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Debt - Carrying Value of Liability Component (Details) - Convertible Debt - USD ($)	Jan. 31, 2021	Jan. 31, 2020	Sep. 30, 2018
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Principal	$ 575,000,000	$ 575,000,000	$ 575,000,000.0
Less: extinguishment or conversion	(460,000,000)	0
Unpaid principal	115,000,000	575,000,000
Less: unamortized debt discount	(15,116,000)	(101,461,000)
Less: unamortized transaction costs	(1,224,000)	(8,218,000)
Net carrying value of current and noncurrent liability component	98,660,000	465,321,000
Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Unpaid principal	690,000,000	$ 0
Less: unamortized debt discount	(63,619,000)
Less: unamortized transaction costs	(11,353,000)
Net carrying value of current and noncurrent liability component	$ 615,028,000

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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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