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Reportable Segments, Geographic Information and Major Customers - Net Sales and Long-Lived Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016
Net sales | $ 771,178 | $ 726,385 | $ 698,651 | $ 677,294 | $ 669,852 | $ 618,832 | $ 604,349 | $ 635,019 | $ 2,873,508 | $ 2,528,052 | $ 2,556,004
Long-lived assets | 341,306 |  |  |  | 314,665 |  |  |  | 341,306 | 314,665 |
Operating Segments | United States |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,000,680 | 984,773 | 1,134,342
Long-lived assets | 108,694 |  |  |  | 110,828 |  |  |  | 108,694 | 110,828 |
Operating Segments | Malaysia |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,118,032 | 940,045 | 844,501
Long-lived assets | 89,938 |  |  |  | 74,769 |  |  |  | 89,938 | 74,769 |
Operating Segments | China |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 379,977 | 339,216 | 317,350
Long-lived assets | 21,878 |  |  |  | 18,602 |  |  |  | 21,878 | 18,602 |
Operating Segments | Mexico |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 218,264 | 181,573 | 194,418
Long-lived assets | 43,078 |  |  |  | 37,237 |  |  |  | 43,078 | 37,237 |
Operating Segments | Romania |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 177,111 | 114,363 | 83,712
Long-lived assets | 34,316 |  |  |  | 33,717 |  |  |  | 34,316 | 33,717 |
Operating Segments | United Kingdom |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 91,426 | 70,163 | 81,894
Long-lived assets | 6,171 |  |  |  | 6,456 |  |  |  | 6,171 | 6,456 |
Operating Segments | Germany |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 12,953 | 8,303 | 4,844
Operating Segments | Other Foreign |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 5,646 |  |  |  | 5,429 |  |  |  | 5,646 | 5,429 |
Elimination of inter-segment sales |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (124,935) | (110,384) | $ (105,057)
Corporate |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 31,585 |  |  |  | $ 27,627 |  |  |  | $ 31,585 | $ 27,627 |

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