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Income Taxes - Differences Between Income Tax Expense at Federal Income Tax Rate and Effective Income Tax Rate (Detail) | 3 Months Ended | 12 Months Ended
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Jul. 29, 2018 | Jul. 30, 2017 | Apr. 29, 2018
Income Tax Disclosure [Abstract] |  |  |
Federal income tax rate | 21.00% | 34.00% | 30.40%
Change in estimate of U.S. valuation allowance | 8.60% | 1.40% |
Foreign income tax rate differential | 8.30% | (1.30%) |
Global Intangible Low Taxed Income Tax (GILTI) | 2.50% |  |
Tax effects of Chinese foreign exchange (losses) gains | 2.10% | (0.90%) |
Excess income tax deficiency (benefits) related to stock-based compensation | 1.70% | (8.20%) |
Other | 2.30% | (0.70%) |
Effective income tax rate | 46.50% | 24.30% |

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- Definition Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax deficiency (benefit) for share-based compensation cost. + References No definition available. + Details
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