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Financial Instruments (Tables)
 3 Months Ended
Dec. 31, 2021
Financial Instruments, Owned, at Fair Value [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, 2021September 30, 2021
 Carrying
Amount		Fair ValueCarrying
Amount		Fair Value
Long-Term Debt$2,629,602 $2,847,638 $2,628,687 $2,898,552 
Schedule Of Other Investments The components of the Company's Other Investments are as follows (in thousands):
At December 31, 2021At September 30, 2021
Life Insurance Contracts$45,599 $44,560 
Equity Mutual Fund25,442 34,433 
Fixed Income Mutual Fund35,442 70,639 
$106,483 $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 December 31, 2021 and 2020 (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,
 20212020 20212020
Commodity Contracts$163,126 $45,595 Operating Revenue$(162,629)$(310)
Foreign Currency Contracts6 2,426 Operating Revenue41 (1)
Total$163,132 $48,021  $(162,588)$(311)