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Consolidated Statements of Shareholders' Equity (USD $)
In Millions, except Share data, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income
Treasury Stock
Retained Earnings
Non-Controlling Interest
Eetrex
Eetrex
Additional Paid-in Capital
Eetrex
Non-Controlling Interest
Balance at Apr. 30, 2011 $ 261.1 $ 19.2 $ 72.1 $ 23.1 $ (11.4) $ 156.0 $ 2.1      
Balance, shares at Apr. 30, 2011   38,312,243                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Earned portion of restircted stock awards, shares   32,860                
Earned portion of restricted stock awards 0 0 0              
Stock award and stock option amortization expense 4.0   4.0              
Vested stock awards withheld for payroll taxes, shares   (1,400)                
Vested stock awards withheld for payroll taxes 0 0 0              
Exercise of options, shares   31,975                
Exercise of options 0.2 0 0.2              
Purchase of non-controlling interest               0 1.3 (1.3)
Noncontrolling Interest, Increase from Sale of Parent Equity Interest (0.4)           (0.4)      
Foreign currency translation adjustments (7.5)     (7.5)     0      
Net income/(loss) for year 8.2         8.4 (0.2)      
Cash dividends on common stock (10.4)         (10.4)        
Balance at Apr. 28, 2012 255.2 19.2 77.6 15.6 (11.4) 154.0 0.2      
Balance, shares at Apr. 28, 2012   38,375,678                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Earned portion of restircted stock awards, shares   27,000                
Earned portion of restricted stock awards 0 0 0              
Stock award and stock option amortization expense 3.3   3.3              
Exercise of options, shares   53,175                
Exercise of options 0.6 0 0.6              
Foreign currency translation adjustments 0.1     0.1     0      
Net income/(loss) for year 40.7         40.7 0      
Cash dividends on common stock (10.3)         (10.3)        
Balance at Apr. 27, 2013 289.6 19.2 81.5 15.7 (11.4) 184.4 0.2      
Balance, shares at Apr. 27, 2013   38,455,853                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Earned portion of restircted stock awards, shares   27,000                
Earned portion of restricted stock awards 0 0 0              
Stock award and stock option amortization expense 3.3   3.3              
Exercise of options, shares   779,315                
Exercise of options 5.0 0.4 4.6              
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation 0.4   0.4              
Foreign currency translation adjustments 9.0     9.0     0      
Net income/(loss) for year 96.2         96.1 0.1      
Cash dividends on common stock (11.3)         (11.3)        
Balance at May. 03, 2014 $ 392.2 $ 19.6 $ 89.8 $ 24.7 $ (11.4) $ 269.2 $ 0.3      
Balance, shares at May. 03, 2014   39,262,168