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Partnership Organization and Formation - Additional Information (Details)
Customer in Millions
Sep. 29, 2018
Customer
Location
State
shares
Sep. 30, 2017
shares
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]    
Common units outstanding (in units) 61,405,409 61,105,000
Ownership interest in Suburban Energy Finance Corp (in hundredths) 100.00%  
Number of residential, commercial, industrial and agricultural customers | Customer 1.0  
Number of locations served by the partnership | Location 700  
Number of states in which the partnership operates | State 41  
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