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Income Taxes - Components of Income Taxes (Benefit) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Federal: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | $ 66,756 | $ 57,047 |
Deferred |  |  |  |  |  |  |  |  | 10,355 | 15,589 |
Federal |  |  |  |  |  |  |  |  | 77,111 | 72,636 |
State: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 5,213 | 4,091 |
Deferred |  |  |  |  |  |  |  |  | 787 | 1,001 |
State |  |  |  |  |  |  |  |  | 6,000 | 5,092 |
Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 71,969 | 61,138 | 88,373
Deferred |  |  |  |  |  |  |  |  | 11,142 | 16,590 | (25,855)
Income taxes | $ 24,293 | $ 21,003 | $ 17,924 | $ 19,891 | $ 19,987 | $ 19,778 | $ 19,165 | $ 18,798 | $ 83,111 | $ 77,728 | $ 62,518

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