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v3.10.0.1

Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Sep. 29, 2018 USD ($) Segment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  | 5 |  |  |
Product Sales | $ 780,939 |  | $ 677,933 |  |  | $ 2,258,691 | $ 1,925,856 |  |
Royalty Revenues | 33 |  | 8 |  |  | 106 | 50 |  |
Total Revenue | 780,972 | $ 673,462 | 677,941 | $ 643,164 | $ 604,801 | 2,258,797 | 1,925,906 | $ 2,599,368 | $ 2,317,328
Gross Margin | 236,296 | 177,376 | 190,147 | 173,837 | 161,749 | 668,834 | 525,733 | 703,109 | 573,822
Segment Operating Income | 203,904 |  | 160,375 |  |  | 569,822 | 435,014 |  |
Restructuring and severance Costs | 0 |  | (3,244) |  |  | 0 | (5,194) |  |
Operating income | 138,098 | 76,006 | 95,416 | 85,005 | 67,578 | 365,453 | 247,999 | 324,005 | 197,058
Unallocated Other Income (Expense) | (11,290) | (8,981) | (9,228) | (9,296) | (17,136) | (49,067) | (35,660) | (44,641) | (102,842)
Income before taxes | 126,808 | $ 67,025 | 86,188 | $ 75,709 | $ 50,442 | 316,386 | 212,339 | 279,364 | 94,216
Distributors [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 452,051 |  | 383,727 |  |  | 1,302,127 | 1,102,232 | 1,484,276 | 1,280,060
OEMs [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 276,299 |  | 247,551 |  |  | 803,128 | 685,565 | 931,291 | 861,322
EMS companies [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 52,622 |  | 46,663 |  |  | 153,542 | 138,109 | 183,801 | 175,946
Industrial [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 283,134 |  | 242,038 |  |  | 858,963 | 691,678 | 934,631 | 796,031
Automotive [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 224,041 |  | 185,781 |  |  | 642,293 | 537,008 | 727,220 | 640,767
Telecommunications [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 51,935 |  | 50,710 |  |  | 144,326 | 143,828 | 190,682 | 193,456
Computing [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 62,774 |  | 55,380 |  |  | 163,862 | 143,948 | 198,850 | 172,481
Consumer Products [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 48,583 |  | 40,155 |  |  | 126,781 | 108,711 | 145,243 | 150,741
Power Supplies [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 34,899 |  | 44,327 |  |  | 110,468 | 120,223 | 160,038 | 132,555
Military and Aerospace [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 41,881 |  | 33,029 |  |  | 117,355 | 98,753 | 132,898 | 128,523
Medical [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 33,725 |  | 26,521 |  |  | 94,749 | 81,757 | 109,806 | 102,774
Asia [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 315,701 |  | 282,416 |  |  | 904,047 | 811,987 | 1,091,107 | 948,195
Americas [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 195,753 |  | 157,651 |  |  | 545,249 | 448,870 | 605,904 | 558,590
Europe [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Revenue | 269,518 |  | 237,874 |  |  | 809,501 | 665,049 | $ 902,357 | $ 810,543
MOSFETS Segment [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Product Sales | 144,227 |  | 126,522 |  |  | 408,280 | 345,399 |  |
Royalty Revenues | 33 |  | 0 |  |  | 45 | 0 |  |
Total Revenue | 144,260 |  | 126,522 |  |  | 408,325 | 345,399 |  |
Gross Margin | 38,991 |  | 32,349 |  |  | 109,440 | 78,423 |  |
Segment Operating Income | 29,502 |  | 23,434 |  |  | 80,577 | 51,917 |  |
Diodes Segment [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Product Sales | 186,492 |  | 160,562 |  |  | 535,975 | 460,492 |  |
Royalty Revenues | 0 |  | 0 |  |  | 0 | 0 |  |
Total Revenue | 186,492 |  | 160,562 |  |  | 535,975 | 460,492 |  |
Gross Margin | 54,690 |  | 43,575 |  |  | 150,298 | 123,499 |  |
Segment Operating Income | 49,561 |  | 38,694 |  |  | 134,592 | 109,014 |  |
Optoelectronic Components Segment [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Product Sales | 76,443 |  | 77,145 |  |  | 224,110 | 215,040 |  |
Royalty Revenues | 0 |  | 0 |  |  | 0 | 0 |  |
Total Revenue | 76,443 |  | 77,145 |  |  | 224,110 | 215,040 |  |
Gross Margin | 27,653 |  | 29,042 |  |  | 81,290 | 77,091 |  |
Segment Operating Income | 23,144 |  | 25,214 |  |  | 68,103 | 64,007 |  |
Resistors And Inductors Segment [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Product Sales | 257,330 |  | 217,489 |  |  | 755,262 | 626,684 |  |
Royalty Revenues | 0 |  | 8 |  |  | 61 | 50 |  |
Total Revenue | 257,330 |  | 217,497 |  |  | 755,323 | 626,734 |  |
Gross Margin | 88,213 |  | 65,586 |  |  | 251,712 | 188,936 |  |
Segment Operating Income | 80,042 |  | 58,328 |  |  | 226,292 | 167,035 |  |
Capacitors Segment [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Product Sales | 116,447 |  | 96,215 |  |  | 335,064 | 278,241 |  |
Royalty Revenues | 0 |  | 0 |  |  | 0 | 0 |  |
Total Revenue | 116,447 |  | 96,215 |  |  | 335,064 | 278,241 |  |
Gross Margin | 26,749 |  | 19,595 |  |  | 76,094 | 57,784 |  |
Segment Operating Income | 21,655 |  | 14,705 |  |  | 60,258 | 43,041 |  |
Unallocated Amount to Segment [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment Operating Income | (65,806) |  | (61,715) |  |  | (204,369) | (181,821) |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment Operating Income | 203,904 |  | 160,375 |  |  | 569,822 | 435,014 |  |
Unallocated Amount to Segment [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Restructuring and severance Costs | 0 |  | (3,244) |  |  | 0 | (5,194) |  |
Unallocated Other Income (Expense) | $ (11,290) |  | $ (9,228) |  |  | $ (49,067) | $ (35,660) |  |

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