Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Loss Carryforwards [Line Items]
Liability for uncertain tax positions, excluding any related interest and penalties	$ 22	$ 22
Liability for uncertain tax position, would impact the effective tax rate, if recognized	22
Accrued interest	16
Interest and penalties from continuing operations	1
Undistributed earnings of foreign subsidiaries	2,062
Revenue commissioners, Ireland | Subsidiaries
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	7,190
Foreign tax authority
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	1,724
Domestic tax authority
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	25,038
Interest expense carryforward	466
Tax credit carryforward amount subject to expiration	9,107
Tax credit carryforward amount not subject to expiration	15,931
Domestic tax authority | General Business Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	1,506
State tax authority
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	178
State and local jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	$ 23,994