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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |
Blended tax rate |  | 24.50%
Tax act, transition tax |  | $ 240,000
Operating Loss Carryforwards [Line Items] |  |
Liability for uncertain tax positions, excluding any related interest and penalties | $ 22,000 | $ 53,000
Portion of liability related to uncertain tax position which, if recognized, would impact the effective tax rate | 22,000 |
Accrued (reversal of accrued) interest | 13,000 |
Interest and penalties from continuing operations | 800 |
Undistributed earnings of foreign subsidiaries | 127,000 |
Revenue commissioners, Ireland | Subsidiaries |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward | 6,618,000 |
Foreign tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 1,724,000 |
Domestic tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 19,358,000 |
Tax credit carryforward amount subject to expiration | 12,625,000 |
Tax credit carryforward amount not subject to expiration | 6,733,000 |
State tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 178,000 |
State and local jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward | 33,253,000 |
General Business Tax Credit Carryforward | Domestic tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | $ 1,054,000 |

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