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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) - USD ($)
 12 Months Ended
Feb. 28, 2024
Feb. 27, 2024
Oct. 31, 2023
Sep. 26, 2023
Jul. 06, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Debt Instrument [Line Items]                
Additional loan repayments           $ 16,500,000 $ 110,500,000 $ 13,000,000
Hedging positions and payable amounts secured under credit facility           100,000 0  
Letters of credit issued and outstanding           3,200,000 5,100,000  
Long-term debt, fair value [1]           148,740,000 185,276,000  
Revolving credit facility outstanding           240,000 20,276,000  
Availability under credit agreement           202,100,000 189,400,000  
Total restricted net assets           253,700,000 $ 248,000,000  
Sixth Amendment                
Debt Instrument [Line Items]                
Non Seasonal maximum borrowing capacity under revolving credit facility         $ 400,000,000      
Maximum borrowing capacity (heating season December to April) under revolving credit facility         550,000,000      
Sixth Amendment | Scenario Forecast                
Debt Instrument [Line Items]                
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units 115.00% 1.00%            
Credit Agreement                
Debt Instrument [Line Items]                
Non Seasonal maximum borrowing capacity under revolving credit facility         400,000,000      
Maximum borrowing capacity (heating season December to April) under revolving credit facility         550,000,000      
Issuance of line of credit for working capital purposes         $ 25,000,000      
Senior secured term loan maturity date         Jul. 06, 2027      
Facility size that can be increased without consulting bank group         $ 200,000,000      
Term loan annual payment percentage         25.00%      
Commitment fee on the unused portion of the facility from December through April         0.30%      
Commitment fee on the unused portion of the facility from May through November         0.20%      
Minimum fixed charge coverage ratio         110.00%      
Availability percentage to maximum facility size       12.50% 12.50%      
Facility size that can be increased additional without consulting bank group           200,000,000    
Credit Agreement | Scenario Forecast                
Debt Instrument [Line Items]                
Minimum fixed charge coverage ratio to be maintained credit facilities   1.00%            
Maximum | Credit Agreement                
Debt Instrument [Line Items]                
Senior secured leverage ratio during quarters ending June or September         300.00%      
Senior secured leverage ratio during quarters ending December or March         550.00%      
Quarterly | Credit Agreement                
Debt Instrument [Line Items]                
Term loan periodic payment         $ 4,100,000      
Annually | Maximum | Credit Agreement                
Debt Instrument [Line Items]                
Term loan periodic payment         8,500,000      
Subsequent Event | Sixth Amendment                
Debt Instrument [Line Items]                
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units     1.15%          
Subsequent Event | Credit Agreement                
Debt Instrument [Line Items]                
Minimum fixed charge coverage ratio to be maintained credit facilities     1.10%          
Term Loan                
Debt Instrument [Line Items]                
Additional loan repayments           $ 4,000,000    
Debt instrument, effective interest rate           6.60% 4.70%  
Long-term debt, fair value [1],[2]           $ 148,500,000 $ 165,000,000  
Excess cash flow payment             $ 0  
Term Loan | Sixth Amendment                
Debt Instrument [Line Items]                
Outstanding term loan         $ 165,000,000      
Senior secured term loan maturity period         5 years      
Term Loan | Credit Agreement                
Debt Instrument [Line Items]                
Outstanding term loan         $ 165,000,000      
Senior secured term loan maturity period         5 years      
Revolving Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, effective interest rate           6.30% 2.60%  
Revolving credit facility outstanding           $ 200,000 $ 20,300,000  
[1] The face amount of the Company’s variable rate long-term debt approximates fair value.
[2] Carrying amounts are net of unamortized debt issuance costs of $0.7 million as of September 30, 2023 and $0.9 million as of September 30, 2022.