Financial Instruments (Tables)

6 Months Ended

Mar. 31, 2017

Financial Instruments, Owned, at Fair Value [Abstract]

Long-Term Debt

Based on these criteria, the fair market value of long-term debt, including current portion, was as follows (in thousands): 

	March 31, 2017				September 30, 2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-Term Debt	$	2,087,385	$	2,221,216	$	2,086,252	$	2,255,562

Schedule Of Derivative Financial Instruments Designated And Qualifying As Cash Flow Hedges On The Statement Of Financial Performance

The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Three Months Ended March 31, 2017 and 2016 (Thousands of Dollars)
Derivatives in Cash Flow Hedging Relationships	Amount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on the Consolidated Statement of Comprehensive Income (Loss) (Effective Portion) for the Three Months Ended March 31,					Location of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income (Effective Portion)	Amount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income (Effective Portion) for the Three Months Ended March 31,						Location of Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) for the Three Months Ended March 31,
	2017		2016				2017			2016				2017		2016
Commodity Contracts	$	42,484	$	30,876		Operating Revenue	$	12,109		$	57,914		Operating Revenue	$	—	$	31
Commodity Contracts	1,044		(214		)	Purchased Gas	(1,498		)	3,530			Not Applicable	—		—
Foreign Currency Contracts	569		3,106			Operation and Maintenance Expense	(139		)	(209		)	Not Applicable	—		—
Total	$	44,097	$	33,768			$	10,472		$	61,235			$	—	$	31

The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Six Months Ended March 31, 2017 and 2016 (Thousands of Dollars)
Derivatives in Cash Flow Hedging Relationships	Amount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on the Consolidated Statement of Comprehensive Income (Loss) (Effective Portion) for the Six Months Ended March 31,					Location of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income (Effective Portion)	Amount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income (Effective Portion) for the Six Months Ended March 31,						Location of Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) for the Six Months Ended March 31,
	2017			2016			2017			2016				2017			2016
Commodity Contracts	$	(7,960	)	$	96,217	Operating Revenue	$	43,429		$	114,242		Operating Revenue	$	(100	)	$	168
Commodity Contracts	(492		)	1,999		Purchased Gas	(1,958		)	4,450			Not Applicable	—			—
Foreign Currency Contracts	48			923		Operation and Maintenance Expense	(282		)	(287		)	Not Applicable	—			—
Total	$	(8,404	)	$	99,139		$	41,189		$	118,405			$	(100	)	$	168

Schedule Of Derivatives And Hedged Items In Fair Value Hedging Relationships

For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative as well as the offsetting gain or loss on the hedged item attributable to the hedged risk completely offset each other in current earnings, as shown below.

Derivatives in Fair Value Hedging Relationships	Location of Gain or (Loss) on Derivative and Hedged Item Recognized in the Consolidated Statement of Income	Amount of Gain or (Loss) on Derivative Recognized in the Consolidated Statement of Income for the Six Months Ended March 31, 2017 (In Thousands)		Amount of Gain or (Loss) on the Hedged Item Recognized in the Consolidated Statement of Income for the Six Months Ended March 31, 2017 (In Thousands)
Commodity Contracts	Operating Revenues	$	2,954	$	(2,954	)
Commodity Contracts	Purchased Gas	$	226	$	(226	)
		$	3,180	$	(3,180	)