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Inventories - Continuity of the Inventory Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 25, 2023	Mar. 26, 2022	Mar. 27, 2021
Inventory Disclosure [Abstract]
Beginning balance	$ 1,775	$ 1,938	$ 1,847
Additional charges	330	85	291
Deductions	(230)	(248)	(200)
Ending balance	$ 1,875	$ 1,775	$ 1,938

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- Definition

Additional Charges Of Obsolescence Reserve For Inventory

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No definition available.

+ Details

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

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- 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

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- 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