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Inventories - Continuity of the Inventory Reserves (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 26, 2022 | Mar. 27, 2021 | Mar. 28, 2020
Inventory Disclosure [Abstract] |  |  |
Beginning balance | $ 1,938 | $ 1,847 | $ 1,895
Additional charges | 85 | 291 | 342
Deductions | (248) | (200) | (390)
Ending balance | $ 1,775 | $ 1,938 | $ 1,847

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- Definition Additional Charges Of Obsolescence Reserve For Inventory + References No definition available. + Details
Name: | bgi_AdditionalChargesOfObsolescenceReserveForInventory
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deductions Of Obsolescence Reserve For Inventory + References No definition available. + Details
Name: | bgi_DeductionsOfObsolescenceReserveForInventory
Namespace Prefix: | bgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Inventory Obsolescence + References No definition available. + Details
Name: | bgi_InventoryObsolescence
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_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration