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)

v3.8.0.1
Net Loss Per Share - Schedule of Anti-dilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive potentially outstanding common shares 2,452 2,629 2,607 2,285
Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive potentially outstanding common shares 1,588 1,756 1,676 1,443
Restricted Stock Units [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive potentially outstanding common shares 483 514 349 472
Deferred Stock Units [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive potentially outstanding common shares 42 28 88 55
Performance Stock Units (PSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive potentially outstanding common shares 339 331 494 315