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 26, 2019	May 27, 2018	May 28, 2017
Movement in Valuation Allowances and Reserves
Balance at Beginning of Period	$ 1.7	$ 2.9	$ 3.0
Additions Charged to Costs and Expenses	0.6	0.8	1.0
Other	1.6	0.0	0.0
Deductions from Reserves	0.6	2.0	1.1
Balance at Close of Period	$ 3.3	$ 1.7	$ 2.9