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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets, Net by Major Class (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 26, 2015
--- | --- | ---
Finite-lived intangible assets |  |
Gross | $ 623,870 | $ 533,661
Accumulated Amortization | (229,422) | (252,857)
Net | 394,448 | 280,804
Backlog |  |
Finite-lived intangible assets |  |
Gross | 8,370 | 50,568
Accumulated Amortization | (6,390) | (50,554)
Net | 1,980 | 14
Technology |  |
Finite-lived intangible assets |  |
Gross | 71,425 | 60,350
Accumulated Amortization | (14,314) | (5,911)
Net | 57,111 | 54,439
Trademark and trade names |  |
Finite-lived intangible assets |  |
Gross | 8,177 | 11,495
Accumulated Amortization | (4,124) | (5,944)
Net | 4,053 | 5,551
Other |  |
Finite-lived intangible assets |  |
Gross | 16,775 | 14,711
Accumulated Amortization | (5,628) | (7,285)
Net | 11,147 | 7,426
Other intangible assets |  |
Finite-lived intangible assets |  |
Gross | 104,747 | 137,124
Accumulated Amortization | (30,456) | (69,694)
Net | 74,291 | 67,430
Client relationships |  |
Finite-lived intangible assets |  |
Gross | 519,123 | 396,537
Accumulated Amortization | (198,966) | (183,163)
Net | $ 320,157 | $ 213,374

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