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Marketable Securities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2023 | Jul. 31, 2022 | Jul. 31, 2023 | Jul. 31, 2022
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Sales and maturities of marketable securities |  |  | $ 149,921 | $ 164,314
Amortization of discounts and premiums, net | $ 894 | $ 1,225 | 1,172 | 2,882
Other (Loss) Income, Net |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Net realized gain (loss) | $ 7 | $ 222 | $ 6 | $ 334

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