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Inventories - Continuity of the Inventory Reserves (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 29, 2025 | Mar. 30, 2024 | Mar. 25, 2023
Inventory Disclosure [Abstract] |  |  |
Beginning balance | $ 2,196 | $ 1,875 | $ 1,775
Additional charges | 565 | 688 | 330
Deductions | 325 | 367 | 230
Ending balance | $ 2,436 | $ 2,196 | $ 1,875

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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