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Income Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Beginning balance	$ 445,746	$ 282,141	$ 119,153
Valuation allowance charged to income tax provision	269,135	163,605	201,646
Valuation allowance from acquisitions	9,354	0	0
Convertible senior notes settled	14,985	0	0
Convertible senior notes issued	(15,453)	0	(31,594)
Acquisition of SpringCM	0	0	(7,064)
Ending balance	$ 723,767	$ 445,746	$ 282,141

X

- Definition

Deferred Tax Assets, Valuation Allowance, Business Combination

+ References

No definition available.

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- Definition

Deferred Tax Assets, Valuation Allowance, Change In Accounting Method

+ References

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X

- Definition

Deferred Tax Assets, Valuation Allowance, Charges To Provision (Benefit) For Income Taxes

+ References

No definition available.

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X

- Definition

Deferred Tax Assets, Valuation Allowance, Convertible Debt Issued

+ References

No definition available.

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- Definition

Deferred Tax Assets, Valuation Allowance, Convertible Debt Settled

+ References

No definition available.

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- Definition

Deferred Tax Assets, Valuation Allowance [Roll Forward]

+ References

No definition available.

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X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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