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Shareholders' Equity - Stock-based Compensation Expense (Details) - 2014 Incentive Plan - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2021
Aug. 01, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense $ 4.0 $ 0.9
RSUs | Management    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense 2.5  
RSAs | Director    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense $ 1.5 $ 0.9