Net Income Per Share - Anti-Dilutive Securities Excluded from Diluted Net Income per Share (Detail) - shares	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 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	3,124,779	7,853,373	535,306
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	2,895,471	7,243,697	522,390
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	229,308	609,676	12,916