<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>400</ContextCount>
  <ElementCount>426</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>132</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>13</UnitCount>
  <MyReports>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>1001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1002 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1003 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1004 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/ConsolidatedStatementsOfOperations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1005 - Statement - Consolidated Statements of Operations (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/ConsolidatedStatementsOfOperationsParenthetical</Role>
      <ShortName>Consolidated Statements of Operations (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1006 - Statement - Consolidated Statements of Other Comprehensive Income (loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/ConsolidatedStatementsOfOtherComprehensiveIncomeLoss</Role>
      <ShortName>Consolidated Statements of Other Comprehensive Income (loss)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1007 - Statement - Consolidated Statements of Changes in Stockholders' Equity (deficiency)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/ConsolidatedStatementsOfChangesInStockholdersEquityDeficiency</Role>
      <ShortName>Consolidated Statements of Changes in Stockholders' Equity (deficiency)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>1008 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/ConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>999001 - Disclosure - Basis of presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BasisOfPresentation</Role>
      <ShortName>Basis of presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>999002 - Disclosure - Significant accounting policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SignificantAccountingPolicies</Role>
      <ShortName>Significant accounting policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>999003 - Disclosure - Accounts receivable and other receivables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/AccountsReceivableAndOtherReceivables</Role>
      <ShortName>Accounts receivable and other receivables</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>999004 - Disclosure - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/Inventories</Role>
      <ShortName>Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>999005 - Disclosure - Property and equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/PropertyAndEquipment</Role>
      <ShortName>Property and equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>999006 - Disclosure - Bank indebtedness</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BankIndebtedness</Role>
      <ShortName>Bank indebtedness</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>999007 - Disclosure - Accrued liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/AccruedLiabilities</Role>
      <ShortName>Accrued liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>999008 - Disclosure - Long-term debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LongTermDebt</Role>
      <ShortName>Long-term debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>999009 - Disclosure - Other long-term liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/OtherLongTermLiabilities</Role>
      <ShortName>Other long-term liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>999010 - Disclosure - Benefit plans and stock-based compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BenefitPlansAndStockBasedCompensation</Role>
      <ShortName>Benefit plans and stock-based compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>999011 - Disclosure - Income taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/IncomeTaxes</Role>
      <ShortName>Income taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>999012 - Disclosure - Capital stock</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/CapitalStock</Role>
      <ShortName>Capital stock</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>999013 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>999014 - Disclosure - Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/Contingencies</Role>
      <ShortName>Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>999015 - Disclosure - Segmented information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SegmentedInformation</Role>
      <ShortName>Segmented information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>999016 - Disclosure - Related party transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/RelatedPartyTransactions</Role>
      <ShortName>Related party transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>999017 - Disclosure - Financial instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/FinancialInstruments</Role>
      <ShortName>Financial instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>999018 - Disclosure - Government grants</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/GovernmentGrants</Role>
      <ShortName>Government grants</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>999019 - Disclosure - Subsequent events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>999020 - Disclosure - Insider Trading Policy</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/InsiderTradingPolicy</Role>
      <ShortName>Insider Trading Policy</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>999021 - Disclosure - Significant accounting policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SignificantAccountingPoliciesPolicies</Role>
      <ShortName>Significant accounting policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>999022 - Disclosure - Significant accounting policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SignificantAccountingPoliciesTables</Role>
      <ShortName>Significant accounting policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/SignificantAccountingPolicies</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>999023 - Disclosure - Accounts receivable and other receivables (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/AccountsReceivableAndOtherReceivablesTables</Role>
