Financial Instruments (Tables)

6 Months Ended

Mar. 31, 2021

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, 2021				September 30, 2020
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-Term Debt	$	2,627,033	$	2,869,081	$	2,629,576	$	2,778,556

Schedule Of Other Investments

The components of the Company's Other Investments are as follows (in thousands):

	At March 31, 2021		At September 30, 2020
Life Insurance Contracts	$	43,307	$	41,992
Equity Mutual Fund	32,993		39,618
Fixed Income Mutual Fund	70,133		72,253
Marketable Equity Securities	988		639
	$	147,421	$	154,502

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, 2021 and 2020 (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) 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	Amount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income for the  Three Months Ended  March 31,
	2021		2020			2021		2020
Commodity Contracts	$	(35,123)	$	81,108	Operating Revenue	$	(3,761)	$	23,396
Commodity Contracts	—		(134)		Purchased Gas	—		1,909
Foreign Currency Contracts	750		(4,670)		Operating Revenue	95		(271)
Total	$	(34,373)	$	76,304		$	(3,666)	$	25,034

The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Six Months Ended March 31, 2021 and 2020 (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) 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	Amount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income for the  Six Months Ended  March 31,
	2021		2020			2021		2020
Commodity Contracts	$	10,472	$	79,553	Operating Revenue	$	(4,071)	$	30,937
Commodity Contracts	—		997		Purchased Gas	—		1,911
Foreign Currency Contracts	3,176		(3,751)		Operating Revenue	94		(462)
Total	$	13,648	$	76,799		$	(3,977)	$	32,386