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Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Valuation Allowance, Deferred Tax Asset, Change in Amount | $ (468) |
Income tax expense | $ 1,287 | $ 996
Effective Income Tax Rate, Continuing Operations | 33.90% | 27.70%
Deferred Tax Assets, Valuation Allowance | $ 2,712 | $ 3,180
Deferred Tax Assets, Other Tax Carryforwards | 55 |
Undistributed Earnings of Foreign Subsidiaries | 2,800 | 2,500
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 209 |
Accrued penalties and interest | 7 | 7
State |  |
Valuation Allowance, Deferred Tax Asset, Change in Amount | 43 |
Operating Loss Carryforwards | 400 | $ 400
U.K. |  |
Operating Loss Carryforwards | $ 9,000 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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