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Commitments and Contingencies Sales Return Liability (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 03, 2015
Sep. 27, 2014
Sales return liability [Roll Forward]    
Balance at beginning of year $ 15,262 $ 9,433
Additions that reduce net sales 67,944 55,047
Deductions from reserves (63,893) (50,074)
Balance at end of period $ 19,313 $ 14,406