Goodwill and Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Other intangible assets
Gross	$ 661,160	$ 655,971
Accumulated Amortization	(290,864)	(286,209)
Net	370,296	369,762
Backlog
Other intangible assets
Gross	0	8,111
Accumulated Amortization	0	(8,111)
Net	0	0
Technology
Other intangible assets
Gross	83,428	81,309
Accumulated Amortization	(30,893)	(27,157)
Net	52,535	54,152
Trademarks and trade names
Other intangible assets
Gross	8,873	8,661
Accumulated Amortization	(4,609)	(4,562)
Net	4,264	4,099
Other
Other intangible assets
Gross	17,533	17,465
Accumulated Amortization	(8,456)	(7,845)
Net	9,077	9,620
Other intangible assets
Other intangible assets
Gross	109,834	115,546
Accumulated Amortization	(43,958)	(47,675)
Net	65,876	67,871
Client relationships
Other intangible assets
Gross	551,326	540,425
Accumulated Amortization	(246,906)	(238,534)
Net	$ 304,420	$ 301,891