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Divestitures (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 26, 2017
Nov. 27, 2016
Feb. 28, 2016
Nov. 29, 2015
Feb. 26, 2017
Feb. 28, 2016
May 29, 2016
Divestitures [Line Items]              
Proceeds from divestitures         $ 17.5 $ 825.8  
Pre-tax gain (loss) on sale of business $ 0.0   $ 1.5   (13.5) $ 200.6  
Brand asset retained $ 4,143.7       $ 4,143.7   $ 4,147.5
Green Giant Brand [Member] | Regions Excluding North America [Member]              
Divestitures [Line Items]              
Brand asset retained       $ 30.1      
Sale of Martel, Ohio Manufacturing Facility [Member] | Convenience Stores and Foodservice Segment [Member]              
Divestitures [Line Items]              
Proceeds from divestitures   $ 17.5          
Pre-tax gain (loss) on sale of business   $ (13.5)          
Sale of North American Green Giant Product Lines [Member]              
Divestitures [Line Items]              
Proceeds from divestitures       822.7      
Pre-tax gain (loss) on sale of business       199.1      
Net cash proceeds after transaction related costs       $ 788.0