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Income Taxes (Schedule Of Income Tax Reconciliation By Applying Federal Income Tax Rate) (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
U.S. Income (Loss) Before Income Taxes $ 287,508 $ (597,350)
Income Tax Expense (Benefit), Computed at U.S. Federal Statutory Rate of 35% 100,628 (209,073)
State Income Taxes (Benefit) 15,302 (45,756)
Miscellaneous (6,613) (5,725)
Total Income Taxes $ 109,317 $ (260,554)
Federal Statutory Rate 35.00% 35.00%