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Income Taxes - Components of Income Taxes (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Federal:                      
Current                 $ 79,841 $ 70,797 $ 66,756
Deferred                 3,244 10,591 10,355
Federal                 83,085 81,388 77,111
State:                      
Current                 6,636 4,987 5,213
Deferred                 (518) 1,189 787
State                 6,118 6,176 6,000
Total                      
Current                 86,477 75,784 71,969
Deferred                 2,726 11,780 11,142
Income taxes $ 23,647 $ 21,727 $ 22,458 $ 21,371 $ 22,568 $ 21,092 $ 21,511 $ 22,393 $ 89,203 $ 87,564 $ 83,111