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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Dec. 29, 2019
Dec. 30, 2018
Workers' Compensation Deductible Limit [Line Items]    
Undiscounted workers’ compensation reserve $ 274,934 $ 284,625
Less discount on workers' compensation reserve 19,316 18,179
Workers' compensation reserve, net of discount 255,618 266,446
Less current portion 73,020 76,421
Long-term portion $ 182,598 $ 190,025