Net Income (Loss) Per Share - Anti-Dilutive Securities Excluded from Diluted Net Income (Loss) per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 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	9,835,587	8,510,247	9,835,587	9,965,459
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	8,997,210	7,498,345	8,997,210	8,782,871
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	838,377	1,011,902	838,377	1,182,588