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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 28, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in the Gross Carrying Amount and Accumulated Amortization of Goodwill
The following table provides a rollforward of the Company’s goodwill:
 
 
 
Adjustments to Goodwill
 
 
 
December 27, 2014
 
Acquisitions
 
Foreign Exchange
 
March 28, 2015
 
(in thousands)
Research Models and Services
$
59,196

 
$
—

 
$
(411
)
 
$
58,785

Discovery and Safety Assessment
229,302

 
(624
)
 
(5,547
)
 
223,131

Manufacturing Support
32,579

 
187

 
(1,523
)
 
31,243

Total
$
321,077

 
$
(437
)
 
$
(7,481
)
 
$
313,159
Schedule of Finite-Lived Intangible Assets
The following table displays other intangible assets, net by major class:
 
March 28, 2015
 
December 27, 2014
 
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
 
(in thousands)
Backlog
$
8,574

 
$
(8,027
)
 
$
547

 
$
8,728

 
$
(6,636
)
 
$
2,092

Client relationships
361,287

 
(208,866
)
 
152,421

 
379,339

 
(217,938
)
 
161,401

Trademarks and trade names
6,533

 
(5,396
)
 
1,137

 
6,603

 
(5,314
)
 
1,289

Standard operating procedures
2,302

 
(1,738
)
 
564

 
2,309

 
(1,642
)
 
667

Other identifiable intangible assets
16,061

 
(4,926
)
 
11,135

 
16,334

 
(6,346
)
 
9,988

Total definite-lived intangible assets
394,757

 
(228,953
)
 
165,804

 
413,313

 
(237,876
)
 
175,437

Indefinite-lived intangibles assets
 
 
 
 
3,438

 
 
 
 
 
3,438

Total other intangibles assets, net
 
 
 
 
$
169,242

 
 
 
 
 
$
178,875