Significant Accounting Policies - Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016
Defined benefit plan
Beginning balance	$ (2,414)	$ 0	$ 0
Other comprehensive income (loss)	384	(2,414)	0
Ending balance	(2,030)	(2,414)	0
Other
Beginning balance	830	701	701
Other comprehensive income	0	129	0
Ending balance	830	830	701
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(1,294)	653	163
Other comprehensive income (loss)	94	(1,947)	490
Ending balance	(1,200)	(1,294)	653
Foreign currency cash flow hedges
Derivatives
Beginning balance	290	0	0
Other comprehensive income (loss)	(290)	290	0
Ending balance	0	290	0
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income (loss)	(290)	290
Interest rate cap
Derivatives
Beginning balance	0	(48)	(538)
Other comprehensive income (loss)	0	48	490
Ending balance	$ 0	$ 0	$ (48)