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Business Combinations and Divestitures - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) PartnershipUnit
Propane Assets |  |
Business Acquisition [Line Items] |  |
Cash proceeds from sale of assets |  | $ 6.1
Propane Dealers |  |
Business Acquisition [Line Items] |  |
Number of businesses acquired | PartnershipUnit |  | 2
Heating Oil Dealers |  |
Business Acquisition [Line Items] |  |
Number of businesses acquired | PartnershipUnit |  | 3
Propane and Heating Oil Dealers |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price partnership acquired |  | $ 42.5
Cash paid |  | 40.7
Deferred liabilities |  | 1.8
Aggregate purchase price allocation, intangible assets |  | 37.2
Aggregate purchase price allocation, fixed assets |  | 6.3
Gross purchase price increased (reduced) by working capital credits |  | $ (1.0)
Acquired Business |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price partnership acquired | $ 0.5 |

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