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EMPLOYEE BENEFIT PLANS (Details 3) (USD $) In Thousands				12 Months Ended
EMPLOYEE BENEFIT PLANS (Details 3) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2010 Oil and Gas Properties	Sep. 30, 2011 Oil and Gas Properties
Summary of changes in the fair value of the plan's Level 3 assets
Fair value of plan assets at beginning of year	$ 67,284	$ 61,388	$ 57,181	$ 435	$ 275
Unrealized losses relating to property still held at the reporting date				(160)
Fair value of plan assets at end of year	$ 67,284	$ 61,388	$ 57,181	$ 275	$ 275

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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