Income Taxes - Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	$ (4,826)	$ (14,247)	$ 661
State	607	(867)	375
Foreign	4,627	15,484	3,721
Total current income tax provision	408	370	4,757
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	(815)	(11,469)	(11,833)
State	(180)	(2,283)	(1,976)
Foreign	1,937	(6,718)	(4,878)
Total deferred income tax provision (benefit)	942	(20,470)	(18,687)
Income tax benefit	$ 1,350	$ (20,100)	$ (13,930)