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, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Revenue from External Customer [Line Items]
Total revenue	$ 83,096	$ 92,167	$ 254,285	$ 241,627
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	54,443	59,412	157,884	153,135
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	15,292	21,323	54,691	60,122
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	5,295	4,432	18,167	11,837
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	5,748	5,984	15,020	13,117
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 2,318	$ 1,016	$ 8,523	$ 3,416