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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
	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%

X

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign exchange gain or loss.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to Global Intangible Low Taxed Income Tax (GILTI).

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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.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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