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Revenue Recognition - Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019	Dec. 29, 2019
Revenue disaggregation
Revenue recognized related to deferred revenue and customer loyalty program	$ 8,400	$ 8,400	$ 16,300	$ 15,800
Contract liabilities	31,194		31,194		$ 32,395
Change			(1,201)
Contract assets	4,900		4,900		6,000
Amortization expense related to contract assets	700		1,600
Deferred revenue.
Revenue disaggregation
Contract liabilities	18,925		18,925		20,346
Change			(1,421)
Customer loyalty program
Revenue disaggregation
Contract liabilities	$ 12,269		12,269		$ 12,049
Change			$ 220