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Restructuring (Details Textual)
$ in Millions
12 Months Ended
Apr. 30, 2015
USD ($)
Position
Apr. 30, 2014
USD ($)
Apr. 30, 2013
USD ($)
Restructuring (Textual) [Abstract]      
Restructuring costs incurred announcement-to-date $ 263.8    
Reduction in positions due to restructuring | Position 850    
Total restructuring charges $ 15.4 $ 20.8 $ 38.8
Cost of products sold - restructuring and merger and integration $ 1.1 $ 5.1 $ 10.0