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Business Combinations and Divestitures - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2022 USD ($) PartnershipUnit | Sep. 30, 2021 USD ($) PartnershipUnit | Jun. 30, 2022 USD ($)
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 253,398 | $ 256,471
Propane Assets |  |  |
Business Acquisition [Line Items] |  |  |
Cash proceeds from sale of assets |  | $ 6,100 |
Heating Oil Dealers |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit |  | 3 |
Heating Oil Dealers | Scenario Forecast |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit | 5 |  |
Aggregate purchase price partnership acquired | $ 15,600 |  |
Cash paid | 13,100 |  |
Deferred liabilities | 2,500 |  |
Aggregate purchase price allocation, intangible assets | 7,300 |  |
Goodwill | 3,100 |  |
Aggregate purchase price allocation, fixed assets | 5,600 |  |
Gross purchase price increased (reduced) by working capital credits | $ (400) |  |
Propane and Oil Dealers |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price partnership acquired |  | $ 42,500 |
Cash paid |  | 40,700 |
Deferred liabilities |  | 1,800 |
Aggregate purchase price allocation, Goodwill and intangible assets |  | 37,300 |
Aggregate purchase price allocation, fixed assets |  | 6,200 |
Gross purchase price increased (reduced) by working capital credits |  | $ 1,000 |
Propane Dealers |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit |  | 2 |

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