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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Aug. 31, 2020
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Aug. 31, 2019
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Aug. 31, 2018
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Sep. 30, 2022
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Sep. 30, 2021
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Sep. 30, 2020
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Segment
Sep. 30, 2019
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Sep. 30, 2018
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Oct. 27, 2020
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Oct. 01, 2019
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Sep. 30, 2017
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Schedule Of Significant Accounting Policies [Line Items]                      
Cash, cash equivalents, and restricted cash           $ 57,161,000 $ 5,149,000 $ 14,781,000     $ 52,708,000
Cash and cash equivalents           56,911,000 4,899,000        
Restricted cash           250,000 250,000        
Captive insurance collateral, debt securities           $ 69,787,000 58,490,000        
Number of reportable segments | Segment           1          
Goodwill impairment $ 0 $ 0 $ 0                
Minimum percentage of likelihood on goodwill impairment 50.00%                    
Liabilities held for sale           $ 1,265,000          
Other income (loss)           (5,724,000)   7,043,000      
Gain on sale of security customer account, cash portion               6,824,000      
Recognition of unamortized deferred service liabilities               400,000      
Other expenses               200,000      
Advertising expenses           $ 13,500,000 14,300,000 15,100,000      
Description of uncertain tax position           greater than 50%          
Derivative maximum payout           $ 5,000,000.0          
Operating lease right-of-use assets           99,776,000          
Current portion of operating lease liabilities           19,139,000          
Long-term operating lease liabilities           85,908,000          
Interest rate swap                      
Schedule Of Significant Accounting Policies [Line Items]                      
Notional Value           64,000,000.0 45,000,000.0        
ASC Topic 842                      
Schedule Of Significant Accounting Policies [Line Items]                      
Operating lease right-of-use assets                   $ 104,700,000  
Current portion of operating lease liabilities                   20,100,000  
Long-term operating lease liabilities                   $ 89,900,000  
Scenario Forecast                      
Schedule Of Significant Accounting Policies [Line Items]                      
Additional payment obligated to pay if degree days exceed ten year average         $ 5,000,000.0            
Derivative maximum payout       $ 0 5,000,000.0            
Financial Products Corporation | Delivery and branch expenses                      
Schedule Of Significant Accounting Policies [Line Items]                      
Charge on weather hedge contract           (10,100,000)   $ 2,100,000      
Operating Lease Obligations | Subsequent Event                      
Schedule Of Significant Accounting Policies [Line Items]                      
Liabilities held for sale                 $ 1,300,000    
Captive Insurance Collateral | Level 1                      
Schedule Of Significant Accounting Policies [Line Items]                      
Captive insurance collateral, debt securities           68,600,000 58,000,000.0        
Captive Insurance Collateral | Mutual Funds                      
Schedule Of Significant Accounting Policies [Line Items]                      
Captive insurance collateral, net asset value           1,200,000 $ 500,000        
Propane Assets                      
Schedule Of Significant Accounting Policies [Line Items]                      
Loss on sale of assets held for sale           $ (5,700,000)          
Propane Assets | Goodwill | Subsequent Event                      
Schedule Of Significant Accounting Policies [Line Items]                      
Assets held-for-sale                 4,400,000    
Propane Assets | Intangible Assets | Subsequent Event                      
Schedule Of Significant Accounting Policies [Line Items]                      
Assets held-for-sale                 800,000    
Propane Assets | Property and Equipment, Net | Subsequent Event                      
Schedule Of Significant Accounting Policies [Line Items]                      
Assets held-for-sale                 5,300,000    
Propane Assets | Operating Lease Right Use of Assets | Subsequent Event                      
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          
Maximum | Scenario Forecast                      
Schedule Of Significant Accounting Policies [Line Items]                      
Derivative maximum receivable       $ 7,500,000 $ 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