Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	May 27, 2018	May 28, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2.0	$ 3.1
Common stock, par value (in dollars per share)	$ 5	$ 5
Common stock authorized (shares)	1,200,000,000	1,200,000,000
Common stock issued (shares)	567,907,172	567,907,172
Treasury stock, common shares (shares)	177,078,193	151,387,209