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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019
Operating Loss Carryforwards [Line Items] |  |
Valuation allowance net deferred tax assets | $ 5,329 | $ 7,557
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 | 14 |
Interest and penalties from continuing operations | 1 |
Undistributed earnings of foreign subsidiaries | 485 |
Revenue commissioners, Ireland | Subsidiaries |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward | 6,141 |
Foreign tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 1,724 |
Domestic tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 12,943 |
Tax credit carryforward amount subject to expiration | 9,622 |
Tax credit carryforward amount not subject to expiration | 3,321 |
Domestic tax authority | General Business Tax Credit Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 1,182 |
State tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 178 |
State and local jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward | $ 25,782 |

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