Income Taxes (Schedule Of Income Tax Reconciliation By Applying Federal Income Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. Income (Loss) Before Income Taxes	$ 145,297	$ (333,546)
Income Tax Expense (Benefit), Computed at U.S. Federal Statutory Rate of 35%	50,854	(116,741)
State Income Taxes (Benefit)	7,650	(24,972)
Miscellaneous	(2,115)	(2,724)
Total Income Taxes	$ 56,389	$ (144,437)
Federal Statutory Rate	35.00%	35.00%