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Financial Instruments (Tables)
 9 Months Ended
Jun. 30, 2022
Financial Instruments, Owned, at Fair Value, by Type, Alternative [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, 2022September 30, 2021
 Carrying
Amount		Fair ValueCarrying
Amount		Fair Value
Long-Term Debt$2,631,463 $2,502,388 $2,628,687 $2,898,552 
Schedule Of Other Investments The components of the Company's Other Investments are as follows (in thousands):
At June 30, 2022At September 30, 2021
Life Insurance Contracts$41,930 $44,560 
Equity Mutual Fund20,700 34,433 
Fixed Income Mutual Fund33,936 70,639 
$96,566 $149,632 
Schedule of Derivative Financial Instruments Designated And Qualifying As Cash Flow Hedges On The Statement Of Financial Performance
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Three Months Ended June 30, 2022 and 2021 (Thousands of Dollars)
Derivatives in Cash Flow Hedging RelationshipsAmount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on
the Consolidated Statement of
Comprehensive Income (Loss)
for the
 Three Months Ended
 June 30,		Location of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of IncomeAmount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income for the
 Three Months Ended
 June 30,
 20222021 20222021
Commodity Contracts$(198,827)$(202,114)Operating Revenue$(298,372)
(1)
$(13,281)
Foreign Currency Contracts(1,257)616 Operating Revenue1 152 
Total$(200,084)$(201,498) $(298,371)$(13,129)
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Nine Months Ended June 30, 2022 and 2021 (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
 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 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
 Nine Months Ended
 June 30,
 20222021 20222021
Commodity Contracts$(677,942)$(191,642)Operating Revenue$(591,271)
(1)
$(17,351)
Foreign Currency Contracts(616)3,792 Operating Revenue91 245 
Total$(678,558)$(187,850) $(591,180)$(17,106)
(1)On June 30, 2022, the Company completed the sale of Seneca's California assets. Because of this sale, the Company terminated its remaining crude oil derivative contracts and discontinued hedge accounting for such contracts. A loss of $44.6 million was reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet to Operating Revenues on the Consolidated Statement of Income for the three and nine months ended June 30, 2022. This loss is included in the reported reclassification amounts.