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Shareholders' Equity - Allocated Compensation Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
May. 02, 2015
May. 03, 2014
Apr. 27, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense $ 4.3 $ 3.3 $ 3.3
2014 Incentive Plan      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 0.5 0.0 0.0
2014 Incentive Plan | RSAs      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 0.5 0.0 0.0
2010 Stock Plan      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 2.8 2.6 2.5
2010 Stock Plan | RSAs      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 1.5 1.5 1.5
2010 Stock Plan | RSUs      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 0.1 0.3 0.5
2010 Stock Plan | Stock Options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 1.2 0.8 0.5
2007 Stock Plan      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 1.0 0.7 0.8
2007 Stock Plan | RSAs      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense 0.5 0.4 0.2
2007 Stock Plan | Stock Options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Compensation expense $ 0.5 $ 0.3 $ 0.6