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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS Part 2 (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]      
Current year actuarial loss (gain) $ 17,030 $ 32,884 $ (13,485)
Amortization of actuarial loss (10,724) (29,091) (11,171)
Acceleration of loss recognized due to settlement 26,996 0 0
Amortization of prior service cost (544) (592) (642)
Sub-total (21,234) 3,201 (25,298)
Regulatory adjustment 21,159 (3,510) 24,533
Total recognized in other comprehensive income (75) (309) (765)
Postretirement Plans [Member]
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Current year actuarial loss (gain) 16,300 10,138 1,696
Amortization of actuarial loss (5,300) (4,261) (4,443)
Amortization of prior service cost (3) 2,072 2,328
Amortization of transition obligation (93) (136) (136)
Sub-total 10,904 7,813 (555)
Regulatory adjustment (10,904) (7,813) 555
Total recognized in other comprehensive income $ 0 $ 0 $ 0