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Commitments and Contingencies (EPA Accrual) (Details) - BTU International, Inc (BTU) Merger - Loss from Catastrophes - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
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Loss Contingencies [Line Items] |  |
Loss contingency accrual, less than | $ 0.1 | $ 0.1
Letters of credit | $ 0.0 |

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Details
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- Details
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