STOCK-BASED COMPENSATION - Unrecognized Compensation Expense, Net of Estimated Forfeitures (Details) $ in Millions	12 Months Ended
	May 28, 2017 USD ($)
Unrecognized compensation expense, net of estimated forfeitures
Unrecognized Compensation Expense	$ 16.5
Remaining Weighted Average Recognition Period (in years)	1 year 9 months 18 days
Stock options
Unrecognized compensation expense, net of estimated forfeitures
Unrecognized Compensation Expense	$ 1.2
Remaining Weighted Average Recognition Period (in years)	1 year 7 months 6 days
Cash-settled restricted stock units
Unrecognized compensation expense, net of estimated forfeitures
Unrecognized Compensation Expense	$ 7.3
Remaining Weighted Average Recognition Period (in years)	1 year 8 months 12 days
Stock-settled restricted stock units
Unrecognized compensation expense, net of estimated forfeitures
Unrecognized Compensation Expense	$ 7.1
Remaining Weighted Average Recognition Period (in years)	2 years
Performance Units
Unrecognized compensation expense, net of estimated forfeitures
Unrecognized Compensation Expense	$ 0.9
Remaining Weighted Average Recognition Period (in years)	1 year 8 months 12 days