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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, 2024 | Jan. 31, 2023 | Jan. 31, 2022
Stock-based compensation: |  |  |
Total stock-based compensation | $ 111,316 | $ 111,158 | $ 87,801
Cost of revenue [Member] |  |  |
Stock-based compensation: |  |  |
Total stock-based compensation | 3,341 | 3,597 | 1,489
Research and development [Member] |  |  |
Stock-based compensation: |  |  |
Total stock-based compensation | 72,759 | 71,236 | 54,787
Selling, general and administrative [Member] |  |  |
Stock-based compensation: |  |  |
Total stock-based compensation | $ 35,216 | $ 36,325 | $ 31,525

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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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