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Segment Information and Geographic Area Information - Information about Reportable Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 27, 2013
Jan. 26, 2013
Oct. 27, 2012
Jul. 28, 2012
Apr. 28, 2012
Jan. 28, 2012
Oct. 29, 2011
Jul. 30, 2011
Apr. 27, 2013
segment
Apr. 28, 2012
Apr. 30, 2011
Segment Reporting Information [Line Items]                      
Number of reportable segments                 4    
Net sales                 $ 519,836 $ 465,095 $ 428,215
Transfers between segments                 0 0 0
Net sales to unaffiliated customers 148,359 122,982 129,758 118,737 126,401 112,000 115,890 110,804 519,836 465,095 428,215
Income/(loss) from operations                 39,178 11,357 15,944
Interest (income)/expense, net                 (30) (288) 198
Other (income)/expense, net                 1,257 272 1,284
Income before income taxes                 37,951 11,373 14,462
Depreciation and amortization                 18,806 16,159 15,756
Identifiable assets 434,939       403,648       434,939 403,648 334,744
Automotive
                      
Segment Reporting Information [Line Items]                      
Net sales                 311,028 274,681 228,362
Transfers between segments                 (893) (3,074) (2,315)
Net sales to unaffiliated customers                 310,135 271,607 226,047
Income/(loss) from operations                 38,789 10,045 13,325
Depreciation and amortization                 11,315 9,012 7,704
Identifiable assets 276,911       225,814       276,911 225,814 167,991
Interconnect
                      
Segment Reporting Information [Line Items]                      
Net sales                 142,619 130,572 139,877
Transfers between segments                 (2,393) (2,864) (1,096)
Net sales to unaffiliated customers                 140,226 127,708 138,781
Income/(loss) from operations                 18,993 18,127 19,989
Depreciation and amortization                 2,971 3,011 3,579
Identifiable assets 138,044       135,549       138,044 135,549 122,687
Power Products
                      
Segment Reporting Information [Line Items]                      
Net sales                 52,839 52,447 50,768
Transfers between segments                 (169) (434) (353)
Net sales to unaffiliated customers                 52,670 52,013 50,415
Income/(loss) from operations                 (2,111) 1,698 3,630
Depreciation and amortization                 2,442 2,281 2,283
Identifiable assets 30,752       36,490       30,752 36,490 42,330
All Other Segments
                      
Segment Reporting Information [Line Items]                      
Net sales                 16,787 14,036 13,052
Transfers between segments                 (136) (105) (71)
Net sales to unaffiliated customers                 16,651 13,931 12,981
Income/(loss) from operations                 3,502 (217) (2,032)
Depreciation and amortization                 906 784 698
Identifiable assets 5,157       5,827       5,157 5,827 8,726
Corporate And Intersegment Elimination
                      
Segment Reporting Information [Line Items]                      
Net sales                 (3,437) (6,641) (3,844)
Transfers between segments                 3,591 6,477 3,835
Net sales to unaffiliated customers                 154 (164) (9)
Income/(loss) from operations                 (19,995) (18,296) (18,968)
Depreciation and amortization                 1,172 1,071 1,492
Identifiable assets $ (15,925)       $ (32)       $ (15,925) $ (32) $ (6,990)