The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References+ Details

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details

Business Segments (Details) (USD $)	12 Months Ended
Business Segments (Details) (USD $)	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%