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Fair Value Measurements - Recurring Fair Value Measures Of Assets And Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Assets: |  |  |
Cash Equivalents – Money Market Mutual Funds | [1] | $ 26,831 | $ 29,238
Cash Equivalents - Money Market Mutual Funds Netting Adjustments |  | 0 | 0
Derivative Financial Instruments: |  |  |
Derivative Asset Netting Adjustment | [1] | $ (44,674) | $ (21,698)
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Fair Value of Derivative Financial Instruments | Fair Value of Derivative Financial Instruments
Total Assets | [1] | $ 59,216 | $ 154,040
Derivative Financial Instruments: |  |  |
Derivative Liability Netting Adjustments | [1] | $ (44,674) | $ (21,698)
Derivative Liability, Statement of Financial Position [Extensible Enumeration] |  | Fair Value of Derivative Financial Instruments | Fair Value of Derivative Financial Instruments
Total Liabilities | [1] | $ 57,228 | $ 4,735
Total Net Assets/(Liabilities) Netting Adjustments | [1] | 0 | 0
Total Net Assets/(Liabilities) | [1] | 1,988 | 149,305
Over the Counter Swaps – Gas |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset Netting Adjustment | [1] | (32,440) | (17,198)
Derivative asset | [1] | 2,005 | 58,811
Derivative Financial Instruments: |  |  |
Derivative Liability Netting Adjustments | [1] | (32,440) | (17,198)
Derivative liability | [1] | 30,457 | 5,008
Over the Counter No Cost Collars – Gas |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset Netting Adjustment | [1] | (11,750) | (3,774)
Derivative asset | [1] | 548 | 28,810
Derivative Financial Instruments: |  |  |
Derivative Liability Netting Adjustments | [1] | (11,750) | (3,774)
Derivative liability | [1] | 26,763 | (273)
Contingent Consideration for Asset Sale |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset Netting Adjustment | [1] | 0 | 0
Derivative asset | [1] | 0 | 729
Foreign Currency Contracts |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset Netting Adjustment | [1] | (484) | (726)
Derivative asset | [1] | (159) | (445)
Derivative Financial Instruments: |  |  |
Derivative Liability Netting Adjustments | [1] | (484) | (726)
Derivative liability | [1] | 8 | 0
Balanced Equity Mutual Fund |  |  |
Derivative Financial Instruments: |  |  |
Other Investments | [1] | 13,143 | 19,523
Derivative Financial Instruments: |  |  |
Other Investments Netting Adjustments | [1] | 0 | 0
Fixed Income Mutual Fund |  |  |
Derivative Financial Instruments: |  |  |
Other Investments | [1] | 16,848 | 17,374
Derivative Financial Instruments: |  |  |
Other Investments Netting Adjustments | [1] | 0 | 0
Level 1 |  |  |
Assets: |  |  |
Cash Equivalents – Money Market Mutual Funds |  | 26,831 | 29,238
Derivative Financial Instruments: |  |  |
Total Assets |  | 56,822 | 66,135
Derivative Financial Instruments: |  |  |
Total Liabilities |  | 0 | 0
Total Net Assets/(Liabilities) |  | 56,822 | 66,135
Level 1 | Over the Counter Swaps – Gas |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 0 | 0
Derivative Financial Instruments: |  |  |
Derivative Liability |  | 0 | 0
Level 1 | Over the Counter No Cost Collars – Gas |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 0 | 0
Derivative Financial Instruments: |  |  |
Derivative Liability |  | 0 | 0
Level 1 | Contingent Consideration for Asset Sale |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 0 | 0
Level 1 | Foreign Currency Contracts |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 0 | 0
Derivative Financial Instruments: |  |  |
Derivative Liability |  | 0 | 0
Level 1 | Balanced Equity Mutual Fund |  |  |
Derivative Financial Instruments: |  |  |
Other Investments |  | 13,143 | 19,523
Level 1 | Fixed Income Mutual Fund |  |  |
Derivative Financial Instruments: |  |  |
Other Investments |  | 16,848 | 17,374
Level 2 |  |  |
Assets: |  |  |
Cash Equivalents – Money Market Mutual Funds |  | 0 | 0
Derivative Financial Instruments: |  |  |
Total Assets |  | 47,068 | 109,603
Derivative Financial Instruments: |  |  |
Total Liabilities |  | 101,902 | 26,433
Total Net Assets/(Liabilities) |  | (54,834) | 83,170
Level 2 | Over the Counter Swaps – Gas |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 34,445 | 76,009
Derivative Financial Instruments: |  |  |
Derivative Liability |  | 62,897 | 22,206
Level 2 | Over the Counter No Cost Collars – Gas |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 12,298 | 32,584
Derivative Financial Instruments: |  |  |
Derivative Liability |  | 38,513 | 3,501
Level 2 | Contingent Consideration for Asset Sale |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 0 | 729
Level 2 | Foreign Currency Contracts |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 325 | 281
Derivative Financial Instruments: |  |  |
Derivative Liability |  | 492 | 726
Level 2 | Balanced Equity Mutual Fund |  |  |
Derivative Financial Instruments: |  |  |
Other Investments |  | 0 | 0
Level 2 | Fixed Income Mutual Fund |  |  |
Derivative Financial Instruments: |  |  |
Other Investments |  | 0 | 0
Level 3 |  |  |
Assets: |  |  |
Cash Equivalents – Money Market Mutual Funds |  | 0 | 0
Derivative Financial Instruments: |  |  |
Total Assets |  | 0 | 0
Derivative Financial Instruments: |  |  |
Total Liabilities |  | 0 | 0
Total Net Assets/(Liabilities) |  | 0 | 0
Level 3 | Over the Counter Swaps – Gas |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 0 | 0
Derivative Financial Instruments: |  |  |
Derivative Liability |  | 0 | 0
Level 3 | Over the Counter No Cost Collars – Gas |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 0 | 0
Derivative Financial Instruments: |  |  |
Derivative Liability |  | 0 | 0
Level 3 | Contingent Consideration for Asset Sale |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 0 | 0
Level 3 | Foreign Currency Contracts |  |  |
Derivative Financial Instruments: |  |  |
Derivative Asset |  | 0 | 0
Derivative Financial Instruments: |  |  |
Derivative Liability |  | 0 | 0
Level 3 | Balanced Equity Mutual Fund |  |  |
Derivative Financial Instruments: |  |  |
Other Investments |  | 0 | 0
Level 3 | Fixed Income Mutual Fund |  |  |
Derivative Financial Instruments: |  |  |
Other Investments |  | $ 0 | $ 0
[1] | Netting Adjustments represent the impact of legally-enforceable master netting arrangements that allow the Company to net gain and loss positions held with the same counterparties. The net asset or net liability for each counterparty is recorded as an asset or liability on the Company’s balance sheet.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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