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Employee Benefits and Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2023 | Jan. 31, 2022 | Jan. 31, 2021
Stock-based compensation: |  |  |
Total stock-based compensation | $ 111,158 | $ 87,801 | $ 70,134
Cost of revenue [Member] |  |  |
Stock-based compensation: |  |  |
Total stock-based compensation | 3,597 | 1,489 | 1,328
Research and development [Member] |  |  |
Stock-based compensation: |  |  |
Total stock-based compensation | 71,236 | 54,787 | 42,903
Selling, general and administrative [Member] |  |  |
Stock-based compensation: |  |  |
Total stock-based compensation | $ 36,325 | $ 31,525 | $ 25,903

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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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