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Debt and Financing Arrangements (Details Textual)
3 Months Ended 6 Months Ended 18 Months Ended
Oct. 31, 2019
USD ($)
Bank
Oct. 31, 2018
USD ($)
Oct. 31, 2019
USD ($)
Bank
Oct. 31, 2018
USD ($)
Oct. 31, 2019
USD ($)
Bank
Apr. 30, 2019
USD ($)
Nov. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
May 14, 2018
USD ($)
Debt and Financing Arrangements (Textual) [Abstract]                  
Debt instrument face amount $ 5,400,000,000.0   $ 5,400,000,000.0   $ 5,400,000,000.0 $ 5,500,000,000.0      
Repayments of long-term debt     100,000,000.0 $ 300,000,000.0          
Interest paid 78,400,000 $ 84,100,000 100,000,000.0 $ 107,400,000          
Short-term borrowings $ 327,900,000   $ 327,900,000   $ 327,900,000 426,000,000.0      
Senior Notes [Member]                  
Debt and Financing Arrangements (Textual) [Abstract]                  
Percentage of the principal amount thereof which company can prepay 100.00%   100.00%   100.00%        
Term Loan Credit Agreement due May 14, 2021                  
Debt and Financing Arrangements (Textual) [Abstract]                  
Debt instrument face amount $ 700,000,000.0   $ 700,000,000.0   $ 700,000,000.0 800,000,000.0     $ 1,500,000,000
Repayments of long-term debt $ 100,000,000.0       $ 800,000,000.0        
Long-term Debt, Weighted Average Interest Rate, at Point in Time 2.94%   2.94%   2.94%        
Revolving Credit Facility [Member]                  
Debt and Financing Arrangements (Textual) [Abstract]                  
Number of banks | Bank 11   11   11        
Outstanding balance under revolving credit facility $ 0   $ 0   $ 0 $ 0      
Revolving credit facility maximum borrowing capacity $ 1,800,000,000   $ 1,800,000,000   $ 1,800,000,000        
Commercial Paper [Member]                  
Debt and Financing Arrangements (Textual) [Abstract]                  
Commercial paper weighted-average interest rate 2.07%   2.07%   2.07% 2.75%      
Commercial paper, borrowing capacity $ 1,800,000,000   $ 1,800,000,000   $ 1,800,000,000        
Short-term borrowings 327,900,000   327,900,000   327,900,000 $ 426,000,000.0      
Interest rate contracts                  
Derivative Instruments, Gain (Loss) [Line Items]                  
Gross notional amount $ 800,000,000.0   800,000,000.0   $ 800,000,000.0 $ 800,000,000.0 $ 300,000,000.0 $ 500,000,000.0  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax     $ (146,200,000)