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BUSINESS COMBINATION - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Oct. 01, 2016 | Oct. 03, 2015
Assembléon [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenue |  |  | $ 562,754
Net income / (loss) |  |  | $ 45,303
Basic income per common share (in dollars per share) |  |  | $ 0.60
Diluted income per common share (in dollars per share) |  |  | $ 0.60
Liteq B.V. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenue | $ 809,041 | $ 627,192 |
Net income / (loss) | $ 105,966 | $ 41,186 |
Basic income per common share (in dollars per share) | $ 1.49 | $ 0.58 |
Diluted income per common share (in dollars per share) | $ 1.47 | $ 0.58 |

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