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Stock Plans (Schedule of net cash proceeds from the exercise of stock options less shares used for withholding taxes and the intrisic value of options exercised) (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 30, 2020
Aug. 25, 2019
Stock Plans [Abstract]    
Net cash proceeds $ 30.0 $ 55.8
Intrinsic value of options exercised $ 18.7 $ 30.2