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Business Combinations and Divestitures - Additional Information (Detail) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2025 USD ($) PartnershipUnit | Jun. 30, 2024 USD ($) PartnershipUnit | Sep. 30, 2024 USD ($)
Business Acquisition [Line Items] |  |  |
Goodwill | $ 293,350 |  | $ 275,829
Acquisition of intangible and fixed assets | $ 7,700 |  |
Heating Oil Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit | 1 | 3 |
Cash and assuming | $ 80,500 | $ 22,600 |
Aggregate purchase price allocation, intangible assets | 38,700 | 14,400 |
Goodwill | 17,700 | 6,300 |
Aggregate purchase price allocation, fixed assets | 25,200 | 2,800 |
Gross purchase price increased (reduced) by working capital credits | (1,100) | $ (900) |
Cash proceeds from sale of assets | $ 300 |  |
Propane Dealers |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit | 3 | 1 |

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