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Debt - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 16, 2020
Apr. 01, 2020
Apr. 30, 2021
Apr. 30, 2021
Oct. 31, 2020
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Short-term debt     $ 412,600,000 $ 412,600,000 $ 409,300,000
Term loan          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Short-term debt     350,000,000.0 350,000,000.0 $ 350,000,000.0
Term Loan Agreement 2020 | Term loan          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Debt term 364 days        
Debt instrument, face amount $ 350,000,000.0   350,000,000.0 350,000,000.0  
Short-term debt     $ 350,000,000.0 $ 350,000,000.0  
Interest rate     0.92% 0.92%  
Term Loan Agreement 2020 | Term loan | Base Rate          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Debt instrument, basis spread on variable rate 0.00%        
Term Loan Agreement 2020 | Term loan | London Interbank Offered Rate (LIBOR)          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Debt instrument, basis spread on variable rate 0.80%        
Credit Agreement 2020 | Line of Credit | Revolving Credit Facility And Term Loan Facility 2020          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Potential additional borrowing capacity   $ 1,605,000,000      
Required minimum interest coverage ratio   3.00      
Required maximum total leverage ratio   3.75      
Interest coverage ratio     36.81 36.81  
Total leverage ratio     1.78 1.78  
Interest coverage ratio and total leverage ratio, expected minimum compliance period       12 months  
Credit Agreement 2020 | Line of Credit | Revolving Credit Facility And Term Loan Facility 2020 | Base Rate | Minimum          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Debt instrument, basis spread on variable rate   0.00%      
Credit Agreement 2020 | Line of Credit | Revolving Credit Facility And Term Loan Facility 2020 | Base Rate | Maximum          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Debt instrument, basis spread on variable rate   0.50%      
Credit Agreement 2020 | Line of Credit | Revolving Credit Facility And Term Loan Facility 2020 | London Interbank Offered Rate (LIBOR) | Minimum          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Debt instrument, basis spread on variable rate   0.75%      
Credit Agreement 2020 | Line of Credit | Revolving Credit Facility And Term Loan Facility 2020 | London Interbank Offered Rate (LIBOR) | Maximum          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Debt instrument, basis spread on variable rate   1.50%      
Credit Agreement 2020 | Line of Credit | Revolving Credit Facility          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Aggregate principal amount   $ 1,290,000,000 $ 1,290,000,000.0 $ 1,290,000,000.0  
Proceeds from line of credit   $ 445,000,000.0      
Debt outstanding     475,000,000.0 475,000,000.0  
Available borrowing capacity     813,600,000 813,600,000  
Outstanding letters of credit     1,400,000 1,400,000  
Credit Agreement 2020 | Line of Credit | Revolving Credit Facility | Minimum          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Commitment fee percentage   0.10%      
Credit Agreement 2020 | Line of Credit | Revolving Credit Facility | Maximum          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Commitment fee percentage   0.20%      
Credit Agreement 2020 | Line of Credit | 2020 Term Loan Facility          
Schedule of Long Term And Short Term Debt Instruments [Line Items]          
Aggregate principal amount   $ 850,000,000.0 850,000,000.0 850,000,000.0  
Proceeds from line of credit   $ 850,000,000.0      
Debt outstanding     $ 850,000,000.0 $ 850,000,000.0  
Interest rate     1.12% 1.12%  
Expensed debt issuance costs (less than)     $ 100,000 $ 100,000