Leases - The Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 26, 2020	Jul. 28, 2019	Jul. 26, 2020	Jul. 28, 2019
Leases [Abstract]
Operating lease cost	$ 1,178	$ 1,214	$ 2,355	$ 2,428
Short-term lease cost	0	83	0	161
Sublease income	(34)	(32)	(67)	(65)
Total lease cost	$ 1,144	$ 1,265	$ 2,288	$ 2,524