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Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2023 | Oct. 31, 2022
Stock-based compensation: |  |  |  |
Total stock-based compensation | $ 27,409 | $ 28,101 | $ 82,796 | $ 82,051
Cost of revenue [Member] |  |  |  |
Stock-based compensation: |  |  |  |
Total stock-based compensation | 868 | 360 | 2,694 | 1,071
Research and development [Member] |  |  |  |
Stock-based compensation: |  |  |  |
Total stock-based compensation | 17,898 | 18,741 | 54,809 | 53,775
Selling, general and administrative [Member] |  |  |  |
Stock-based compensation: |  |  |  |
Total stock-based compensation | $ 8,643 | $ 9,000 | $ 25,293 | $ 27,205

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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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