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ACQUISITIONS - Assets acquired and liabilities assumed (Details) - USD ($) $ in Thousands | Dec. 29, 2018 | Aug. 03, 2018 | Dec. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 385,207 |  | $ 337,720 | $ 321,110
Walpar, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets |  | $ 13,210 |  |
Patent and Proprietary Technology |  | 32,000 |  |
Trade name |  | 4,300 |  |
Goodwill |  | 42,216 |  |
Total fair value of assets acquired |  | 91,726 |  |
Current liabilities |  | 2,185 |  |
Deferred taxes |  | 8,654 |  |
Total fair value of liabilities assumed |  | 10,839 |  |
Non-controlling interests |  | 23,082 |  |
Net assets acquired |  | 57,805 |  |
Convert Italia SpA |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets |  | 18,349 |  |
Other assets |  | 3,166 |  |
Patent and Proprietary Technology |  | 16,554 |  |
Trade name |  | 8,701 |  |
Goodwill |  | 34,280 |  |
Total fair value of assets acquired |  | 81,050 |  |
Current liabilities |  | 5,376 |  |
Contingent consideration liability |  | 11,608 |  |
Deferred taxes |  | 6,061 |  |
Total fair value of liabilities assumed |  | 23,045 |  |
Non-controlling interests |  | 14,501 |  |
Net assets acquired |  | $ 43,504 |  |

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