Restructuring - Restructuring Reserve Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016
Restructuring Reserve [Roll Forward]
Beginning balance	$ 13	$ 342	$ 282
Charges	6,301	2,282	4,526
Cash payments	(1,565)	(2,611)	(4,466)
Reclassifications			0
Ending balance	4,749	13	342
One-time employee termination benefits
Restructuring Reserve [Roll Forward]
Beginning balance	13	342	282
Charges	5,615	2,282	4,526
Cash payments	(1,565)	(2,611)	(4,466)
Reclassifications			0
Ending balance	4,063	13	342
Contract commitments
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	0
Charges	686	0	0
Cash payments	0	0	0
Reclassifications			0
Ending balance	$ 686	$ 0	$ 0