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Financial Instruments (Tables)
 12 Months Ended
Sep. 30, 2025
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
 
2025
Carrying
Amount
2025
 Fair Value
2024
Carrying
Amount
2024
 Fair Value
 (Thousands)
Long-Term Debt$2,682,861 $2,696,145 $2,688,243 $2,656,888 
Schedule of Other Investments
The components of the Company’s Other Investments are as follows (in thousands):
At September 30
20252024
(Thousands)
Life Insurance Contracts$44,478 $44,808 
Equity Mutual Fund13,786 19,523 
Fixed Income Mutual Fund10,082 17,374 
$68,346 $81,705 
Schedule of Derivative Financial Instruments Designated and Qualifying as Cash Flow Hedges on the Statements of Financial Performance
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Year Ended September 30, 2025 and 2024 (Dollar Amounts in Thousands)
Derivatives in Cash
Flow Hedging
Relationships		Amount of
Derivative Gain or (Loss) Recognized in Other
Comprehensive
Income (Loss) on the Consolidated Statement
of Comprehensive
Income (Loss)
for the Year Ended
September 30,		Location of
Derivative Gain or (Loss) Reclassified
from Accumulated
Other Comprehensive
Income (Loss) on
the Consolidated
Balance Sheet into the Consolidated
Statement of Income		Amount of
Derivative Gain or (Loss) Reclassified from Accumulated
Other Comprehensive
Income (Loss) on the Consolidated Balance
Sheet into the Consolidated
Statement of Income
for the Year Ended
September 30,
 20252024 20252024
Commodity Contracts$(1,795)$286,392 Operating Revenue$46,957 $217,012 
Foreign Currency Contracts(1,371)502 Operating Revenue(1,066)(357)
Total$(3,166)$286,894 $45,891 $216,655