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Business Combinations - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
USD ($)
PartnershipUnit
Sep. 30, 2022
USD ($)
PartnershipUnit
Sep. 30, 2021
USD ($)
PartnershipUnit
Business Acquisition [Line Items]      
Goodwill $ 262,103 $ 254,110 $ 253,398
Heating Oil Businesses      
Business Acquisition [Line Items]      
Number of businesses acquired | PartnershipUnit 2 5 3
Aggregate purchase price partnership acquired $ 19,800 $ 15,600 $ 42,500
Cash and assuming 19,800 13,100 40,700
Liabilities   2,500 1,800
Aggregate purchase price allocation, intangible assets 10,400 7,300  
Goodwill 8,000 3,100  
Aggregate purchase price allocation, goodwill and intangible assets     37,300
Aggregate purchase price allocation, fixed assets 2,300 5,600 6,200
Gross purchase price increased (reduced) by working capital credits $ (900) $ (400) $ (1,000)
Propane Dealers      
Business Acquisition [Line Items]      
Number of businesses acquired | PartnershipUnit 1   2