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Long-term debt - Additional Information (Detail) $ in Millions	12 Months Ended
	Mar. 30, 2019 USD ($)	Mar. 31, 2018 USD ($)
Line of Credit Facility [Line Items]
Outstanding letters of credit	$ 1.0	$ 1.0
Investissement Quebec [Member]
Line of Credit Facility [Line Items]
Minimum capital ratio required	1.15

X

- Definition

Line of credit covenant working capital ratio minimum.

+ References

No definition available.

+ Details

Name:	bgi_LineOfCreditCovenantWorkingCapitalRatioMinimum
Namespace Prefix:	bgi_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=bgi_InvestissementQuebecMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: