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Financial Instruments (Tables)
 6 Months Ended
Mar. 31, 2025
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): 
 March 31, 2025September 30, 2024
 Carrying
Amount		Fair ValueCarrying
Amount		Fair Value
Long-Term Debt$2,731,126 $2,693,180 $2,688,243 $2,656,888 
Schedule Of Other Investments The components of the Company's Other Investments are as follows (in thousands):
At March 31, 2025At September 30, 2024
Life Insurance Contracts$43,150 $44,808 
Equity Mutual Fund12,210 19,523 
Fixed Income Mutual Fund16,592 17,374 
$71,952 $81,705 
Schedule of Derivative Financial Instruments Designated And Qualifying As Cash Flow Hedges On The Statement Of Financial Performance
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Three Months Ended March 31, 2025 and 2024 (Thousands of Dollars)
Derivatives in Cash Flow Hedging RelationshipsAmount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on
the Consolidated Statement of
Comprehensive Income (Loss)
for the
 Three Months Ended
 March 31,		Location of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of IncomeAmount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income for the
 Three Months Ended
 March 31,
 20252024 20252024
Commodity Contracts$(208,829)$71,876 Operating Revenue$(7,834)$60,184 
Foreign Currency Contracts(217)(712)Operating Revenue(326)(36)
Total$(209,046)$71,164  $(8,160)$60,148 
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Six Months Ended March 31, 2025 and 2024 (Thousands of Dollars)
Derivatives in Cash Flow Hedging Relationships Amount of Derivative Gain or
(Loss) Recognized in Other
Comprehensive Income (Loss) on
the Consolidated Statement of
Comprehensive Income (Loss)
for the
 Six Months Ended
March 31,		Location of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income Amount of Derivative Gain or
(Loss) Reclassified from
Accumulated Other
Comprehensive Income (Loss) on
the Consolidated Balance Sheet
into the Consolidated Statement of
Income for the
 Six Months Ended
 March 31,
 20252024 20252024
Commodity Contracts$(260,738)$259,865 Operating Revenue$21,894 $79,939 
Foreign Currency Contracts(1,824)466 Operating Revenue(550)(82)
Total$(262,562)$260,331  $21,344 $79,857