Consolidated Statements of Common Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended																12 Months Ended
	May. 31, 2015	[1]	Feb. 22, 2015	[1]	Nov. 23, 2014	[1]	Aug. 24, 2014	[1]	May. 25, 2014	[1]	Feb. 23, 2014	[1]	Nov. 24, 2013	[1]	Aug. 25, 2013	[1]	May. 31, 2015	May. 25, 2014	May. 26, 2013
Statement of Stockholders' Equity [Abstract]
Dividends declared on common stock (in dollars per share)	$ 0.25		$ 0.25		$ 0.25		$ 0.25		$ 0.25		$ 0.25		$ 0.25		$ 0.25		$ 1.00	$ 1.00	$ 0.99

[1] Basic and diluted earnings per share are calculated independently for each of the quarters presented. Accordingly, the sum of the quarterly earnings per share amounts may not agree with the total year.