STOCK-BASED COMPENSATION - Unrecognized Compensation Expense, Net of Estimated Forfeitures (Details) $ in Millions	6 Months Ended
	Nov. 24, 2019 USD ($)
Unrecognized compensation expense, net of estimated forfeitures
Unrecognized Compensation Expense	$ 39.1
Remaining Weighted Average Recognition Period (in years)	2 years
Stock-settled restricted stock units
Unrecognized compensation expense, net of estimated forfeitures
Unrecognized Compensation Expense	$ 22.7
Remaining Weighted Average Recognition Period (in years)	2 years 1 month 6 days
Performance shares
Unrecognized compensation expense, net of estimated forfeitures
Unrecognized Compensation Expense	$ 16.4
Remaining Weighted Average Recognition Period (in years)	1 year 10 months 24 days