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Leases - Summary Of Supplemental Cash Flow Information Operating Lease (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Mar. 29, 2025 | Mar. 30, 2024 | Mar. 25, 2023
Summary Of Supplemental Cash Flow Information Operating Lease [Line Items] |  |  |
Rent Concessions associated to base rent | $ 0.0 | $ 0.0 | $ 0.2
Leasehold Inducements | 1.9 | 1.7 |
Accounts Receivable and other receivables [Member] |  |  |
Summary Of Supplemental Cash Flow Information Operating Lease [Line Items] |  |  |
Leasehold Inducements | $ 0.3 | $ 0.8 |

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- Definition Rent concessions associated to base rent amount. + References No definition available. + Details
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- Definition Right of use assets , leasehold inducements received net. + References No definition available. + Details
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Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Summary of supplemental cash flow information operating lease . + References No definition available. + Details
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Namespace Prefix: | bgi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |