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Long-term debt - Summary of Principal Payment on Long Term Debt Including Obligation Under Finance Lease (Detail) $ in Thousands	Mar. 27, 2021 USD ($)
Debt Disclosure [Abstract]
2022	$ 2,981
2023	14,575
2024	2,069
2025	2,068
2026	2,054
Thereafter	2,554
Total	$ 26,301

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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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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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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
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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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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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X

- 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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