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Income Taxes (Schedule Of Income Tax Reconciliation By Applying Federal Income Tax Rate) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Abstract]    
U.S. Income Before Income Taxes $ 101,279 $ 96,421
Income Tax Expense, Computed at U.S. Federal Statutory Rate of 35% 35,448 33,747
Increase (Reduction) in Taxes Resulting from State Income Taxes 6,106 5,275
Increase (Reduction) in Taxes Resulting From Miscellaneous (974) (1,144)
Total Income Taxes $ 40,580 $ 37,878
Federal Statutory Rate 35.00% 35.00%