Earnings Per Share - Components of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 29, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015
Numerator:
Net income	$ 8,780	$ 10,268	$ 16,307	$ 11,847
Denominator:
Weighted-average number of common shares (basic)	36,557	38,057	37,045	39,085
Dilutive effect of stock-based awards	125	42	128	19
Weighted-average number of common shares (diluted)	36,682	38,099	37,173	39,104
Earnings per share:
Basic (in dollars per share)	$ 0.24	$ 0.27	$ 0.44	$ 0.30
Diluted (in dollars per share)	$ 0.24	$ 0.27	$ 0.44	$ 0.30