      <ShortName>Accounts receivable and other receivables (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/AccountsReceivableAndOtherReceivables</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>999024 - Disclosure - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/InventoriesTables</Role>
      <ShortName>Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/Inventories</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>999025 - Disclosure - Property and equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/PropertyAndEquipmentTables</Role>
      <ShortName>Property and equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/PropertyAndEquipment</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>999026 - Disclosure - Bank indebtedness (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BankIndebtednessTables</Role>
      <ShortName>Bank indebtedness (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/BankIndebtedness</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>999027 - Disclosure - Accrued liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/AccruedLiabilitiesTables</Role>
      <ShortName>Accrued liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/AccruedLiabilities</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>999028 - Disclosure - Long-term debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LongTermDebtTables</Role>
      <ShortName>Long-term debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/LongTermDebt</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>999029 - Disclosure - Benefit plans and stock-based compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BenefitPlansAndStockBasedCompensationTables</Role>
      <ShortName>Benefit plans and stock-based compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/BenefitPlansAndStockBasedCompensation</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>999030 - Disclosure - Income taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/IncomeTaxesTables</Role>
      <ShortName>Income taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/IncomeTaxes</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>999031 - Disclosure - Capital stock (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/CapitalStockTables</Role>
      <ShortName>Capital stock (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/CapitalStock</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>999032 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/Leases</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>999033 - Disclosure - Segmented information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SegmentedInformationTables</Role>
      <ShortName>Segmented information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/SegmentedInformation</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>999034 - Disclosure - Related party transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/RelatedPartyTransactionsTables</Role>
      <ShortName>Related party transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.birksgroup.com/role/RelatedPartyTransactions</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>999035 - Disclosure - Basis of Presentation - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BasisOfPresentationAdditionalInformationDetail</Role>
      <ShortName>Basis of Presentation - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>999036 - Disclosure - Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>999037 - Disclosure - Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SignificantAccountingPoliciesEstimatedUsefulLivesOfAssetsDetail</Role>
      <ShortName>Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>999038 - Disclosure - Significant Accounting Policies - Basic and Diluted Earnings Per Common Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SignificantAccountingPoliciesBasicAndDilutedEarningsPerCommonShareDetail</Role>
      <ShortName>Significant Accounting Policies - Basic and Diluted Earnings Per Common Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>999039 - Disclosure - Accounts Receivable and Other Receivables - Summary of Accounts Receivable, Net of Allowance for Doubtful Accounts (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/AccountsReceivableAndOtherReceivablesSummaryOfAccountsReceivableNetOfAllowanceForDoubtfulAccountsDetail</Role>
      <ShortName>Accounts Receivable and Other Receivables - Summary of Accounts Receivable, Net of Allowance for Doubtful Accounts (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>999040 - Disclosure - Accounts Receivable and Other Receivables - Schedule of Continuity of Allowance for Doubtful Accounts (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/AccountsReceivableAndOtherReceivablesScheduleOfContinuityOfAllowanceForDoubtfulAccountsDetail</Role>
      <ShortName>Accounts Receivable and Other Receivables - Schedule of Continuity of Allowance for Doubtful Accounts (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>999041 - Disclosure - Accounts receivable and other receivables - Summary of Disaggregates the Company's Accounts Receivables and Long-Term Receivables (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/AccountsReceivableAndOtherReceivablesSummaryOfDisaggregatesTheCompanySAccountsReceivablesAndLongTermReceivablesDetail</Role>
      <ShortName>Accounts receivable and other receivables - Summary of Disaggregates the Company's Accounts Receivables and Long-Term Receivables (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>999042 - Disclosure - Accounts Receivable and Other Receivables - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/AccountsReceivableAndOtherReceivablesAdditionalInformationDetail</Role>
      <ShortName>Accounts Receivable and Other Receivables - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>999043 - Disclosure - Inventories - Summary of Inventories, Net of Reserves (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/InventoriesSummaryOfInventoriesNetOfReservesDetail</Role>
      <ShortName>Inventories - Summary of Inventories, Net of Reserves (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>999044 - Disclosure - Inventories - Summary of Inventories, Net of Reserves (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/InventoriesSummaryOfInventoriesNetOfReservesParentheticalDetail</Role>
      <ShortName>Inventories - Summary of Inventories, Net of Reserves (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>999045 - Disclosure - Inventories - Continuity of the Inventory Reserves (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/InventoriesContinuityOfTheInventoryReservesDetail</Role>
