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Deferred Costs and Other Contract Assets Deferred Costs and Other Contract Assets - (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Accrued customer reimbursements $ 16,194 $ 16,896
Deferred cost of goods sold 109,398 93,261
Prepaid contract incentives 7,036 6,115
Unbilled contract receivables 5,567 4,267
Deferred commissions 5,085 5,613
Deferred Costs and Other Assets 127,086 109,256
Deferred Cost of Goods Sold, Amortization 30,000 27,500
Amortization of Other Deferred Charges 1,700 2,000
Amortization of Deferred Sales Commissions $ 2,200 $ 2,500