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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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