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Debt - Interest Expense (Details) - Convertible Debt - Convertible Senior Notes Due 2023 - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Debt Instrument [Line Items]
Contractual interest expense	$ 2,773	$ 2,865	$ 1,071
Amortization of debt discount	25,828	24,411	8,795
Amortization of transaction costs	2,173	1,978	712
Total	$ 30,774	$ 29,254	$ 10,578

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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