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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 ($)
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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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.

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