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Distributions of Available Cash (Details) (USD $)
 3 Months Ended
Dec. 27, 2014
Quarter
Distributions of Available Cash [Abstract]  
Distributions to its partners 45 days
Number of quarters 4sph_NumberOfQuarters
Declaration date of quarterly distribution Jan. 22, 2015
Distributions paid (in dollars per unit) $ 0.8750us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit
Common Unit distribution on an annualized basis (in dollars per unit) $ 3.50sph_DistributionMadeToMemberOrLimitedPartnerDistributionsDeclaredPerUnitAnnualizedBasis
Distribution date of quarterly distribution Feb. 10, 2015
Date of record of quarterly distribution Feb. 03, 2015