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Income Taxes - Differences Between Income Tax Expense at Federal Income Tax Rate and Effective Income Tax Rate (Detail)	9 Months Ended		12 Months Ended
	Jan. 27, 2019	Jan. 28, 2018	Apr. 29, 2018
Income Tax Disclosure [Abstract]
Federal income tax rate	21.00%	30.40%	30.40%
Tax effects of the 2017 Tax Cuts and Jobs Act	(5.70%)	28.40%
Foreign income tax rate differential	10.10%	3.90%
Global Intangible Low Taxed Income Tax (GILTI)	2.60%
Tax effects of Chinese foreign exchange gains (losses)	1.40%	(2.90%)
Excess income tax deficiency (benefits) related to stock-based compensation	0.70%	(2.30%)
Other	2.40%	1.10%
Effective income tax rate	32.50%	58.60%

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- 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 reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017.

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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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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 other adjustments.

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