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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