Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Summary Of Significant Accounting Policies [Line Items]
Full cost ceiling test discount factor	10.00%
Increase (decrease) estimated future net cash flows	$ (33,600,000)	$ 71,600,000	$ 128,400,000
Amount full cost ceiling exceeds book value of oil and gas properties	148,400,000
Goodwill	5,476,000	5,476,000
Prior service credit	200,000	300,000
Gas stored underground - current	39,422,000	51,484,000
Customer Advances	19,005,000	21,959,000
Customer Security Deposits	15,761,000	16,183,000
Antidilutive securities	1,007	181,418	844,872
Accumulated Losses [Member]
Summary Of Significant Accounting Policies [Line Items]
Accumulated losses	56,200,000	56,600,000
Unamortized Debt Expense [Member]
Summary Of Significant Accounting Policies [Line Items]
Regulated Reacquisition of Debt Cost Weighted Average Amortization Period	5 years
Amount Exceeds LIFO Basis [Member]
Summary Of Significant Accounting Policies [Line Items]
Gas stored underground - current	33,200,000
LIFO Method [Member]
Summary Of Significant Accounting Policies [Line Items]
Gas stored underground - current	$ 25,300,000