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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Sep. 29, 2019
Dec. 30, 2018
Workers' Compensation Insurance and Reserves [Abstract]    
Undiscounted workers’ compensation reserve $ 277,395 $ 284,625
Less discount on workers’ compensation reserve 18,125 18,179
Workers' compensation reserve, net of discount 259,270 266,446
Less current portion 73,509 76,421
Long-term portion $ 185,761 $ 190,025