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Leases - Summary Of Supplemental Cash Flow Information Operating Lease (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Mar. 30, 2024	Mar. 25, 2023	Mar. 26, 2022
Summary Of Supplemental Cash Flow Information Operating Lease [Line Items]
Rent Concessions associated to base rent	$ 0.0	$ 0.2	$ 1.5
Leasehold Inducements	1.7	0.1
Accounts Receivable and other receivables [Member]
Summary Of Supplemental Cash Flow Information Operating Lease [Line Items]
Leasehold Inducements	$ 0.8	$ 0.1

X

- Definition

Rent concessions associated to base rent amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgi_
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Balance Type:	credit
Period Type:	duration

X

- 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
Period Type:	duration

X

- 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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: