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Detail of Certain Balance Sheet Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2011 | Jun. 30, 2013 | Sep. 30, 2012
Schedule of Equity Cost Investments [Line Items] |  |  |  |
Carrying Value | $ 919 |  |  | $ 919
Enertech [Member] |  |  |  |
Schedule of Equity Cost Investments [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 2.21% |  |  | 2.21%
Other than Temporary Impairment Losses, Investments |  | 967 |  |
Receipt Of Distribution Reducing Carrying Value Of Asset |  |  | $ 84 |
CostMethodInvestmentsAdditionalInformation | In April 2000, we committed to invest up to $5,000 in EnerTech. We fulfilled our commitment in fiscal year 2008. |  |  |

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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