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Subsequent Events (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  |  |
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Aug. 01, 2012 Acquisition [Member] Inergy Propane LLC [Member] | Jun. 23, 2012 Acquisition [Member] Inergy Propane LLC [Member] | Jun. 25, 2011 Acquisition [Member] Inergy Propane LLC [Member] | Jun. 23, 2012 Acquisition [Member] Inergy Propane LLC [Member] | Jun. 25, 2011 Acquisition [Member] Inergy Propane LLC [Member] | Sep. 30, 2011 Acquisition [Member] Inergy Propane LLC [Member] gal | Aug. 01, 2012 Acquisition [Member] Inergy Propane LLC [Member] Inergy Notes [Member] | Aug. 01, 2012 Acquisition [Member] Inergy Propane LLC [Member] Inergy Senior Notes due 2018 [Member] | Aug. 01, 2012 Acquisition [Member] Inergy Propane LLC [Member] Inergy Senior Notes due 2021 [Member] | Aug. 01, 2012 Acquisition [Member] Inergy Propane LLC [Member] SPH Notes [Member] | Aug. 01, 2012 Acquisition [Member] Inergy Propane LLC [Member] SPH Senior Notes due 2018 [Member] | Aug. 01, 2012 Acquisition [Member] Inergy Propane LLC [Member] SPH Senior Notes due 2021 [Member] | Mar. 21, 2015 Financing [Member] Amended Credit Agreement [Member] | Aug. 01, 2012 Financing [Member] Amended Credit Agreement [Member] | Aug. 01, 2012 Financing [Member] Amended Credit Agreement [Member] Term Loan Facility [Member] | Aug. 01, 2012 Financing [Member] Amended Credit Agreement [Member] Revolving Credit Facility [Member] | Jul. 31, 2012 Financing [Member] Amended Credit Agreement [Member] Revolving Credit Facility [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New common units issued as part of an 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 an acquisition (in units) | 13,893 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (in hundredths) |  |  |  |  |  |  |  | 7.00% | 6.875% |  | 7.50% | 7.375% |  |  |  |  |
Year of maturity of debt instrument |  |  |  |  |  |  |  | 2018 | 2021 |  | 2018 | 2021 |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | 1,200,000 |  |  | 1,000,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount for which tenders and consents had been received (in hundredths) |  |  |  |  |  |  |  | 98.09% | 99.74% |  |  |  |  |  |  |  |
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) | 308 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total common units issued to acquiree, including units issued in connection with note exchange (in units) | 14,201 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units to be distributed by acquiree to its unitholders (in units) | 14,058 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total common units retained by the acquiree (in hundredths) | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total common units retained by the acquiree (in units) | 143 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 | 400,000 | 250,000
Term of facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 364 days |  |
Amount drawn on facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 225,000 |  |
Minimum consolidated interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  | 2.5 to 1.0 | 2.0 to 1.0 |  |  |
Maximum consolidated leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  | 4.75 to 1.0 | 7.0 to 1.0 |  |  |
Total acquisition value | 1,896,860 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of newly issued SPH notes |  |  |  |  |  |  |  |  |  | 1,075,043 |  |  |  |  |  |  |
Total new common units issued as part of an acquisition | 590,027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total common units retained by the acquiree | 5,942 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid by acquiree to Partnership, net of amounts owed to acquiree by Partnership | 17,971 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Propane sold by acquiree (in gallons) |  |  |  |  |  | 325,600 |  |  |  |  |  |  |  |  |  |  |
Fuel oil and refined fuels sold by acquiree (in gallons) |  |  |  |  |  | 39,000 |  |  |  |  |  |  |  |  |  |  |
Number of states in which the acquiree had retail customers | 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs of the Inergy Propane Acquisition |  |  |  |  | 15,750 |  |  |  |  |  |  |  |  |  |  |  |
Unaudited pro forma combined financial information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | 307,679 | 373,168 | 1,582,831 | 1,919,357 |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | $ (46,428) | $ (53,043) | $ 61,759 | $ 187,868 |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income per unit, basic (in dollars per share) |  | $ (0.93) | $ (1.07) | $ 1.24 | $ 3.78 |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income per unit, diluted (in dollars per share) |  | $ (0.93) | $ (1.07) | $ 1.24 | $ 3.76 |  |  |  |  |  |  |  |  |  |  |  |

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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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 Reference 3: 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 + Details
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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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