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Income Tax Expense (Total income tax expense (benefit)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income tax expense from Continuing Operations $ 26,450 $ 22,538 $ 19,785
Income tax expense from Discontinued Operations 0 0 390
Total income tax expense $ 26,450 $ 22,538 $ 20,175