      <ShortName>Inventories - Continuity of the Inventory Reserves (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>999046 - Disclosure - Property and Equipment - Components of Property and Equipment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/PropertyAndEquipmentComponentsOfPropertyAndEquipmentDetail</Role>
      <ShortName>Property and Equipment - Components of Property and Equipment (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>999047 - Disclosure - Property and Equipment - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/PropertyAndEquipmentAdditionalInformationDetail</Role>
      <ShortName>Property and Equipment - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>999048 - Disclosure - Bank Indebtedness - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BankIndebtednessAdditionalInformationDetail</Role>
      <ShortName>Bank Indebtedness - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>999049 - Disclosure - Bank Indebtedness - Summary of Company's Senior Credit Facility (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BankIndebtednessSummaryOfCompanysSeniorCreditFacilityDetail</Role>
      <ShortName>Bank Indebtedness - Summary of Company's Senior Credit Facility (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>999050 - Disclosure - Accrued liabilities - Schedule of Accrued Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/AccruedLiabilitiesScheduleOfAccruedLiabilitiesDetail</Role>
      <ShortName>Accrued liabilities - Schedule of Accrued Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>999051 - Disclosure - Long-term debt - Summary of Long Term Debt (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LongTermDebtSummaryOfLongTermDebtDetail</Role>
      <ShortName>Long-term debt - Summary of Long Term Debt (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>999052 - Disclosure - Long-term debt - Summary of Long Term Debt (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LongTermDebtSummaryOfLongTermDebtParentheticalDetail</Role>
      <ShortName>Long-term debt - Summary of Long Term Debt (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>999053 - Disclosure - Long-term debt - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LongTermDebtAdditionalInformationDetail</Role>
      <ShortName>Long-term debt - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>999054 - Disclosure - Long-term debt - Summary of Future Minimum Lease Payments for Finance Leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LongTermDebtSummaryOfFutureMinimumLeasePaymentsForFinanceLeasesDetail</Role>
      <ShortName>Long-term debt - Summary of Future Minimum Lease Payments for Finance Leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>999055 - Disclosure - Long-term debt - Summary of Principal Payment on Long Term Debt Including Obligation Under Finance Lease (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LongTermDebtSummaryOfPrincipalPaymentOnLongTermDebtIncludingObligationUnderFinanceLeaseDetail</Role>
      <ShortName>Long-term debt - Summary of Principal Payment on Long Term Debt Including Obligation Under Finance Lease (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>999056 - Disclosure - Other long-term liabilities - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/OtherLongTermLiabilitiesAdditionalInformationDetail</Role>
      <ShortName>Other long-term liabilities - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>999057 - Disclosure - Benefit Plans and Stock-Based Compensation - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BenefitPlansAndStockBasedCompensationAdditionalInformationDetail</Role>
      <ShortName>Benefit Plans and Stock-Based Compensation - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>999058 - Disclosure - Benefit Plans and Stock-Based Compensation - Summary of Activity of Stock Option Plans and Arrangements (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BenefitPlansAndStockBasedCompensationSummaryOfActivityOfStockOptionPlansAndArrangementsDetail</Role>
      <ShortName>Benefit Plans and Stock-Based Compensation - Summary of Activity of Stock Option Plans and Arrangements (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>999059 - Disclosure - Benefit Plans and Stock-Based Compensation - Summary of Status of Stock Options (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BenefitPlansAndStockBasedCompensationSummaryOfStatusOfStockOptionsDetail</Role>
      <ShortName>Benefit Plans and Stock-Based Compensation - Summary of Status of Stock Options (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>999060 - Disclosure - Benefit Plans and Stock-Based Compensation - Summary of Birks' Restricted Stock Units And Deferred Share Units (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/BenefitPlansAndStockBasedCompensationSummaryOfBirksRestrictedStockUnitsAndDeferredShareUnitsDetail</Role>
      <ShortName>Benefit Plans and Stock-Based Compensation - Summary of Birks' Restricted Stock Units And Deferred Share Units (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>999061 - Disclosure - Income taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/IncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>999062 - Disclosure - Income Taxes - Summary of Net Deferred Tax Assets Related to Continuing Operations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/IncomeTaxesSummaryOfNetDeferredTaxAssetsRelatedToContinuingOperationsDetail</Role>
      <ShortName>Income Taxes - Summary of Net Deferred Tax Assets Related to Continuing Operations (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>999063 - Disclosure - Income Taxes - Components of Income Tax Expense (Benefit) from Continuing Operations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/IncomeTaxesComponentsOfIncomeTaxExpenseBenefitFromContinuingOperationsDetail</Role>
      <ShortName>Income Taxes - Components of Income Tax Expense (Benefit) from Continuing Operations (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>999064 - Disclosure - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/IncomeTaxesScheduleOfEffectiveIncomeTaxRateReconciliationDetail</Role>
      <ShortName>Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>999065 - Disclosure - Income Taxes - Summary of Non Capital Losses (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/IncomeTaxesSummaryOfNonCapitalLossesDetail</Role>
