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Convertible Senior Notes (Details)
3 Months Ended
Apr. 17, 2020
USD ($)
item
$ / shares
Rate
May 02, 2020
USD ($)
Feb. 01, 2020
USD ($)
May 04, 2019
USD ($)
Convertible Senior Notes        
Par value $ 575,000,000.0 $ 575,000,000.0   $ 0
Convertible senior notes   398,121,000 $ 0 0
Equity component   160,700,000   $ 0
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 557,700,000      
Debt issuance costs $ 17,300,000      
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 2826.18%      
Conversion price | $ / shares $ 35.38      
Convertible senior notes $ 397,000,000.0      
Equity component $ 160,700,000      
Interest rate, effective percentage 11.60%      
Amortization and interest expense, Convertible Senior Notes   $ 1,900,000