Income Taxes - Valuation Allowance - Narrative (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Jan. 31, 2021	Aug. 02, 2020	Feb. 02, 2020	Jan. 31, 2021	Feb. 02, 2020
Income Taxes [Line Items]
Income tax charge	$ 899,000		$ 1,619,000	$ 6,836,000	$ 5,590,000
Valuation Allowance, Net Deferred Tax Assets [Member]
Income Taxes [Line Items]
Income tax charge				714,000
Valuation Allowance, Net Deferred Tax Assets [Member] | GILTI [Member]
Income Taxes [Line Items]
Income tax charge		$ 7,000,000.0		$ 7,000,000.0