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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Contingency [Line Items] |  |  |
Statutory tax rate based on blended rate calculation |  | 24.50% |
(Reductions) additions to valuation allowance | $ (839) | $ 1,380 |
Operating loss carryforwards, annual utilization limits | 800 |  |
Unrecognized tax benefits that would impact effective tax rate | 600 |  |
Unrecognized tax benefits, income tax penalties and interest expense | (2,000) | 400 | $ 400
Unrecognized tax benefits, income tax penalties and interest accrued | $ 700 | $ 2,600 |
Minimum |  |  |
Income Tax Contingency [Line Items] |  |  |
Number of years open for tax examinations | 3 years |  |
Maximum |  |  |
Income Tax Contingency [Line Items] |  |  |
Number of years open for tax examinations | 5 years |  |
Federal |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | $ 14,000 |  |
Foreign Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | 53,000 |  |
State Jurisdiction |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | $ 3,600 |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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