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Borrowing Arrangements - Additional Information (Details)
1 Months Ended 6 Months Ended
Jan. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Jul. 31, 2021
USD ($)
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 650,000,000        
Senior Notes            
Debt Instrument [Line Items]            
Debt redemption percentage of principle amount (in percentage)           101.00%
2020 Notes | Senior Notes            
Debt Instrument [Line Items]            
Aggregate principal amount $ 500,000,000         $ 500,000,000.0
Stated interest rate (in percentage) 2.85%          
Unamortized discount $ 1,100,000          
Debt issuance costs 4,800,000          
Proceeds from debt, net of issuance costs 494,100,000          
2015 Notes | Senior Notes            
Debt Instrument [Line Items]            
Repayments of debt $ 450,000,000          
December 17, 2018 Credit Agreement | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, increase limit   $ 350,000,000        
Line of credit facility, outstanding borrowings           $ 0
December 17, 2018 Credit Agreement | Revolving Credit Facility | Minimum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate (in percentage)           0.00%
December 17, 2018 Credit Agreement | Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (in percentage)           0.90%
December 17, 2018 Credit Agreement | Revolving Credit Facility | Maximum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate (in percentage)           0.50%
December 17, 2018 Credit Agreement | Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (in percentage)           1.50%
December 17, 2018 Credit Agreement | Revolving Credit Facility | Fiscal Quarter Ending April 30, 2019            
Debt Instrument [Line Items]            
Debt covenant, interest coverage ratio, minimum   3.00        
December 17, 2018 Credit Agreement | Revolving Credit Facility | Fiscal Quarter Ending January 31, 2020            
Debt Instrument [Line Items]            
Debt covenant, leverage ratio, maximum   3.00        
2017 Notes due in 2027 | Senior Notes            
Debt Instrument [Line Items]            
Aggregate principal amount     $ 500,000,000      
Stated interest rate (in percentage)     3.50%      
Unamortized discount     $ 3,100,000      
Debt issuance costs     4,900,000      
Proceeds from debt, net of issuance costs     492,000,000      
2017 Notes | Senior Notes            
Debt Instrument [Line Items]            
Aggregate principal amount           $ 500,000,000.0
Repayments of debt     $ 400,000,000      
2015 Notes | Senior Notes            
Debt Instrument [Line Items]            
Aggregate principal amount       $ 300,000,000   300,000,000.0
Stated interest rate (in percentage)       4.375%    
Unamortized discount       $ 1,100,000    
Debt issuance costs       2,500,000    
Proceeds from debt, net of issuance costs       $ 296,400,000    
2012 Notes | Senior Notes            
Debt Instrument [Line Items]            
Aggregate principal amount         $ 350,000,000 $ 350,000,000.0
Stated interest rate (in percentage)         3.60%  
Unamortized discount         $ 500,000  
Debt issuance costs         2,800,000  
Proceeds from debt, net of issuance costs         $ 346,700,000