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Borrowing Arrangements (Additional Information) (Details)
1 Months Ended 9 Months Ended
Jul. 27, 2017
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Oct. 31, 2019
USD ($)
Oct. 31, 2018
Jan. 31, 2019
USD ($)
Dec. 15, 2017
USD ($)
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity   $ 650,000,000.0              
Weighted average interest rate           3.125%      
Current portion of long-term notes payable, net           $ 449,400,000   $ 0  
Term Loan                  
Debt Instrument [Line Items]                  
Debt instrument, face amount   500,000,000.0       150,000,000.0      
Senior Notes | 3.5% Notes due June 15, 2027                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 500,000,000.0            
Debt instrument, stated interest rate     3.50%            
Debt instrument, unamortized discount     $ 3,100,000            
Debt issuance costs, gross     4,900,000            
Proceeds from debt, net of issuance costs     $ 492,000,000.0            
Debt issuance redemption discount premium, percentage of principle amount     101.00%            
Debt fair value           $ 519,000,000.0      
Senior Notes | Senior Notes 2017                  
Debt Instrument [Line Items]                  
Debt instrument, face amount                 $ 400,000,000.0
Debt instrument, stated interest rate         1.95%        
Redemption price $ 400,900,000                
Repayments of debt $ 401,800,000                
Senior Notes | Senior Notes due 2020                  
Debt Instrument [Line Items]                  
Debt instrument, face amount       $ 450,000,000.0          
Debt instrument, stated interest rate       3.125%   3.125%      
Current portion of long-term notes payable, net           $ 450,000,000.0      
Senior Notes | Senior Notes due 2025                  
Debt Instrument [Line Items]                  
Debt instrument, face amount       $ 300,000,000.0          
Debt instrument, stated interest rate       4.375%          
Senior Notes | 2015 Senior Notes                  
Debt Instrument [Line Items]                  
Debt instrument, unamortized discount       $ 1,700,000          
Debt issuance costs, gross       6,300,000          
Proceeds from debt, net of issuance costs       $ 742,000,000.0          
Debt issuance redemption discount premium, percentage of principle amount       101.00%          
Debt fair value           781,600,000      
Senior Notes | Senior Notes 2022                  
Debt Instrument [Line Items]                  
Debt instrument, face amount         $ 350,000,000.0        
Debt instrument, stated interest rate         3.60%        
Senior Notes | 2012 Senior Notes                  
Debt Instrument [Line Items]                  
Debt instrument, unamortized discount         $ 4,500,000        
Debt issuance costs, gross         6,100,000        
Proceeds from debt, net of issuance costs         $ 739,300,000        
Debt fair value           362,000,000.0      
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity   400,000,000.0              
Revolving Credit Facility | December 17, 2018 Credit Agreement                  
Debt Instrument [Line Items]                  
Line of credit facility, additional borrowings available   $ 350,000,000.0              
Line of credit facility, outstanding borrowings           $ 0      
Revolving Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Interest rate           2.911%      
London Interbank Offered Rate (LIBOR) | Term Loan                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate   1.125%              
Minimum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate             0.00%    
Minimum | Base Rate | Revolving Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate   0.00%              
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | December 17, 2018 Credit Agreement                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate             0.90%    
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate   0.875%              
Maximum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate             0.50%    
Maximum | Base Rate | Revolving Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate   0.625%              
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | December 17, 2018 Credit Agreement                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate             1.50%    
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Basis spread on variable interest rate   1.625%              
Debt Instrument, Covenant Period, Fiscal Quarter Ending January 31, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement                  
Debt Instrument [Line Items]                  
Debt covenant, minimum interest coverage   2.50              
Debt Instrument, Covenant Period, Fiscal Quarter Ending April 30, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement                  
Debt Instrument [Line Items]                  
Debt covenant, minimum interest coverage   3.00              
Debt Instrument, Covenant Period, Fiscal Quarter Ending July 31, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement                  
Debt Instrument [Line Items]                  
Debt covenant, maximum leverage ratio   3.50              
Debt Instrument, Covenant Period, Fiscal Quarter Ending January 31, 2020 | Revolving Credit Facility | December 17, 2018 Credit Agreement                  
Debt Instrument [Line Items]                  
Debt covenant, maximum leverage ratio   3.00