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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 30, 2013 | Mar. 31, 2012
Segment Reporting Information [Line Items] |  |
Number of reportable segments | 5 | 5
Product Sales | $ 552,274 | $ 536,627
Royalty Revenues | 1,980 | 1,920
Total Revenue | 554,254 | 538,547
Gross Margin | 136,734 | 136,709
Operating Income | 45,605 | 50,345
Operating Income (Loss) | 45,605 | 50,345
MOSFETS Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 100,846 | 94,701
Royalty Revenues | 42 | 137
Total Revenue | 100,888 | 94,838
Gross Margin | 12,900 | 10,617
Operating Income | 2,833 | 1,323
Diodes Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 125,112 | 120,134
Royalty Revenues | 0 | 0
Total Revenue | 125,112 | 120,134
Gross Margin | 27,261 | 25,054
Operating Income | 21,389 | 19,359
Optoelectronic Components Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 56,226 | 50,612
Royalty Revenues | 0 | 27
Total Revenue | 56,226 | 50,639
Gross Margin | 19,774 | 17,294
Operating Income | 16,209 | 14,045
Resistors And Inductors Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 163,928 | 157,254
Royalty Revenues | 1,938 | 1,756
Total Revenue | 165,866 | 159,010
Gross Margin | 52,601 | 54,259
Operating Income | 44,200 | 46,512
Capacitors Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 106,162 | 113,926
Royalty Revenues | 0 | 0
Total Revenue | 106,162 | 113,926
Gross Margin | 24,198 | 29,485
Operating Income | 18,456 | 23,917
Unallocated Amount to Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Product Sales | 0 | 0
Royalty Revenues | 0 | 0
Total Revenue | 0 | 0
Gross Margin | 0 | 0
Operating Income | $ (57,482) | $ (54,811)

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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=6880815&loc=d3e20235-122688 + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + 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) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition Revenue earned during the period from the leasing or otherwise lending to a third party the entity's rights or title to certain property. Royalty revenue is derived from a percentage or stated amount of sales proceeds or revenue generated by the third party using the entity's property. Examples of property from which royalties may be derived include patents and oil and mineral rights. + 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(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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