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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Marketing Costs, Research and Development, and Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
12 Months Ended
May 28, 2017
May 29, 2016
May 31, 2015
Advertising and Promotion      
Advertising and promotion expenses $ 22.6 $ 25.6 $ 19.4
Research and Development      
Research and development costs 10.6 6.7 $ 7.2
Cash and Cash Equivalents      
Cash equivalents 57.1 36.4  
Cash 35.1 33.6  
Trade Accounts Receivable and Allowance for Doubtful Accounts      
Receivables, allowance for doubtful accounts $ 0.5 $ 0.5