Accounts Receivable - Rollforward of Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 1,816	$ 1,881
Provision for bad debts	1,486	628	$ 402
Accounts written off, net of recoveries	(1,081)	(693)
Balance at end of period	$ 2,221	$ 1,816	$ 1,881