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Business Combinations and Divestitures - Additional Information (Detail) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) PartnershipUnit | Dec. 31, 2022 USD ($) PartnershipUnit | Sep. 30, 2023 USD ($)
Business Acquisition [Line Items] |  |  |
Goodwill | $ 262,347 |  | $ 262,103
Heating Oil Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit | 2 | 2 |
Cash and assuming | $ 2,500 | $ 1,200 |
Aggregate purchase price allocation, intangible assets | 2,700 | 1,700 |
Goodwill | 200 | 200 |
Aggregate purchase price allocation, fixed assets | 800 | 200 |
Gross purchase price increased (reduced) by working capital credits | $ 1,200 | (900) |
Cash proceeds from sale of assets |  | $ 2,200 |

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