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Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Revenue from External Customer [Line Items]
Total revenue	$ 226,474	$ 337,606	$ 331,856
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	119,601	191,692	205,079
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	58,506	73,476	81,623
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	11,949	26,921	18,459
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	25,754	32,901	21,572
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 10,664	$ 12,616	$ 5,123

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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
-Topic 924
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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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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