Revenue from Contracts with Customers Change in Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Contract assets increase (decrease)
Contract assets recognized	$ 1,313	$ 2,100
Reclassification of contract assets to contra-revenue	(473)	(483)
Contract asset impairment		(1,550)
Net change	840	67
Contract liabilities (increase) decrease
Contract liabilities recognized and recorded to contra-revenue as a result of performance obligations satisfied	(147,830)	(127,454)
Contract liabilities paid	138,015	132,909
Cash received in advance and not recognized as revenue	(67,938)	(54,167)
Reclassification of cash received in advance to revenue as a result of performance obligations satisfied	67,639	58,304
Impact of business combination		77
Net change	$ (10,114)	$ 9,669