Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	3 Months Ended
Apr. 30, 2026	Apr. 30, 2025
Revenue from External Customer [Line Items]
Total revenue	$ 100,357	$ 85,872
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	60,980	53,899
Asia Pacific other than Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	23,247	16,559
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	6,308	8,739
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	7,904	5,145
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 1,918	$ 1,530

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details