Partnership Organization and Formation - Additional Information (Details) - shares	Mar. 28, 2020	Sep. 28, 2019
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]
Common units outstanding (in units)	62,073,452	61,735,000
Ownership interest in Suburban Energy Finance Corp (in hundredths)	100.00%
General Partner [Member] | Common Unitholders [Member]
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]
Common units outstanding (in units)	784