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Financial Instruments (Tables)
 3 Months Ended
Dec. 31, 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): 
 December 31, 2022September 30, 2022
 Carrying
Amount		Fair ValueCarrying
Amount		Fair Value
Long-Term Debt$2,483,363 $2,320,923 $2,632,409 $2,453,209 
Schedule Of Other Investments The components of the Company's Other Investments are as follows (in thousands):
At December 31, 2022At September 30, 2022
Life Insurance Contracts$42,333 $42,171 
Equity Mutual Fund14,929 19,506 
Fixed Income Mutual Fund15,608 33,348 
$72,870 $95,025 
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, 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
 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,
 20222021 20222021
Commodity Contracts$297,120 $163,126 Operating Revenue$(159,162)$(162,629)
Foreign Currency Contracts473 6 Operating Revenue(180)41 
Total$297,593 $163,132  $(159,342)$(162,588)