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Financial Instruments and Risk Management - Additional Information (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2017
USD ($)
Location
State
Sep. 24, 2016
USD ($)
Derivatives, Fair Value [Line Items]    
Cash collateral $ 0 $ 206
Number of locations served by the partnership | Location 668  
Number of states in which the partnership operates | State 41  
5.5% Senior Notes due June 1, 2024 [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value of Senior Notes $ 527,888  
5.75% Senior Notes due March 1, 2025 [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value of Senior Notes 248,750  
5.875% Senior Notes due March 1, 2027 [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value of Senior Notes $ 349,125  
Supplier Concentration Risk [Member] | Propane Purchases [Member]    
Derivatives, Fair Value [Line Items]    
Minimum concentration risk threshold accounted for by a single customer or supplier (in hundredths) 10.00%  
Supplier Concentration Risk [Member] | Propane Purchases [Member] | Crestwood Equity Partners L.P [Member]    
Derivatives, Fair Value [Line Items]    
Concentration percentage of propane supply provided by suppliers (in hundredths) 19.00%  
Supplier Concentration Risk [Member] | Propane Purchases [Member] | Targa Liquids Marketing and Trade LLC [Member]    
Derivatives, Fair Value [Line Items]    
Concentration percentage of propane supply provided by suppliers (in hundredths) 14.00%  
Supplier Concentration Risk [Member] | Propane Purchases [Member] | Phillips 66 Company [Member]    
Derivatives, Fair Value [Line Items]    
Concentration percentage of propane supply provided by suppliers (in hundredths) 11.00%  
Supplier Concentration Risk [Member] | Propane Purchases [Member] | Enterprise Products Partners L.P. [Member]    
Derivatives, Fair Value [Line Items]    
Concentration percentage of propane supply provided by suppliers (in hundredths) 11.00%  
Supplier Concentration Risk [Member] | Propane Purchases [Member] | Plains Marketing Company [Member]    
Derivatives, Fair Value [Line Items]    
Concentration percentage of propane supply provided by suppliers (in hundredths) 10.00%  
Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Weighted average maturity of outstanding commodity-related derivatives 5 months 6 months