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, unless otherwise specified	6 Months Ended
	Nov. 23, 2014	Nov. 24, 2013
Stock Plans [Abstract]
Net cash proceeds	$ 35.9	$ 27.5
Intrinsic value of options exercised	$ 40.1	$ 71.0