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GOODWILL AND INTANGIBLE ASSETS - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Other intangible assets
Gross	$ 1,093,592	$ 939,910
Accumulated Amortization	(391,467)	(329,022)
Net	702,125	610,888
Backlog
Other intangible assets
Gross	28,716	20,900
Accumulated Amortization	(23,969)	(18,691)
Net	4,747	2,209
Technology
Other intangible assets
Gross	119,180	101,506
Accumulated Amortization	(52,291)	(41,870)
Net	66,889	59,636
Trademarks and trade names
Other intangible assets
Gross	8,108	8,331
Accumulated Amortization	(4,724)	(4,640)
Net	3,384	3,691
Other
Other intangible assets
Gross	17,850	17,448
Accumulated Amortization	(11,613)	(10,041)
Net	6,237	7,407
Other intangible assets
Other intangible assets
Gross	173,854	148,185
Accumulated Amortization	(92,597)	(75,242)
Net	81,257	72,943
Client relationships
Other intangible assets
Gross	919,738	791,725
Accumulated Amortization	(298,870)	(253,780)
Net	$ 620,868	$ 537,945

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