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Fair Value Measurement - Summary of Investments (Parenthetical) (Detail)	Sep. 30, 2016 USD ($)
Fair Value Disclosures [Abstract]
Workers compensation deposits	$ 306,000

X

- Definition

Workers compensation deposits.

+ References

No definition available.

+ Details

Name:	bbsi_WorkersCompensationDeposits
Namespace Prefix:	bbsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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