Restructuring - Restructuring Reserve Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 29, 2017	Jan. 31, 2016	Jan. 25, 2015
Restructuring Reserve [Roll Forward]
Beginning balance	$ 342	$ 282	$ 2,632
Charges	2,282	4,526	1,285
Cash payments	(2,611)	(4,466)	(3,520)
Reclassifications			(115)
Ending balance	13	342	282
One-time employee termination benefits
Restructuring Reserve [Roll Forward]
Beginning balance	342	282	1,387
Charges			662
Cash payments	(2,611)	(4,466)	(1,767)
Reclassifications			0
Ending balance	13	342	282
Contract commitments
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	1,245
Charges	0	0	623
Cash payments	0	0	(1,753)
Reclassifications			(115)
Ending balance	$ 0	$ 0	$ 0