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Stockholders' Equity - Common Stock Reserved For Future Issuance (Details) - shares shares in Thousands	Jan. 31, 2021	Jan. 31, 2020
Class of Stock [Line Items]
Reserved for future issuance (in shares)	54,990	50,839
RSUs
Class of Stock [Line Items]
Reserved for future issuance (in shares)	10,962	14,246
Stock options
Class of Stock [Line Items]
Reserved for future issuance (in shares)	4,798	6,882
ESPP
Class of Stock [Line Items]
Reserved for future issuance (in shares)	6,329	4,985
Remaining shares available for future issuance under the Equity Incentive Plans
Class of Stock [Line Items]
Reserved for future issuance (in shares)	32,901	24,726

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Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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