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Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Millions | Feb. 27, 2016 | May. 30, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Unrealized Gain | $ 0.0 | $ 0.0
Unrealized Loss | 0.0 | 0.0
Market Value | 7.3 | 5.7
Cost | 7.3 | 5.7
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Unrealized Gain |  | 0.0
Unrealized Loss |  | 0.0
Market Value |  | 0.2
Cost |  | 0.2
Corporate Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Unrealized Gain |  | 0.0
Unrealized Loss |  | 0.0
Market Value |  | 0.6
Cost |  | 0.6
US Treasury and Government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Unrealized Gain | 0.0 | 0.0
Unrealized Loss | 0.0 | 0.0
Market Value | 0.4 | 4.4
Cost | 0.4 | 4.4
Collateralized Mortgage Backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Unrealized Gain |  | 0.0
Unrealized Loss |  | 0.0
Market Value |  | 0.5
Cost |  | $ 0.5
Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Unrealized Gain | 0.0 |
Unrealized Loss | 0.0 |
Market Value | 6.9 |
Cost | $ 6.9 |

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