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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Earnings Per Share [Abstract]      
Net income from continuing operations attributable to shareholders $ 445,256 $ 626,909 $ 420,917
Amounts allocated to participating securities (1,040) (1,492) (1,005)
Net income from continuing operations attributable to common shareholders $ 444,216 $ 625,417 $ 419,912
Basic weighted average common shares (in shares) 205,372 208,824 212,809
Potential dilutive shares (in shares) 1,352 1,389 1,286
Dilutive weighted average common shares (in shares) 206,724 210,213 214,095
Basic (in usd per share) $ 2.16 $ 2.99 $ 1.97
Diluted (in usd per share) $ 2.15 $ 2.98 $ 1.96
Antidilutive securities excluded from computation of earnings per share (in shares) 400 600 300