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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) - USD ($)
$ in Thousands
Sep. 25, 2015
Dec. 26, 2014
Workers' Compensation Deductible Limit [Line Items]    
Undiscounted workers’ compensation reserve $ 267,251 $ 256,220
Less discount on workers' compensation reserve 14,388 13,381
Workers' compensation reserve, net of discount 252,863 242,839
Less current portion 63,885 64,556
Long-term portion $ 188,978 $ 178,283