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Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Revenue from External Customer [Line Items]
Total revenue	$ 62,121	$ 80,884	$ 124,263	$ 171,189
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	33,482	48,132	64,116	99,289
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	15,473	17,858	31,078	39,415
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	2,673	4,536	6,189	13,162
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	8,498	5,991	19,375	13,060
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 1,995	$ 4,367	$ 3,505	$ 6,263

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 606
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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