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Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024
Stock-based compensation: |  |  |  |
Total stock-based compensation | $ 25,188 | $ 27,612 | $ 51,318 | $ 53,648
Cost of revenue [Member] |  |  |  |
Stock-based compensation: |  |  |  |
Total stock-based compensation | 780 | 833 | 1,731 | 1,440
Research and development [Member] |  |  |  |
Stock-based compensation: |  |  |  |
Total stock-based compensation | 16,972 | 18,395 | 34,557 | 36,016
Selling, general and administrative [Member] |  |  |  |
Stock-based compensation: |  |  |  |
Total stock-based compensation | $ 7,436 | $ 8,384 | $ 15,030 | $ 16,192

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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 S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479983/718-10-S45-1 Reference 2: 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 3: 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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