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Business Combinations and Divestitures - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2021 PartnershipUnit
Propane Assets |  |  |
Business Acquisition [Line Items] |  |  |
Cash proceeds from sale of assets |  | $ 6.1 |
Propane Dealers | Scenario Forecast |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit |  |  | 2
Heating Oil Dealers | Scenario Forecast |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit |  |  | 2
Propane and Heating Oil Dealers |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price partnership acquired |  | 39.3 |
Cash paid |  | 38.4 |
Deferred liabilities |  | 0.9 |
Aggregate purchase price allocation, intangible assets |  | 34.2 |
Aggregate purchase price allocation, fixed assets |  | 5.9 |
Gross purchase price increased (reduced) by working capital credits |  | $ (0.8) |
Acquired Business |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price partnership acquired | $ 0.5 |  |

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