INCOME TAXES - Uncertain Tax Positions - Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 26, 2019	May 27, 2018
Uncertain Tax Positions
Beginning balance	$ 21.7	$ 13.2	$ 6.9
Decreases from positions established during prior fiscal years		(0.8)
Increases from positions established during current and prior fiscal years	10.3	10.4	7.9
Expiration of statute of limitations	(0.7)	(1.1)	(1.6)
Ending balance	$ 31.3	$ 21.7	$ 13.2