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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Jun. 28, 2020
Dec. 29, 2019
Workers' Compensation Insurance and Reserves [Abstract]    
Undiscounted workers’ compensation reserve $ 268,128 $ 274,934
Less discount on workers’ compensation reserve 18,178 19,316
Workers' compensation reserve, net of discount 249,950 255,618
Less current portion 66,193 73,020
Long-term portion $ 183,757 $ 182,598