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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