Annual report pursuant to Section 13 and 15(d)

Net Income (Loss) Per Share - Schedule of Anti-dilutive Securities Excluded from Computation of Earnings Per Share (Detail)

v3.19.1
Net Income (Loss) Per Share - Schedule of Anti-dilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares
shares in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 4,094 1,991
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 3,245 1,522
Restricted Stock Units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 264 159
Deferred Stock Units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 18 13
Performance Stock Units (PSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 567 297