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Summary of Significant Accounting Policies (Details)
$ in Millions
12 Months Ended
Sep. 28, 2019
wk
Partnership
shares
Sep. 29, 2018
shares
Sep. 30, 2017
shares
Sep. 29, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Minimum number of weeks in the fiscal year reporting calendar | wk 52      
Maximum number of weeks in the fiscal year reporting calendar | wk 53      
Minimum number of weeks in a fiscal quarter | wk 13      
Maximum number of weeks in a fiscal quarter | wk 14      
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 373,370 290,020 317,632  
Minimum [Member] | Subsequent Event [Member]        
Assets and Liabilities, Lessee [Abstract]        
Operating Lease, Right-of-Use Asset | $       $ 100
Operating Lease, Liability | $       100
Maximum [Member] | Subsequent Event [Member]        
Assets and Liabilities, Lessee [Abstract]        
Operating Lease, Right-of-Use Asset | $       110
Operating Lease, Liability | $       $ 110
Storage facilities [Member] | Weighted Average [Member]        
Property, Plant and Equipment [Abstract]        
Estimated useful life of the asset (in years) 23 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) 28 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%      
LIBOR [Member]        
Interest Rate Risk [Abstract]        
Description of applicable interest rate on borrowings LIBOR      
Basis spread (in hundredths) 1.00%      
Suburban Propane Partners, L.P. [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Limited partner interest in the Operating Partnership (in hundredths) 100.00%