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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

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- Definition Minimum concentration threshold accounted for by a single entity or an aggregate of entities expressed as a percentage as of the balance sheet date. The threshold serves as a benchmark which may include, but not limited to, customers, suppliers, geography or any other designation. + References No definition available. + Details
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