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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
Aug. 30, 2014
May 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Deferred Compensation Plan Fair Value Disclosure $ 6.9 $ 6.3
Assets, Fair Value Disclosure 18.1 17.6
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0.1 0.1
Foreign Exchange Forward
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Foreign Currency Contract, Asset, Fair Value Disclosure 0.3 0.2
Foreign Currency Contracts, Liability, Fair Value Disclosure 0.1 0.1
Asset-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale marketable securities 0.4 0.4
Corporate Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale marketable securities 1.0 1.2
US Treasury and Government
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale marketable securities 7.9 7.9
Collateralized Mortgage Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale marketable securities $ 1.6 $ 1.6