CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (1,142)	$ 4,041
Foreign currency translation adjustments	2	2
Comprehensive income (loss)	$ (1,140)	$ 4,043