Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Apr. 30, 2016	Jan. 30, 2016
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	180,000,000	180,000,000
Common stock, shares issued	40,900,613	40,878,163
Common stock, shares outstanding	40,605,725	40,583,275
Treasury stock, shares	294,888	294,888