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Income Taxes - Foreign and Domestic Income Components (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]      
Domestic $ 29,001 $ 29,740 $ (17)
Foreign 28,075 13,499 380
Income from continuing operations before income taxes $ 57,076 $ 43,239 $ 363