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Business Acquisitions and Divestiture - WIL Research Additional Information (Details) - WIL Research - USD ($) $ in Thousands		3 Months Ended
	Apr. 04, 2016	Apr. 01, 2017	Mar. 26, 2016	Feb. 11, 2017	Feb. 10, 2017
Business Acquisition [Line Items]
Purchase price	$ 604,800
Assumed liabilities	400
Purchase price allocation	577,391
Cash acquired	$ 27,400
Goodwill, expected tax deductible amount				$ 14,800	$ 19,000
Integration related costs and transaction costs		$ 500	$ 4,000

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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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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
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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.

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Amount of liabilities assumed at the acquisition date.

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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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