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EARNINGS PER SHARE - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Nov. 25, 2018
May 26, 2019
May 27, 2018
May 28, 2017
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Issuance of Conagra Brands, Inc. common shares, net   $ 555.7 $ 0.0 $ 0.0
Stock options        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Stock options outstanding excluded from computation (in shares)   2.0 1.3 0.8
Pinnacle Foods Inc. (Pinnacle)        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Company shares issues out of treasury (shares) 77.5      
Issuance of common stock (in shares) 16.3      
Common stock, par value (in dollars per share) $ 5.00      
Issuance of Conagra Brands, Inc. common shares, net $ 555.7      
Underwritten Public Offering        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Issuance of common stock (in shares) 16.3      
Common stock, par value (in dollars per share) $ 5.00      
Issuance of Conagra Brands, Inc. common shares, net $ 555.7