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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 |  |  |  |  |  |  |  |  |  | 433,995 | 340,463 | 277,379
Gross profit : |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  | 104,739 | 111,698 | 90,291 | 68,318 | 66,621 | 100,040 | 69,647 | 50,421 | 375,046 | 286,729 | 259,092
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | 276,792 | 234,190 | 221,841
Income from operations: |  |  |  |  |  |  |  |  |  |  |  |
Income from operations |  | $ 36,904 | $ 11,464 | $ 32,605 | $ 17,281 | $ 3,913 | $ 38,622 | $ 11,709 | $ (1,705) | 98,254 | 52,539 | 37,251
Restructuring expenses | [1] |  |  |  |  |  |  |  |  | 3,311 | 8,644 |
Capital Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue: |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 651,934 | 488,925 | 411,099
Income from operations: |  |  |  |  |  |  |  |  |  |  |  |
Income from operations | [2] |  |  |  |  |  |  |  |  | 92,286 | 32,070 | 11,114
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 2, 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 2, of $0.9 million, $2.4 million and $0.4 million for the years ended 2017, 2016 and 2015 respectively

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