Fair Value Measurements (Fair Values Of Financial Instruments Measured At Fair Value On Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Aug. 27, 2017	May 28, 2017
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	$ 3.4	$ 3.7
Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.2	(0.4)
Corporate bonds
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	0.9	1.1
U.S. Treasury securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	1.3	2.0
Mortgage-backed securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	1.0	1.0
Quoted prices in active market for identical assets (liabilities) (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	1.3	2.0
Quoted prices in active market for identical assets (liabilities) (Level 1) | Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0	0.0
Quoted prices in active market for identical assets (liabilities) (Level 1) | Corporate bonds
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	0.0	0.0
Quoted prices in active market for identical assets (liabilities) (Level 1) | U.S. Treasury securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	1.3	2.0
Quoted prices in active market for identical assets (liabilities) (Level 1) | Mortgage-backed securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	0.0	0.0
Significant other observable inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	2.1	1.7
Significant other observable inputs (Level 2) | Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.2	(0.4)
Significant other observable inputs (Level 2) | Corporate bonds
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	0.9	1.1
Significant other observable inputs (Level 2) | U.S. Treasury securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	0.0	0.0
Significant other observable inputs (Level 2) | Mortgage-backed securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	1.0	1.0
Significant unobservable inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	0.0	0.0
Significant unobservable inputs (Level 3) | Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0	0.0
Significant unobservable inputs (Level 3) | Corporate bonds
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	0.0	0.0
Significant unobservable inputs (Level 3) | U.S. Treasury securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	0.0	0.0
Significant unobservable inputs (Level 3) | Mortgage-backed securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities	$ 0.0	$ 0.0