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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