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Income Taxes - Effective Income Tax Rate - Narrative (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jan. 26, 2025
Jan. 28, 2024
Jan. 26, 2025
Jan. 28, 2024
Income Taxes [Line Items]        
Income taxes $ 446,000 $ 1,027,000 $ 635,000 $ 2,244,000
Effective income tax rate     (3.90%) (33.40%)
Pre-tax income (loss) $ (3,680,000) $ (2,161,000) $ (16,396,000) $ (6,710,000)
U.S.        
Income Taxes [Line Items]        
Pre-tax income (loss)     $ (16,800,000) $ (11,300,000)