Income Taxes - Textual (Details)	12 Months Ended
	Sep. 30, 2023 USD ($)
Operating Loss Carryforwards [Line Items]
Undistributed earnings	$ 6,400,000
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, utilized amount	84,900,000
Net operating loss carryforwards	0
Federal | Research tax credit carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	54,400,000
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	25,400,000
State | Research tax credit carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	47,000,000
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 46,900,000