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ASSET RETIREMENT OBLIGATIONS (ARO) (Details) (USD $) In Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2011	Sep. 30, 2010
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at October 1	$ 26,009	$ 25,097
Accretion	1,242	1,572
Additions	0	149
Asset Retirement Obligation, Liabilities Settled	(711)	(809)
Balance at period end	$ 26,540	$ 26,009

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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