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Acquisitions (Details 2) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2015
Mar. 23, 2015
Apr. 30, 2014
The purchase price allocated to the identifiable intangible assets      
Total intangible assets     $ 37.6
Finite-Lived Intangible Asset, Useful Life 22 years    
Trademarks [Member]      
The purchase price allocated to the identifiable intangible assets      
Finite-Lived Intangible Asset, Useful Life 15 years    
Big Heart [Member]      
The purchase price allocated to the identifiable intangible assets      
Total intangible assets   $ 4,009.8  
Big Heart [Member] | Customer relationships [Member]      
The purchase price allocated to the identifiable intangible assets      
Intangible assets with finite lives   2,289.8  
Finite-Lived Intangible Asset, Useful Life 25 years    
Big Heart [Member] | Trademarks [Member]      
The purchase price allocated to the identifiable intangible assets      
Intangible assets with finite lives   257.0  
Intangible assets with indefinite lives   $ 1,463.0  
Finite-Lived Intangible Asset, Useful Life 15 years