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Financial Instruments (Tables)
 12 Months Ended
Sep. 30, 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:
 At September 30
 2022
Carrying
Amount		2022
 Fair Value		2021
Carrying
Amount		2021
 Fair Value
 (Thousands)
Long-Term Debt$2,632,409 $2,453,209 $2,628,687 $2,898,552 
Schedule of Other Investments
The components of the Company's Other Investments are as follows (in thousands):
At September 30
20222021
(Thousands)
Life Insurance Contracts$42,171 $44,560 
Equity Mutual Fund19,506 34,433 
Fixed Income Mutual Fund33,348 70,639 
$95,025 $149,632 
Schedule Of Derivative Financial Instruments Designated And Qualifying As Cash Flow Hedges On The Statements Of Financial Performance
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Year Ended September 30, 2022 and 2021 (Dollar Amounts in Thousands)
Derivatives in Cash
Flow Hedging
Relationships		Amount of
Derivative Gain or (Loss) Recognized in Other
Comprehensive
Income (Loss) on the Consolidated Statement
of Comprehensive
Income (Loss)
for the Year Ended
September 30,		Location of
Derivative Gain or (Loss) Reclassified
from Accumulated
Other Comprehensive
Income (Loss) on
the Consolidated
Balance Sheet into the Consolidated
Statement of Income		Amount of
Derivative Gain or (Loss) Reclassified from Accumulated
Other Comprehensive
Income (Loss) on the Consolidated Balance
Sheet into the Consolidated
Statement of Income
for the Year Ended
September 30,
 20222021 20222021
Commodity Contracts$(1,048,200)$(668,074)Operating Revenue$(882,594)(1)$(83,973)
Foreign Currency Contracts(2,631)2,703 Operating Revenue13 262 
Total$(1,050,831)$(665,371)$(882,581)$(83,711)
(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.