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DISCONTINUED OPERATIONS - Narrative (Details) - Subsequent Event - Discontinued Operations, Held-for-sale - Instaff $ in Millions	Feb. 28, 2022 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration	$ 30.3
Additional consideration	$ 2.0

X

- Definition

Disposal Group, Including Discontinued Operation, Additional Consideration

+ References

No definition available.

+ Details

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

X

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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X

- Details

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X

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsHeldforsaleMember
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Data Type:	na
Balance Type:
Period Type:

X

- Details

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