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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Apr. 30, 2019
Apr. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Repurchase and retirement of common shares, value $ 184,838  
Average price (usd per share) $ 23.51 $ 22.61
Repurchase and retirement of common shares   $ 317,020
Common Stock    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Repurchase and retirement of common shares, shares 7,862  
Repurchase and retirement of common shares, value $ 79  
Repurchase and retirement of common shares, shares   14,020
Repurchase and retirement of common shares   $ 140