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Acquisitions (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Mar. 23, 2015
Business Acquisition [Line Items]        
Cash consideration, net of cash acquired $ 1,320.5 $ 101.8 $ 0.0  
Big Heart [Member]        
Business Acquisition [Line Items]        
Shares issued       $ 2,035.5
Assumed debt from Big Heart       $ 2,630.2
Cash consideration, net of cash acquired 1,240.0      
Total purchase price $ 5,905.7