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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	9 Months Ended
	Jun. 30, 2012 Entity	Sep. 30, 2011	Sep. 30, 2010
Property, Plant and Equipment [Line Items]
Number of Wholly owned subsidiaries	2
Leasehold improvements amortization period	5 years
Asset retirement obligations	$ 404,888	$ 387,368	$ 386,934

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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