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Acquisition of Inergy Propane (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended |  |  | 0 Months Ended |  |  |  |  |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended |  | 0 Months Ended | 12 Months Ended
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Aug. 14, 2012 | Sep. 29, 2012 | Sep. 24, 2011 | Sep. 25, 2010 | Aug. 01, 2012 | Aug. 01, 2012 364-Day Facility [Member] | Sep. 29, 2012 Amended Credit Agreement [Member] | Aug. 14, 2012 Amended Credit Agreement [Member] 364-Day Facility [Member] | Sep. 29, 2012 Amended Credit Agreement [Member] 364-Day Facility [Member] | Aug. 01, 2012 Amended Credit Agreement [Member] 364-Day Facility [Member] | Sep. 29, 2012 Amended Credit Agreement [Member] Revolving Credit Facility [Member] | Aug. 01, 2012 Amended Credit Agreement [Member] Revolving Credit Facility [Member] | Jul. 31, 2012 Amended Credit Agreement [Member] Revolving Credit Facility [Member] | Aug. 01, 2012 Inergy Propane [Member] | Sep. 29, 2012 Inergy Propane [Member] | Sep. 30, 2011 Inergy Propane [Member] gal | Sep. 24, 2011 Inergy Propane [Member] | Aug. 01, 2012 Inergy Propane [Member] Inergy Notes [Member] | Aug. 01, 2012 Inergy Propane [Member] Inergy Senior Notes due 2018 [Member] | Aug. 01, 2012 Inergy Propane [Member] Inergy Senior Notes due 2021 [Member] | Aug. 01, 2012 Inergy Propane [Member] SPH Notes [Member] | Aug. 01, 2012 Inergy Propane [Member] SPH Senior Notes due 2018 [Member] | Aug. 01, 2012 Inergy Propane [Member] SPH Senior Notes due 2021 [Member] | Sep. 29, 2012 Customer relationships [Member] Inergy Propane [Member] | Sep. 29, 2012 Tradenames [Member] Inergy Propane [Member] | Sep. 29, 2012 Non-compete agreements [Member] Inergy Propane [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | 250,000 | 250,000 | 400,000 | 400,000 | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Term Of Facility |  |  |  |  |  | 364 days |  |  |  | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn on facility |  |  |  |  |  |  | 225,000 |  |  | 225,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of lines of credit |  |  |  |  |  |  |  | 225,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total acquisition value |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,890,915 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of newly issued SPH notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,075,043 |  |  |  |  |
Aggregate par value of notes |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,964 |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,076 |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,457 |  |  |  |  |  |  |  |  |  |  |  |
Other current assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,832 |  |  |  |  |  |  |  |  |  |  |  |
Current assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,329 |  |  |  |  |  |  |  |  |  |  |  |
Property, plant & equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 651,156 |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships (estimated useful life of 10 years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 402,950 |  |  |  |  |  |  |  |  |  |  |  |
Tradenames (estimated useful life of 4 years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,100 |  |  |  |  |  |  |  |  |  |  |  |
Non-compete agreements (estimated useful life of 6 years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,909 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | 814,648 |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,151 |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,976,243 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,081) |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  | (85,328) |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,890,915 |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 4 | 6
Acquisition-related costs |  | 17,916 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Unaudited pro forma combined financial information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,842,698 |  | 2,242,876 |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,288 |  | 123,751 |  |  |  |  |  |  |  |  |
Income per common unit [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per unit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.36 |  | $ 2.21 |  |  |  |  |  |  |  |  |
Diluted (in dollars per unit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.36 |  | $ 2.20 |  |  |  |  |  |  |  |  |
Impact of Change in Provisional Fair Value [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in provisional fair value, assumption used (in hundredths) |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential decrease in goodwill (in hundredths) |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential increase in annual depreciation expense |  |  |  |  | 4,359 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential increase in annual amortization expense |  |  |  |  | 4,791 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in provisional fair value, assumption used (in hundredths) |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential increase in goodwill (in hundredths) |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential decrease in annual depreciation expense |  |  |  |  | 3,293 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential decrease in annual amortization expense |  |  |  |  | $ 4,279 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate amount of cash consent payments provided under the Contribution Agreement in connection with the exchange of notes pursuant to a business combination. + References No definition available. + Details
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- Definition The aggregate par value of newly issued debt instruments as of the date of issuance. + References No definition available. + Details
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- Definition The average of the high and low sales prices of the Partnership's common units for a specified number of consecutive trading days ending on the day prior to the execution of the Contribution Agreement. + References No definition available. + Details
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- Definition The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination. + References No definition available. + Details
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- Details
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- Definition The amount of acquisition cost of a business combination allocated to customer deposits and deferred revenue of the acquired entity. + References No definition available. + Details
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- Definition The amount of acquisition cost of a business combination allocated to customer relationships that will be amortized. + References No definition available. + Details
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- Details
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- Definition The amount of acquisition cost of a business combination allocated to non-compete agreements that will be amortized. + References No definition available. + Details
