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Long-term debt - Summary of Principal Payment on Long Term Debt Including Obligation Under Finance Lease (Detail) $ in Thousands	Mar. 26, 2022 USD ($)
Debt Disclosure [Abstract]
2023	$ 2,146
2024	2,141
2025	2,139
2026	1,794
2027	13,387
Thereafter	1,893
Total	$ 23,500

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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_
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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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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
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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
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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
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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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Data Type:	xbrli:monetaryItemType
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- Definition

Long term debt including finance lease obligation repayment,total.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- References

No definition available.

+ Details

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