Summary Of Significant Accounting Policies (Details) (USD $)	1 Months Ended	12 Months Ended
Oct. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Summary Of Significant Accounting Policies [Abstract]
Cash held in escrow			$ 1,000,000
Purchase of land	6,500,000
Retention amounts included in accounts receivable		8,700,000	6,100,000
Retained amount expected to be collected subsequent to September 30, 2013		4,000,000
Research and development costs included in selling, general and administrative expenses		$ 7,700,000	$ 7,500,000	$ 6,500,000

The cash outflow for acquisition of land for use; excludes purchases of land held as inventory or as investments.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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