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Income Taxes - Valuation Allowance - Narrative (Detail) - USD ($)
3 Months Ended
Aug. 02, 2020
Aug. 04, 2019
Income Taxes [Line Items]    
Income tax charge $ 4,324,000 $ 1,692,000
Valuation Allowance, Tax Credit Carryforward [Member]    
Income Taxes [Line Items]    
Income tax charge 271,000  
GILTI [Member]    
Income Taxes [Line Items]    
Non-cash income tax benefit/charges (3,500,000)  
COVID-19 [Member] | GILTI [Member]    
Income Taxes [Line Items]    
Non-cash income tax benefit/charges $ 7,000,000.0