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)

v3.3.1.900
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, 2016
Jan. 31, 2015
Jan. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive potentially outstanding common shares 1,674 1,814 1,386
Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive potentially outstanding common shares 1,493 1,586 913
Restricted Stock Units [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive potentially outstanding common shares 145 217 473
Deferred Stock Units [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive potentially outstanding common shares 31 11  
Performance Stock Units (PSUs) [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive potentially outstanding common shares 5