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Income Taxes (Schedule Of Income Tax Reconciliation By Applying Federal Income Tax Rate) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Income Taxes [Abstract]    
U.S. Income Before Income Taxes $ 213,398 $ 283,993
Income Tax Expense, Computed at U.S. Federal Statutory Rate of 35% 74,689 99,398
Increase (Reduction) in Taxes Resulting from State Income Taxes 12,471 14,683
Increase (Reduction) in Taxes Resulting From Miscellaneous (1,853) (4,242)
Total Income Taxes $ 85,307 $ 109,839
Federal Statutory Rate 35.00%