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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Stock-based Compensation [Abstract]    
Share-based compensation expense $ 4,314 $ 4,604
Restricted Stock [Member]    
Restricted Stock [Abstract]    
Awards granted (in shares) 358 500
Weighted average fair value of grant (in dollars per share) $ 38.88 $ 45.31
Performance-based Stock Awards [Member]    
Stock-based Compensation [Abstract]    
Period for achievement of performance-based targets 3 years