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Restructuring - Severance and Retention Cost by Reportable Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 1,130us-gaap_SeveranceCosts1	$ 1,900us-gaap_SeveranceCosts1
Research Models and Services
Restructuring Cost and Reserve [Line Items]
Severance charges	919	1,584
Discovery and Safety Assessment
Restructuring Cost and Reserve [Line Items]
Severance charges	19	195
Manufacturing Support
Restructuring Cost and Reserve [Line Items]
Severance charges	177	0
Corporate
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 15	$ 121

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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