Leases - Supplemental Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Leases
Operating lease costs (Topic 842)	$ 5,800
Rent expense (Topic 840)		$ 6,000	$ 5,500
Balance Sheet Information
Operating lease right-of-use assets	16,086
Operating lease liabilities	17,894
Cash Flow Information
Cash paid for operating lease liabilities	6,023
Right-of-use assets obtained in exchange for operating lease obligations	$ 2,631
Operating Lease Information
Weighted-average remaining lease term	4 years 6 months
Weighted-average discount rate	5.26%