Accumulated Other Comprehensive Income (Table)

6 Months Ended

Mar. 31, 2013

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

			Available-for-Sale Securities		Interest Rate Agreement Cash Flow Hedges		Commodity Contracts Cash Flow Hedges		Total
		(In thousands)
September 30, 2012		$	5,661	$	(44,273)	$	(8,995)	$	(47,607)
Other comprehensive income before
	reclassifications		1,135		34,900		2,153		38,188
Amounts reclassified from accumulated
	other comprehensive income		(1,708)		873		6,320		5,485
Net current-period other
	comprehensive income		(573)		35,773		8,473		43,673
March 31, 2013		$	5,088	$	(8,500)	$	(522)	$	(3,934)

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

		Three Months ended March 31, 2013
Accumulated Other Comprehensive Income Components		Amount Reclassified from Accumulated Other Comprehensive Income	Affected Line Item in the Statement of Income
		(In thousands)
Available-for-sale securities	$	2,689	Operation and maintenance expense
		2,689	Total before tax
		(981)	Tax expense
	$	1,708	Net of tax
Cash flow hedges
Interest rate agreements	$	(873)	Interest charges
Commodity contracts		(5,201)	Purchased gas cost
		(6,074)	Total before tax
		2,348	Tax benefit
	$	(3,726)	Net of tax
Total reclassifications	$	(2,018)	Net of tax
		Six Months ended March 31, 2013
Accumulated Other Comprehensive Income Components		Amount Reclassified from Accumulated Other Comprehensive Income	Affected Line Item in the Statement of Income
		(In thousands)
Available-for-sale securities	$	2,689	Operation and maintenance expense
		2,689	Total before tax
		(981)	Tax expense
	$	1,708	Net of tax
Cash flow hedges
Interest rate agreements	$	(1,375)	Interest charges
Commodity contracts		(10,361)	Purchased gas cost
		(11,736)	Total before tax
		4,543	Tax benefit
	$	(7,193)	Net of tax
Total reclassifications	$	(5,485)	Net of tax