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Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 26, 2019
Jan. 27, 2018
Jan. 26, 2019
Jan. 27, 2018
Apr. 28, 2018
Income Tax Disclosure [Abstract]          
Effective income tax rate 17.40% (170.00%) 21.00% (20.90%)  
Blended income tax rate, percent         30.50%
Tax Cuts And Jobs Act Of 2017,incomplete accounting, provisional income tax benefit     $ (331)   $ (76,648)
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, deferred taxes, provisional income tax expense         81,871
Tax Cuts And Jobs Act Of 2017, incomplete accounting, transition tax for unremitted foreign earnings         (4,006)
Tax Cuts And Jobs Act of 2017, incomplete Accounting, transition tax withholding associated with repatriation of foreign earnings         $ 1,217
Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Deferred Tax Assets, Provisional Income Tax Expense (Benefit) $ 2,355