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Debt and Financing Arrangements (Details Textual)
12 Months Ended 25 Months Ended
Apr. 30, 2017
USD ($)
Bank
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Apr. 30, 2017
USD ($)
Bank
Mar. 31, 2015
USD ($)
Debt Instrument [Line Items]          
Debt instrument face amount $ 4,950,000,000 $ 5,150,000,000   $ 4,950,000,000  
Repayment of long-term debt 200,000,000 800,000,000 $ 4,193,900,000    
Other debt costs $ 0 0 173,300,000    
Percentage of the principal amount thereof which company can prepay 100.00%     100.00%  
Revolving credit facility maximum borrowing capacity $ 1,500,000,000.0     $ 1,500,000,000.0  
Number of banks | Bank 11     11  
Long-term Line of Credit $ 0 0   $ 0  
Commercial paper, borrowing capacity 1,000,000,000.0     1,000,000,000.0  
Commercial paper, amount outstanding 454,000,000 284,000,000   454,000,000  
Interest paid 162,200,000 167,300,000 92,300,000    
Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument face amount         $ 3,700,000,000
Term Loan Credit Agreement due March 23, 2020 [Member]          
Debt Instrument [Line Items]          
Debt instrument face amount $ 550,000,000.0 $ 750,000,000   $ 550,000,000.0 $ 1,800,000,000
Weighted average interest rate on long-term debt 2.24%     2.24%  
Percent of principal to be paid quarterly 2.50%        
Repayment of long-term debt $ 200,000,000     $ 1,200,000,000  
Senior Notes Due Period Ten [Member]          
Outstanding derivative contracts          
Interest rate on notes 3.50% 3.50%   3.50%  
Debt Instrument [Line Items]          
Debt instrument face amount $ 750,000,000.0 $ 750,000,000   $ 750,000,000.0  
Long-term Debt [Member]          
Debt Instrument [Line Items]          
Increase to long-term debt related to the termination of interest rate swap $ 36,300,000        
Commercial Paper [Member]          
Debt Instrument [Line Items]          
Commercial paper weighted-average interest rate 1.15% 0.65%   1.15%  
Fair Value Hedging [Member]          
Outstanding derivative contracts          
Gain (Loss) on Contract Termination     $ (58,100,000)