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Segment Information (Details) $ in Thousands | 3 Months Ended
--- | ---
Apr. 02, 2016 USD ($) Segment | Apr. 04, 2015 USD ($)
Segment Reporting Information [Line Items] |  |
Number of reportable segments | Segment | 5 |
Product Sales | $ 570,528 | $ 592,323
Royalty Revenues | 78 | 1,113
Total Revenue | 570,606 | 593,436
Gross Margin | 137,309 | 145,038
Segment Operating Income | 40,548 | 47,558
Restructuring and severance Costs | (6,475) | (1,410)
MOSFETS Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 100,933 | 106,759
Royalty Revenues | 0 | 11
Total Revenue | 100,933 | 106,770
Gross Margin | 12,587 | 13,758
Diodes Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 135,384 | 136,511
Royalty Revenues | 0 | 0
Total Revenue | 135,384 | 136,511
Gross Margin | 32,662 | 29,890
Optoelectronic Components Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 62,775 | 68,625
Royalty Revenues | 0 | 0
Total Revenue | 62,775 | 68,625
Gross Margin | 19,181 | 22,183
Resistors And Inductors Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 183,416 | 186,392
Royalty Revenues | 78 | 1,102
Total Revenue | 183,494 | 187,494
Gross Margin | 55,784 | 58,849
Capacitors Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 88,020 | 94,036
Royalty Revenues | 0 | 0
Total Revenue | 88,020 | 94,036
Gross Margin | 17,095 | 20,358
Unallocated Amount to Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment Operating Income | (54,078) | (60,220)
Operating Segments [Member] | MOSFETS Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment Operating Income | 2,618 | 4,527
Operating Segments [Member] | Diodes Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment Operating Income | 26,643 | 23,485
Operating Segments [Member] | Optoelectronic Components Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment Operating Income | 13,654 | 17,087
Operating Segments [Member] | Resistors And Inductors Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment Operating Income | 46,883 | 49,525
Operating Segments [Member] | Capacitors Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment Operating Income | 11,303 | 14,564
Unallocated Amount to Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Restructuring and severance Costs | $ (6,475) | $ (1,410)

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