Income Taxes - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Tax Credit Carryforward
Deferred tax assets, valuation allowance	$ 24,110	$ 14,590
Unrecognized Tax Benefits	6,716	8,032	$ 11,410	$ 8,032
Unrecognized tax benefits that if recognized would reduce the effective tax rate	6,700
Accrued interest	1,300
Accrued penalties related to uncertain tax positions	800
Benefit for interest and penalties	200
Remeasurement of deferred taxes	(17,150)	0	$ 0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	$ 976
Decrease in Unrecognized Tax Benefits is Reasonably Possible	500
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	7,600
Deferred Tax Assets, Tax Credit Carryforwards, Research	7,100
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	8,800
Foreign
Tax Credit Carryforward
Net operating loss carryforwards	52,100
Research and development tax credit carryforward | Foreign
Tax Credit Carryforward
Tax credit carryforward	3,600
Research and development tax credit carryforward | State and Local Jurisdiction [Member]
Tax Credit Carryforward
Tax credit carryforward	$ 6,600