PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS Part 13 (Details) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Aug. 01, 2007
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS [Abstract]
Extent of Lump-sum payments recognized, percentage	100%
Lump-sum payments recognized as settlements	$ (60,085,000)	$ (2,333,000)	$ (2,293,000)
Implementation period used to calculate return on plan assets (in years)	4 years
Gains or losses includible in cost amortized to extent exceeds benefit obligations or market-related value of plan assets, percentage.	10.00%
Recovery in rates for the qualified pension plans base allowance				15,500,000	4,800,000
Recovery in rates for postretirement benefit				9,500,000	7,600,000
Anticipated Contributions to pension plans for qualified trust	23,300,000
Anticipated contributions to pension plans for non-qualified plans	500,000
Medical insurance available until age is reached after early retirement	65
Amortization period for transition obligation excluded from postretirement benefit cost (in years)	20 years
Anticipated contributions to the postretirement plans for qualified trusts	15,700,000
Anticipated payment directly to participants in postretirement plan	800,000
Other Plans [Abstract]
401(K) plans, cost of defined contributions	$ 3,800,000	$ 3,600,000	$ 3,600,000