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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, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Income Tax Disclosure [Abstract]                      
Document Fiscal Year Focus                 2017    
Domestic                 $ 535,378 $ 513,746 $ 682,744
Foreign                 93,909 55,733 60,061
Income from continuing operations before income taxes $ 1,211,903 $ (150,598) $ (228,469) $ (203,549) $ 1,140,807 $ (146,500) $ (237,719) $ (187,109) $ 629,287 $ 569,479 $ 742,805