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Income Taxes - Provision (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Current tax provision (benefit):      
U.S. Federal $ 0 $ 0 $ 0
State 293 382 453
Foreign 847 313 611
Current income tax expense 1,140 695 1,064
Deferred tax provision (benefit):      
U.S. Federal (23,315) 74 103
State (1,252) (27) (31)
Foreign 57 59 64
Total deferred tax (benefit) expense (24,510) 106 136
Total (benefit) provision $ (23,370) $ 801 $ 1,200