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Business Acquisitions- Oncotest Additional Information (Details) - Oncotest $ in Thousands, € in Millions		3 Months Ended	9 Months Ended
	Nov. 18, 2015 USD ($)	Sep. 26, 2015 USD ($)	Sep. 26, 2015 USD ($)	Sep. 24, 2016 EUR (€)	Sep. 24, 2016 USD ($)
Business Acquisition [Line Items]
Integration related costs and transaction costs		$ 900	$ 900
Purchase price	$ 36,000
Contingent consideration	300
Maximum contingent consideration				€ 2.0	$ 2,200
Total purchase price allocation	35,431
Cash acquired	$ 600

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Business Combination, Integration Related Costs and Transaction Costs

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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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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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