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Stock-Based Compensation - 2012 Stock Option Plan and 2012 Stock Incentive Plan - Additional Information (Detail) - 2012 Stock Option Plan and 2012 Stock Incentive Plan [Member]
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 30, 2016
USD ($)
$ / shares
shares
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding shares | shares 7,590,257
Options outstanding, weighted-average exercise price per share | $ / shares $ 53.51
Numbers of options vested | shares 4,920,029
Vested weighted-average exercise price per share | $ / shares $ 50.06
Aggregate intrinsic value of options outstanding $ 12.8
Aggregate intrinsic value of options vested or expected to vest 12.8
Aggregate intrinsic value of options exercisable $ 12.0
Weighted-average remaining contractual life of options exercisable 6 years 8 months 23 days
Unrecognized compensation expense related to unvested options $ 47.7
Unrecognized compensation expense with weighted-average period 4 years 1 month 21 days
Restricted Stock And Restricted Stock Unit Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding shares | shares 1,233,282
Unrecognized compensation expense related to unvested options $ 51.0
Unrecognized compensation expense with weighted-average period 4 years 15 days
Restricted stock awards outstanding with weighted-average grant date fair value per share | $ / shares $ 61.02
Vested restricted stock awards | shares 14,088
Vested weighted-average exercise price per share | $ / shares $ 67.27