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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