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Income Taxes - Income Tax Expense (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 28, 2019
Apr. 29, 2018
Apr. 30, 2017
Income Tax Disclosure [Abstract]      
2017 Tax Cuts and Jobs Act income tax benefit [1] $ (268) $ (6,903)  
establishment of valuation allowance [2]   4,550  
income tax benefit [1] (4,456) $ 116 $ (54)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 4,500    
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount 4,500    
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount $ 3,800    
[1] The income tax benefit of $6,903 recorded during fiscal 2018 included a charge of $4,550 for the establishment of a valuation allowance against U.S. foreign tax credits that were not more-likely-than not to be realized as a result of the 2017 Tax Cuts and Jobs Act. During fiscal 2019, we recorded an income tax charge of $4.5 million for the write-off of certain U.S. foreign tax credits, and in turn, we recorded an income tax benefit of $4.5 million for the reduction in our valuation allowance. The $4.5 million income charge for the write-off of certain U.S. foreign tax credits is included in the undistributed earnings - foreign subsidiaries income tax expense amount of $3.8 million.
[2] The establishment of this valuation allowance pertains to U.S. foreign tax credits that were not more-likely-than not to be realized as a result of the Tax Act.