PENSION AND POSTRETIREMENT BENEFITS - Weighted Average Actuarial Assumption Used to Determine Net Expense (Details)	12 Months Ended
	May 26, 2019	May 27, 2018	May 28, 2017
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.15%	3.90%	3.83%
Long-term rate of return on plan assets	5.17%	7.50%	7.50%
Long-term rate of compensation increase	3.63%	3.63%	3.66%
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	3.81%	3.33%	3.18%