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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

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt discount.

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