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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2021
Dec. 27, 2020
Workers' Compensation Commitments [Line Items]    
Cash collateral held by workers’ compensation insurance carriers $ 23,056 $ 22,253
Cash and cash equivalents held in Trust 21,590 29,410
Investments held in Trust 135,419 152,247
Letters of credit 6,160 6,095
Surety bonds 21,969 20,616
Total collateral commitments $ 208,194 230,621
Surety bonds annual fee limit, % of bond amount 2.00%  
Remaining lease terms 15 years  
Renewal term 10 years  
Operating lease costs $ 16,502 16,607
Short-term lease costs 8,392 7,781
Other lease costs 3,886 3,922
Total lease costs $ 28,780 $ 28,310
Weighted average remaining lease term in years 8 years 9 months 18 days 9 years
Weighted average discount rate 4.90% 5.00%
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2022 $ 14,898  
2023 12,344  
2024 9,402  
2025 7,565  
2026 5,395  
Thereafter 33,412  
Total undiscounted future non-cancelable minimum lease payments 83,016  
Less: Imputed interest 15,992  
Present value of lease liabilities 67,024  
Pending lease 1,900  
Purchase obligation 33,300  
Purchase obligation, due in next twelve months 20,200  
Purchase obligation, to be paid, year two 11,400  
Purchase obligation, to be paid, year three 1,600  
Purchase obligation, to be paid, year four $ 100  
Minimum    
Workers' Compensation Commitments [Line Items]    
Surety bonds review and renewal period if elected 1 year  
Maximum    
Workers' Compensation Commitments [Line Items]    
Surety bonds review and renewal period if elected 4 years