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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016
Operating Loss Carryforwards [Line Items] |  |
Alternative minimum tax | $ 28 |
Portion of tax loss carryforward offset by unrealized stock compensation deduction | 5 |
Liability for uncertain tax positions, excluding any related interest and penalties | 69 | $ 69
Portion of liability related to uncertain tax position which, if recognized, would impact the effective tax rate | 69 |
Accrued (reversal of accrued) interest | 24 |
Interest and penalties from continuing operations | 3 |
Undistributed earnings of foreign subsidiaries | 11,427 |
Revenue commissioners, Ireland | Subsidiaries |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward | 5,473 |
Foreign tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 602 |
Domestic tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 13,561 |
State tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 165 |
State and local jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforward | 23,848 |
General Business Tax Credit Carryforward | Domestic tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | $ 758 |

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