Consolidated Statements Of Changes In Stockholders' Equity (Unaudited) (USD $) In Millions, unless otherwise specified	Total	Common Stock And Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Unearned Compensation
Balances at May. 26, 2013	$ 2,059.5	$ 1,207.6	$ 998.9	$ (8.1)	$ (132.8)	$ (6.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	70.2		70.2
Other comprehensive income (loss)	(1.6)				(1.6)
Dividends declared	(72.0)		(72.0)
Stock option exercises (2015: .2 shares and 2014: .2 shares)	6.4	6.2		0.2
Stock-based compensation	5.7	5.7
ESOP note receivable repayments	0.3					0.3
Income tax benefits credited to equity	1.6	1.6
Repurchases of common stock (0.0 shares in 2015 and 2014)	(0.4)	(0.1)	(0.3)
Issuance of stock under Employee Stock Purchase Plan and other plans (0.0 shares in 2015 and 2014)	1.8	1.8
Balances at Aug. 25, 2013	2,071.5	1,222.8	996.8	(7.9)	(134.4)	(5.8)
Balances at May. 25, 2014	2,156.9	1,302.2	995.8	(7.8)	(128.1)	(5.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	503.2		503.2
Other comprehensive income (loss)	25.6				25.6
Dividends declared	(72.4)		(72.4)
Stock option exercises (2015: .2 shares and 2014: .2 shares)	7.7	7.7
Stock-based compensation	4.6	4.6
ESOP note receivable repayments	0.3					0.3
Income tax benefits credited to equity	1.0	1.0
Repurchases of common stock (0.0 shares in 2015 and 2014)	(0.6)	(0.1)	(0.5)
Issuance of stock under Employee Stock Purchase Plan and other plans (0.0 shares in 2015 and 2014)	1.6	1.6
Accelerated share repurchase program	(500.0)	(500.0)
Balances at Aug. 24, 2014	$ 2,127.9	$ 817.0	$ 1,426.1	$ (7.8)	$ (102.5)	$ (4.9)