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Investments and Fair Value Measurements (Details 2) (Short-term investment, Tradings securities, USD $)
In Millions, unless otherwise specified
Dec. 27, 2014
Jun. 28, 2014
Trading securities related to deferred compensation plan    
Deferred compensation plan assets $ 4.0us-gaap_DeferredCompensationPlanAssets $ 3.9us-gaap_DeferredCompensationPlanAssets
Debt securities
    
Trading securities related to deferred compensation plan    
Deferred compensation plan assets 0.6us-gaap_DeferredCompensationPlanAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_TradingAccountAssetsMember		 0.4us-gaap_DeferredCompensationPlanAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_TradingAccountAssetsMember
Money market instruments and funds
    
Trading securities related to deferred compensation plan    
Deferred compensation plan assets 0.5us-gaap_DeferredCompensationPlanAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_TradingAccountAssetsMember		 0.7us-gaap_DeferredCompensationPlanAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_TradingAccountAssetsMember
Marketable equity investments
    
Trading securities related to deferred compensation plan    
Deferred compensation plan assets $ 2.9us-gaap_DeferredCompensationPlanAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_TradingAccountAssetsMember		 $ 2.8us-gaap_DeferredCompensationPlanAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_TradingAccountAssetsMember