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GOODWILL AND INTANGIBLE ASSETS - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 28, 2019 | Dec. 29, 2018
--- | --- | ---
Other intangible assets |  |
Gross | $ 1,093,592 | $ 939,910
Accumulated Amortization | (391,467) | (329,022)
Net | 702,125 | 610,888
Backlog |  |
Other intangible assets |  |
Gross | 28,716 | 20,900
Accumulated Amortization | (23,969) | (18,691)
Net | 4,747 | 2,209
Technology |  |
Other intangible assets |  |
Gross | 119,180 | 101,506
Accumulated Amortization | (52,291) | (41,870)
Net | 66,889 | 59,636
Trademarks and trade names |  |
Other intangible assets |  |
Gross | 8,108 | 8,331
Accumulated Amortization | (4,724) | (4,640)
Net | 3,384 | 3,691
Other |  |
Other intangible assets |  |
Gross | 17,850 | 17,448
Accumulated Amortization | (11,613) | (10,041)
Net | 6,237 | 7,407
Other intangible assets |  |
Other intangible assets |  |
Gross | 173,854 | 148,185
Accumulated Amortization | (92,597) | (75,242)
Net | 81,257 | 72,943
Client relationships |  |
Other intangible assets |  |
Gross | 919,738 | 791,725
Accumulated Amortization | (298,870) | (253,780)
Net | $ 620,868 | $ 537,945

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