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Business Combinations - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 USD ($) PartnershipUnit | Sep. 30, 2021 USD ($) PartnershipUnit | Sep. 30, 2020 USD ($) PartnershipUnit
Business Acquisition [Line Items] |  |  |
Goodwill | $ 254,110 | $ 253,398 | $ 240,327
Heating Oil Dealers |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit | 5 | 3 | 2
Aggregate purchase price partnership acquired | $ 15,600 | $ 42,500 | $ 3,300
Cash and assuming | 13,100 | 40,700 | 3,000
Liabilities | 2,500 | 1,800 | 300
Aggregate purchase price allocation, intangible assets | 7,300 |  |
Goodwill | 3,100 |  |
Aggregate purchase price allocation, goodwill and intangible assets |  | 37,300 | 3,200
Aggregate purchase price allocation, fixed assets | 5,600 | 6,200 | 600
Gross purchase price increased (reduced) by working capital credits | $ (400) | $ (1,000) | (500)
Fiscal 2019 Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price partnership acquired |  |  | $ 1,200
Propane Dealers |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit |  | 2 |

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