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Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 26, 2015 USD ($)
Changes in gross carrying amount and accumulated amortization of goodwill
Gross carrying amount, balance at the beginning of the period	$ 321,077
Adjustments to Goodwill, Acquisitions	104,224
Adjustments to Goodwill, Foreign Exchange	(7,056)
Gross carrying amount, balance at the end of the period	418,245
Research Models and Services
Changes in gross carrying amount and accumulated amortization of goodwill
Gross carrying amount, balance at the beginning of the period	59,196
Adjustments to Goodwill, Acquisitions	0
Adjustments to Goodwill, Foreign Exchange	(698)
Gross carrying amount, balance at the end of the period	58,498
Discovery and Safety Assessment
Changes in gross carrying amount and accumulated amortization of goodwill
Gross carrying amount, balance at the beginning of the period	229,302
Adjustments to Goodwill, Acquisitions	(748)
Adjustments to Goodwill, Foreign Exchange	(3,470)
Gross carrying amount, balance at the end of the period	225,084
Manufacturing Support
Changes in gross carrying amount and accumulated amortization of goodwill
Gross carrying amount, balance at the beginning of the period	32,579
Adjustments to Goodwill, Acquisitions	104,972
Adjustments to Goodwill, Foreign Exchange	(2,888)
Gross carrying amount, balance at the end of the period	$ 134,663

X

- Definition

The increase or decrease to the recorded value of goodwill due to foreign currency translation adjustments and other increases and decreases that are not separately disclosed.

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (a,h)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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