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Convertible Senior Notes - Carrying Value of Liability Component (Details) - Convertible Senior Notes Due 2023 - Convertible Debt
$ in Thousands
Jul. 31, 2019
USD ($)
Debt Instrument [Line Items]  
Principal $ 575,000
Less: unamortized debt discount (113,845)
Less: unamortized transaction costs (9,221)
Net carrying amount $ 451,934