Fair Value Measurements-non-recurring (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
Fair value measurements
Carrying value of long-lived assets held and used	$ 356	$ 270	$ 100
Fair value of long-lived assets held and used	100	100	5
Impairment charge	281	216	$ 140
Nonrecurring basis | Level 3
Fair value measurements
Fair value of long-lived assets held and used	$ 75	$ 54