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Summary of Significant Accounting Policies (Accounts Payable) (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Trade accounts payable $ 235,577 $ 201,810
Compensation 32,582 47,280
Profit sharing and retirement expense 30,884 32,335
Marketing expenses 41,751 41,963
Freight 13,121 14,251
Other accrued expenses 96,213 87,407
Accounts payable and accrued expenses $ 450,128 $ 425,046