PENSION AND POSTRETIREMENT BENEFITS - Schedule of Pension Plan Weighted-Average Asset Allocations and Target Asset Allocations (Details)	May 31, 2020	May 26, 2019
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average Asset Allocations	100.00%	100.00%
Equity securities
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average Asset Allocations	6.00%	7.00%
Debt securities
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average Asset Allocations	85.00%	85.00%
Real estate funds
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average Asset Allocations	1.00%	1.00%
Private equity
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average Asset Allocations	3.00%	3.00%
Other
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average Asset Allocations	5.00%	4.00%