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Fair Value Measurements Schedule of Carrying Amounts and Estimated Fair Values of Convertible Note (Details) - Senior Notes $ in Thousands | Jan. 31, 2020 USD ($)
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Net Carrying Amount | Convertible Senior Notes Due 2023 |
Debt Instrument [Line Items] |
Convertible senior notes value | $ 102,543
Net Carrying Amount | Convertible Senior Notes Due 2025 |
Debt Instrument [Line Items] |
Convertible senior notes value | 851,535
Estimated Fair Value | Convertible Senior Notes Due 2023 |
Debt Instrument [Line Items] |
Convertible senior notes value | 331,014
Estimated Fair Value | Convertible Senior Notes Due 2025 |
Debt Instrument [Line Items] |
Convertible senior notes value | $ 1,074,840

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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