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Fair Value Measurements - Fair Value Hierarchy (Details) (Fair Value, Inputs, Level 2, Fair Value, Measurements, Recurring, USD $)
In Millions, unless otherwise specified
Nov. 29, 2014
May 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Deferred Compensation Plan Fair Value Disclosure $ 7.2us-gaap_DeferredCompensationPlanAssets $ 6.3us-gaap_DeferredCompensationPlanAssets
Assets, Fair Value Disclosure 14.2us-gaap_AssetsFairValueDisclosure 17.6us-gaap_AssetsFairValueDisclosure
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0.3us-gaap_LiabilitiesFairValueDisclosure 0.1us-gaap_LiabilitiesFairValueDisclosure
Foreign Exchange Forward
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Foreign Currency Contract, Asset, Fair Value Disclosure 0.4us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
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Foreign Currency Contracts, Liability, Fair Value Disclosure 0.3us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
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Asset-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale marketable securities 0.3us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Corporate Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale marketable securities 0.8us-gaap_AvailableForSaleSecurities
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US Treasury and Government
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale marketable securities 4.9us-gaap_AvailableForSaleSecurities
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= us-gaap_USTreasuryAndGovernmentMember		 7.9us-gaap_AvailableForSaleSecurities
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Collateralized Mortgage Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale marketable securities $ 0.6us-gaap_AvailableForSaleSecurities
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= us-gaap_MortgageBackedSecuritiesMember		 $ 1.6us-gaap_AvailableForSaleSecurities
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