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SEGMENT INFORMATION (Operating information by segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Sep. 30, 2017 | Oct. 01, 2016 | Oct. 03, 2015
Net revenue: |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  | $ 215,892 | $ 243,897 | $ 199,613 | $ 149,639 | $ 145,844 | $ 216,414 | $ 156,400 | $ 108,534 | $ 809,041 | $ 627,192 | $ 536,471
Cost of sales : |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | 426,947 | 346,156 | 284,524
Gross profit : |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  | 107,400 | 114,004 | 92,263 | 68,427 | 65,240 | 99,556 | 67,745 | 48,495 | 382,094 | 281,036 | 251,947
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | 269,011 | 227,083 | 213,356
Income from operations: |  |  |  |  |  |  |  |  |  |  |  |
Income from operations |  | $ 41,849 | $ 15,672 | $ 36,503 | $ 19,059 | $ 4,430 | $ 39,862 | $ 11,661 | $ (2,000) | 113,083 | 53,953 | 38,591
Restructuring expenses | [1] |  |  |  |  |  |  |  |  | 3,311 | 8,644 |
Capital Equipment |  |  |  |  |  |  |  |  |  |  |  |
Net revenue: |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 651,934 | 488,925 | 411,099
Income from operations: |  |  |  |  |  |  |  |  |  |  |  |
Income from operations | [2] |  |  |  |  |  |  |  |  | 107,115 | 33,484 | 12,454
Restructuring expenses |  |  |  |  |  |  |  |  |  | 2,400 | 6,000 | 1,500
APS [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue: |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 157,107 | 138,267 | 125,372
Income from operations: |  |  |  |  |  |  |  |  |  |  |  |
Income from operations | [3] |  |  |  |  |  |  |  |  | 5,968 | 20,469 | 26,137
Restructuring expenses |  |  |  |  |  |  |  |  |  | $ 900 | $ 2,400 | $ 400
[1] | Provision for severance and benefits and other exit costs are included within selling, general and administrative expenses on the Consolidated Statements of Operations.
[2] | Includes the restructuring expenses as discussed in Note 3, of $2.4 million, $6.2 million and $1.5 million for the years ended 2017, 2016 and 2015 respectively.
[3] | Includes the restructuring expenses as discussed in Note 3, of $0.9 million, $2.4 million and $0.4 million for the years ended 2017, 2016 and 2015 respectively

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