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Marketable Securities - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Jan. 31, 2024 USD ($) Security | Jan. 31, 2023 USD ($) Security | Jan. 31, 2022 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |
Sales and maturities of marketable securities | $ 347,366 | $ 276,650 | $ 280,701
Amortization of discounts and premiums, net | $ 4,338 | $ 4,512 | 6,614
Total number of securities with unrealized loss positions within the Company's portfolio | Security | 267 | 262 |
Interest income |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Net realized gain (loss) | $ 4 | $ 1,465 | $ 11

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