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INTANGIBLE ASSETS (Details Textual) - USD ($) $ in Millions	6 Months Ended
	Jun. 27, 2021	Dec. 27, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, accumulated amortization	$ 49.9	$ 48.5
Capitalized computer software, additions	0.1
Capitalized computer software, period increase	$ 1.1

X

- Definition

Intangible Assets, Accumulated Amortization

+ References

No definition available.

+ Details

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

X

- Definition

Additions made to capitalized computer software costs during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of increase (decrease) in capitalized computer software costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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- References

No definition available.

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