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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
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