Financial Instruments (Tables)
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9 Months Ended |
Jun. 30, 2026 |
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| Financial Instruments, Owned, at Fair Value, by Type, Alternative [Abstract] |
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| Schedule of Long-Term Debt |
Based on these criteria, the fair market value of long-term debt, including current portion, was as follows (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2026 | | September 30, 2025 | | | Carrying
Amount | | Fair Value | | Carrying
Amount | | Fair Value | | Long-Term Debt | $ | 3,567,401 | | | $ | 3,562,414 | | | $ | 2,682,861 | | | $ | 2,696,145 | |
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| Schedule of Other Investments |
The components of the Company's Other Investments are as follows (in thousands): | | | | | | | | | | | | | At June 30, 2026 | | At September 30, 2025 | | | | | | Life Insurance Contracts | $ | 41,561 | | | $ | 44,478 | | | Equity Mutual Fund | 15,093 | | | 13,786 | | | Fixed Income Mutual Fund | 10,292 | | | 10,082 | | | | | | | $ | 66,946 | | | $ | 68,346 | |
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| Schedule of Cash Flow Hedges |
| | | | | | | | | | | | | | | | | | | The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the | | Three Months Ended June 30, 2026 and 2025 (Thousands of Dollars) | | 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
Three Months Ended
June 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
Three Months Ended
June 30, | | | 2026 | 2025 | | 2026 | 2025 | | Commodity Contracts | $ | 70,098 | | $ | 147,594 | | Operating Revenue | $ | 58,258 | | $ | 2,515 | | | | | | | | | Foreign Currency Contracts | (369) | | 1,294 | | Operating Revenue | (88) | | (257) | | | Total | $ | 69,729 | | $ | 148,888 | | | $ | 58,170 | | $ | 2,258 | |
| | | | | | | | | | | | | | | | | | | The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the | | Nine Months Ended June 30, 2026 and 2025 (Thousands of Dollars) | | 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
Nine Months Ended
June 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
Nine Months Ended
June 30, | | | 2026 | 2025 | | 2026 | 2025 | | Commodity Contracts | $ | 117,239 | | $ | (113,145) | | Operating Revenue | $ | 22,959 | | $ | 24,409 | | | | | | | | | Foreign Currency Contracts | (602) | | (530) | | Operating Revenue | (275) | | (808) | | | Total | $ | 116,637 | | $ | (113,675) | | | $ | 22,684 | | $ | 23,601 | | | | | | | |
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