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Acquisition of Inergy Propane (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 14, 2012 | Aug. 01, 2012 | Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012 | Sep. 14, 2012
Assets acquired [Abstract] |  |  |  |  |  |
Cash and cash equivalents |  | $ 7,964 |  |  |  |
Accounts receivable |  | 36,076 |  |  |  |
Inventories |  | 30,457 |  |  |  |
Other current assets |  | 2,067 |  |  |  |
Current assets acquired |  | 76,564 |  |  |  |
Property, plant & equipment |  | 617,854 |  |  |  |
Customer relationships (estimated useful life of 9 years) |  | 445,500 |  |  |  |
Non-compete agreements (estimated useful life of 6 years) |  | 23,059 |  |  |  |
Other intangible assets (estimated useful life of 4 years) |  | 1,983 |  |  |  |
Goodwill |  | 809,778 |  |  |  |
Other assets |  | 2,151 |  |  |  |
Total assets acquired |  | 1,976,889 |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Accounts payable |  | 16 |  |  |  |
Accrued employment and benefit costs |  | 2,149 |  |  |  |
Customer deposits and advances |  | 48,469 |  |  |  |
Other current liabilities |  | 18,613 |  |  |  |
Other noncurrent liabilities |  | 16,727 |  |  |  |
Total liabilities assumed |  | 85,974 |  |  |  |
Total |  | 1,890,915 |  |  |  |
New common units issued as part of acquisition |  | 600,000 |  |  |  |
Number of trading days |  | 20 days |  |  |  |
Average sales price of common units (in dollars per unit) |  | $ 43.1885 |  |  |  |
New common units issued as part of acquisition (in units) |  | 13,892,587 |  |  |  |
Maximum potential cash payment to tendering noteholders as part of an acquisition |  | 200,000 |  |  |  |
Aggregate cash consent payments to acquiree in connection with note exchange |  | 65,000 |  |  |  |
Cash paid by acquiree to Partnership |  | 36,500 |  |  |  |
Equity Exchange Cash Consideration due to tendering noteholders in connection with note exchange |  | 184,761 |  |  |  |
Common units issued in satisfaction of Inergy Cash Consideration (in units) |  | 307,835 |  |  |  |
Total common units issued to acquiree, including units issued in connection with note exchange (in units) |  | 14,200,422 |  |  |  |
Common units to be distributed by acquiree to its unitholders (in units) |  |  |  |  |  | 14,058,418
Repayments of lines of credit |  |  | 61,700 | 0 | 0 |
Total new common units issued as part of an acquisition |  | 590,027 |  |  |  |
Total common units retained by the acquiree |  | 5,942 |  |  |  |
Total common units retained by the acquiree (in units) |  | 142,004 |  |  |  |
Cash paid by acquiree to Partnership, net of amounts owed to acquiree by Partnership |  | 23,916 |  |  |  |
Number of common units sold (in units) | 6,300,000 |  |  |  |  |
Estimated property, plant and equipment decreased |  | 33,302 |  |  |  |
Estimated intangible assets (principally customer relationships) increased |  | 39,583 |  |  |  |
Estimated other current assets decreased |  | 765 |  |  |  |
Estimated other noncurrent liabilities increased |  | 646 |  |  |  |
Net effect of adjustments |  | 4,870 |  |  |  |
Decrease in annual depreciation expense |  |  |  |  | 205 |
Increase in annual amortization expense |  |  |  |  | 1,449 |
Unaudited pro forma combined financial information [Abstract] |  |  |  |  |  |
Revenues |  |  |  |  | 1,842,698 |
Net income |  |  |  |  | 12,824 |
Income per common unit [Abstract] |  |  |  |  |  |
Basic (in dollars per unit) |  |  |  |  | $ 0.23 |
Diluted (in dollars per unit) |  |  |  |  | $ 0.23 |
Customer relationships [Member] |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Estimated useful life |  | 9 years |  |  |  |
Non-compete agreements [Member] |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Estimated useful life |  | 6 years |  |  |  |
Other intangible assets [Member] |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Estimated useful life |  | 4 years |  |  |  |
Inergy Notes [Member] |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Aggregate principal amount |  | 1,200,000 |  |  |  |
Inergy Senior Notes due 2018 [Member] |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Stated interest rate (in hundredths) |  | 7.00% |  |  |  |
Year of maturity of debt instrument |  | 2018 |  |  |  |
Outstanding principal amount for which tenders and consents had been received (in hundredths) |  | 98.09% |  |  |  |
Inergy Senior Notes due 2021 [Member] |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Stated interest rate (in hundredths) |  | 6.875% |  |  |  |
Year of maturity of debt instrument |  | 2021 |  |  |  |
Outstanding principal amount for which tenders and consents had been received (in hundredths) |  | 99.74% |  |  |  |
SPH Notes [Member] |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Aggregate amount of newly issued SPH notes |  | 1,075,043 |  |  |  |
Aggregate par value of notes |  | 1,000,000 |  |  |  |
SPH Senior Notes due 2018 [Member] |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Stated interest rate (in hundredths) |  | 7.50% |  |  |  |
Year of maturity of debt instrument |  | 2018 |  |  |  |
SPH Senior Notes due 2021 [Member] |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Stated interest rate (in hundredths) |  | 7.375% |  |  |  |
Year of maturity of debt instrument |  | 2021 |  |  |  |
364-Day Facility [Member] | Amended Credit Agreement [Member] |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Maximum borrowing capacity |  | 250,000 |  |  |  |
Term of facility |  | 364 days |  |  |  |
Amount drawn on facility |  | 225,000 |  |  |  |
Repayments of lines of credit | 225,000 |  |  |  |  |
Revolving Credit Facility [Member] | Amended Credit Agreement [Member] |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |
Maximum borrowing capacity |  | $ 400,000 | $ 400,000 |  |  |

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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The number of units sold in a public offering of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 16 -Subparagraph a, b -Article 6 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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