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GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 27, 2021 | Dec. 26, 2020
--- | --- | ---
Other intangible assets |  |
Gross | $ 1,327,743 | $ 1,334,244
Accumulated Amortization | (532,178) | (546,645)
Net | 795,565 | 787,599
Backlog |  |
Other intangible assets |  |
Gross | 610 | 29,233
Accumulated Amortization | (152) | (29,233)
Net | 458 | 0
Technology |  |
Other intangible assets |  |
Gross | 133,667 | 130,907
Accumulated Amortization | (85,610) | (81,305)
Net | 48,057 | 49,602
Trademarks and trade names |  |
Other intangible assets |  |
Gross | 12,231 | 15,870
Accumulated Amortization | (2,112) | (5,648)
Net | 10,119 | 10,222
Other |  |
Other intangible assets |  |
Gross | 28,736 | 20,903
Accumulated Amortization | (4,189) | (14,633)
Net | 24,547 | 6,270
Other intangible assets |  |
Other intangible assets |  |
Gross | 175,244 | 196,913
Accumulated Amortization | (92,063) | (130,819)
Net | 83,181 | 66,094
Client relationships |  |
Other intangible assets |  |
Gross | 1,152,499 | 1,137,331
Accumulated Amortization | (440,115) | (415,826)
Net | $ 712,384 | $ 721,505

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