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Convertible Senior Notes - $300 million 0.00% Convertible Senior Notes due 2020 (Detail)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 29, 2020
shares
Jul. 31, 2020
USD ($)
shares
May 31, 2020
USD ($)
shares
Jul. 31, 2015
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
D
$ / shares
Aug. 01, 2020
USD ($)
Jan. 30, 2021
USD ($)
$ / shares
shares
Feb. 01, 2020
USD ($)
shares
Feb. 02, 2019
USD ($)
shares
Debt Instrument                  
Amortization of debt discount             $ 42,372,000 $ 46,245,000 $ 41,868,000
(Gain) Loss on extinguishment of debt             $ 152,000 $ (6,472,000) $ (917,000)
Common stock issued from settlement of Notes | shares             20,995,387 19,236,681  
Common Stock                  
Debt Instrument                  
Shares acquired from notes settlement | shares             600 2,167,396 2,050,379
Convertible senior notes due 2020                  
Debt Instrument                  
Debt instrument, issuance date         Jun. 30, 2015        
Debt instrument, principal amount         $ 300,000,000     $ 300,000,000  
Debt instrument, maturity date         Jul. 15, 2020        
Debt instrument, conversion description         The initial conversion rate applicable to the 2020 Notes was 8.4656 shares of common stock per $1,000 principal amount of 2020 Notes, which was equivalent to an initial conversion price of approximately $118.13 per share.        
Events of default and acceleration of maturity description         Certain events were also considered “events of default” under the 2020 Notes, which could have resulted in the acceleration of the maturity of the 2020 Notes, as described in the indenture governing the 2020 Notes.        
Debt instrument, convertible earliest date         Mar. 15, 2020        
Debt instrument, effective interest rate         6.47%        
Discounts upon original issuance         $ 3,800,000        
Third party offering costs         $ 2,300,000        
Amortization of debt issuance costs             $ 600,000 1,200,000 $ 1,100,000
Amortization of debt discount             8,900,000 $ 18,200,000 $ 17,100,000
Aggregate amounts outstanding   $ 290,600,000 $ 9,400,000       $ 0    
Debt amount settled in cash   $ 290,600,000 $ 9,200,000            
Shares issued upon conversion | shares   1,116,718 14,927            
(Gain) Loss on extinguishment of debt   $ 0       $ 200,000      
Shares acquired from notes settlement | shares 17                
Convertible senior notes due 2020 | Common Stock                  
Debt Instrument                  
Debt instrument, initial conversion rate         8.4656        
Debt instrument, conversion principal amount         $ 1,000        
Conversion price per share | $ / shares         $ 118.13   $ 118.13    
Convertible senior notes due 2020 | Convertible debt instrument conversion period one                  
Debt Instrument                  
Debt instrument, convertible trading days | D         20        
Debt instrument, convertible consecutive trading days | D         30        
Debt instrument, convertible percentage of stock price         130.00%        
Convertible senior notes due 2020 | Convertible debt instrument conversion period two                  
Debt Instrument                  
Debt instrument, conversion principal amount         $ 1,000        
Debt instrument, convertible trading days | D         5        
Debt instrument, convertible consecutive trading days | D         10        
Debt instrument, convertible percentage of stock price         98.00%        
Private Offering | Convertible senior notes due 2020                  
Debt Instrument                  
Debt instrument, principal amount         $ 250,000,000        
Debt instrument, interest rate         0.00%        
Overallotment Option | Convertible senior notes due 2020                  
Debt Instrument                  
Debt instrument, issuance date       Jul. 31, 2015          
Debt instrument, principal amount       $ 50,000,000          
Convertible bond hedge and warrant transactions                  
Debt Instrument                  
Shares issued upon conversion | shares               167,100  
Convertible bond hedge and warrant transactions | Convertible senior notes due 2020                  
Debt Instrument                  
Debt instrument, issuance date         Jun. 30, 2015        
Shares issued upon conversion | shares             1,386,580    
Shares received upon exercise of warrants | shares   1,116,735 14,927            
Convertible bond hedge and warrant transactions | Convertible senior notes due 2020 | Common Stock                  
Debt Instrument                  
Conversion price per share | $ / shares       $ 118.13          
Shares issued upon conversion | shares             2,540,000