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Financial Instruments (Tables)
 12 Months Ended
Sep. 30, 2024
Financial Instruments, Owned, at Fair Value, by Type, Alternative [Abstract]  
Schedule of Long-Term Debt Based on these criteria, the fair market value of long-term debt, including current portion, was as follows:
 At September 30
 
2024
Carrying
Amount
2024
 Fair Value
2023
Carrying
Amount
2023
 Fair Value
 (Thousands)
Long-Term Debt$2,688,243 $2,656,888 $2,384,485 $2,210,478 
Schedule of Other Investments
The components of the Company’s Other Investments are as follows (in thousands):
At September 30
20242023
(Thousands)
Life Insurance Contracts$44,808 $42,242 
Equity Mutual Fund19,523 15,837 
Fixed Income Mutual Fund17,374 15,897 
$81,705 $73,976 
Schedule of Derivative Financial Instruments Designated and Qualifying as Cash Flow Hedges on the Statements of Financial Performance
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Year Ended September 30, 2024 and 2023 (Dollar Amounts in Thousands)
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 Year Ended
September 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 Year Ended
September 30,
 20242023 20242023
Commodity Contracts$286,392 $708,234 Operating Revenue$217,012 $(88,015)
Foreign Currency Contracts502 (28)Operating Revenue(357)(641)
Total$286,894 $708,206 $216,655 $(88,656)