Significant Accounting Policies - Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 29, 2017	Jan. 31, 2016	Jan. 25, 2015
Defined benefit plan
Beginning balance	$ 0	$ 0	$ 0
Other comprehensive income (loss)	(2,414)	0	0
Ending balance	(2,414)	0	0
Derivatives
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	129	0	(1)
Other
Beginning balance	700	700	701
Ending balance	829	700	700
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	653	163	253
Total other comprehensive (loss) income - Net	(1,947)	490	(90)
Ending balance	(1,294)	653	163
Foreign currency cash flow hedges
Derivatives
Beginning balance	0	0	0
Other comprehensive income (loss)	290	0	0
Ending balance	290	0	0
Interest rate cap
Derivatives
Beginning balance	(47)	(537)	(448)
Other comprehensive income (loss)	48	490	(89)
Ending balance	$ 1	$ (47)	$ (537)