Income Taxes (Summary of Valuation Allowance) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
Valuation Allowance [Line Items] | |||
Balance at beginning of period | $ 38,407 | $ 32,828 | $ 401 |
Additions (reductions) to income tax expense | (5,555) | 6,192 | 34,184 |
Write-offs | (9,740) | (613) | (1,757) |
Balance at End of Period | 23,112 | $ 38,407 | $ 32,828 |
deferred tax asset related to asc 606 adoption [Member] | |||
Valuation Allowance [Line Items] | |||
Write-offs | $ (9,600) |