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Commitments and Contingencies (Undiscounted Reserves to the Discounted Reserves) (Details) - USD ($)
$ in Thousands
Dec. 27, 2015
Dec. 28, 2014
Insurance [Line Items]    
Discount rate 1.08% 0.83%
Undiscounted reserves $ 63,791 $ 64,157
Discount (2,318) (1,780)
Self insurance reserve 61,473 62,377
Accrued and other current liabilities [Member]    
Insurance [Line Items]    
Self insurance reserve, current 20,824 19,455
Other long-term liabilities, net [Member]    
Insurance [Line Items]    
Self insurance reserve, noncurrent $ 40,649 $ 42,922