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Shareholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2007
May. 02, 2015
May. 03, 2014
Apr. 27, 2013
Apr. 28, 2012
Apr. 30, 2011
Jul. 15, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock - par value per share (in dollars per share)   $ 0.50 $ 0.50        
Dividends paid   $ 13.8 $ 11.3 $ 10.3      
Compensation expense   4.3 3.3 3.3      
Unrecognized equity-based compensation cost   $ 1.5          
Weighted average period for recognition of unrecognized equity-based compensation cost   1 year 11 months 28 days          
2014 Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized for grant (in shares)             3,000,000
Contingent reduction in number of shares authorized for grant (in shares)             1
Number of shares available for grant (in shares)   2,986,500          
Compensation expense   $ 0.5 0.0 0.0      
2014 Incentive Plan | RSAs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares issued (in shares)   13,500          
Compensation expense   $ 0.5 $ 0.0 $ 0.0      
2010 Stock Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized for grant (in shares)   2,000,000          
Awarded options to purchase number of shares (in shares)   108,000 120,000 120,000      
Compensation expense   $ 2.8 $ 2.6 $ 2.5      
2010 Stock Plan | RSAs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage         33.30%    
Awarded shares (in shares)   0 0 0 100,000 640,000  
Historic multiple of EBITDA, used to calculate internal enterprise value for determining size of awards         7.5 7.5  
Compensation expense   $ 1.5 $ 1.5 $ 1.5      
2010 Stock Plan | Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awarded options to purchase number of shares (in shares)   108,000 120,000 120,000      
Award term   10 years          
Annual vesting percentage   33.30%          
Award vesting period   3 years          
Intrinsic value of outstanding options   $ 4.6          
Compensation expense   $ 1.2 $ 0.8 $ 0.5      
2010 Stock Plan | RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage           20.00%  
Awarded shares (in shares)   0 0 0   320,000  
Award vesting percentage           100.00%  
Compensation expense   $ 0.1 $ 0.3 $ 0.5      
2010 Stock Plan | Bonus in Lieu of Dividends              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restriction period for awards   5 years          
2010 Stock Plan | Tandem Cash Award              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum percentage of RSA award that could be the value of Tandem Cash Award   40.00%          
Compensation expense   $ 5.6 3.9 2.1      
2007 Stock Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized for grant (in shares)   1,250,000          
Compensation expense   $ 1.0 $ 0.7 $ 0.8      
Total number of shares with respect to which awards may granted to any participant in any calendar year   200,000          
2007 Stock Plan | RSAs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares issued (in shares)   13,500 27,000 27,000      
Awarded shares (in shares)   13,500 27,000 27,000      
Compensation expense   $ 0.5 $ 0.4 $ 0.2      
Number of shares converted from RSAs to RSUs outstanding (in shares)       0      
2007 Stock Plan | Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awarded options to purchase number of shares (in shares)   50,500 42,500 42,500      
Award term   10 years          
Annual vesting percentage   33.30%          
Intrinsic value of outstanding options   $ 2.1          
Compensation expense   $ 0.5 $ 0.3 $ 0.6      
2007 Stock Plan | RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares converted from RSAs to RSUs outstanding (in shares)   212,325          
Number of day after termination that awards will be issued and delivered 30 days            
Converted RSUs delivered (in shares)   12,675          
2007 Stock Plan | Converted from RSAs to RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares converted from RSAs to RSUs outstanding (in shares) 225,000            
2000 and 2004 Stock Plans | Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awarded options to purchase number of shares (in shares)     0 0      
Number of shares granted in previous years that are currently outstanding and exercisable (in shares)   0          
Number of options expired during the period (in shares)     1,410 128,105