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Shareholders' Equity - Allocated Compensation Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2016
May 02, 2015
May 03, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense $ 7.4 $ 4.3 $ 3.3
2014 Incentive Plan      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 6.4 0.5 0.0
2014 Incentive Plan | RSAs      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 3.6 0.5 0.0
2014 Incentive Plan | RSUs      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 2.8 0.0 0.0
2010 Stock Plan      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 0.4 2.8 2.6
2010 Stock Plan | RSAs      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 0.0 1.5 1.5
2010 Stock Plan | RSUs      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 0.1 0.1 0.3
2010 Stock Plan | Stock Options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 0.3 1.2 0.8
2007 Stock Plan      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 0.6 1.0 0.7
2007 Stock Plan | RSAs      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 0.0 0.5 0.4
2007 Stock Plan | Stock Options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense $ 0.6 $ 0.5 $ 0.3