Basis of Presentation - Additional Information (Details)	9 Months Ended
	Jun. 27, 2020 USD ($) wk	Sep. 29, 2019 USD ($)
Organization Consolidation And Presentation Of Financial Statements [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
Assets and Liabilities, Lessee [Abstract]
Operating Lease, Right-of-Use Asset | $	115,945,000	$ 103,100,000
Operating Lease, Liability | $	$ 115,487,000	$ 103,100,000
Tank Rent and Maintenance Service [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Revenue recognition, recognition period	1 year
Suburban Propane Partners, L.P. [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Limited partner interest in the Operating Partnership (in hundredths)	100.00%