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Commitments and Contingencies (Development Projects) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |
Purchases of property, plant and equipment | $ 1,495 | $ 1,256 | $ 978 |
Tempress Systems and Energy Research Centre Agreement |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Purchases of property, plant and equipment |  |  |  | $ 1,400
Ownership rights, results of projects developed separately by individual parties |  |  |  | 100.00%
Research and development, required contribution, labor and assets |  |  |  | $ 1,400

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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