Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Revenue from External Customer [Line Items]
Total revenue	$ 284,865	$ 226,474	$ 337,606
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	179,324	119,601	191,692
Asia Pacific other than Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	61,663	58,506	73,476
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	22,778	11,949	26,921
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	18,074	25,754	32,901
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 3,026	$ 10,664	$ 12,616