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GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 25, 2021 | Dec. 26, 2020
--- | --- | ---
Other intangible assets |  |
Gross | $ 1,695,401 | $ 1,334,244
Accumulated Amortization | (595,521) | (546,645)
Net | 1,099,880 | 787,599
Backlog |  |
Other intangible assets |  |
Gross | 11,874 | 29,233
Accumulated Amortization | (8,019) | (29,233)
Net | 3,855 | 0
Technology |  |
Other intangible assets |  |
Gross | 137,753 | 130,907
Accumulated Amortization | (92,884) | (81,305)
Net | 44,869 | 49,602
Trademarks and trade names |  |
Other intangible assets |  |
Gross | 13,188 | 15,870
Accumulated Amortization | (3,074) | (5,648)
Net | 10,114 | 10,222
Other |  |
Other intangible assets |  |
Gross | 35,331 | 20,903
Accumulated Amortization | (6,895) | (14,633)
Net | 28,436 | 6,270
Other intangible assets |  |
Other intangible assets |  |
Gross | 198,146 | 196,913
Accumulated Amortization | (110,872) | (130,819)
Net | 87,274 | 66,094
Client relationships |  |
Other intangible assets |  |
Gross | 1,497,255 | 1,137,331
Accumulated Amortization | (484,649) | (415,826)
Net | $ 1,012,606 | $ 721,505

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