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INTANGIBLE ASSETS (Details Textual) - USD ($) $ in Millions	Oct. 01, 2023	Jan. 01, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, accumulated amortization	$ 47.4	$ 44.6

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- Definition

Intangible Assets, Accumulated Amortization

+ References

No definition available.

+ Details

Name:	bgsf_IntangibleAssetsAccumulatedAmortization
Namespace Prefix:	bgsf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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