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Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 30, 2025 | Apr. 30, 2024
Stock-based compensation: |  |
Total stock-based compensation | $ 26,130 | $ 26,036
Cost of revenue [Member] |  |
Stock-based compensation: |  |
Total stock-based compensation | 951 | 607
Research and development [Member] |  |
Stock-based compensation: |  |
Total stock-based compensation | 17,585 | 17,621
Selling, general and administrative [Member] |  |
Stock-based compensation: |  |
Total stock-based compensation | $ 7,594 | $ 7,808

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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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