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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) (USD $)
Mar. 28, 2014
Dec. 27, 2013
Workers' Compensation Insurance and Reserves [Abstract]    
Undiscounted workers’ compensation reserve $ 234,400,000 $ 234,400,000
Less discount on workers' compensation reserve 19,300,000 19,600,000
Workers' compensation reserve, net of discount 215,100,000 214,800,000
Less current portion 48,803,000 49,942,000
Workers’ compensation claims reserve, less current portion $ 166,287,000 $ 164,887,000