DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Part 3 (Details) (USD $)	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013
Derivatives, Fair Value [Line Items]
Other Receivables from Broker-Dealers and Clearing Organizations	$ 300,000	$ 2,900,000	$ 8,000,000
Liabilities Fair Value	4,126,000	8,898,000	339,000
Asset Derivatives Fair Value	13,362,000	1,803,000	11,184,000
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Liabilities Fair Value	4,126,000	8,898,000	339,000
Asset Derivatives Fair Value	13,313,000	1,698,000	10,872,000
Not Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member]
Derivatives, Fair Value [Line Items]
Liabilities Fair Value	0
Asset Derivatives Fair Value	2,516,000
Not Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Accounts Receivable - Other [Member]
Derivatives, Fair Value [Line Items]
Liabilities Fair Value	3,811,000	3,455,000	339,000
Asset Derivatives Fair Value	4,467,000	1,434,000	10,862,000
Not Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member] | Accounts Receivable - Other [Member]
Derivatives, Fair Value [Line Items]
Liabilities Fair Value		4,045,000	0
Asset Derivatives Fair Value		228,000	10,000
Not Designated as Hedging Instrument [Member] | OTCBB Natural Gas Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liabilities Fair Value	193,000
Asset Derivatives Fair Value	6,266,000
Not Designated as Hedging Instrument [Member] | OTCBB Natural Gas Contracts [Member] | Other Deferred Credits [Member]
Derivatives, Fair Value [Line Items]
Liabilities Fair Value	122,000	1,398,000
Asset Derivatives Fair Value	64,000	4,000
Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Other Deferred Charges [Member]
Derivatives, Fair Value [Line Items]
Liabilities Fair Value		0
Asset Derivatives Fair Value		32,000
Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member]
Derivatives, Fair Value [Line Items]
Liabilities Fair Value	0
Asset Derivatives Fair Value	49,000
Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member] | Accounts Receivable - Other [Member]
Derivatives, Fair Value [Line Items]
Liabilities Fair Value		0	0
Asset Derivatives Fair Value		$ 105,000	$ 312,000