STOCK-BASED COMPENSATION - Unrecognized Compensation Expense, Net of Estimated Forfeitures (Details) $ in Millions	3 Months Ended
	Aug. 25, 2019 USD ($)
Unrecognized compensation expense, net of estimated forfeitures
Unrecognized Compensation Expense	$ 42.7
Remaining Weighted Average Recognition Period (in years)	2 years 2 months 12 days
Stock-settled restricted stock units
Unrecognized compensation expense, net of estimated forfeitures
Unrecognized Compensation Expense	$ 25.5
Remaining Weighted Average Recognition Period (in years)	2 years 3 months 18 days
Performance shares
Unrecognized compensation expense, net of estimated forfeitures
Unrecognized Compensation Expense	$ 17.2
Remaining Weighted Average Recognition Period (in years)	2 years