GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 28, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Rollforward of Goodwill

The following table provides a rollforward of the Company’s goodwill:

				Adjustments to Goodwill								Adjustments to Goodwill
	December 30, 2017			Acquisitions		Foreign Exchange			December 29, 2018			Acquisitions		Foreign Exchange			December 28, 2019
	(in thousands)
RMS	$	58,122		$	—	$	(1,154	)	$	56,968		$	—	$	(382	)	$	56,586
DSA	1,610,176			460,223		(13,929		)	2,056,470			293,380		373			2,350,223
Manufacturing	141,608			2,551		(5,464		)	138,695			—		61			138,756
Gross carrying amount	1,809,906			462,774		(20,547		)	2,252,133			293,380		52			2,545,565
Accumulated impairment loss - DSA	(1,005,000		)	—		—			(1,005,000		)	—		—			(1,005,000		)
Goodwill	$	804,906							$	1,247,133							$	1,540,565

Schedule of Intangible Assets, Net by Class

The following table displays intangible assets, net by major class:

	December 28, 2019							December 29, 2018
	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
	(in thousands)
Backlog	$	28,865	$	(26,895	)	$	1,970	$	20,900	$	(18,691	)	$	2,209
Technology	122,106		(57,737		)	64,369		101,506		(41,870		)	59,636
Trademarks and trade names	8,430		(4,901		)	3,529		8,331		(4,640		)	3,691
Other	18,279		(12,307		)	5,972		17,448		(10,041		)	7,407
Other intangible assets	177,680		(101,840		)	75,840		148,185		(75,242		)	72,943
Client relationships	934,668		(321,095		)	613,573		791,725		(253,780		)	537,945
Intangible assets	$	1,112,348	$	(422,935	)	$	689,413	$	939,910	$	(329,022	)	$	610,888

Schedule of Estimated Amortization Expense

As of December 28, 2019, estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows:

Fiscal Year	Amortization Expense
	(in thousands)
2020	$	97,024
2021	87,540
2022	76,204
2023	67,807
2024	60,918