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Share-Based Compensation Plans - Narrative (Details) - USD ($)
12 Months Ended
Oct. 31, 2020
Mar. 31, 2018
Mar. 31, 2016
May 01, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Holding period for shares purchased in program 6 months      
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) 2,086,078      
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) 599,159