Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Revenue from External Customer [Line Items]
Total revenue	$ 54,473	$ 62,142
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	33,685	30,634
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	12,750	15,605
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	4,199	3,516
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	2,770	10,877
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 1,069	$ 1,510