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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS Part 12 (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value Measurement of Plan Assets	$ 274,130	$ 247,959	$ 240,922
Derivative Liabilities		10,661
Cash margin receivable		8,821
Derivative Assets, fair value measurements	3,027
Cash margin payable	2,750
Pension Plans [Member] \| Quoted Prices in Active Markets (Level 1) [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value Measurement of Plan Assets	57,614	2,123
Pension Plans [Member] \| Quoted Prices in Active Markets (Level 1) [Member] \| U.S. Stock/Bond Mutual Fund [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value Measurement of Plan Assets	36,767	36,542
Pension Plans [Member] \| Fair Value, Inputs, Level 2 [Member] \| U.S Government [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value Measurement of Plan Assets	57,925	80,185
Pension Plans [Member] \| Fair Value, Inputs, Level 2 [Member] \| U.S Corporate [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value Measurement of Plan Assets	93,169	103,352
Pension Plans [Member] \| Fair Value, Inputs, Level 2 [Member] \| U.S. Municipal [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value Measurement of Plan Assets	9,493	9,019
Pension Plans [Member] \| Fair Value, Inputs, Level 2 [Member] \| International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value Measurement of Plan Assets	18,885	18,578
Pension Plans [Member] \| Fair Value, Inputs, Level 2 [Member] \| Derivative Instrument [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value Measurement of Plan Assets	277	(1,840)
Postretirement Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value Measurement of Plan Assets	67,442	51,744	45,090
Postretirement Benefit [Member] \| Quoted Prices in Active Markets (Level 1) [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value Measurement of Plan Assets	1,106	1,109
Postretirement Benefit [Member] \| Quoted Prices in Active Markets (Level 1) [Member] \| U.S. Stock/Bond Mutual Fund [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value Measurement of Plan Assets	$ 66,336	$ 50,635

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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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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