Net Income (Loss) Per Share - Anti-Dilutive Securities Excluded from Diluted Net Income per Share (Detail) - shares	3 Months Ended
	May 02, 2020	May 04, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options and restricted stock units were excluded from calculation of diluted net earnings share	5,202,490	463,506
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	4,436,083	463,506
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	177,312
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options and restricted stock units were excluded from calculation of diluted net earnings share	589,095