Shareholders' Equity - Stock-based Compensation Expense (Details) - 2014 Incentive Plan - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 28, 2023	Oct. 29, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 1.3	$ 2.7	$ 3.9	$ 6.7
RSUs | Management
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 1.3	$ 2.7	2.3	5.1
RSUs | Non-employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense			0.6	0.6
RSUs | Deferred Non-Employee Director Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense			$ 1.0	$ 1.0