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INVESTMENTS IN JOINT VENTURES - Variable Interest Entity - Not Consolidated (Details) - USD ($)
$ in Millions
12 Months Ended
May 28, 2017
May 29, 2016
May 31, 2015
May 25, 2014
Variable Interest Entity [Line Items]        
Equity method investments $ 178.6 $ 155.2    
Stockholders' equity $ (647.2) 1,400.6 $ 1,357.5 $ 1,265.0
Lamb Weston RDO        
Variable Interest Entity [Line Items]        
Ownership interest (as a percent) 50.00%      
Equity method investments $ 17.2 16.9    
Selling, general and administrative | Lamb Weston RDO        
Variable Interest Entity [Line Items]        
Fees received 13.9 13.2 $ 11.7  
Lamb Weston RDO        
Variable Interest Entity [Line Items]        
Stockholders' equity 34.4 33.9    
Term borrowings from banks $ 59.3 $ 41.1