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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Operating Loss Carryforwards [Line Items] |  |  |
Change in valuation allowance |  | $ (3,309) | $ (147)
Valuation allowance | $ 4,399 | 4,399 | 1,095
Alternative minimum tax | 95 | 95 |
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 | 105
Portion of liability related to uncertain tax position which, if recognized, would impact the effective tax rate | 69 | 69 |
Accrued (reversal of accrued) interest | 21 | 21 |
Interest and penalties from continuing operations |  | 3 |
Undistributed earnings of foreign subsidiaries | 9,766 | 9,766 |
Revenue commissioners, Ireland | Subsidiaries |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Non US tax loss carryforward | 6,132 | 6,132 |
Foreign tax authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Non US tax loss carryforward | 575 | 575 |
Domestic tax authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Change in valuation allowance | 3,259 |  |
Deferred tax assets, net |  |  | $ 838
Valuation allowance | 3,902 | 3,902 |
Non US tax loss carryforward | 520 | 520 |
State tax authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Non US tax loss carryforward | 165 | 165 |
State and local jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Non US tax loss carryforward | $ 10,583 | $ 10,583 |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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