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Debt and Financing Arrangements (Details Textual)
3 Months Ended 9 Months Ended
Jan. 31, 2022
USD ($)
Bank
Oct. 31, 2021
USD ($)
Jul. 31, 2021
USD ($)
Jan. 31, 2021
USD ($)
Jan. 31, 2022
USD ($)
Bank
Jan. 31, 2021
USD ($)
Aug. 19, 2021
USD ($)
Apr. 30, 2021
USD ($)
Debt and Financing Arrangements (Textual) [Abstract]                
Debt instrument face amount $ 4,350,000,000       $ 4,350,000,000     $ 4,700,000,000
Repayments of long-term debt         1,157,000,000 $ 700,000,000.0    
Short-term borrowings 94,000,000.0       94,000,000.0     82,000,000.0
Interest paid 8,600,000     $ 8,700,000 90,400,000 $ 95,100,000    
Commercial Paper [Member]                
Debt and Financing Arrangements (Textual) [Abstract]                
Commercial paper, borrowing capacity 2,000,000,000       2,000,000,000   $ 1,800,000,000  
Short-term borrowings $ 94,000,000.0       $ 94,000,000.0     $ 82,000,000.0
Commercial paper weighted-average interest rate 0.17%       0.17%     0.17%
Senior Notes [Member]                
Debt and Financing Arrangements (Textual) [Abstract]                
Debt instrument face amount   $ 800,000,000.0            
Debt issuance costs   7,200,000            
Debt Instrument, Unamortized Discount   2,400,000            
3.50% Senior Notes due October 15, 2021                
Debt and Financing Arrangements (Textual) [Abstract]                
Debt instrument face amount $ 0       $ 0     $ 750,000,000.0
Repayments of long-term debt   $ 750,000,000.0            
3.00% Senior Notes due March 15, 2022                
Debt and Financing Arrangements (Textual) [Abstract]                
Debt instrument face amount $ 0       $ 0     400,000,000.0
Repayments of long-term debt     $ 400,000,000.0          
3.00% Senior Notes due March 15, 2022 | Other Nonoperating Income (Expense)                
Debt and Financing Arrangements (Textual) [Abstract]                
Gain (Loss) on Extinguishment of Debt     $ (6,900,000)          
Revolving Credit Facility [Member]                
Debt and Financing Arrangements (Textual) [Abstract]                
Debt issuance costs             4,300,000  
Number of banks | Bank 11       11      
Revolving credit facility maximum borrowing capacity $ 2,000,000,000       $ 2,000,000,000   $ 1,800,000,000  
Outstanding balance under revolving credit facility $ 0       $ 0     $ 0