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Convertible Senior Notes - Carrying Value of Liability Component (Details) - Convertible Senior Notes Due 2023 - Convertible Debt
$ in Thousands
Apr. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Principal $ 575,000
Less: unamortized debt discount (119,903)
Less: unamortized transaction costs (9,712)
Net carrying amount $ 445,385