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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($) | Aug. 04, 2019 | Apr. 28, 2019 | Jul. 29, 2018
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Income Taxes [Line Items] |  |  |
Unrecognized tax benefits |  | $ 903,000 | $ 820,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized | $ 914,000 | 523,000 | 440,000
Non-current Deferred Income Taxes [Member] |  |  |
Income Taxes [Line Items] |  |  |
Unrecognized tax benefits |  | 380,000 | 380,000
Income Taxes Payable - Long-Term [Member] |  |  |
Income Taxes [Line Items] |  |  |
Unrecognized tax benefits | $ 914,000 | $ 523,000 | $ 440,000

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