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Detail of Certain Balance Sheet Accounts (Details) - EnerTech [Member] | 12 Months Ended
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Sep. 30, 2016
Schedule of Equity Cost Investments [Line Items] |
Cost Method Investments Additional Information | we held an investment in EnerTech Capital Partners II L.P. (“EnerTech), a private investment fund
Equity Method Investment, Ownership Percentage | 2.21%

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- Definition This serves as a place to record data that is not specified elsewhere in the taxonomy but is useful for readers of the financial statements as it relates to the details of cost method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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