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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 29, 2014 Segment | Mar. 30, 2013
Segment Reporting Information [Line Items] |  |
Number of reportable segments | 5 |
Product Sales | $ 601,040 | $ 552,274
Royalty Revenues | 1,338 | 1,980
Total Revenue | 602,378 | 554,254
Gross Margin | 145,283 | 136,734
Segment Operating Income | 42,572 | 45,605
Operating Income (Loss) | 42,572 | 45,605
Restructuring and severance Costs | (6,404) | 0
MOSFETS Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 113,113 | 100,846
Royalty Revenues | 28 | 42
Total Revenue | 113,141 | 100,888
Gross Margin | 12,617 | 12,900
Operating Income (Loss) | 2,487 | 2,833
Diodes Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 136,929 | 125,112
Royalty Revenues | 0 | 0
Total Revenue | 136,929 | 125,112
Gross Margin | 29,765 | 27,261
Operating Income (Loss) | 23,058 | 21,389
Optoelectronic Components Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 57,498 | 56,226
Royalty Revenues | 0 | 0
Total Revenue | 57,498 | 56,226
Gross Margin | 21,237 | 19,774
Operating Income (Loss) | 17,404 | 16,209
Resistors And Inductors Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 187,989 | 163,928
Royalty Revenues | 1,310 | 1,938
Total Revenue | 189,299 | 165,866
Gross Margin | 60,120 | 52,601
Operating Income (Loss) | 50,336 | 44,200
Capacitors Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 105,511 | 106,162
Royalty Revenues | 0 | 0
Total Revenue | 105,511 | 106,162
Gross Margin | 21,544 | 24,198
Operating Income (Loss) | 15,341 | 18,456
Unallocated Amount to Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating Income (Loss) | $ (59,650) | $ (57,482)

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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