Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Revenue from External Customer [Line Items]
Total revenue	$ 331,856	$ 222,990	$ 228,732
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	209,044	139,327	137,946
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	81,480	57,270	66,867
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	17,823	9,415	11,134
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	18,191	10,304	8,402
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 5,318	$ 6,674	$ 4,383