Financial Instruments (Tables)

9 Months Ended

Jun. 30, 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): 

	June 30, 2017				September 30, 2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-Term Debt	$	2,087,954	$	2,220,588	$	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 June 30, 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 June 30,					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 June 30,						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 June 30,
	2017		2016				2017			2016				2017		2016
Commodity Contracts	$	17,342	$	(68,914	)	Operating Revenue	$	18,600		$	58,354		Operating Revenue	$	1,040	$	87
Commodity Contracts	240		(921		)	Purchased Gas	21			70			Not Applicable	—		—
Foreign Currency Contracts	651		(528		)	Operation and Maintenance Expense	(169		)	(51		)	Not Applicable	—		—
Total	$	18,233	$	(70,363	)		$	18,452		$	58,373			$	1,040	$	87

The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Nine Months Ended June 30, 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 Nine Months Ended June 30,					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 Nine Months Ended June 30,						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 Nine Months Ended June 30,
	2017			2016			2017			2016				2017		2016
Commodity Contracts	$	9,382		$	27,304	Operating Revenue	$	62,030		$	172,596		Operating Revenue	$	940	$	255
Commodity Contracts	(252		)	1,078		Purchased Gas	(1,938		)	4,520			Not Applicable	—		—
Foreign Currency Contracts	699			395		Operation and Maintenance Expense	(451		)	(337		)	Not Applicable	—		—
Total	$	9,829		$	28,777		$	59,641		$	176,779			$	940	$	255

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 Nine Months Ended June 30, 2017 (In Thousands)		Amount of Gain or (Loss) on the Hedged Item Recognized in the Consolidated Statement of Income for the Nine Months Ended June 30, 2017 (In Thousands)
Commodity Contracts	Operating Revenues	$	1,317	$	(1,317	)
Commodity Contracts	Purchased Gas	$	427	$	(427	)
		$	1,744	$	(1,744	)