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Income Taxes - Differences Between Income Tax Expense at Federal Income Tax Rate and Effective Income Tax Rate (Detail)
6 Months Ended 12 Months Ended
Oct. 28, 2018
Oct. 29, 2017
Apr. 29, 2018
Income Tax Disclosure [Abstract]      
Federal income tax rate 21.00% 34.00% 30.40%
Foreign income tax rate differential 7.80% 1.10%  
Tax effects of Chinese foreign exchange (losses) gains 2.80% (1.50%)  
Global Intangible Low Taxed Income Tax (GILTI) 2.10%    
Change in estimate of valuation allowance 1.20% 0.70%  
Excess income tax deficiency (benefits) related to stock-based compensation 0.50% (4.30%)  
Other (0.30%) (0.90%)  
Effective income tax rate 35.10% 29.10%