Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Millions	Dec. 02, 2017	Jun. 03, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost	$ 8.4	$ 8.5
Unrealized Gain/(loss)	0.1	0.1
Market Value	8.5	8.6
Fixed Income Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost	7.6	7.6
Unrealized Gain/(loss)	0.0	0.1
Market Value	7.6	7.7
Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost	0.8	0.9
Unrealized Gain/(loss)	0.1	0.0
Market Value	$ 0.9	$ 0.9