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Share-Based Compensation Plans - Narrative (Details) - USD ($)
May 01, 2006
Oct. 31, 2019
Mar. 31, 2018
Mar. 31, 2016
2006 Equity Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares)     13,475,265  
Number of shares available for grant (in shares)   2,793,556    
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      
Number of shares unissued (in shares)   705,213    
Holding period for shares purchased in program 6 months