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Long-term debt - Summary of Principal Payment on Long Term Debt Including Obligation Under Finance Lease (Detail) $ in Thousands	Mar. 28, 2020 USD ($)
Debt Disclosure [Abstract]
2021	$ 64
2022	1,814
2023	12,546
2024	17
2025	3
Thereafter	2,109
Total	$ 16,553

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- Definition

long term debt including finance lease obligation repayment due after year five.

+ References

No definition available.

+ Details

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

X

- Definition

Long term debt including finance lease obligation repayment due year five.

+ References

No definition available.

+ Details

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

X

- Definition

Long term debt including finance lease obligation repayment due year four.

+ References

No definition available.

+ Details

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

X

- Definition

Long term debt including finance lease obligation repayment due year one.

+ References

No definition available.

+ Details

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

X

- Definition

Long term debt including finance lease obligation repayment due year three.

+ References

No definition available.

+ Details

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

X

- Definition

Long term debt including finance lease obligation repayment due year two.

+ References

No definition available.

+ Details

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

X

- Definition

Long term debt including finance lease obligation repayment,total.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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