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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets, Net by Major Class (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Dec. 28, 2019
--- | --- | ---
Finite-lived intangible assets |  |
Gross | $ 1,334,244 | $ 1,112,348
Accumulated Amortization | (546,645) | (422,935)
Net | 787,599 | 689,413
Backlog |  |
Finite-lived intangible assets |  |
Gross | 29,233 | 28,865
Accumulated Amortization | (29,233) | (26,895)
Net | 0 | 1,970
Technology |  |
Finite-lived intangible assets |  |
Gross | 130,907 | 122,106
Accumulated Amortization | (81,305) | (57,737)
Net | 49,602 | 64,369
Trademarks and trade names |  |
Finite-lived intangible assets |  |
Gross | 15,870 | 8,430
Accumulated Amortization | (5,648) | (4,901)
Net | 10,222 | 3,529
Other |  |
Finite-lived intangible assets |  |
Gross | 20,903 | 18,279
Accumulated Amortization | (14,633) | (12,307)
Net | 6,270 | 5,972
Other intangible assets |  |
Finite-lived intangible assets |  |
Gross | 196,913 | 177,680
Accumulated Amortization | (130,819) | (101,840)
Net | 66,094 | 75,840
Client relationships |  |
Finite-lived intangible assets |  |
Gross | 1,137,331 | 934,668
Accumulated Amortization | (415,826) | (321,095)
Net | $ 721,505 | $ 613,573

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