      <ShortName>Income Taxes - Summary of Non Capital Losses (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>999066 - Disclosure - Capital Stock - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/CapitalStockAdditionalInformationDetail</Role>
      <ShortName>Capital Stock - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>999067 - Disclosure - Capital Stock - Summary of Common Stock Outstanding (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/CapitalStockSummaryOfCommonStockOutstandingDetail</Role>
      <ShortName>Capital Stock - Summary of Common Stock Outstanding (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>999068 - Disclosure - Leases - Summary of Consolidated Statement Of Earnings (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LeasesSummaryOfConsolidatedStatementOfEarningsDetail</Role>
      <ShortName>Leases - Summary of Consolidated Statement Of Earnings (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>999069 - Disclosure - Leases - Summary of Consolidated Statement Of Earnings (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LeasesSummaryOfConsolidatedStatementOfEarningsParentheticalDetail</Role>
      <ShortName>Leases - Summary of Consolidated Statement Of Earnings (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>999070 - Disclosure - Leases - Summary Of Supplemental Cash Flow Information Operating Lease (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LeasesSummaryOfSupplementalCashFlowInformationOperatingLeaseDetail</Role>
      <ShortName>Leases - Summary Of Supplemental Cash Flow Information Operating Lease (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>999071 - Disclosure - Leases - Summary Of Supplemental Cash Flow Information Operating Lease (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LeasesSummaryOfSupplementalCashFlowInformationOperatingLeaseParentheticalDetail</Role>
      <ShortName>Leases - Summary Of Supplemental Cash Flow Information Operating Lease (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>999072 - Disclosure - Leases - Summary Of Consolidated Balance Sheet For Operating Leases And Finance Leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LeasesSummaryOfConsolidatedBalanceSheetForOperatingLeasesAndFinanceLeasesDetail</Role>
      <ShortName>Leases - Summary Of Consolidated Balance Sheet For Operating Leases And Finance Leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>999073 - Disclosure - Leases - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/LeasesAdditionalInformationDetail</Role>
      <ShortName>Leases - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>999074 - Disclosure - Segmented Information - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SegmentedInformationAdditionalInformationDetail</Role>
      <ShortName>Segmented Information - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>999075 - Disclosure - Segmented Information - Schedule of Information Relating to Segments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SegmentedInformationScheduleOfInformationRelatingToSegmentsDetail</Role>
      <ShortName>Segmented Information - Schedule of Information Relating to Segments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>999076 - Disclosure - Segmented Information - Schedule of Information Relating to Segments (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SegmentedInformationScheduleOfInformationRelatingToSegmentsParentheticalDetail</Role>
      <ShortName>Segmented Information - Schedule of Information Relating to Segments (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>999077 - Disclosure - Segmented Information - Schedule of Reconciliations of Segments Gross Profits and Certain Unallocated Costs to Consolidated Gross Profits (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SegmentedInformationScheduleOfReconciliationsOfSegmentsGrossProfitsAndCertainUnallocatedCostsToConsolidatedGrossProfitsDetail</Role>
      <ShortName>Segmented Information - Schedule of Reconciliations of Segments Gross Profits and Certain Unallocated Costs to Consolidated Gross Profits (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>999078 - Disclosure - Segmented Information - Summary of Sales by Classes of Similar Products (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SegmentedInformationSummaryOfSalesByClassesOfSimilarProductsDetail</Role>
      <ShortName>Segmented Information - Summary of Sales by Classes of Similar Products (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>999079 - Disclosure - Related Party Transactions - Balance Related to Related Parties (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/RelatedPartyTransactionsBalanceRelatedToRelatedPartiesDetail</Role>
      <ShortName>Related Party Transactions - Balance Related to Related Parties (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>999080 - Disclosure - Related party transactions - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/RelatedPartyTransactionsAdditionalInformationDetail</Role>
      <ShortName>Related party transactions - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>999081 - Disclosure - Financial Instruments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/FinancialInstrumentsAdditionalInformationDetail</Role>
      <ShortName>Financial Instruments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>999082 - Disclosure - Government grants - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/GovernmentGrantsAdditionalInformationDetail</Role>
      <ShortName>Government grants - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="d795080d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>999083 - Disclosure - Subsequent Events - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.birksgroup.com/role/SubsequentEventsAdditionalInformationDetail</Role>
      <ShortName>Subsequent Events - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>bgi-20240330.xsd</File>
    <File>bgi-20240330_cal.xml</File>
    <File>bgi-20240330_def.xml</File>
    <File>bgi-20240330_lab.xml</File>
    <File>bgi-20240330_pre.xml</File>
    <File doctype="20-F" isDefinitelyFs="true" isUsgaap="true" original="d795080d20f.htm">d795080d20f.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="891">http://fasb.org/us-gaap/2023</BaseTaxonomy>
    <BaseTaxonomy items="47">http://xbrl.sec.gov/dei/2023</BaseTaxonomy>
    <BaseTaxonomy items="1">http://xbrl.sec.gov/ecd/2023</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
