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Deferred Costs and Other Contract Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]          
Deferred cost of goods sold $ 105,664   $ 105,664   $ 93,261
Prepaid contract incentives 5,485   5,485   6,115
Deferred commissions 4,950   4,950   5,613
Unbilled contract receivables 3,424   3,424   4,267
Deferred costs and other contract assets 119,523   119,523   $ 109,256
Deferred Cost of Goods Sold, Amortization 7,400 $ 7,600 22,200 $ 21,500  
Amortization of Other Deferred Charges 500 600 1,300 1,500  
Amortization of Deferred Sales Commissions $ 500 $ 600 $ 1,600 $ 1,900