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Concentrations of Credit Risk - Additional Information (Details) Pures in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2025 USD ($)
Customer Concentration Risk [Member] | Utility Companies and Their Marketing Affiliates [Member] |
Concentration Risk [Line Items] |
Accounts Receivable, after Allowance for Credit Loss | $ 52.3
Customer Concentration Risk [Member] | Five Largest Counterparties [Member] |
Concentration Risk [Line Items] |
Accounts Receivable, after Allowance for Credit Loss | $ 25.6
Gas Utility [Member] |
Concentration Risk [Line Items] |
Number of Customer Serves | Pures | 1.7

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