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Marketable Securities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2022 | Oct. 31, 2021
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Sales and maturities of marketable securities |  |  | $ 230,745 | $ 237,879
Amortization of discounts and premiums, net | $ 1,037 | $ 1,804 | 3,919 | 4,540
Other (Loss) Income, Net |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Net realized gain (loss) | $ (1,131) | $ 9 | $ (1,465) | $ 13

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