Net Income Per Share - Anti-Dilutive Securities Excluded from Diluted Net Income per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Nov. 02, 2019	Nov. 03, 2018	Nov. 02, 2019	Nov. 03, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options and restricted stock units were excluded from calculation of diluted net earnings share	190,766	348,423	457,300	351,627
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	190,766	348,423	457,300	348,127
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				3,500