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EMPLOYEE BENEFIT PLANS, FAIR VALUE (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | --- | ---
Pension [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | $ 211,653 | [1] | $ 200,236 | [1] | $ 166,664 | [1]
OPEB [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 56,909 |  | 49,555 |  | 41,090 |
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 | 211,653 |  | 200,236 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Money Market Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 50 |  | 3 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Large Cap Index Fund [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 70,358 |  | 69,707 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Extended Market Index [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 12,475 |  | 14,736 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | World Equity ES-Us Fund [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 41,833 |  | 42,792 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Emerging Markets Debt Fund [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 10,029 |  | 8,754 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | High Yield Bond Fund [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 21,054 |  | 19,850 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Long Duration Fund [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 55,854 |  | 44,394 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 56,909 |  | 49,555 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Money Market Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 1,154 |  | 1,150 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Large Cap Index Fund [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 19,092 |  | 16,419 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Extended Market Index [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 3,733 |  | 3,444 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | World Equity ES-Us Fund [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 10,309 |  | 10,033 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Emerging Markets Debt Fund [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 2,798 |  | 2,163 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Core Fixed Income [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 6,522 |  | 11,684 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Opportunistic Income [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 3,960 |  | 0 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Ultra Short Duration [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | 3,761 |  | 0 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | High Yield Bond Fund [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets | $ 5,580 |  | $ 4,662 |  |  |
[1] | Includes the Company's PEP.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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