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Deferred Costs and Other Contract Assets Deferred Costs and Other Contract Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Dec. 29, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]          
Prepaid contract incentives $ 5,862   $ 5,862   $ 7,036
Deferred commissions 5,136   5,136   5,085
Unbilled contract receivables 2,358   2,358   5,567
Equipment leased to customers, net(1) 642   642   108,417
Total deferred costs and other contract assets 13,998   13,998   126,105
Deferred Cost of Goods Sold, Amortization 400 $ 7,200 600 $ 14,800  
Deferred Cost of Goods Sold, Accumulated Amortization 900   900   $ 103,100
Amortization of Other Deferred Charges 400 400 900 800  
Amortization of Deferred Sales Commissions $ 500 $ 500 $ 1,000 $ 1,100