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Acquisition (Acquisition Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Aug. 26, 2018
May 27, 2018
Aug. 27, 2017
Business Acquisition [Line Items]      
Net interest expense $ 133.5   $ 72.4
Business Acquisition, Blue Buffalo [Member]      
Business Acquisition [Line Items]      
Aggregate purchase price   $ 8,000.0  
Consideration for net debt repaid   $ 103.0  
Cash received per share   $ 40  
Debt assumption   $ 6,000.0  
Equity issuance   1,000.0  
Goodwill, Acquired During Period   5,300.0  
Business Acquisition, Blue Buffalo [Member] | SG&A Expense [Member]      
Business Acquisition [Line Items]      
Acquisition integration costs $ 8.7    
Business Acquisition, Blue Buffalo [Member] | Customer Relationships [Member]      
Business Acquisition [Line Items]      
Finite Lived Intangible Assets Acquired   269.0  
Business Acquisition, Blue Buffalo [Member] | Blue Buffalo Brand [Member]      
Business Acquisition [Line Items]      
Indefinite Lived Intangible Assets Acquired   $ 2,700.0