Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2018 |
Dec. 31, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
Reconciliation of Unrecognized Tax Benefits | |||||
Beginning balance | $ 6,530 | $ 6,530 | $ 6,058 | $ 6,058 | |
Increase for tax positions taken during a prior period | 963 | 0 | 0 | ||
Increase for tax positions taken during the current period | 0 | 472 | 0 | ||
Decrease for tax positions as a result of the lapse of the statute of limitations | $ (3,300) | $ (1,600) | (4,402) | 0 | 0 |
Ending balance | $ 3,091 | $ 6,530 | $ 6,058 |