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- Definition The amount of acquisition cost of a business combination allocated to trade names that will be amortized. + References No definition available. + Details
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- Definition The cash due to the tendering noteholders of the acquiree's notes in connection with the exchange of notes. + References No definition available. + Details
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- Definition Cash to by paid by the acquiree in a business combination to the Partnership pursuant to the Contribution Agreement. + References No definition available. + Details
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- Definition Cash to by paid by the acquiree in a business combination to the Partnership, net of amounts owed to acquiree by Partnership, pursuant to the Contribution Agreement. + References No definition available. + Details
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- Definition The common units issued by the Partnership to the acquiree in satisfaction of cash consideration due to the acquiree in connection with the note exchange. + References No definition available. + Details
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- Definition The number of common units of the Partnership that the acquiree will subsequently distribute to its unitholders. + References No definition available. + Details
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- Definition Year when the debt instrument is scheduled to be fully repaid. + References No definition available. + Details
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- Definition The volume of fuel oil and refined fuels sold by the acquiree in the fiscal year prior to the business combination. + References No definition available. + Details
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- Definition The decrease in annual amortization expense that could result from a decrease in the provisional fair values of tangible and intangible assets acquired. + References No definition available. + Details
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- Definition The decrease in annual depreciation expense that could result from a decrease in the provisional fair values of tangible and intangible assets acquired. + References No definition available. + Details
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- Definition The percentage increase in goodwill that could result from a decrease in the provisional fair values of tangible and intangible assets acquired. + References No definition available. + Details
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- Definition The percentage decrease used to determine the potential impact from a decrease in the provisional fair values of tangible and intangible assets acquired. + References No definition available. + Details
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- Definition The increase in annual amortization expense that could result from an increase in the provisional fair values of tangible and intangible assets acquired. + References No definition available. + Details
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- Definition The increase in annual depreciation expense that could result from an increase in the provisional fair values of tangible and intangible assets acquired. + References No definition available. + Details
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- Definition The percentage decrease in goodwill that could result from an increase in the provisional fair values of tangible and intangible assets acquired. + References No definition available. + Details
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- Definition The percentage increase used to determine the potential impact from an increase in the provisional fair values of tangible and intangible assets acquired. + References No definition available. + Details
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- Definition The number of states in which the acquiree had retail customers as of the date of acquisition. + References No definition available. + Details
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- Definition The number of trading days ending on the day prior to the execution of the Contribution Agreement used to determine the average of the high and low sales prices of the Partnership's common units, which was used to determine the number of common units to be issued pursuant to the Contribution Agreement. + References No definition available. + Details
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- Definition The percentage of the total outstanding principal amount of exchanged notes for which the Partnership had received tenders and consents from holders. + References No definition available. + Details
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- Definition The volume of propane sold by the acquiree in the fiscal year prior to the business combination. + References No definition available. + Details
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- Definition The period of time for which the facility is available for use. + References No definition available. + Details
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- Definition The total common units of the Partnership issued to the acquiree in connection with the business combination, including shares issued to satisfy certain cash consideration requirements in connection with the exchange of outstanding notes. + References No definition available. + Details
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- Definition The number of common units of the Partnership that will be retained by the acquiree after distribution of common units to its unitholders. + References No definition available. + Details
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- Definition The amount of acquisition cost of a business combination allocated to inventory, including finished goods, work-in-process, and raw materials. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph c -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. + Details
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- Definition The amount of acquisition cost of a business combination allocated to accounts payable of the acquired entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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. + Details
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- Definition Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 52 -Subparagraph c -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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 53 -Subparagraph d -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. + Details
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- Definition The amount of acquisition cost of a business combination allocated to noncurrent assets of the acquired entity, except for property plant and equipment, intangible assets, and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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 FASB -Name Emerging Issues Task Force (EITF) -Number 98-1 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph f -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. + Details
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