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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 12 Months Ended
Sep. 27, 2025
USD ($)
wk
Partnership
shares
Sep. 28, 2024
USD ($)
shares
Sep. 30, 2023
shares
Summary Of Significant Accounting Policies [Line Items]      
Minimum number of weeks in the fiscal year reporting calendar 52    
Maximum number of weeks in the fiscal year reporting calendar 53    
Minimum number of weeks in a fiscal quarter 13    
Maximum number of weeks in a fiscal quarter 14    
Remaining or unsatisfied performance obligations | $ $ 0    
Goodwill and Intangible Assets Disclosure [Abstract]      
Projection period for discounted cash flow analyses to estimate reporting unit fair value 10 years    
Income Taxes [Abstract]      
Number of limited partnerships included in the partnership structure | Partnership 2    
Net Income Per Unit [Abstract]      
Increase in weighted average units outstanding used to compute basic net income per Common Unit to reflect the potential dilutive effect of the unvested restricted units outstanding (in units) | shares 477,834 535,017 606,454
Assets and Liabilities, Lessee [Abstract]      
Operating Lease, Right-of-Use Asset | $ $ 118,997 $ 140,243  
Operating Lease, Liability | $ $ 118,013    
Storage facilities [Member] | Weighted Average [Member]      
Property, Plant and Equipment [Abstract]      
Estimated useful life of the asset (in years) 25 years    
Storage facilities [Member] | Minimum [Member]      
Property, Plant and Equipment [Abstract]      
Estimated useful life of the asset (in years) 7 years    
Storage facilities [Member] | Maximum [Member]      
Property, Plant and Equipment [Abstract]      
Estimated useful life of the asset (in years) 30 years    
Tanks and cylinders [Member} | Weighted Average [Member]      
Property, Plant and Equipment [Abstract]      
Estimated useful life of the asset (in years) 29 years    
Tanks and cylinders [Member} | Minimum [Member]      
Property, Plant and Equipment [Abstract]      
Estimated useful life of the asset (in years) 10 years    
Tanks and cylinders [Member} | Maximum [Member]      
Property, Plant and Equipment [Abstract]      
Estimated useful life of the asset (in years) 40 years    
Federal Funds Rate [Member]      
Interest Rate Risk [Abstract]      
Description of applicable interest rate on borrowings Federal Funds Rate    
Basis spread (in hundredths) 0.50%    
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Interest Rate Risk [Abstract]      
Description of applicable interest rate on borrowings SOFR    
Basis spread (in hundredths) 1.00%    
Tank Rent and Maintenance Service [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Revenue recognition, recognition period 1 year    
Suburban Propane Partners, L.P. [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Limited partner interest in the Operating Partnership (in hundredths) 100.00%