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Financial Instruments (Tables)
 9 Months Ended
Jun. 30, 2024
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, 2024September 30, 2023
 Carrying
Amount		Fair ValueCarrying
Amount		Fair Value
Long-Term Debt$2,687,115 $2,598,784 $2,384,485 $2,210,478 
Schedule Of Other Investments The components of the Company's Other Investments are as follows (in thousands):
At June 30, 2024At September 30, 2023
Life Insurance Contracts$44,338 $42,242 
Equity Mutual Fund18,464 15,837 
Fixed Income Mutual Fund16,745 15,897 
$79,547 $73,976 
Schedule of Derivative Financial Instruments Designated And Qualifying As Cash Flow Hedges On The Statement Of Financial Performance
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Three Months Ended June 30, 2024 and 2023 (Thousands of Dollars)
Derivatives in Cash Flow Hedging RelationshipsAmount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on
the Consolidated Statement of
Comprehensive Income (Loss)
for the
 Three Months Ended
 June 30,		Location of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of IncomeAmount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income for the
 Three Months Ended
 June 30,
 20242023 20242023
Commodity Contracts$(21,682)$64,653 Operating Revenue$75,462 $57,842 
Foreign Currency Contracts(254)591 Operating Revenue(116)(150)
Total$(21,936)$65,244  $75,346 $57,692 

The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Nine Months Ended June 30, 2024 and 2023 (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,
 20242023 20242023
Commodity Contracts$238,184 $672,396 Operating Revenue$155,401 $(120,088)
Foreign Currency Contracts211 985 Operating Revenue(198)(502)
Total$238,395 $673,381  $155,203 $(120,590)