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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($) $ in Thousands | Oct. 28, 2018 | Apr. 29, 2018 | Oct. 29, 2017
--- | --- | --- | ---
Income Taxes [Line Items] |  |  |
Unrecognized tax benefits | $ 820 | $ 844 | $ 12,600
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized | 440 | 464 | 487
Non-current Deferred Income Taxes [Member] |  |  |
Income Taxes [Line Items] |  |  |
Unrecognized tax benefits | 380 | 380 | 12,100
Income Taxes Payable - Long-Term [Member] |  |  |
Income Taxes [Line Items] |  |  |
Unrecognized tax benefits | $ 440 | $ 464 | $ 487

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