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Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Revenue from External Customer [Line Items]
Total revenue	$ 108,452	$ 82,653	$ 289,835	$ 200,850
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	75,961	54,612	197,997	128,127
Asia Pacific other than Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	20,177	15,733	54,525	42,103
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	3,181	5,991	16,610	15,934
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	7,353	5,756	16,695	12,033
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 1,780	$ 561	$ 4,008	$ 2,653

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