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Basis of Presentation (Details)
3 Months Ended
Dec. 27, 2014
Week
Basis of Presentation [Abstract]  
Limited partner interest in the Operating Partnership (in hundredths) 100.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Minimum number of weeks in the fiscal year reporting calendar 52sph_MinimumNumberOfWeeksInFiscalYearReportingCalendar
Maximum number of weeks in the fiscal year reporting calendar 53sph_MaximumNumberOfWeeksInFiscalYearReportingCalendar
Minimum number of weeks in a fiscal quarter 13sph_MinimumNumberOfWeeksInFiscalQuarter
Maximum number of weeks in a fiscal quarter 14sph_MaximumNumberOfWeeksInFiscalQuarter