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Financial Instruments (Tables)
 3 Months Ended
Dec. 31, 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): 
 December 31, 2024September 30, 2024
 Carrying
Amount		Fair ValueCarrying
Amount		Fair Value
Long-Term Debt$2,689,421 $2,618,660 $2,688,243 $2,656,888 
Schedule Of Other Investments The components of the Company's Other Investments are as follows (in thousands):
At December 31, 2024At September 30, 2024
Life Insurance Contracts$42,971 $44,808 
Equity Mutual Fund12,241 19,523 
Fixed Income Mutual Fund16,281 17,374 
$71,493 $81,705 
Schedule of Derivative Financial Instruments Designated And Qualifying As Cash Flow Hedges On The Statement Of Financial Performance
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Three Months Ended December 31, 2024 and 2023 (Thousands of Dollars)
Derivatives in Cash Flow Hedging RelationshipsAmount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on
the Consolidated Statement of
Comprehensive Income (Loss)
for the
 Three Months Ended
 December 31,		Location of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of IncomeAmount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income for the
 Three Months Ended
 December 31,
 20242023 20242023
Commodity Contracts$(51,909)$187,989 Operating Revenue$29,729 $19,755 
Foreign Currency Contracts(1,607)1,178 Operating Revenue(225)(47)
Total$(53,516)$189,167  $29,504 $19,708