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Fair Value of Financial Assets - Schedule of Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Millions
Jun. 02, 2018
Jun. 03, 2017
Gain (Loss) on Investments    
Cost $ 8.5 $ 8.5
Unrealized Gain 0.2 0.1
Unrealized Loss 0.1 0.0
Market Value 8.6 8.6
Mutual funds - fixed income    
Gain (Loss) on Investments    
Cost 7.8 7.6
Unrealized Gain 0.0 0.1
Unrealized Loss 0.1 0.0
Market Value 7.7 7.7
Mutual funds - equity    
Gain (Loss) on Investments    
Cost 0.7 0.9
Unrealized Gain 0.2 0.0
Unrealized Loss 0.0 0.0
Market Value $ 0.9 $ 0.9