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Share-Based Compensation Plans - Narrative (Details) - USD ($)
May 01, 2006
Oct. 31, 2018
Mar. 31, 2018
May 01, 2016
Mar. 31, 2016
May 02, 2006
2006 Equity Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares)     13,475,265     11,679,265
Number of shares available for grant (in shares)   3,288,635        
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)   827,304        
Holding period for shares purchased in program 6 months