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Share-Based Compensation Plans - Narrative (Details) - USD ($)
May 01, 2006
Oct. 31, 2017
May 01, 2016
Mar. 31, 2016
2006 Equity Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares)   11,679,265    
Number of shares available for grant (in shares)   1,787,954    
2004 Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares)       4,000,000
Fair value percentage of common stock price     95.00%  
Employee contribution percentage     10.00%  
Maximum annual employee contribution     $ 25,000  
Holding period for shares purchased in program 6 months      
Number of shares unissued (in shares)   971,412