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, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Revenue from External Customer [Line Items]
Total revenue	$ 50,595	$ 83,096	$ 174,858	$ 254,285
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	27,179	51,306	91,295	150,595
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	14,300	15,309	45,378	54,724
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	2,869	5,310	9,058	18,472
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	5,032	8,870	24,407	21,930
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 1,215	$ 2,301	$ 4,720	$ 8,564