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Long-term debt - Summary of Principal Payment on Long Term Debt Including Obligation Under Finance Lease (Detail) $ in Thousands | Mar. 29, 2025 USD ($)
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Debt Disclosure [Abstract] |
2026 | $ 4,860
2027 | 15,150
2028 | 734
2029 | 860
2030 | 860
Thereafter | 4,011
Total | $ 26,475

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- Definition long term debt including finance lease obligation repayment due after year five. + References No definition available. + Details
Name: | bgi_LongTermDebtIncludingFinanceLeaseObligationRepaymentDueAfterYearFive
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Long term debt including finance lease obligation repayment due year five. + References No definition available. + Details
Name: | bgi_LongTermDebtIncludingFinanceLeaseObligationRepaymentDueYearFive
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Long term debt including finance lease obligation repayment due year four. + References No definition available. + Details
Name: | bgi_LongTermDebtIncludingFinanceLeaseObligationRepaymentDueYearFour
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Long term debt including finance lease obligation repayment due year one. + References No definition available. + Details
Name: | bgi_LongTermDebtIncludingFinanceLeaseObligationRepaymentDueYearOne
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Long term debt including finance lease obligation repayment due year three. + References No definition available. + Details
Name: | bgi_LongTermDebtIncludingFinanceLeaseObligationRepaymentDueYearThree
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Long term debt including finance lease obligation repayment due year two. + References No definition available. + Details
Name: | bgi_LongTermDebtIncludingFinanceLeaseObligationRepaymentDueYearTwo
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Long term debt including finance lease obligation repayment,total. + References No definition available. + Details
Name: | bgi_LongTermDebtIncludingFinanceLeaseObligationRepaymenttotal
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration