XML 24 R48.htm IDEA: XBRL DOCUMENT v2.4.0.8
Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) (USD $)
In Millions, unless otherwise specified
Aug. 30, 2014
May 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cost $ 10.9 $ 11.1
Unrealized Gain 0 0
Unrealized Loss 0 0
Market Value 10.9 11.1
Asset-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cost 0.4 0.4
Unrealized Gain 0 0
Unrealized Loss 0 0
Market Value 0.4 0.4
Corporate Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cost 1.0 1.2
Unrealized Gain 0 0
Unrealized Loss 0 0
Market Value 1.0 1.2
US Treasury and Government
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cost 7.9 7.9
Unrealized Gain 0 0
Unrealized Loss 0 0
Market Value 7.9 7.9
Collateralized Mortgage Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cost 1.6 1.6
Unrealized Gain 0 0
Unrealized Loss 0 0
Market Value $ 1.6 $ 1.6