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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020
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 | 15 |
Interest and penalties from continuing operations | 1 |
Undistributed earnings of foreign subsidiaries | 500 |
Revenue commissioners, Ireland | Subsidiaries |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward | 5,585 |
Foreign tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 1,724 |
Domestic tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 14,588 |
Tax credit carryforward amount subject to expiration | 9,107 |
Tax credit carryforward amount not subject to expiration | 5,481 |
Domestic tax authority | General Business Tax Credit Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 1,337 |
State tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 178 |
State and local jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward | $ 21,763 |

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- Definition The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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