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SEGMENT INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
segment
Oct. 29, 2011
Segment Reporting [Abstract]        
Number of reportable segments     4  
Segment Reporting Information [Line Items]        
Income from litigation settlement $ 20,000 $ 0 $ 20,000 $ 0
Net sales 129,758 115,890 248,496 226,695
Transfers between segments 0 0 0 0
Net sales to unaffiliated customers 129,758 115,890 248,496 226,695
Income (loss) from operations 27,115 2,640 31,285 4,061
Interest (income)/expense, net 53 1 7 5
Other (income)/expense, net 536 194 495 152
Income/(loss) before income taxes 26,526 2,445 30,783 3,904
Automotive
        
Segment Reporting Information [Line Items]        
Income from litigation settlement 20,000   20,000  
Net sales 80,298 68,663 151,606 132,330
Transfers between segments (145) (1,120) (408) (2,110)
Net sales to unaffiliated customers 80,153 67,543 151,198 130,220
Income (loss) from operations 26,487 3,237 29,147 5,482
Interest (income)/expense, net (142) (89) (308) (159)
Other (income)/expense, net 805 (17) 104 18
Income/(loss) before income taxes 25,824 3,343 29,351 5,623
Interconnect
        
Segment Reporting Information [Line Items]        
Net sales 33,986 32,276 66,270 65,790
Transfers between segments (736) (754) (1,305) (1,880)
Net sales to unaffiliated customers 33,250 31,522 64,965 63,910
Income (loss) from operations 4,130 3,700 9,004 7,997
Interest (income)/expense, net (57) 0 (141) 21
Other (income)/expense, net (260) 430 406 730
Income/(loss) before income taxes 4,447 3,270 8,739 7,246
Power Products
        
Segment Reporting Information [Line Items]        
Net sales 12,573 13,690 24,740 26,582
Transfers between segments (57) (10) (105) (56)
Net sales to unaffiliated customers 12,516 13,680 24,635 26,526
Income (loss) from operations (260) 831 51 1,052
Interest (income)/expense, net 25 0 38 0
Other (income)/expense, net 30 35 24 131
Income/(loss) before income taxes (315) 796 (11) 921
Other
        
Segment Reporting Information [Line Items]        
Net sales 3,852 3,225 7,745 6,170
Transfers between segments (13) (34) (39) (49)
Net sales to unaffiliated customers 3,839 3,191 7,706 6,121
Income (loss) from operations 599 (225) 1,548 (1,225)
Interest (income)/expense, net 0 0 0 0
Other (income)/expense, net 1 0 1 3
Income/(loss) before income taxes 598 (225) 1,547 (1,228)
Eliminations/Corporate
        
Segment Reporting Information [Line Items]        
Net sales (951) (1,964) (1,865) (4,177)
Transfers between segments 951 1,918 1,857 4,095
Net sales to unaffiliated customers 0 (46) (8) (82)
Income (loss) from operations (3,841) (4,903) (8,465) (9,245)
Interest (income)/expense, net 227 90 418 143
Other (income)/expense, net (40) (254) (40) (730)
Income/(loss) before income taxes $ (4,028) $ (4,739) $ (8,843) $ (8,658)