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Business Segments (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Number of reportable business segments | 2 |  |
Gain on sale of investment |  | 1,229,000 |
Consolidated Revenue [Member] | Geographic Concentration Risk [Member] | UNITED STATES |  |  |
Concentration risk percentage | 58.00% | 67.00% | 71.00%
Customer Revenue [Member] | Geographic Concentration Risk [Member] | CANADA |  |  |
Concentration risk percentage | 13.00% | 17.00% |
Customer Revenue [Member] | Geographic Concentration Risk [Member] | COLOMBIA |  |  |
Concentration risk percentage | 11.00% |  |
Powell Canada [Member] |  |  |
Intangible assets impairment charge |  | 7,200,000 |
Loss on impairment of Goodwill |  |  | 7,500,000
Kazakhstan Joint Venture [Member] |  |  |
Equity investment in Kazakhstan |  |  | 50.00%

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