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Debt (Details)
3 Months Ended 9 Months Ended
Jan. 20, 2021
USD ($)
Jan. 04, 2021
USD ($)
Oct. 31, 2021
USD ($)
Oct. 31, 2021
USD ($)
Jan. 31, 2021
USD ($)
Apr. 30, 2019
USD ($)
A&R Credit Agreement            
Line of Credit Facility [Line Items]            
Minimum interest coverage ratio     3.00 3.00    
Maximum senior secured leverage ratio     3.00 3.00    
Maximum total leverage ratio     5.50 5.50    
Maximum total leverage ratio, stepped down     3.50 3.50    
A&R Credit Agreement | Minimum            
Line of Credit Facility [Line Items]            
Commitment fee   0.15%        
A&R Credit Agreement | Maximum            
Line of Credit Facility [Line Items]            
Commitment fee   0.25%        
3.00% Senior Notes | Senior Notes            
Line of Credit Facility [Line Items]            
Aggregate principal amount $ 750,000,000          
Stated interest rate 3.00%          
Proceeds from issuance of Senior Notes, net of debt financing costs $ 738,000,000          
Payment for underwriting commissions 9,400,000          
Payments of financing costs $ 2,600,000          
Interest expense, amortization of debt issuance costs and accretion of debt discount     $ 6,000,000 $ 18,000,000    
Debt instrument, fair value     742,800,000 742,800,000    
3.00% Senior Notes | Senior Notes | Debt Instrument, Redemption, Period One            
Line of Credit Facility [Line Items]            
Percentage of original principal amount 40.00%          
3.00% Senior Notes | Senior Notes | Debt Instrument, Redemption, Period Two            
Line of Credit Facility [Line Items]            
Redemption percentage 101.50%          
3.00% Senior Notes | Senior Notes | Debt Instrument, Redemption, Period Three            
Line of Credit Facility [Line Items]            
Redemption percentage 100.75%          
3.00% Senior Notes | Senior Notes | Debt Instrument, Redemption, Period Four            
Line of Credit Facility [Line Items]            
Redemption percentage 100.00%          
3.00% Senior Notes | Senior Notes | Debt Instrument, Redemption, Period Five            
Line of Credit Facility [Line Items]            
Redemption percentage 101.00%          
3.00% Senior Notes | Senior Notes | Plus "Make Whole" Premium | Debt Instrument, Redemption, Period One            
Line of Credit Facility [Line Items]            
Redemption percentage 100.00%          
3.00% Senior Notes | Senior Notes | Proceeds From Equity Offering, Provided Principal Amount of Redemptions Does Not Exceed 40% | Debt Instrument, Redemption, Period One            
Line of Credit Facility [Line Items]            
Redemption percentage 103.00%          
Revolving line of credit            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity           $ 150,000,000
Unused standby letter of credit     $ 0 $ 0 $ 0  
Revolving line of credit | A&R Credit Agreement            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity   $ 750,000,000        
Incremental borrowing facility   250,000,000        
Letter of credit            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity           10,000,000
Letter of credit | A&R Credit Agreement            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity   100,000,000        
Swingline            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity           $ 10,000,000
Swingline | A&R Credit Agreement            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity   $ 50,000,000        
Eurodollar Loans | A&R Credit Agreement | LIBOR            
Line of Credit Facility [Line Items]            
Margin   0.00%        
Eurodollar Loans | A&R Credit Agreement | LIBOR | Minimum            
Line of Credit Facility [Line Items]            
Margin   1.50%        
Eurodollar Loans | A&R Credit Agreement | LIBOR | Maximum            
Line of Credit Facility [Line Items]            
Margin   2.00%        
ABR Loans | A&R Credit Agreement | Federal funds rate            
Line of Credit Facility [Line Items]            
Margin   0.50%        
ABR Loans | A&R Credit Agreement | Eurodollar rate            
Line of Credit Facility [Line Items]            
Margin   1.00%        
ABR Loans | A&R Credit Agreement | Eurodollar rate | Minimum            
Line of Credit Facility [Line Items]            
Margin   (0.25%)        
ABR Loans | A&R Credit Agreement | Eurodollar rate | Maximum            
Line of Credit Facility [Line Items]            
Margin   0.25%