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Income Taxes (Schedule Of Components Of Income From Continuing Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Income Tax Disclosure [Abstract]                      
Document Fiscal Year Focus                 2018    
Domestic                 $ 547,101 $ 535,378 $ 513,746
Foreign                 121,631 93,909 55,733
Income from continuing operations before income taxes $ 1,231,021 $ (120,805) $ (236,265) $ (205,219) $ 1,211,903 $ (150,598) $ (228,469) $ (203,549) $ 668,732 $ 629,287 $ 569,479