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Convertible Senior Notes - Notes Due 2024 (Detail) - USD ($)
3 Months Ended
Apr. 30, 2022
May 01, 2021
Sep. 30, 2019
Debt Instrument      
Debt amount settled in cash $ 13,048,000 $ 2,035,000  
Amortization of debt discount   8,670,000  
Gain (loss) on extinguishment of debt (146,116,000) $ (105,000)  
2024 Notes      
Debt Instrument      
Debt amount settled in cash $ 3,600,000    
Shares issued upon conversion 9,760    
Debt instrument, principal amount     $ 350,000,000
Shares acquired from notes settlement 9,760    
2024 Notes | Private Offering      
Debt Instrument      
Debt instrument, principal amount     $ 350,000,000
Debt instrument, interest rate     0.00%
2024 Notes | Circumstances (1)      
Debt Instrument      
Debt instrument, convertible trading days 20    
Debt instrument, convertible consecutive trading days 30    
Debt instrument, convertible percentage of stock price 130.00%    
2024 Notes | Circumstances (2)      
Debt Instrument      
Debt instrument, convertible trading days 5    
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