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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