Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares shares in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 23, 2020	Feb. 28, 2021	Feb. 23, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared (in dollars per share)	$ 0.37	$ 0.88	$ 0.67	$ 2.64
Stock options exercised (in shares)	0.4	0.1	0.5	0.3
Repurchases of common stock (in shares)	0.0	0.6	0.1	2.6
Issuance of stock under Employee Stock Purchase Plan and other plans (in shares)	0.0	0.0	0.1	0.1