Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Aug. 30, 2015	May. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4.4	$ 4.1
Common stock, par value (in dollars per share)	$ 5	$ 5
Common stock, authorized (in shares)	1,200,000,000	1,200,000,000
Common stock, issued (in shares)	567,907,172	567,907,172
Treasury stock, common shares (in shares)	134,995,978	139,702,605