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Income Taxes - Unrecognized Tax Benefits Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross amount of unrecognized tax benefits as of the beginning of the year	$ 23,931	$ 11,719	$ 5,775
Additions based on tax positions related to a prior year	658	1,859	0
Additions based on tax positions related to current year	6,866	10,353	5,944
Reductions based on tax positions related to current year	0	0	0
Reductions based on tax positions taken in a prior year	(15,468)	0	0
Gross amount of unrecognized tax benefits as of the end of the year	$ 15,987	$ 23,931	$ 11,719

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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