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Inventories - Continuity of the Inventory Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	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

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No definition available.

+ Details

Name:	bgi_AdditionalChargesOfObsolescenceReserveForInventory
Namespace Prefix:	bgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Deductions Of Obsolescence Reserve For Inventory

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No definition available.

+ Details

Name:	bgi_DeductionsOfObsolescenceReserveForInventory
Namespace Prefix:	bgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Inventory Obsolescence

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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