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Income Taxes - Summary of Valuation Allowances Against Deferred Income Taxes (Detail) - USD ($)
$ in Thousands
Aug. 04, 2019
Apr. 28, 2019
Jul. 29, 2018
Valuation Allowance [Line Items]      
Valuation allowance $ 711 $ 748 $ 5,399
U.S. State Tax [Member] | Loss Carryforwards and Credits [Member]      
Valuation Allowance [Line Items]      
Valuation allowance $ 711 666 849
Internal Revenue Service (IRS) [Member] | Income Tax Credits [Member]      
Valuation Allowance [Line Items]      
Valuation allowance   $ 82 $ 4,550