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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($) $ in Thousands	Jan. 27, 2019	Apr. 29, 2018	Jan. 28, 2018
Income Taxes [Line Items]
Unrecognized tax benefits	$ 880	$ 844	$ 12,400
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized	500	464	9,900
Non-current Deferred Income Taxes [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	380	380	2,500
Income Taxes Payable - Long-Term [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	$ 500	$ 464	$ 9,900

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Income Taxes [Line Items]

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
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-Section 50
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-Section 50
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