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Financial Instruments (Tables)
 12 Months Ended
Sep. 30, 2023
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
 
2023
Carrying
Amount
2023
 Fair Value
2022
Carrying
Amount
2022
 Fair Value
 (Thousands)
Long-Term Debt$2,384,485 $2,210,478 $2,632,409 $2,453,209 
Schedule of Other Investments
The components of the Company's Other Investments are as follows (in thousands):
At September 30
20232022
(Thousands)
Life Insurance Contracts$42,242 $42,171 
Equity Mutual Fund15,837 19,506 
Fixed Income Mutual Fund15,897 33,348 
$73,976 $95,025 
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, 2023 and 2022 (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,
 20232022 20232022
Commodity Contracts$708,234 $(1,048,200)Operating Revenue$(88,015)$(882,594)(1)
Foreign Currency Contracts(28)(2,631)Operating Revenue(641)13 
Total$708,206 $(1,050,831)$(88,656)$(882,581)
(1)On June 30, 2022, the Company completed the sale of Seneca's California assets. Because of this sale, the Company terminated its remaining crude oil derivative contracts and discontinued hedge accounting for such contracts. A loss of $44.6 million was reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet to Operating Revenues on the Consolidated Statement of Income for the year ended September 30, 2022. This loss is included in the reported reclassification amounts.