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Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Millions
Aug. 29, 2015
May. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cost $ 5.7 $ 5.7
Unrealized Gain 0.0 0.0
Unrealized Loss 0.0 0.0
Market Value 5.7 5.7
Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cost 0.2 0.2
Unrealized Gain 0.0 0.0
Unrealized Loss 0.0 0.0
Market Value 0.2 0.2
Corporate Debt Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cost 0.6 0.6
Unrealized Gain 0.0 0.0
Unrealized Loss 0.0 0.0
Market Value 0.6 0.6
US Treasury and Government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cost 4.4 4.4
Unrealized Gain 0.0 0.0
Unrealized Loss 0.0 0.0
Market Value 4.4 4.4
Collateralized Mortgage Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cost 0.5 0.5
Unrealized Gain 0.0 0.0
Unrealized Loss 0.0 0.0
Market Value $ 0.5 $ 0.5