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Commitments and Contingencies - Asset Retirement Obligations (Details) (USD $)	3 Months Ended	9 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Fair Value Assumptions, Credit Adjusted Risk-Free Rate, Range Minimal Amount	3.25%	3.25%
Fair Value Assumptions, Credit Adjusted Risk-Free Rate, Range Maximum Amount	5.78%	5.78%
Asset Retirement Obligation, Liabilities Settled		$ 19,000
Asset Retirement Obligation, Accretion Expense	$ 51,000	$ 172,000

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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