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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022
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 | 17 |
Interest and penalties from continuing operations | 1 |
Undistributed earnings of foreign subsidiaries | 731 |
Revenue commissioners, Ireland | Subsidiaries |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward | 5,988 |
Foreign tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 1,724 |
Domestic tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 33,205 |
Interest expense carryforward | 1,001 |
Tax credit carryforward amount subject to expiration | 9,107 |
Tax credit carryforward amount not subject to expiration | 24,098 |
Domestic tax authority | General Business Tax Credit Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 1,705 |
State and local jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward | 28,561 |
Tax credit carryforward | $ 178 |

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