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Fair Value Measurements - Convertible Senior Notes (Details) - Convertible Debt - USD ($) $ in Thousands	Jan. 31, 2021	Jan. 31, 2020	Sep. 30, 2018
Convertible Senior Notes Due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unpaid principal	$ 115,000	$ 575,000
Debt interest rate percentage			0.50%
Convertible Senior Notes Due 2023 | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible debt, fair value disclosures	373,928	743,504
Convertible Senior Notes Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unpaid principal	$ 690,000	0
Debt interest rate percentage	0.00%
Convertible Senior Notes Due 2024 | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible debt, fair value disclosures	$ 725,100	$ 0

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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

No definition available.

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- Definition

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.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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