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SEGMENT INFORMATION (Operating information by segment) (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 revenue: |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  | $ 184,824 | $ 268,834 | $ 221,772 | $ 213,691 | $ 215,892 | $ 243,897 | $ 199,613 | $ 149,639 | $ 889,121 | $ 809,041 | $ 627,192
Cost of sales : |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | 479,680 | 426,947 | 346,156
Gross profit : |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  | 85,823 | 126,969 | 99,447 | 97,202 | 107,401 | 114,003 | 92,263 | 68,427 | 409,441 | 382,094 | 281,036
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | 242,809 | 269,011 | 227,083
Income from operations: |  |  |  |  |  |  |  |  |  |  |  |
Income from operations |  | $ 24,574 | $ 64,463 | $ 38,436 | $ 39,159 | $ 41,849 | $ 15,672 | $ 36,503 | $ 19,059 | 166,632 | 113,083 | 53,953
Restructuring expenses | [1] |  |  |  |  |  |  |  |  | (321) | 3,311 | 8,644
Capital Equipment |  |  |  |  |  |  |  |  |  |  |  |
Net revenue: |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 719,390 | 651,934 | 488,925
Income from operations: |  |  |  |  |  |  |  |  |  |  |  |
Income from operations | [2] |  |  |  |  |  |  |  |  | 132,563 | 107,115 | 33,484
Restructuring expenses |  |  |  |  |  |  |  |  |  |  | 2,400 | 6,200
APS [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue: |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 169,731 | 157,107 | 138,267
Income from operations: |  |  |  |  |  |  |  |  |  |  |  |
Income from operations | [3] |  |  |  |  |  |  |  |  | $ 34,069 | 5,968 | 20,469
Restructuring expenses |  |  |  |  |  |  |  |  |  |  | $ 900 | $ 2,400
[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 and $6.2 million for the years ended 2017 and 2016 respectively.
[3] | Includes the restructuring expenses as discussed in Note 2, of $0.9 million and $2.4 million for the years ended 2017 and 2016 respectively

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