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Business Combinations and Divestitures - Additional Information (Detail)
$ in Millions
12 Months Ended
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)