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Share-Based Compensation - Narrative (Details) - Market Performance-based RSUs
3 Months Ended
Apr. 30, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Equity awards granted | shares 215,857
Description of award vesting rights one-third of the awards vesting each performance period
Percent of target expected to be achieved 99.00%
Performance Period One  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance period 1 year
Grant date fair value per unit $ 38.01
Performance Period Two  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance period 2 years
Grant date fair value per unit $ 39.76
Performance Period Three  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance period 3 years
Grant date fair value per unit $ 40.89