Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Aug. 24, 2014	May 25, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4.5	$ 4.0
Common stock, par value	$ 5	$ 5
Common stock, authorized	1,200,000,000	1,200,000,000
Common stock, issued	567,907,172	567,907,172
Treasury stock, common shares	143,079,632	145,992,121