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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS Part 1 (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
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]      
Service cost – benefits earned during the period $ 9,209 $ 9,203 $ 9,553
Interest cost on projected benefit obligation 16,959 19,358 18,819
Expected return on plan assets (19,358) (19,595) (18,849)
Amortization of prior service cost 544 592 642
Amortization of actuarial loss 10,724 9,040 10,228
Loss on lump-sum settlements 26,996 20,051 943
Sub-total 45,074 38,649 21,336
Regulatory adjustment (27,532) (18,579) (7,066)
Net pension cost 17,542 20,070 14,270
Postretirement Plans [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost – benefits earned during the period 10,162 8,060 7,676
Interest cost on projected benefit obligation 5,234 5,521 4,843
Expected return on plan assets (4,447) (3,965) (3,646)
Amortization of transition obligation 93 136 136
Amortization of prior service cost 3 (2,072) (2,328)
Amortization of actuarial loss 5,300 4,261 4,443
Sub-total 16,345 11,941 11,124
Regulatory adjustment (6,821) (2,417) (2,071)
Net pension cost $ 9,524 $ 9,524 $ 9,053