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Deferred Costs and Other Contract Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]          
Deferred cost of goods sold $ 102,565   $ 102,565   $ 93,261
Prepaid contract incentives 5,631   5,631   6,115
Deferred commissions 5,395   5,395   5,613
Unbilled contract receivables 3,395   3,395   4,267
Deferred costs and other contract assets 116,986   116,986   $ 109,256
Amortization of Other Deferred Charges 400 $ 500 800 $ 900  
Amortization of Deferred Sales Commissions 500 600 1,100 1,200  
Deferred Cost of Goods Sold, Amortization $ 7,200 $ 7,100 $ 14,800 $ 13,900