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, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023
Revenue from External Customer [Line Items]
Total revenue	$ 63,724	$ 62,121	$ 118,197	$ 124,263
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	39,830	33,482	73,515	64,116
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	13,620	15,473	26,370	31,078
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	5,744	2,673	9,943	6,189
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	3,507	8,498	6,277	19,375
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 1,023	$ 1,995	$ 2,092	$ 3,505