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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS Part 12 (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Pension Plans [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets $ 345,443 $ 274,130 $ 247,959
Derivative Assets, fair value measurements 4,186 3,027  
Cash margin payable 5,480 2,750  
Pension Plans [Member] | Cash and cash equivalents [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 18,177 57,614  
Pension Plans [Member] | Stock/Bond mutual fund [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 115,817    
Pension Plans [Member] | U.S. bond mutual funds [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 17,682 36,767  
Pension Plans [Member] | U.S. government [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 55,743 57,925  
Pension Plans [Member] | U.S. corporate [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 110,925 93,169  
Pension Plans [Member] | U.S. municipal [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 6,799 9,493  
Pension Plans [Member] | International [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 21,594 18,885  
Pension Plans [Member] | Derivative instrument [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets (1,294) [1] 277 [2]  
Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 35,859 94,381  
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 measurements of plan assets 18,177 57,614  
Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] | U.S. bond mutual funds [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 17,682 36,767  
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 309,584 179,749  
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | Stock/Bond mutual fund [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 115,817    
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | U.S. government [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 55,743 57,925  
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | U.S. corporate [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 110,925 93,169  
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | U.S. municipal [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 6,799 9,493  
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | International [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 21,594 18,885  
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | Derivative instrument [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets (1,294) [1] 277 [2]  
Postretirement Plans [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 111,645 67,442 51,744
Postretirement Plans [Member] | Cash and cash equivalents [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 1,411 1,106  
Postretirement Plans [Member] | Stock/Bond mutual fund [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 110,234 66,336  
Postretirement Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets 111,645 67,442  
Postretirement 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 measurements of plan assets 1,411 1,106  
Postretirement Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Stock/Bond mutual fund [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value measurements of plan assets $ 110,234 $ 66,336  
[1] Derivative assets of $4,186 net of cash margin payable of $5,480.
[2] Derivative assets of $3,027 net of cash margin payable of $2,750.