GOODWILL AND INTANGIBLE ASSETS - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Other intangible assets
Gross	$ 945,834	$ 939,910
Accumulated Amortization	(351,075)	(329,022)
Net	594,759	610,888
Backlog
Other intangible assets
Gross	20,900	20,900
Accumulated Amortization	(19,238)	(18,691)
Net	1,662	2,209
Technology
Other intangible assets
Gross	102,038	101,506
Accumulated Amortization	(44,682)	(41,870)
Net	57,356	59,636
Trademarks and trade names
Other intangible assets
Gross	8,411	8,331
Accumulated Amortization	(4,692)	(4,640)
Net	3,719	3,691
Other
Other intangible assets
Gross	17,471	17,448
Accumulated Amortization	(10,557)	(10,041)
Net	6,914	7,407
Other intangible assets
Other intangible assets
Gross	148,820	148,185
Accumulated Amortization	(79,169)	(75,242)
Net	69,651	72,943
Client relationships
Other intangible assets
Gross	797,014	791,725
Accumulated Amortization	(271,906)	(253,780)
Net	$ 525,108	$ 537,945