Consolidated Statements of Changes In Stockholders' Equity (Unaudited) (Parenthetical) - shares shares in Millions	9 Months Ended
	Feb. 28, 2016	Feb. 22, 2015
Statement of Stockholders' Equity [Abstract]
Stock option exercised, shares	1.9	2.8
Repurchases of common stock, shares	2.3	10.0
Issuance of treasury stock under Employee Stock Purchase Plan and other plans, shares	0.2	0.1