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Government grants - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 30, 2024 | Mar. 25, 2023 | Mar. 26, 2022
Accounts receivable [Member] | Canadian emergency wage subsidy program [Member] |  |  |
Government Grants [Line Items] |  |  |
Government grant receivable | $ 0.0 | $ 0.0 |
Accounts receivable [Member] | Canadian emergency rent subsidy program [Member] |  |  |
Government Grants [Line Items] |  |  |
Government grant receivable | 0.0 | 0.0 |
Selling general and administrative expenses [Member] | Canadian emergency wage subsidy program [Member] |  |  |
Government Grants [Line Items] |  |  |
Government grant recognized | 0.0 | 0.0 | $ 0.5
Selling general and administrative expenses [Member] | Canadian emergency rent subsidy program [Member] |  |  |
Government Grants [Line Items] |  |  |
Government grant recognized | $ 0.0 | $ 0.0 | $ 0.5

X
- Definition Government grant receivable. + References No definition available. + Details
Name: | bgi_GovernmentGrantReceivable
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Government grant recognized. + References No definition available. + Details
Name: | bgi_GovernmentGrantRecognized
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Government grants. + References No definition available. + Details
Name: | bgi_GovernmentGrantsLineItems
Namespace Prefix: | bgi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bgi_GovernmentSubsidyProgramAxis=bgi_CanadianEmergencyWageSubsidyProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bgi_GovernmentSubsidyProgramAxis=bgi_CanadianEmergencyRentSubsidyProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |