Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Net Loss Per Share - Schedule of Anti-dilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares
shares in Thousands
 3 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 3,246 1,897
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 1,698 927
Restricted Stock Units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 1,126 896
Deferred Stock Units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 106 74
Performance Stock Units (PSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 316