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Business Acquisitions - Chan Test Preliminary Purchase Price (Details) - USD ($) $ in Thousands		6 Months Ended
	Oct. 29, 2014	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2014
Business Acquisition [Line Items]
Goodwill		$ 317,414		$ 321,077
Total purchase price allocation		$ 10,680	$ 183,151
ChanTest
Business Acquisition [Line Items]
Current assets (excluding cash)	$ 4,648
Property, plant and equipment	1,579
Definite-lived intangible assets	23,920
Goodwill	34,927
Current liabilities	(3,515)
Long-term liabilities	(9,486)
Total purchase price allocation	$ 52,073

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