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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 0 Months Ended
Aug. 14, 2012
Aug. 01, 2012
Sep. 29, 2012
Sep. 24, 2011
Aug. 01, 2012
Customer relationships [Member]
Aug. 01, 2012
Non-compete agreements [Member]
Aug. 01, 2012
Other intangible assets [Member]
Aug. 01, 2012
Inergy Notes [Member]
Aug. 01, 2012
Inergy Senior Notes due 2018 [Member]
Aug. 01, 2012
Inergy Senior Notes due 2021 [Member]
Aug. 01, 2012
SPH Notes [Member]
Aug. 01, 2012
SPH Senior Notes due 2018 [Member]
Aug. 01, 2012
SPH Senior Notes due 2021 [Member]
Aug. 14, 2012
364-Day Facility [Member]
Amended Credit Agreement [Member]
Aug. 01, 2012
364-Day Facility [Member]
Amended Credit Agreement [Member]
Sep. 28, 2013
Revolving Credit Facility [Member]
Amended Credit Agreement [Member]
Aug. 01, 2012
Revolving Credit Facility [Member]
Amended Credit Agreement [Member]
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   445,500                              
Non-compete agreements   23,059                              
Other intangible assets   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                              
Estimated useful life         9 years 6 years 4 years                    
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                  
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                             250,000 400,000 400,000
Term of facility                             364 days    
Amount drawn on facility                             225,000    
Repayments of lines of credit                           225,000      
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                                
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 2,242,876                          
Net (loss) income     $ 12,824 $ 116,287                          
(Loss) income per Common Unit                                  
Basic (in dollars per unit)     $ 0.23 $ 2.08                          
Diluted (in dollars per unit)     $ 0.23 $ 2.07