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Marketable Securities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 30, 2023 | Apr. 30, 2022
Schedule of Available-for-sale Securities [Line Items] |  |
Sales and maturities of marketable securities | $ 69,456 | $ 106,043
Amortization of discounts and premiums, net | 278 | 1,657
Other (Loss) Income, Net |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Net realized gain (loss) | $ 1 | $ 112

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