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Income Tax Expense (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Income Tax Expense [Line Items] |  |  |
Accumulated unremitted earnings of foreign subsidiaries | $ 35,300 |  |
Accumulated unremitted earnings of foreign subsidiaries in cash | 31,500 |  |
Income taxes due if foreign entities' earnings were distributed | 4,900 |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 100 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 0 | $ 0 | $ 100
Capital loss carryforward, valuation allowance | 500 | 400 |
Operating Loss Carryforwards, Valuation Allowance | 300 | 300 |
Net operating loss carryforward - foreign | 4,135 | 4,702 |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 15,100 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 1,400 |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 300 |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research | 1,700 |  |
State Research And Other Credit CarryForwards With Expiration Date | 1,300 |  |
State Research And Other Credit Carry Forwards Without Expiration Date | 400 |  |
Deferred Tax Assets, Valuation Allowance | 4,129 | 4,297 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 200 | 500 |
Brazil, Germany, India, Finland, China and the United Kingdom [Member] |  |  |
Income Tax Expense [Line Items] |  |  |
Net operating loss carryforward - foreign | 16,500 |  |
Foreign Valuation Allowance [Member] |  |  |
Income Tax Expense [Line Items] |  |  |
Operating Loss Carryforwards, Valuation Allowance | $ 3,300 | $ 3,600 |

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