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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.