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Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Current:      
Federal $ 81,127 $ 23,923 $ 48,327
State 6,067 3,108 5,752
Foreign 9,689 18,343 16,594
Deferred:      
Federal (40,801) 19,236 (4,378)
State (9,054) 751 (2,966)
Foreign (1,380) (5,864) (1,929)
Income tax expense $ 45,648 $ 59,497 $ 61,400