SHARE-BASED PAYMENTS (Black-Scholes Option Pricing for Stock Options) (Details)	12 Months Ended
	May. 31, 2015	May. 25, 2014	May. 26, 2013
Weighted average Black-Scholes assumptions for stock options granted
Expected volatility (%)	17.45%	21.13%	22.95%
Dividend yield (%)	3.10%	3.24%	3.77%
Risk-free interest rates (%)	1.58%	1.37%	0.57%
Expected life of stock option (years)	4 years 11 months 1 day	4 years 10 months 29 days	4 years 9 months 18 days