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Leases - Summary Of Supplemental Cash Flow Information Operating Lease (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Summary Of Supplemental Cash Flow Information Operating Lease [Line Items]
Rent Concessions associated to base rent	$ 4.2
Leasehold Inducements	2.3	$ 0.9
Accounts Receivable [Member]
Summary Of Supplemental Cash Flow Information Operating Lease [Line Items]
Leasehold Inducements	$ 1.1	$ 0.3

X

- Definition

Rent concessions associated to base rent amount.

+ References

No definition available.

+ Details

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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
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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_
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- Details

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Namespace Prefix:
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Balance Type:
Period Type: