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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
Aug. 04, 2019
Jul. 29, 2018
Income Tax Disclosure [Abstract]    
U.S. federal income tax rate 21.00% 21.00%
Global Intangible Low Taxed Income Tax (GILTI) 23.70% 2.50%
Foreign income tax rate differential 10.60% 8.30%
Tax effects of Chinese foreign exchange gains 1.30% 2.10%
Change in estimate of U.S. valuation allowance 1.80% 8.60%
Excess income tax deficiency related to stock-based compensation 0.80% 1.70%
other (0.10%) 2.30%
Effective income tax rate 59.10% 46.50%