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COMMITMENTS, CONTINGENCIES, GUARANTEES AND LEGAL PROCEEDINGS (Details)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 26, 2017
USD ($)
Feb. 28, 2016
USD ($)
Feb. 26, 2017
USD ($)
item
Feb. 28, 2016
USD ($)
May 29, 2016
USD ($)
COMMITMENTS, CONTINGENCIES, GUARANTEES AND LEGAL PROCEEDINGS          
Number of estimates of foregoing matters | item     1    
Lamb-Weston Meijer          
COMMITMENTS, CONTINGENCIES, GUARANTEES AND LEGAL PROCEEDINGS          
Total liabilities $ 220.0   $ 220.0   $ 203.7
Partners' equity 275.6   275.6   284.5
Potato supply agreements          
COMMITMENTS, CONTINGENCIES, GUARANTEES AND LEGAL PROCEEDINGS          
Payments made under the agreement 12.8 $ 15.9 136.0 $ 133.9  
Guaranteed amount 7.3   7.3    
Aggregate amount of advances $ 54.5   54.5   $ 15.7
Face value of income tax credits     $ 26.7