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Business Combinations and Divestitures - Additional Information (Detail)
$ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
PartnershipUnit
Sep. 30, 2023
USD ($)
PartnershipUnit
Jun. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Business Acquisition [Line Items]        
Goodwill     $ 254,354 $ 254,110
Heating Oil Dealers        
Business Acquisition [Line Items]        
Number of businesses acquired | PartnershipUnit 5      
Aggregate purchase price partnership acquired $ 15,600      
Cash and assuming 13,100      
Liabilities 2,500      
Aggregate purchase price allocation, intangible assets 7,300      
Goodwill 3,100      
Aggregate purchase price allocation, fixed assets 5,600      
Gross purchase price increased (reduced) by working capital credits $ (400)      
Heating Oil Dealers | Scenario Forecast        
Business Acquisition [Line Items]        
Number of businesses acquired | PartnershipUnit   2    
Aggregate purchase price partnership acquired   $ 1,200    
Cash and assuming   1,200    
Aggregate purchase price allocation, intangible assets   1,700    
Goodwill   200    
Aggregate purchase price allocation, fixed assets   200    
Gross purchase price increased (reduced) by working capital credits   (900)    
Cash proceeds from sale of assets   $ 2,200