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Changes to Asset Retirement Obligation (Detail) (USD $)	9 Months Ended	12 Months Ended
Changes to Asset Retirement Obligation (Detail) (USD $)	Jun. 30, 2012	Sep. 30, 2011
Reconciliation of Changes in Asset Retirement Obligations [Line Items]
Balance, beginning of period	$ 387,368	$ 386,934
Liabilities incurred
Effect of foreign exchange	5,017	(5,490)
Disposal		(6,839)
Accretion expense	12,503	12,763
Balance, end of period	$ 404,888	$ 387,368

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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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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