Revenue Recognition - Contract Balances (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Major Customer [Line Items]
Revenue recognized related to deferred revenue and customer loyalty program	$ 15,700
Contract liabilities	35,141	$ 30,574
Change	4,567
Contract assets	6,600		$ 7,100
Amortization expense related to contract assets	4,000
Deferred revenue.
Revenue, Major Customer [Line Items]
Contract liabilities	17,122	15,850
Change	1,272
Customer loyalty program
Revenue, Major Customer [Line Items]
Contract liabilities	18,019	$ 14,724
Change	$ 3,295

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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