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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Earnings Per Share [Abstract]      
Net income from continuing operations attributable to shareholders $ 6,156 $ 445,256 $ 626,909
Amounts allocated to participating securities (639) (1,040) (1,492)
Net income from continuing operations attributable to common shareholders $ 5,517 $ 444,216 $ 625,417
Basic weighted average common shares (in shares) 196,701 205,372 208,824
Potential dilutive shares (in shares) 1,407 1,352 1,389
Dilutive weighted average common shares (in shares) 198,108 206,724 210,213
Earnings per share from continuing operations attributable to common shareholders:      
Basic (in usd per share) $ 0.03 $ 2.16 $ 2.99
Diluted (in usd per share) $ 0.03 $ 2.15 $ 2.98
Antidilutive securities excluded from computation of earnings per share (in shares) 900 400 600