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Multiemployer Employee Benefit Plans (Details) (Multiemployer Defined Benefit Pension Plans [Member], USD $)
6 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Jun. 28, 2014
Multiemployer Plans [Line Items]      
Approximate percentage of union representatives on the boards of multiemployer plans 50.00%syy_PercentageOfUnionRepresentativesOnMultiemployerBoardsOfTrustees    
Approximate percentage of contributing employer representatives on the boards of multiemployer plans 50.00%syy_PercentageOfContributingEmployerRepresentativesOnMultiemployerBoardsOfTrustees    
Provisions recorded for multiemployer pension withdrawal liabilities $ 0syy_MultiemployerPlansWithdrawalObligationProvisionRecorded $ 1,500,000syy_MultiemployerPlansWithdrawalObligationProvisionRecorded  
Recorded multiemployer pension withdrawal liability 0us-gaap_MultiemployerPlansWithdrawalObligation 1,500,000us-gaap_MultiemployerPlansWithdrawalObligation 1,400,000us-gaap_MultiemployerPlansWithdrawalObligation
Aggregate Multiemployer Plan Withdrawal Liability [Member]
     
Multiemployer Plans [Line Items]      
Tax rate for potential IRS non-deductible excise tax 5.00%syy_IrsExciseTaxRate
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_WithdrawalFromMultiemployerDefinedBenefitPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
   
Statutory period for company exposure to additional liability after voluntary withdrawal from a multiemployer plan 2 years    
Loss contingency, estimate of possible loss $ 90,000,000us-gaap_LossContingencyEstimateOfPossibleLoss
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_WithdrawalFromMultiemployerDefinedBenefitPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember