Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Schedule of Anti-dilutive Securities Excluded from Computation of Loss Per Share (Detail)

v3.20.1
Significant Accounting Policies - Schedule of Anti-dilutive Securities Excluded from Computation of Loss Per Share (Detail) - shares
shares in Thousands
3 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 905 3,531
Stock Options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 766 2,937
Restricted Stock Units [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 58 291
Deferred Stock Units [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 81 188
Performance Stock Units (PSUs) [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares   115