Net Income (Loss) Per Share - Anti-Dilutive Securities Excluded from Diluted Net Income (Loss) per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options and restricted stock units were excluded from calculation of diluted net earnings share	2,350,826	8,887,982	4,007,228	9,746,480
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options and restricted stock units were excluded from calculation of diluted net earnings share	2,222,103	7,995,703	3,701,484	8,594,487
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options and restricted stock units were excluded from calculation of diluted net earnings share	128,723	892,279	305,744	1,151,993