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GOODWILL AND INTANGIBLE ASSETS (Tables)
12 Months Ended
Dec. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Rollforward of Goodwill
The following table provides a rollforward of the Company’s goodwill:
Adjustments to GoodwillAdjustments to Goodwill
December 29, 2018AcquisitionsForeign ExchangeDecember 28, 2019AcquisitionsForeign ExchangeDecember 26, 2020
(in thousands)
RMS$56,968 $— $(382)$56,586 $229,654 $1,519 $287,759 
DSA2,056,470 293,380 373 2,350,223 (629)33,536 2,383,130 
Manufacturing138,695 — 61 138,756 — 4,523 143,279 
Gross carrying amount2,252,133 293,380 52 2,545,565 229,025 39,578 2,814,168 
Accumulated impairment loss - DSA(1,005,000)— — (1,005,000)— — (1,005,000)
Goodwill$1,247,133 $1,540,565 $1,809,168 
Schedule of Intangible Assets, Net by Class
The following table displays intangible assets, net by major class:
 December 26, 2020December 28, 2019
GrossAccumulated
Amortization
NetGrossAccumulated
Amortization
Net
(in thousands)
Backlog$29,233 $(29,233)$— $28,865 $(26,895)$1,970 
Technology130,907 (81,305)49,602 122,106 (57,737)64,369 
Trademarks and trade names15,870 (5,648)10,222 8,430 (4,901)3,529 
Other20,903 (14,633)6,270 18,279 (12,307)5,972 
Other intangible assets196,913 (130,819)66,094 177,680 (101,840)75,840 
Client relationships1,137,331 (415,826)721,505 934,668 (321,095)613,573 
Intangible assets$1,334,244 $(546,645)$787,599 $1,112,348 $(422,935)$689,413 
Schedule of Estimated Amortization Expense As of December 26, 2020, estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows:
Fiscal YearAmortization Expense
(in thousands)
2021$104,272 
202291,877 
202383,651 
202476,291 
202571,915