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Financial Instruments and Risk Management - Additional Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Sep. 24, 2016 USD ($) Location State | Sep. 26, 2015 USD ($)
Derivatives, Fair Value [Line Items] |  |
Cash collateral | $ 206 | $ 553
Number of locations served by the partnership | Location | 675 |
Number of states in which the partnership operates | State | 41 |
7.375% Senior Notes due August 1, 2021 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Senior Notes | $ 360,893 |
5.5% Senior Notes due June 1, 2024 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Senior Notes | 534,188 |
5.75% Senior Notes due March 1, 2025 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Senior Notes | $ 253,438 |
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] | Crestwood Equity Partners L.P [Member] | Propane Purchases [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Concentration percentage of propane supply provided by suppliers (in hundredths) | 19.00% |
Supplier Concentration Risk [Member] | Targa Liquids Marketing and Trade LLC [Member] | Propane Purchases [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Concentration percentage of propane supply provided by suppliers (in hundredths) | 14.00% |
Supplier Concentration Risk [Member] | Enterprise Products Partners L.P. [Member] | Propane Purchases [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Concentration percentage of propane supply provided by suppliers (in hundredths) | 13.00% |
Supplier Concentration Risk [Member] | Phillips 66 Company [Member] | Propane Purchases [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 | 6 months | 7 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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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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