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Business Combinations and Divestitures - Additional Information (Detail) $ in Millions | 12 Months Ended
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Sep. 30, 2022 USD ($) PartnershipUnit | Sep. 30, 2021 USD ($) PartnershipUnit
Propane Assets |  |
Business Acquisition [Line Items] |  |
Cash proceeds from sale of assets |  | $ 6.1
Heating Oil Dealers | Scenario Forecast |  |
Business Acquisition [Line Items] |  |
Number of businesses acquired | PartnershipUnit | 4 |
Aggregate purchase price partnership acquired | $ 7.4 |
Cash paid | 6.5 |
Deferred liabilities | 0.9 |
Aggregate purchase price allocation, intangible assets | 4.9 |
Aggregate purchase price allocation, fixed assets | 3.2 |
Gross purchase price increased (reduced) by working capital credits | $ (0.7) |
Propane and Oil Dealers |  |
Business Acquisition [Line Items] |  |
Number of businesses acquired | PartnershipUnit |  | 2
Aggregate purchase price partnership acquired |  | $ 39.3
Cash paid |  | 38.4
Deferred liabilities |  | 0.9
Aggregate purchase price allocation, intangible assets |  | 34.3
Aggregate purchase price allocation, fixed assets |  | 5.8
Gross purchase price increased (reduced) by working capital credits |  | $ (0.8)

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