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INVESTMENTS IN JOINT VENTURES - Variable Interest Entity - Not Consolidated (Details) - USD ($)
$ in Millions
12 Months Ended
May 27, 2018
May 28, 2017
May 29, 2016
May 31, 2015
Investments in Joint Ventures        
Equity method investments $ 219.8 $ 178.6    
Stockholders' equity $ (334.8) (647.2) $ 1,400.6 $ 1,357.5
Lamb Weston RDO        
Investments in Joint Ventures        
Ownership interest (as a percent) 50.00%      
Equity method investments $ 18.0 17.2    
Selling, general and administrative | Lamb Weston RDO        
Investments in Joint Ventures        
Fees received 14.4 13.9 $ 13.2  
Lamb Weston RDO        
Investments in Joint Ventures        
Stockholders' equity 36.0 34.4    
Term borrowings from banks $ 57.2 $ 59.3