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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
Apr. 28, 2019
Jan. 27, 2019
Oct. 28, 2018
Jul. 29, 2018
Apr. 29, 2018
Jan. 28, 2018
Oct. 29, 2017
Jul. 30, 2017
Apr. 28, 2019
Apr. 29, 2018
Apr. 30, 2017
Income Tax Disclosure [Abstract]                      
federal income tax rate                 21.00% 30.40% 34.00%
undistributed earnings from foreign subsidiaries                 37.20%    
valuation allowance                 (37.10%) 0.40% (0.20%)
global intangible low taxed income tax (GILTI)                 17.90%    
foreign tax rate differential                 13.70% 3.70%  
tax effects of the 2017 Tax Cuts and Jobs Act                 (4.60%) (7.60%)  
tax effects of Chinese foreign exchange gains(losses)                 2.30% (2.80%) 1.60%
reversal of foreign uncertain income tax position                     (11.60%)
tax effects of stock-based compensation                 0.60% (1.80%)  
other                 2.60% (0.90%) 0.90%
Effective income tax rate 199.70% 28.70% 29.80% 46.50% (96.10%) 109.20% 34.20% 24.30% 53.60% 21.40% 24.70%