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2021-en-r&anchor=para_79_c&doctype=Standard",
   "URIDate": "2021-03-24"
  }
 },
 "version": "2.1"
}
