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Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2022 | Oct. 31, 2021
Stock-based compensation: |  |  |  |
Total stock-based compensation | $ 28,101 | $ 22,053 | $ 82,051 | $ 60,267
Cost of revenue [Member] |  |  |  |
Stock-based compensation: |  |  |  |
Total stock-based compensation | 360 | 391 | 1,071 | 1,073
Research and development [Member] |  |  |  |
Stock-based compensation: |  |  |  |
Total stock-based compensation | 18,741 | 13,725 | 53,775 | 36,444
Selling, general and administrative [Member] |  |  |  |
Stock-based compensation: |  |  |  |
Total stock-based compensation | $ 9,000 | $ 7,937 | $ 27,205 | $ 22,750

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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