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Stockholders' Equity - Common Stock Reserved For Future Issuance (Details) - shares shares in Thousands | Jan. 31, 2021 | Jan. 31, 2020
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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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- Definition 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 + Details
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