Consolidated Statements of Changes In Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock And Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Unearned Compensation
Beginning balance at May. 31, 2015	$ 2,333.5	$ 1,405.9	$ 1,026.0	$ (7.8)	$ (86.6)	$ (4.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	86.4		86.4
Other comprehensive income	1.4				1.4
Dividends declared	(70.1)		(70.1)
Stock option exercises (0.1, 1.5 shares)	55.7	55.7
Stock-based compensation	4.1	4.1
ESOP note receivable repayments	0.3					0.3
Income tax benefits credited to equity	11.6	11.6
Issuance of stock under Employee Stock Purchase Plan and other plans (0.0 shares)	1.2	1.2
Ending balance at Aug. 30, 2015	2,424.1	1,478.5	1,042.3	(7.8)	(85.2)	(3.7)
Beginning balance at May. 29, 2016	1,952.0	1,502.6	547.5	(7.8)	(87.0)	(3.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	110.2		110.2
Other comprehensive income	(2.4)				(2.4)
Dividends declared	(70.5)		(70.5)
Stock option exercises (0.1, 1.5 shares)	2.1	2.1
Stock-based compensation	3.6	3.6
ESOP note receivable repayments	0.1					0.1
Income tax benefits credited to equity	0.6	0.6
Repurchases of common stock (3.2, 0.0 shares)	(195.6)	(37.7)	(157.9)
Issuance of stock under Employee Stock Purchase Plan and other plans (0.0 shares)	1.2	1.2
Ending balance at Aug. 28, 2016	$ 1,801.3	$ 1,472.4	$ 429.3	$ (7.8)	$ (89.4)	$ (3.2)