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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($) | Jul. 29, 2018 | Apr. 29, 2018 | Jul. 30, 2017
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Income Taxes [Line Items] |  |  |
Unrecognized tax benefits | $ 820,000 | $ 844,000 | $ 12,400,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized | 440,000 | 464,000 | 487,000
Non-current Deferred Income Taxes [Member] |  |  |
Income Taxes [Line Items] |  |  |
Unrecognized tax benefits | 380,000 | 380,000 | 11,900,000
Income Taxes Payable - Long-Term [Member] |  |  |
Income Taxes [Line Items] |  |  |
Unrecognized tax benefits | $ 440,000 | $ 464,000 | $ 487,000

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