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Income Taxes - (Narratives) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]      
Income tax benefit $ 7,280 $ 3,653 $ 1,777
Effective rate of income tax (percentage) 14.00% 15.60% 12.40%
Increase in deferred tax assets   $ 13,500  
Operating loss carryforward, foreign   38,000  
Deferred tax asset valuation allowances $ 18,533 $ 4,987