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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Nov. 09, 2016
Feb. 26, 2017
Feb. 26, 2017
Feb. 28, 2016
May 29, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cash payment received from Lamb Weston     $ 489.0 $ 0.0  
Income tax benefit recognized   $ 3.5 17.5    
Cumulative effect on retained earnings, net of tax         $ (3.9)
Increase in cash flows from operating activities     846.5 738.6  
Decrease in cash flows from financing activities     $ 1,107.0 2,673.0  
Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect on retained earnings, net of tax         (3.9)
New Accounting Pronouncement, Early Adoption, Effect | ASU 2016-09          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Increase in cash flows from operating activities       43.5  
Decrease in cash flows from financing activities       $ 43.5  
New Accounting Pronouncement, Early Adoption, Effect | ASU 2016-09 | Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect on retained earnings, net of tax         $ 3.9
Discontinued operations, spinoff | Lamb Weston          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Distribution of the Company's interest in Lamb Weston (as a percent) 100.00%        
Cash payment received from Lamb Weston $ 823.5