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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Aug. 31, 2021
USD ($)
Aug. 31, 2020
USD ($)
Aug. 31, 2019
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Segment
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Schedule Of Significant Accounting Policies [Line Items]                
Cash, cash equivalents, and restricted cash         $ 5,017,000 $ 57,161,000 $ 5,149,000 $ 14,781,000
Cash and cash equivalents         4,767,000 56,911,000    
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%              
Liabilities held for sale         $ 0 1,265,000    
Other income (loss)         0 (5,724,000) 0  
Advertising expenses         $ 13,500,000 13,500,000 $ 14,300,000  
Description of uncertain tax position         greater than 50%      
Derivative maximum payout         $ 5,000,000.0 5,000,000.0    
Scenario Forecast                
Schedule Of Significant Accounting Policies [Line Items]                
Derivative maximum payout       $ 5.0        
Financial Products Corporation | Delivery and branch expenses                
Schedule Of Significant Accounting Policies [Line Items]                
Delivery and branch expense reduced under weather hedge contract         $ 3,400,000 10,100,000    
Operating Lease Obligations                
Schedule Of Significant Accounting Policies [Line Items]                
Liabilities held for sale           1,300,000    
Propane Assets                
Schedule Of Significant Accounting Policies [Line Items]                
Loss on sale of assets held for sale           (5,700,000)    
Propane Assets | Goodwill                
Schedule Of Significant Accounting Policies [Line Items]                
Assets held-for-sale           4,400,000    
Propane Assets | Intangible Assets                
Schedule Of Significant Accounting Policies [Line Items]                
Assets held-for-sale           800,000    
Propane Assets | Property and Equipment, Net                
Schedule Of Significant Accounting Policies [Line Items]                
Assets held-for-sale           5,300,000    
Propane Assets | Operating Lease Right Use of Assets                
Schedule Of Significant Accounting Policies [Line Items]                
Assets held-for-sale           1,300,000    
Maximum                
Schedule Of Significant Accounting Policies [Line Items]                
Cash equivalents, highly liquid investments maturity         3 months      
Derivative maximum receivable         $ 12,500,000 $ 12,500,000    
Maximum | Scenario Forecast                
Schedule Of Significant Accounting Policies [Line Items]                
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