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Worker's Compensation Claims - Summary of Risk Retained by Insured Program after Considering Loss Portfolio Transfers and Current Insurance Arrangements (Parenthetical) (Details)	9 Months Ended
	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Percentage of claim excluded	10.00%

X

- Definition

Percentage of claims excluded.

+ References

No definition available.

+ Details

Name:	bbsi_PercentageOfClaimsExcluded
Namespace Prefix:	bbsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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