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Note 10 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) MMBoe | Sep. 30, 2022 USD ($)
Nonmonetary Notional Amount of Natural Gas Derivative Contracts Not Designated As Normal Purchases Or Normal Sales (Millions of Barrels of Oil Equivalent) |  | 567,000,000 |
Notional Amount of Non Exchange Traded Natural Gas Commodity Contracts To Be Settled In Next Twelve Months (Millions of Barrels of Oil Equivalent) |  | 379.1 |
Notional Amount of Non Exchange Traded Natural Gas Commodity Contracts To Be Settled In Year Two (Millions of Barrels of Oil Equivalent) |  | 151.1 |
Notional Amount of Non Exchange Traded Natural Gas Commodity Contracts To Be Settled In Year Three (Millions of Barrels of Oil Equivalent) |  | 26.4 |
Notional Amount of Non Exchange Traded Natural Gas Commodity Contracts To Be Settled In Year Four (Millions of Barrels of Oil Equivalent) |  | 3.8 |
Notional Amount of Non Exchange Traded Natural Gas Commodity Contracts To Be Settled In Year Five (Millions of Barrels of Oil Equivalent) |  | 6.6 |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | $ |  | $ 44,200 |
Other Receivable from Broker-Dealer and Clearing Organization | $ |  | $ 0 | $ 49,800
Forecast [Member] |  |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | $ | $ 2,800 |  |
Spire Missouri [Member] |  |  |
Nonmonetary Notional Amount of Other Price Mitigation in Place Not Designated As Normal Purchases Or Normal Sales (Millions of Barrels of Oil Equivalent) |  | 16,300,000 |
Other Receivable from Broker-Dealer and Clearing Organization | $ |  | $ 0 | $ 24,000

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- Definition Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 + Details
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