Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Revenue from External Customer [Line Items]
Total revenue	$ 82,653	$ 50,595	$ 200,850	$ 174,858
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	54,612	27,179	128,127	91,295
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	15,733	14,300	42,103	45,378
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	5,991	2,869	15,934	9,058
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	5,756	5,032	12,033	24,407
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 561	$ 1,215	$ 2,653	$ 4,720