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Convertible Senior Notes - Notes Due 2024 (Detail)
3 Months Ended 6 Months Ended
Sep. 30, 2019
USD ($)
Jul. 30, 2022
USD ($)
shares
Jul. 31, 2021
USD ($)
Jul. 30, 2022
USD ($)
shares
Jul. 31, 2021
USD ($)
Jan. 29, 2022
USD ($)
Debt Instrument            
Debt amount settled in cash       $ 13,048,000 $ 28,111,000  
Amortization of debt discount         17,461,000  
Loss on extinguishment of debt   $ (23,462,000) $ (3,166,000) $ (169,578,000) $ (3,271,000)  
Shares acquired from notes settlement | shares   1,000,000        
Common Stock            
Debt Instrument            
Shares acquired from notes settlement | shares   1,000,000   1,000,000    
Private Offering            
Debt Instrument            
Discounts upon original issuance   $ 243,000   $ 243,000   $ 37,576,000
2024 Notes            
Debt Instrument            
Debt amount settled in cash       $ 3,600,000    
Shares issued upon conversion | shares       9,760    
Debt instrument, principal amount $ 350,000,000          
Debt instrument, interest rate 0.00%          
Shares acquired from notes settlement | shares       9,760    
2024 Notes | Private Offering            
Debt Instrument            
Discounts upon original issuance   $ 236,000   $ 236,000   $ 31,577,000
2024 Notes | Circumstances (1)            
Debt Instrument            
Debt instrument, convertible trading days 30          
Debt instrument, convertible percentage of stock price 130.00%          
2024 Notes | Circumstances (2)            
Debt Instrument            
Debt instrument, convertible percentage of stock price 98.00%          
Debt instrument, conversion principal amount $ 1,000          
2024 Notes | Circumstances (3)            
Debt Instrument            
Debt instrument, conversion principal amount $ 1,000          
2024 Notes | Maximum | Circumstances (2)            
Debt Instrument            
Debt instrument, convertible consecutive trading days 10          
2024 Notes | Minimum | Circumstances (1)            
Debt Instrument            
Debt instrument, convertible trading days 20          
2024 Notes | Minimum | Circumstances (2)            
Debt Instrument            
Debt instrument, convertible consecutive trading days 5