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Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Revenue from External Customer [Line Items]
Total revenue	$ 95,511	$ 63,724	$ 181,383	$ 118,197
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	68,137	39,830	122,036	73,515
Asia Pacific other than Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	17,789	13,620	34,348	26,370
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	4,690	5,744	13,429	9,943
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	4,197	3,507	9,342	6,277
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 698	$ 1,023	$ 2,228	$ 2,092

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