Annual report pursuant to Section 13 and 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
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive potentially outstanding common shares 2,251 1,674 1,814
Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive potentially outstanding common shares 1,415 1,493 1,586
Restricted Stock Units [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive potentially outstanding common shares 448 145 217
Deferred Stock Units [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive potentially outstanding common shares 70 31 11
Performance Stock Units (PSUs) [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive potentially outstanding common shares 318 5