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Government grants - Additional Information (Details) $ in Millions	12 Months Ended
	Mar. 27, 2021 USD ($)
Canadian emergency wage subsidy program [Member]
Government Grants [Line Items]
Proceeds from government grant	$ 1.0
Canadian emergency rent subsidy program [Member]
Government Grants [Line Items]
Proceeds from government grant	0.0
Accounts receivable [Member] | Canadian emergency wage subsidy program [Member]
Government Grants [Line Items]
Government grant receivable	0.4
Accounts receivable [Member] | Canadian emergency rent subsidy program [Member]
Government Grants [Line Items]
Government grant receivable	0.5
Selling general and administrative expenses [Member] | Canadian emergency wage subsidy program [Member]
Government Grants [Line Items]
Government grant recognized	1.4
Selling general and administrative expenses [Member] | Canadian emergency rent subsidy program [Member]
Government Grants [Line Items]
Government grant recognized	$ 0.5

X

- Definition

Government grant receivable.

+ References

No definition available.

+ Details

Name:	bgi_GovernmentGrantReceivable
Namespace Prefix:	bgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Government grant recognized.

+ References

No definition available.

+ Details

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

X

- Definition

Government grants.

+ References

No definition available.

+ Details

Name:	bgi_GovernmentGrantsLineItems
Namespace Prefix:	bgi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Proceeds from government grant.

+ References

No definition available.

+ Details

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

X

- Details

Name:	bgi_GovernmentSubsidyProgramAxis=bgi_CanadianEmergencyWageSubsidyProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	bgi_GovernmentSubsidyProgramAxis=bgi_CanadianEmergencyRentSubsidyProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: