EMPLOYEE BENEFIT PLANS, Fair Value (Details) (USD $) In Thousands	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2009
Money market funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0		$ 10,100
Money market funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Money market funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Money market funds [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		10,100
Large Cap Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	18,754		18,641
Large Cap Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Large Cap Fund [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Large Cap Fund [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	18,754		18,641
Large Cap Index Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	18,922		18,129
Large Cap Index Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Large Cap Index Fund [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Large Cap Index Fund [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	18,922		18,129
Small Cap Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	6,505		6,598
Small Cap Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Small Cap Fund [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Small Cap Fund [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	6,505		6,598
World Equity ES-Us Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	20,993		23,600
World Equity ES-Us Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
World Equity ES-Us Fund [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
World Equity ES-Us Fund [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	20,993		23,600
Emerging Markets Debt Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	6,145		5,714
Emerging Markets Debt Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Emerging Markets Debt Fund [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Emerging Markets Debt Fund [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	6,145		5,714
High Yield Bond Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	12,537		11,284
High Yield Bond Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
High Yield Bond Fund [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
High Yield Bond Fund [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	12,537		11,284
Long Duration Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	40,433		28,799
Long Duration Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Long Duration Fund [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Long Duration Fund [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	40,433		28,799
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	124,289		122,865
Significant Other Observable Inputs (Level 2) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	124,289	[1]	122,865	[1]	100,639	[1]
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	31,428		27,644		22,195
OPEB [Member] | Money market funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,593		6
OPEB [Member] | Money market funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,593		6
OPEB [Member] | Money market funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Money market funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Large Cap Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	4,765		4,437
OPEB [Member] | Large Cap Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	4,765		4,437
OPEB [Member] | Large Cap Fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Large Cap Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Large Cap Index Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	4,825		4,469
OPEB [Member] | Large Cap Index Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	4,825		4,469
OPEB [Member] | Large Cap Index Fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Large Cap Index Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Small Cap Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,591		1,655
OPEB [Member] | Small Cap Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,591		1,655
OPEB [Member] | Small Cap Fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Small Cap Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | World Equity ES-Us Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5,550		5,416
OPEB [Member] | World Equity ES-Us Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5,550		5,416
OPEB [Member] | World Equity ES-Us Fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | World Equity ES-Us Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Emerging Markets Debt Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,589		1,470
OPEB [Member] | Emerging Markets Debt Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,589		1,470
OPEB [Member] | Emerging Markets Debt Fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Emerging Markets Debt Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Core Fixed Income Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8,366		7,207
OPEB [Member] | Core Fixed Income Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8,366		7,207
OPEB [Member] | Core Fixed Income Fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Core Fixed Income Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | High Yield Bond Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	3,149		2,984
OPEB [Member] | High Yield Bond Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	3,149		2,984
OPEB [Member] | High Yield Bond Fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | High Yield Bond Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	31,428		27,644
OPEB [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
OPEB [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0		$ 0

[1] Includes the Company's Pension Equalization Plan.