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Consolidated Statements of Shareholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income
Treasury Stock
Retained Earnings
Non-Controlling Interest
Hectronic Swiss
Hectronic Swiss
Non-Controlling Interest
Optokon
Optokon
Accumulated Other Comprehensive Income
Optokon
Non-Controlling Interest
Eetrex
Eetrex
Additional Paid-in Capital
Eetrex
Non-Controlling Interest
Balance at May. 01, 2010 $ 239,942 $ 19,075 $ 65,991 $ 16,247 $ (11,377) $ 146,818 $ 3,188                
Balance, shares at May. 01, 2010   38,149,946                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Earned portion of restircted stock awards, shares   47,600                          
Earned portion of restricted stock awards (22) 24 (46)                        
Stock award and stock option amortization expense 3,006   3,006                        
Vested stock awards withheld for payroll taxes, shares   (5,378)                          
Vested stock awards withheld for payroll taxes 0 (3) 3                        
Exercise of options, shares   150,075                          
Exercise of options 1,028 75 953                        
Treasury shares issued for minority shares purchased, shares   (30,000)                          
Treasury shares issues for minority shares purchased 0 (15) 15   0                    
Purchase of non-controlling interest               29 29       4,366 2,191 2,175
Sale of non-controlling interest                   (7,313) (4,057) (3,256)      
Foreign currency translation adjustments 11,244     10,962     282                
Net income/(loss) for year 19,193         19,500 (307)                
Cash dividends on common stock (10,329)         (10,329)                  
Balance at Apr. 30, 2011 261,144 19,156 72,113 23,152 (11,377) 155,989 2,111                
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 (10) 18 (28)                        
Stock award and stock option amortization expense 3,976   3,976                        
Vested stock awards withheld for payroll taxes, shares   (1,400)                          
Vested stock awards withheld for payroll taxes 0 (2) 2                        
Exercise of options, shares   31,975                          
Exercise of options 263 16 247                        
Purchase of non-controlling interest                         0 1,342 (1,342)
Sale of non-controlling interest (615)           (615)                
Foreign currency translation adjustments (7,589)     (7,579)     (10)                
Net income/(loss) for year 8,137                            
Net income/(loss) for the year (including mezzanine equity) 8,419         8,383 36                
Cash dividends on common stock (10,364)         (10,364)                  
Balance at Apr. 28, 2012 255,224 19,188 77,652 15,573 (11,377) 154,008 180                
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 14 (14)                        
Stock award and stock option amortization expense 3,252   3,252                        
Exercise of options, shares   53,175                          
Exercise of options 608 26 582                        
Foreign currency translation adjustments 101     107     (6)                
Net income/(loss) for year 40,444                            
Net income/(loss) for the year (including mezzanine equity) 40,777           39                
Cash dividends on common stock (10,378)         (10,378)                  
Balance at Apr. 27, 2013 $ 289,584 $ 19,228 $ 81,472 $ 15,680 $ (11,377) $ 184,368 $ 213                
Balance, shares at Apr. 27, 2013   38,455,853