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Convertible Senior Notes and Related Transactions - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 12 Months Ended
May 01, 2019
$ / shares
Apr. 30, 2019
USD ($)
$ / shares
shares
Jan. 30, 2021
USD ($)
$ / shares
shares
Feb. 01, 2020
USD ($)
Feb. 02, 2019
USD ($)
Debt Instrument [Line Items]          
Amortization of debt discount     $ 10,394,000 $ 7,558,000 $ 0
Amortization of debt issuance costs     $ 1,351,000 919,000 0
Option to purchase, number of shares (in shares) | shares   11.6      
Conversion price (in dollars per share) | $ / shares $ 46.88 $ 25.78 $ 25.78    
Convertible note hedge cost   $ 61,000,000.0      
Warrants outstanding (in shares) | shares   11.6 11.6    
Strike price of warrants (in dollars per share) | $ / shares   $ 46.88 $ 46.88    
Proceeds from issuance of warrants   $ 28,100,000 $ 0 28,080,000 $ 0
Convertible senior notes debt discount     (8,776,000) (11,167,000)  
Convertible senior notes hedge transactions     9,697,000 12,284,000  
Senior notes | 2.00% Convertible Senior Notes Due 2024          
Debt Instrument [Line Items]          
Interest rate (as a percent)   2.00%      
Convertible debt issued   $ 300,000,000      
Conversion ratio   0.0387879      
Conversion price (in dollars per share) | $ / shares   $ 25.78      
Percentage of principal and interest of the Notes that the Company may be required to purchase in the event of a fundamental change   100.00%      
Minimum percentage of holders of the Notes which may be able to declare the Notes to be due and payable upon the occurrence of certain events of default   25.00%      
Percentage of principal and interest that may be declared due and payable upon the occurrence of certain events of default   100.00%      
Effective interest rate   6.80%      
Amortization of debt discount     10,400,000 7,600,000  
Amortization of debt issuance costs     900,000 700,000  
Initial purchasers | Senior notes | 2.00% Convertible Senior Notes Due 2024          
Debt Instrument [Line Items]          
Debt issuance costs   $ 3,800,000      
Third party offerers | Senior notes | 2.00% Convertible Senior Notes Due 2024          
Debt Instrument [Line Items]          
Debt issuance costs   $ 1,500,000      
Level 2 | Senior notes | 2.00% Convertible Senior Notes Due 2024          
Debt Instrument [Line Items]          
Fair value of convertible senior notes     $ 303,500,000 $ 272,000,000.0