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Debt and Financing Arrangements - Net Carrying Amount (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Feb. 01, 2021
Jan. 31, 2021
Jun. 25, 2020
Liability Component:        
Principal   $ 287,500    
Equity Component:        
Proceeds allocated to the conversion options (debt discount)     $ 70,768 $ 70,800
Less: issuance costs     (2,290)  
Carrying amount of the equity component     68,478  
Convertible Senior Notes        
Liability Component:        
Principal $ 287,500   287,500  
Less: unamortized debt discount 0   (63,664)  
Less: unamortized issuance costs (7,797)   (6,308)  
Net carrying amount $ 279,703   $ 217,528