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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Earnings Per Share [Abstract]      
Net income from continuing operations attributable to shareholders $ 590,212 $ 6,156 $ 445,256
Amounts allocated to participating securities (2,413) (639) (1,040)
Net income from continuing operations attributable to common shareholders $ 587,799 $ 5,517 $ 444,216
Basic weighted average common shares (in shares) 186,832 196,701 205,372
Potential dilutive shares (in shares) 1,945 1,407 1,352
Dilutive weighted average common shares (in shares) 188,777 198,108 206,724
Earnings per share from continuing operations attributable to common shareholders:      
Basic (in usd per share) $ 3.15 $ 0.03 $ 2.16
Diluted (in usd per share) $ 3.11 $ 0.03 $ 2.15
Antidilutive securities excluded from computation of earnings per share (in shares) 800 900 400