Interest Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Interest expense, net
Interest expense	$ 375	$ 113	$ 1,155	$ 318
Interest income	(1)	(3)	(8)	(9)
Interest expense, net	$ 374	$ 110	$ 1,147	$ 309