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Deferred Costs and Other Contract Assets Deferred Costs and Other Contract Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Dec. 29, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Prepaid contract incentives $ 6,487   $ 7,036
Deferred commissions 5,158   5,085
Unbilled contract receivables 3,432   5,567
Equipment leased to customers, net(1) 522   108,417
Total contract-related assets 15,599   126,105
Deferred Cost of Goods Sold, Amortization 200 $ 7,300  
Deferred Cost of Goods Sold, Accumulated Amortization 500   $ 103,100
Amortization of Other Deferred Charges 500 400  
Amortization of Deferred Sales Commissions $ 500 $ 600