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INVESTMENTS IN JOINT VENTURES - Equity Method Investments - General Information (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2020
Oct. 15, 2019
May 26, 2019
Equity Method Investments      
Equity method investments $ 250.2   $ 224.6
Lamb-Weston Meijer v.o.f.      
Equity Method Investments      
Ownership interest (as a percent) 50.00%    
Equity method investments $ 207.4   205.8
Lamb-Weston RDO Frozen      
Equity Method Investments      
Ownership interest (as a percent) 50.00%    
Equity method investments $ 15.4   $ 17.8
Lamb Weston Alimentos Modernos S.A.      
Equity Method Investments      
Ownership interest (as a percent)   50.00%  
Equity method investments   $ 27.3  
Investment in equity method joint venture 22.6    
Investment in equity method joint venture, payable   $ 4.7  
Equity method investments, basis difference $ 4.8