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Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Income Tax Contingency [Line Items]      
Beginning Balance $ 6,849 $ 9,419 $ 14,572
Additions for tax positions of the current period     337
Additions for tax positions of prior periods     1,644
Reductions due to settlements   (22)  
Reductions for tax positions of prior periods (2,473) (2,548) (7,134)
Ending Balance $ 4,376 $ 6,849 $ 9,419