Net Income Per Share - Anti-Dilutive Securities Excluded from Diluted Net Income per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Aug. 03, 2019	Aug. 04, 2018	Aug. 03, 2019	Aug. 04, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options and restricted stock units were excluded from calculation of diluted net earnings share	717,627	209,441	590,567	353,228
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options and restricted stock units were excluded from calculation of diluted net earnings share	717,627	209,441	590,567	347,978
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options and restricted stock units were excluded from calculation of diluted net earnings share				5,250