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Government grants - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 26, 2022 | Mar. 27, 2021
Canadian emergency wage subsidy program [Member] |  |
Government Grants [Line Items] |  |
Proceeds from government grant | $ 0.5 | $ 1.4
Canadian emergency rent subsidy program [Member] |  |
Government Grants [Line Items] |  |
Proceeds from government grant | 0.5 | 0.0
Accounts receivable [Member] | Canadian emergency wage subsidy program [Member] |  |
Government Grants [Line Items] |  |
Government grant receivable | 0.0 | 0.4
Accounts receivable [Member] | Canadian emergency rent subsidy program [Member] |  |
Government Grants [Line Items] |  |
Government grant receivable | 0.0 | 0.5
Selling general and administrative expenses [Member] | Canadian emergency wage subsidy program [Member] |  |
Government Grants [Line Items] |  |
Government grant recognized | 0.5 | 1.4
Selling general and administrative expenses [Member] | Canadian emergency rent subsidy program [Member] |  |
Government Grants [Line Items] |  |
Government grant recognized | $ 0.5 | $ 0.5

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- 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

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- 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

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

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- Definition Proceeds from government grant. + References No definition available. + Details
Name: | bgi_ProceedsFromGovernmentGrant
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsReceivableMember
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: |