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Income Taxes - Components of Income Taxes (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Federal: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | $ 87,804 | $ 57,173 | $ 79,841
Deferred |  |  |  |  |  |  |  |  | (10,142) | 21,961 | 3,244
Federal |  |  |  |  |  |  |  |  | 77,662 | 79,134 | 83,085
State: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 4,991 | 3,600 | 6,636
Deferred |  |  |  |  |  |  |  |  | 31 | 1,351 | (518)
State |  |  |  |  |  |  |  |  | 5,022 | 4,951 | 6,118
Total |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 92,795 | 60,773 | 86,477
Deferred |  |  |  |  |  |  |  |  | (10,111) | 23,312 | 2,726
Income taxes | $ 20,865 | $ 21,239 | $ 20,721 | $ 19,859 | $ 21,115 | $ 22,154 | $ 21,499 | $ 19,317 | $ 82,684 | $ 84,085 | $ 89,203

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