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Convertible Senior Notes (Details)
3 Months Ended 6 Months Ended
Aug. 01, 2020
USD ($)
$ / shares
Rate
Apr. 17, 2020
USD ($)
item
$ / shares
Rate
Aug. 01, 2020
USD ($)
$ / shares
Aug. 01, 2020
USD ($)
$ / shares
Feb. 01, 2020
USD ($)
Aug. 03, 2019
USD ($)
Convertible Senior Notes            
Par value $ 575,000,000.0 $ 575,000,000 $ 575,000,000.0 $ 575,000,000.0    
Convertible senior notes 404,573,000   404,573,000 404,573,000 $ 0 $ 0
Equity component $ 160,700,000   $ 160,700,000 $ 160,700,000    
Conversion Option, Convertible Senior Notes            
Convertible Senior Notes            
Par value   $ 575,000,000.0        
Interest rate, stated percentage   3.25%        
Over allotment option   $ 75,000,000.0        
Proceeds from debt, net of issuance costs   557,600,000        
Debt issuance costs   $ 17,400,000        
Threshold trading days | item   20        
Threshold consecutive trading days | item   30        
Conversion percentage of stock price trigger   130.00%        
Convertible principal amount   $ 1,000        
Consecutive business days, following measurement period | item   5        
Conversion percentage trigger based on measurement period   0.98        
Conversion ratio | Rate 2847.88% 2826.18%        
Conversion price | $ / shares $ 35.11 $ 35.38 $ 35.11 $ 35.11    
Convertible senior notes   $ 396,900,000        
Equity component   $ 160,700,000        
Interest rate, effective percentage   11.60%        
Amortization and interest expense, Convertible Senior Notes     $ 11,200,000 $ 13,100,000