Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Payables and Accruals [Abstract]
Trade accounts payable	$ 35,477	$ 35,350
Deferred rent	3,835	3,834
Liability for non-cancelable contracts	3,596	4,531
Other accrued expenses	12,366	10,690
Total accounts payable and accrued expenses	$ 55,274	$ 54,405