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Distributions of Available Cash (Details) (USD $)
6 Months Ended
Mar. 28, 2015
Quarter
Distributions of Available Cash [Abstract]  
Distributions to its partners 45 days
Number of quarters 4sph_NumberOfQuarters
Declaration date of quarterly distribution Apr. 23, 2015
Distributions paid (in dollars per unit) $ 0.8875us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit
Common Unit distribution on an annualized basis (in dollars per unit) $ 3.55sph_DistributionMadeToMemberOrLimitedPartnerDistributionsDeclaredPerUnitAnnualizedBasis
Distribution date of quarterly distribution May 12, 2015
Date of record of quarterly distribution May 05, 2015
Annualized distribution increase (in dollars per unit) $ 0.05sph_DistributionMadeToLimitedLiabilityCompanyLLCMemberIncreaseInAnnualizedDistributionsPaidPerUnit
Annualized distribution increase percentage (in hundredths) 1.40%sph_DistributionMadeToLimitedLiabilityCompanyLLCMemberPercentageIncreaseInAnnualizedDistributionsPaidPerUnit