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Debt and Financing Arrangements (Details Textual) - Types of Financial Instruments [Domain]
$ in Millions
12 Months Ended
Apr. 30, 2015
USD ($)
Bank
Apr. 30, 2014
USD ($)
Apr. 30, 2013
USD ($)
Mar. 20, 2015
USD ($)
Mar. 02, 2015
USD ($)
Feb. 02, 2015
USD ($)
Debt and Financing Arrangements (Textual) [Abstract]            
Repayment of long-term debt $ 4,193.9 $ 50.0 $ 50.0      
Capitalized debt issuance costs 46.4 6.7        
Other debt costs 173.3 0.0 0.0      
Debt instrument face amount       $ 3,700.0    
Debt assumed and repaid in acquisition $ 1,700.0          
Debt and Financing Arrangements (Additional Textual) [Abstract]            
Number of banks | Bank 11          
Revolving credit facility maximum borrowing capacity $ 1,500.0          
Percentage of the principal amount thereof which company can prepay 100.00%          
Interest paid $ 92.3 83.3 $ 97.7      
Commercial paper, borrowing capacity 1,000.0          
Commercial paper, amount outstanding 226.0          
Senior Notes [Member]            
Debt and Financing Arrangements (Textual) [Abstract]            
Repayment of long-term debt 1,100.0          
Debt instrument face amount       $ 3,700.0    
Make-whole payments on long-term debt 163.3          
4.78% Senior Notes due June 1, 2014 [Member]            
Debt and Financing Arrangements (Textual) [Abstract]            
Repayment of long-term debt $ 100.0          
Interest rate on notes 4.78%          
Debt instrument face amount $ 0.0 100.0        
3.50% Senior Notes due October 15, 2021 [Member]            
Debt and Financing Arrangements (Textual) [Abstract]            
Interest rate on notes 3.50%          
Debt instrument face amount $ 750.0 750.0        
Term Loan Credit Agreement due March 23, 2020 [Member]            
Debt and Financing Arrangements (Textual) [Abstract]            
Repayment of long-term debt 200.0          
Capitalized debt issuance costs 5.2          
Debt instrument face amount $ 1,550.0 0.0     $ 1,800.0  
Weighted average interest rate on long-term debt 1.53%          
Percent of principal to be paid quarterly 2.50%          
Long-term Debt [Member]            
Debt and Financing Arrangements (Textual) [Abstract]            
Increase to long-term debt related to termination of interest rate swap $ 51.3          
Commercial Paper [Member]            
Debt and Financing Arrangements (Textual) [Abstract]            
Commercial paper weighted-average interest rate 0.45%          
Cash Flow Hedging [Member]            
Outstanding derivative contracts            
Gain (loss) on early termination agreement $ (4.0)          
Fair Value Hedging [Member]            
Outstanding derivative contracts            
Gain (loss) on early termination agreement 58.1          
Interest rate contract [Member]            
Outstanding derivative contracts            
Gross contract notional amount 0.0 $ 750.0       $ 1,100.0
Interest receivable 4.6          
Deferred gain on discontinuation of interest rate fair value hedge 53.5          
Fair value adjustment of the interest rate swap $ 14.9          
Big Heart [Member] | Senior Notes [Member]            
Debt and Financing Arrangements (Textual) [Abstract]            
Interest rate on notes 7.625%          
Debt assumed and repaid in acquisition $ 900.0          
Big Heart [Member] | Bridge Loan [Member]            
Debt and Financing Arrangements (Textual) [Abstract]            
Bridge loan         $ 3,800.0  
Bridge loan term 364 days          
Other debt costs $ 21.5