Gain from Sale of an Unconsolidated Affiliate	12 Months Ended
Gain from Sale of an Unconsolidated Affiliate	Sep. 30, 2011
Gain from Sale of an Unconsolidated Affiliate [Abstract]
Gain from Sale of an Unconsolidated Affiliate [Text Block]	Gain from Sale of an Unconsolidated Affiliate In January 2009, we completed the sale of our remaining interests in a company formerly named WorldWater & Solar Technologies Corporation, now named Entech Solar, Inc. We sold our remaining shares of Entech Solar Series D Convertible Preferred Stock and warrants to a significant shareholder of both our Company and Entech Solar, for approximately $11.6 million, which included additional consideration of $0.2 million as a result of the termination of certain operating agreements with Entech Solar. We recognized a gain on the sale of this investment of approximately $3.1 million.

The entire disclosure for investments accounted for under the cost-method. The carrying amount of such investments may be adjusted, for example, distributions in excess of cost (return of capital) or for other-than-temporary impairments. The cost method and lower-of-cost or market, an adaptation of the cost method, is generally followed for most investments in noncontrolled corporations, in some corporate joint ventures, and to a lesser extent in unconsolidated subsidiaries in which the entity does not have the ability to exercise significant influence.

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