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GOODWILL AND INTANGIBLE ASSETS - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Other intangible assets
Gross	$ 1,308,607	$ 1,112,348
Accumulated Amortization	(505,829)	(422,935)
Net	802,778	689,413
Backlog
Other intangible assets
Gross	28,875	28,865
Accumulated Amortization	(28,382)	(26,895)
Net	493	1,970
Technology
Other intangible assets
Gross	127,288	122,106
Accumulated Amortization	(74,045)	(57,737)
Net	53,243	64,369
Trademarks and trade names
Other intangible assets
Gross	15,622	8,430
Accumulated Amortization	(5,374)	(4,901)
Net	10,248	3,529
Other
Other intangible assets
Gross	20,600	18,279
Accumulated Amortization	(14,214)	(12,307)
Net	6,386	5,972
Other intangible assets
Other intangible assets
Gross	192,385	177,680
Accumulated Amortization	(122,015)	(101,840)
Net	70,370	75,840
Client relationships
Other intangible assets
Gross	1,116,222	934,668
Accumulated Amortization	(383,814)	(321,095)
Net	$ 732,408	$ 613,573

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