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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