PENSION AND POSTRETIREMENT BENEFITS (Weighted-Average Actuarial Assumptions) (Details)	12 Months Ended
	May. 31, 2015	May. 25, 2014	May. 26, 2013
Pension Benefits
Weighted Average Actuarial Assumption Used to Determine Net Expense
Discount rate	4.20%	4.10%	4.50%
Long-term rate of return on plan assets	7.80%	7.80%	7.80%
Long-term rate of compensation increase	4.30%	4.30%	4.30%
Other Benefits
Weighted Average Actuarial Assumption Used to Determine Net Expense
Discount rate	3.70%	3.40%	3.90%