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)

v3.20.2
Significant Accounting Policies - Schedule of Anti-dilutive Securities Excluded from Computation of Loss Per Share (Detail) - shares
shares in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive potentially outstanding common shares 3,297 1,011 1,212 3,263
Stock Options [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive potentially outstanding common shares 2,643 1,011 1,072 2,820
Restricted Stock Units [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive potentially outstanding common shares 341   58 130
Deferred Stock Units [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive potentially outstanding common shares 313   82 201
Performance Stock Units (PSUs) [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive potentially outstanding common shares       112