Shareholders' Equity (Table)

6 Months Ended

Mar. 31, 2018

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following tables provide the components of our accumulated other comprehensive income (loss) balances, net of the related tax effects allocated to each component of other comprehensive income (loss):

	Available- for-Sale Securities			Interest Rate Agreement Cash Flow Hedges			Total
	(In thousands)
September 30, 2017	$	7,048		$	(112,302	)	$	(105,254	)
Other comprehensive income (loss) before reclassifications	(167		)	20,454			20,287
Amounts reclassified from accumulated other comprehensive income	(879		)	835			(44		)
Net current-period other comprehensive income (loss)	(1,046		)	21,289			20,243
March 31, 2018	$	6,002		$	(91,013	)	$	(85,011	)

	Available- for-Sale Securities		Interest Rate Agreement Cash Flow Hedges			Commodity Contracts Cash Flow Hedges			Total
	(In thousands)
September 30, 2016	$	4,484	$	(187,524	)	$	(4,982	)	$	(188,022	)
Other comprehensive income before reclassifications	634		95,271			9,847			105,752
Amounts reclassified from accumulated other comprehensive income	68		173			(4,865		)	(4,624		)
Net current-period other comprehensive income	702		95,444			4,982			101,128
March 31, 2017	$	5,186	$	(92,080	)	$	—		$	(86,894	)

Reclassification out of Accumulated Other Comprehensive Income

The following tables detail reclassifications out of AOCI for the three and six months ended March 31, 2018 and 2017. Amounts in parentheses below indicate decreases to net income in the statement of income:

	Three Months Ended March 31, 2018
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	$	1,139		Operation and maintenance expense
	1,139			Total before tax
	(260		)	Tax expense
	$	879		Net of tax
Cash flow hedges
Interest rate agreements	$	(593	)	Interest charges
	(593		)	Total before tax
	135			Tax benefit
	$	(458	)	Net of tax
Total reclassifications	$	421		Net of tax

	Three Months Ended March 31, 2017
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	$	(107	)	Operation and maintenance expense
	(107		)	Total before tax
	39			Tax benefit
	$	(68	)	Net of tax
Cash flow hedges
Interest rate agreements	$	(136	)	Interest charges
	(136		)	Total before tax
	50			Tax benefit
	$	(86	)	Net of tax
Total reclassifications	$	(154	)	Net of tax

	Six Months Ended March 31, 2018
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	$	1,139		Operation and maintenance expense
	1,139			Total before tax
	(260		)	Tax expense
	$	879		Net of tax
Cash flow hedges
Interest rate agreements	$	(1,187	)	Interest charges
	(1,187		)	Total before tax
	352			Tax benefit
	$	(835	)	Net of tax
Total reclassifications	$	44		Net of tax

	Six Months Ended March 31, 2017
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	$	(107	)	Operation and maintenance expense
	(107		)	Total before tax
	39			Tax benefit
	$	(68	)	Net of tax
Cash flow hedges
Interest rate agreements	$	(273	)	Interest charges
Commodity contracts	7,967			Purchased gas cost(1)
	7,694			Total before tax
	(3,002		)	Tax expense
	$	4,692		Net of tax
Total reclassifications	$	4,624		Net of tax

(1) Amount is presented as part of income from discontinued operations in the condensed consolidated statement of income.