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GOODWILL AND INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Apr. 28, 2012
Goodwill [Roll Forward]          
Balance $ 16,422 $ 16,422 $ 16,422 $ 16,422  
Attributable to acquisitions 794 0 794 0  
Balance 17,216 16,422 17,216 16,422  
Gross 42,414   42,414   41,249
Accumulated Amortization 24,932   24,932   24,629
Net 17,482   17,482   16,620
Indefinite-lived trade names 1,800   1,800   1,800
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]          
2013 1,738   1,738    
2014 1,815   1,815    
2015 1,747   1,747    
2016 1,538   1,538    
2017 1,474   1,474    
Customer relationships and agreements
          
Goodwill [Roll Forward]          
Gross 16,522   16,522   14,995
Accumulated Amortization 13,853   13,853   13,720
Net 2,669   2,669   1,275
Wtd. Avg. Remaining Amortization Periods 11 years 2 months 12 days   11 years 2 months 12 days   11 years 8 months 12 days
Trade names, patents and technology licences
          
Goodwill [Roll Forward]          
Gross 25,774   25,774   25,774
Accumulated Amortization 11,079   11,079   10,429
Net 14,695   14,695   15,345
Wtd. Avg. Remaining Amortization Periods 11 years 3 months 18 days   11 years 3 months 18 days   11 years 9 months 18 days
Covenants not to compete
          
Goodwill [Roll Forward]          
Write-off of fully amortized intangible assets 480        
Gross 118   118   480
Accumulated Amortization 0   0   480
Net 118   118   0
Interconnect
          
Goodwill [Roll Forward]          
Balance 11,146 11,146 11,146 11,146  
Attributable to acquisitions 794 0 794 0  
Balance 11,940 11,146 11,940 11,146  
Power Products
          
Goodwill [Roll Forward]          
Balance 5,276 5,276 5,276 5,276  
Attributable to acquisitions 0 0 0 0  
Balance $ 5,276 $ 5,276 $ 5,276 $ 5,276