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Income Taxes - Summary of Taxes Paid (Refunded) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2021	Nov. 01, 2020
Income Taxes [Line Items]
United States Federal - Alternative Minimum Tax (AMT) credit refunds		$ 1,500
Total income tax payments, net	$ 2,101	(556)
Domestic Tax Authority [Member] | United States [Member]
Income Taxes [Line Items]
United States Federal - Alternative Minimum Tax (AMT) credit refunds		(1,509)
United States Transition Tax Payment	266	227
Foreign Tax Authority | China [Member]
Income Taxes [Line Items]
Total income tax payments, net	921	349
China - Withholding Taxes Associated with Earnings and Profits Distribution to U.S. Parent	487
Foreign Tax Authority | Canada [Member]
Income Taxes [Line Items]
Total income tax payments, net	$ 427	$ 377

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Income Taxes [Line Items]

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Income taxes refunded amount.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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