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Income Tax Expense (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Income Tax Expense [Line Items] |  |
Accumulated unremitted earnings of foreign subsidiaries | $ 48,900 |
Accumulated unremitted earnings of foreign subsidiaries in cash | 28,400 |
Income taxes due if foreign entities' earnings were distributed | 6,900 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 100 | $ 100
Capital loss carryforward, valuation allowance | 400 | 600
Operating Loss Carryforwards, Valuation Allowance | 400 | 300
Net operating loss carryforward - foreign | 4,486 | 4,991
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 15,000 |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 3,200 |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 500 |
Deferred Tax Assets, Tax Credit Carryforwards, Research | 2,100 |
State Research And Other Credit CarryForwards With Expiration Date | 1,700 |
State Research And Other Credit Carry Forwards Without Expiration Date | 400 |
Deferred Tax Assets, Valuation Allowance | 4,440 | 5,711
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 1,300 | 1,600
FINLAND |  |
Income Tax Expense [Line Items] |  |
Deferred Tax Assets, Net | 300 |
Deferred Tax Assets, Operating Loss Carryforwards | 2,800 |
Brazil, Germany, India, Finland, China and the United Kingdom [Member] |  |
Income Tax Expense [Line Items] |  |
Net operating loss carryforward - foreign | 18,200 |
Foreign Valuation Allowance [Member] |  |
Income Tax Expense [Line Items] |  |
Operating Loss Carryforwards, Valuation Allowance | $ 3,700 | $ 4,800

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