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Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	May 02, 2020	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Tax Credit Carryforward [Line Items]
Foreign Investment Tax Credit	$ 0.8	$ 2.0	$ 9.8
Change in Tax Reserve	2.2	(0.1)	0.1
Foreign withholding taxes	2.3
Income tax expense (benefit)	$ 25.3	$ 12.0	$ 66.6
Income tax at statutory rate (as a percent)	21.00%	21.00%	30.50%	35.00%
Deferred tax liabilities	$ 10.2	$ 2.1
Valuation allowance	7.0	6.3
Gross unrecognized tax benefits	5.2	3.1	$ 1.4
Federal
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	7.9
Federal income tax benefit	5.3
State
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	4.7
Federal income tax benefit	1.7
Foreign tax authority
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	$ 0.3
Foreign tax authority | Investment Tax Credit Carryforward | Malta
Tax Credit Carryforward [Line Items]
Percentage of qualified expenditures subject to investment tax credit	30.00%
Foreign tax authority | Tax Credit Carryforward, Period, Indefinite | Investment Tax Credit Carryforward | Malta
Tax Credit Carryforward [Line Items]
Total unused credits	$ 25.9
Impact of U.S. Tax Reform
Tax Credit Carryforward [Line Items]
Income tax expense (benefit)		$ (4.8)	$ 53.7

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