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Convertible Senior Notes - Notes Due 2023 (Detail) - USD ($)
3 Months Ended
Apr. 30, 2022
May 01, 2021
Jan. 29, 2022
Jun. 30, 2018
Debt Instrument        
Debt amount settled in cash $ 13,048,000 $ 2,035,000    
Gain (loss) on extinguishment of debt (146,116,000) (105,000)    
Amortization of debt discount   $ 8,670,000    
2023 Notes        
Debt Instrument        
Debt amount settled in cash $ 9,400,000      
Shares issued upon conversion 27,213      
Aggregate principal amount, current     $ 9,389,000  
2023 Notes | Convertible note hedges        
Debt Instrument        
Shares issued upon conversion 5      
Shares received upon exercise of warrants 27,208      
2023 Notes | Private Offering        
Debt Instrument        
Debt instrument, principal amount $ 335,000,000     $ 300,000,000
Debt instrument, interest rate       0.00%
2023 Notes | Overallotment option        
Debt Instrument        
Debt instrument, principal amount       $ 35,000,000
2023 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%      
2023 Notes | Circumstances (2)        
Debt Instrument        
Debt instrument, convertible trading days 5      
Debt instrument, convertible consecutive trading days 10      
Debt instrument, convertible percentage of stock price 98.00%      
Debt instrument, conversion principal amount $ 1,000      
2023 Notes | Circumstances (3)        
Debt Instrument        
Debt instrument, conversion principal amount $ 1,000