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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Jun. 27, 2021
Dec. 27, 2020
Workers' Compensation Insurance and Reserves [Abstract]    
Undiscounted workers’ compensation reserve $ 271,837 $ 273,502
Less discount on workers’ compensation reserve 16,942 18,009
Workers' compensation reserve, net of discount 254,895 255,493
Less current portion 60,032 66,007
Long-term portion $ 194,863 $ 189,486