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Income Taxes (Schedule Of Components Of Income From Continuing Operations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Income Tax Disclosure [Abstract]      
Domestic $ 56,121 $ 389,319 $ 547,101
Foreign (59,495) 155,841 121,631
Income (loss) from continuing operations before income taxes (benefit) $ (3,374) $ 545,160 $ 668,732