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Restructuring - Severance and Retention Cost by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 705	$ 2,889	$ 1,835	$ 4,789
Research Models and Services
Restructuring Cost and Reserve [Line Items]
Severance charges	80	2,011	999	3,595
Discovery and Safety Assessment
Restructuring Cost and Reserve [Line Items]
Severance charges	456	854	475	1,049
Manufacturing Support
Restructuring Cost and Reserve [Line Items]
Severance charges	118	24	295	24
Corporate
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 51	$ 0	$ 66	$ 121

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

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.

+ References

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