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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Aug. 31, 2023
USD ($)
Aug. 31, 2022
USD ($)
Aug. 31, 2021
USD ($)
Sep. 30, 2023
USD ($)
Segment
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Schedule Of Significant Accounting Policies [Line Items]              
Cash, cash equivalents, and restricted cash       $ 45,441,000 $ 14,870,000 $ 5,017,000 $ 57,161,000
Cash and cash equivalents       45,191,000 14,620,000    
Restricted cash       $ 250,000 250,000    
Number of reportable segments | Segment       1      
Goodwill impairment $ 0 $ 0 $ 0        
Minimum percentage of likelihood on goodwill impairment 50.00%            
Advertising expenses       $ 13,500,000 13,000,000.0 $ 13,500,000  
Description of uncertain tax position       greater than 50%      
Derivative maximum payout       $ 5,000,000      
Delivery and branch expense reduced under weather hedge contract       12,500,000 1,100,000    
Weather hedge contract receivable       12,500,000      
Cash Flow Hedging | Interest rate swap              
Schedule Of Significant Accounting Policies [Line Items]              
Cash flow hedging derivatives, amount       $ 24,000,000      
Propane Assets | Goodwill              
Schedule Of Significant Accounting Policies [Line Items]              
Assets held-for-sale         2,200,000    
Propane Assets | Property and Equipment, Net              
Schedule Of Significant Accounting Policies [Line Items]              
Assets held-for-sale         $ 800,000    
Maximum              
Schedule Of Significant Accounting Policies [Line Items]              
Cash equivalents, highly liquid investments maturity       3 months      
Derivative maximum receivable       $ 12,500,000      
Maximum | Customer Lists              
Schedule Of Significant Accounting Policies [Line Items]              
Intangible assets, amortization period       10 years      
Maximum | Trade Names              
Schedule Of Significant Accounting Policies [Line Items]              
Intangible assets, amortization period       20 years      
Maximum | Land Improvements              
Schedule Of Significant Accounting Policies [Line Items]              
Property and equipment, estimated useful lives       20 years      
Maximum | Buildings and leasehold improvements              
Schedule Of Significant Accounting Policies [Line Items]              
Property and equipment, estimated useful lives       30 years      
Maximum | Fleet and Other Equipment              
Schedule Of Significant Accounting Policies [Line Items]              
Property and equipment, estimated useful lives       15 years      
Maximum | Tanks and Equipment              
Schedule Of Significant Accounting Policies [Line Items]              
Property and equipment, estimated useful lives       10 years      
Maximum | Furniture, Fixtures and Office Equipment              
Schedule Of Significant Accounting Policies [Line Items]              
Property and equipment, estimated useful lives       10 years      
Minimum | Customer Lists              
Schedule Of Significant Accounting Policies [Line Items]              
Intangible assets, amortization period       7 years      
Minimum | Trade Names              
Schedule Of Significant Accounting Policies [Line Items]              
Intangible assets, amortization period       3 years      
Minimum | Land Improvements              
Schedule Of Significant Accounting Policies [Line Items]              
Property and equipment, estimated useful lives       10 years      
Minimum | Buildings and leasehold improvements              
Schedule Of Significant Accounting Policies [Line Items]              
Property and equipment, estimated useful lives       5 years      
Minimum | Fleet and Other Equipment              
Schedule Of Significant Accounting Policies [Line Items]              
Property and equipment, estimated useful lives       1 year      
Minimum | Tanks and Equipment              
Schedule Of Significant Accounting Policies [Line Items]              
Property and equipment, estimated useful lives       3 years      
Minimum | Furniture, Fixtures and Office Equipment              
Schedule Of Significant Accounting Policies [Line Items]              
Property and equipment, estimated useful lives       5 years