XML 39 R30.htm IDEA: XBRL DOCUMENT v3.22.2.2
Workers' Compensation Claims - Additional Information (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Jul. 01, 2022
Jul. 01, 2021
Jun. 29, 2020
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Description of renewed agreement       The Company entered into a new arrangement for its insured program effective July 1, 2021 whereby third-party insurers assumed all risk of loss for claims incurred from July 1, 2021 to June 30, 2022 (the “2021-2022 Policy”). The 2021-2022 Policy allows for premium adjustments depending on overall policy performance. If claims develop favorably, BBSI can participate in the savings up to $20.0 million for the twelve-month policy period. If claims develop adversely, additional premium may be charged up to $7.5 million for a twelve-month policy period.          
Maximum savings amount for twelve month policy period, if claims develop favorably       $ 20,000,000.0          
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely       7,500,000          
Balance in Chubb trust accounts     $ 115,700,000 198,600,000   $ 273,600,000      
Workers compensation liability       227,343,000 $ 296,999,000 279,407,000 $ 241,510,000 $ 315,733,000 $ 357,746,000
Collateral securities maintain to cover potential workers compensation claims losses       54,500,000   58,400,000      
Surety bonds       54,500,000          
Reserves incurred in excess of retention limits       3,000,000.0   2,200,000      
Other Assets [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Accrual for costs incurred in excess of retention limits offset by a receivable       3,000,000.0   $ 2,200,000      
California [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Surety bonds       $ 22,300,000          
2022-2023 Policy [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Description of renewed agreement       Effective July 1, 2022, the Company renewed the arrangement for its insured program, which now continues to June 30, 2023 (the “2022-2023 Policy”). Under the renewed arrangement, the Company can participate in savings up to $22.5 million for the twelve-month policy period. For the 2022-2023 Policy, no additional premium may be charged if claims develop adversely. The 2022-2023 Policy includes a renewal commitment through June 30, 2024.          
Maximum savings amount for twelve month policy period, if claims develop favorably $ 22,500,000                
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely $ 0                
Insured Program [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Percentage of worker's compensation exposure covered       82.00%          
Worker's compensation risk claim maximum   $ 3,000,000.0              
Worker's compensation risk claim maximum     $ 5,000,000.0            
Workers compensation liability       $ 53,100,000          
Self Insured Programs [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Percentage of worker's compensation exposure covered       18.00%          
Worker's compensation risk claim maximum       $ 3,000,000.0 $ 5,000,000.0        
Self Insured Programs [Member] | Maryland [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Reinsurance coverage       1,000,000.0          
Self Insured Programs [Member] | Colorado [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Reinsurance coverage       $ 2,000,000.0