Convertible Senior Notes and Related Transactions - Components of Debt (Details) - Senior Notes - 2.00% Convertible Senior Notes Due 2024 - USD ($) $ in Thousands	Oct. 31, 2020	Feb. 01, 2020
Debt Instrument [Line Items]
Principal	$ 300,000	$ 300,000
Unamortized debt discount	(41,221)	(49,017)
Unamortized issuance costs	(2,978)	(3,620)
Net carrying amount	255,801	247,363
Equity component, net	$ 42,320	$ 42,320

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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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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