Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Aug. 30, 2020	May 31, 2020
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2.5	$ 2.6
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)	584,219,229	584,219,229
Treasury stock, at cost (in shares)	95,701,156	97,057,311