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v3.25.1

Worker's Compensation Claims Liabilities - Summary of Risk Retained by Insured Program after Considering Loss Portfolio Transfers and Current Insurance Arrangements (Parenthetical) (Details) | 3 Months Ended
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Mar. 31, 2025
Share-Based Payment Arrangement [Abstract] |
Percentage of claim excluded | 10.00%

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- Definition Percentage of claims excluded. + References No definition available. + Details
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Namespace Prefix: | bbsi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration