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Marketable Securities - Additional Information (Detail) $ in Thousands	12 Months Ended
	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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