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Business Acquisitions and Divestiture - Agilux Additional Information (Details) - Agilux Laboratories - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 28, 2016	Sep. 30, 2017	Sep. 24, 2016	Sep. 30, 2017	Sep. 24, 2016
Business Acquisition [Line Items]
Purchase price	$ 64,900
Purchase price allocation	62,025
Cash acquired	$ 2,900
Integration related costs and transaction costs		$ 0	$ 1,100	$ 300	$ 1,100

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- Definition

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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- Definition

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
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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-Section 50
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-Section 30
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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 12
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