SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Balances of Allowance for Doubtful Accounts and Changes Therein (Details) - Allowance for doubtful receivables - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 26, 2019	May 27, 2018
Movement in Valuation Allowances and Reserves
Balance at Beginning of Period	$ 2.2	$ 1.7	$ 2.9
Additions Charged to Costs and Expenses	1.2	0.6	0.8
Other	0.1	0.5
Deductions from Reserves	0.9	0.6	2.0
Balance at Close of Period	$ 2.6	$ 2.2	$ 1.7