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Marketable Securities - Additional Information (Detail) $ in Thousands	12 Months Ended
	Jan. 31, 2025 USD ($) Security	Jan. 31, 2024 USD ($) Security	Jan. 31, 2023 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Sales and maturities of marketable securities	$ 416,756	$ 347,366	$ 276,650
Total number of securities with unrealized loss positions within the Company's portfolio | Security	262	267
Interest income
Schedule of Available-for-sale Securities [Line Items]
Net realized gain (loss)	$ 92	$ 4	1,465
Amortization of discounts and premiums, net	$ 7,772	$ 4,338	$ 4,512

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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