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Convertible Senior Notes - Convertible Senior Notes due 2020 (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 29, 2020
Jul. 31, 2020
May 31, 2020
Jul. 31, 2015
Jun. 30, 2015
Aug. 01, 2020
Jan. 28, 2023
Jan. 29, 2022
Jan. 30, 2021
Jun. 30, 2018
Debt Instrument                    
Debt instrument, conversion principal amount                   $ 1,000
Amortization of debt discount             $ 0 $ 28,816,000 $ 42,372,000  
Debt amount settled in cash             13,064,000 335,729,000 215,846,000  
(Gain) Loss on extinguishment of debt             $ (169,578,000) $ (29,138,000) $ 152,000  
Shares acquired from notes settlement             3,719,550 0 0  
Common stock issued from settlement of Notes             22,045,385 21,506,967    
Convertible Senior Notes Due 2020 [Member]                    
Debt Instrument                    
Debt instrument, issuance date         Jun. 30, 2015          
Debt instrument, principal amount         $ 300,000,000          
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.          
Amortization of debt issuance costs                 $ 600,000  
Amortization of debt discount                 $ 8,900,000  
Debt outstanding   $ 291,000,000 $ 9,400,000              
Debt amount settled in cash   $ 291,000,000 $ 9,200,000              
Shares issued upon conversion   1,116,718 14,927              
(Gain) Loss on extinguishment of debt   $ 0       $ 200,000        
Shares acquired from notes settlement 17                  
Convertible Senior Notes Due 2020 [Member] | Common Stock                    
Debt Instrument                    
Conversion price per share             $ 118.13      
Private Offering                    
Debt Instrument                    
Debt instrument, principal amount                   $ 300,000,000
Discounts upon original issuance             $ 180,000 $ 37,576,000    
Debt outstanding             $ 43,420,000 $ 256,452,000    
Private Offering | Convertible Senior Notes Due 2020 [Member]                    
Debt Instrument                    
Debt instrument, principal amount         $ 250,000,000          
Debt instrument, interest rate         0.00%          
Overallotment option | Convertible Senior Notes Due 2020 [Member]                    
Debt Instrument                    
Debt instrument, issuance date       Jul. 31, 2015            
Debt instrument, principal amount       $ 50,000,000            
Convertible note bond hedges | Convertible Senior Notes Due 2020 [Member]                    
Debt Instrument                    
Shares issued upon conversion                 1,386,580  
Shares received upon exercise of warrants   1,116,735 14,927