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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Sep. 23, 2016
Dec. 25, 2015
Workers' Compensation Deductible Limit [Line Items]    
Undiscounted workers’ compensation reserve $ 296,599 $ 284,306
Less discount on workers' compensation reserve 18,381 18,026
Workers' compensation reserve, net of discount 278,218 266,280
Less current portion 68,131 69,308
Long-term portion $ 210,087 $ 196,972