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GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 26, 2021 | Dec. 26, 2020
--- | --- | ---
Other intangible assets |  |
Gross | $ 1,626,200 | $ 1,334,244
Accumulated Amortization | (569,425) | (546,645)
Net | 1,056,775 | 787,599
Backlog |  |
Other intangible assets |  |
Gross | 9,844 | 29,233
Accumulated Amortization | (4,291) | (29,233)
Net | 5,553 | 0
Technology |  |
Other intangible assets |  |
Gross | 138,207 | 130,907
Accumulated Amortization | (89,911) | (81,305)
Net | 48,296 | 49,602
Trademarks and trade names |  |
Other intangible assets |  |
Gross | 13,568 | 15,870
Accumulated Amortization | (2,704) | (5,648)
Net | 10,864 | 10,222
Other |  |
Other intangible assets |  |
Gross | 33,327 | 20,903
Accumulated Amortization | (5,589) | (14,633)
Net | 27,738 | 6,270
Other intangible assets |  |
Other intangible assets |  |
Gross | 194,946 | 196,913
Accumulated Amortization | (102,495) | (130,819)
Net | 92,451 | 66,094
Client relationships |  |
Other intangible assets |  |
Gross | 1,431,254 | 1,137,331
Accumulated Amortization | (466,930) | (415,826)
Net | $ 964,324 | $ 721,505

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