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Goodwill and Other Intangible Assets (Details Textual)
$ in Millions
12 Months Ended
Apr. 30, 2015
USD ($)
ReportingUnits
Apr. 30, 2014
USD ($)
Apr. 30, 2013
USD ($)
Goodwill and Other intangible assets (Textual) [Abstract]      
Weighted-average useful life of the finite-lived intangible assets 22 years    
Goodwill And Other Intangible Assets (Additional Textual) [Abstract]      
Amortization expense for finite-lived intangible assets $ 110.3 $ 98.7 $ 96.6
Estimated amortization expense for 2016 212.2    
Estimated amortization expense for 2017 211.5    
Estimated amortization expense for 2018 209.1    
Estimated amortization expense for 2019 208.9    
Estimated amortization expense for 2020 $ 207.4    
Number of reporting units | ReportingUnits 6    
Customer and Contractual Relationships [Member]      
Goodwill and Other intangible assets (Textual) [Abstract]      
Weighted-average useful life of the finite-lived intangible assets 23 years    
Trademarks [Member]      
Goodwill and Other intangible assets (Textual) [Abstract]      
Weighted-average useful life of the finite-lived intangible assets 15 years    
Patents And Technology [Member]      
Goodwill and Other intangible assets (Textual) [Abstract]      
Weighted-average useful life of the finite-lived intangible assets 13 years