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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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