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Partnership Organization and Formation (Details)
Dec. 27, 2014
Sep. 27, 2014
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]    
Common Units outstanding (in units) 60,457,780us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 60,317,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Percentage of wholly-owned subsidiary (in hundredths) 100.00%sph_PercentageOfWhollyOwnedSubsidiary  
General Partner [Member] | Common Unitholders [Member]    
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]    
Common Units outstanding (in units) 784us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ dei_LegalEntityAxis
= us-gaap_GeneralPartnerMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember