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Income Taxes - Summary of Valuation Allowances Against Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Jan. 27, 2019	Apr. 29, 2018	Jan. 28, 2018
Valuation Allowance [Line Items]
Valuation allowance	$ 5,453	$ 5,204	$ 2,845
U.S. State Tax [Member] | Loss Carryforwards and Credits [Member]
Valuation Allowance [Line Items]
Valuation allowance	903	578	495
Internal Revenue Service (IRS) [Member] | Income Tax Credits [Member]
Valuation Allowance [Line Items]
Valuation allowance	$ 4,550	4,550	2,277
Poland [Member] | Loss Carryforwards [Member]
Valuation Allowance [Line Items]
Valuation allowance		$ 76	$ 73

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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