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Leases - Summary of Consolidated Statement Of Earnings (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Mar. 27, 2021 USD ($)
Variable Rent Expense [Member]
Summary Of Consolidated Statement Of Earnings [Line Items]
Rent concessions recognized amount	$ 4.1

X

- Definition

Rent concessions recognized amount.

+ References

No definition available.

+ Details

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

X

- Definition

Summary of consolidated statement of earnings.

+ 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: