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BUSINESS ACQUISITIONS AND DIVESTITURE - Pro Forma Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
MPI Research
Business Acquisition [Line Items]
Revenue	$ 2,328,213	$ 2,095,385
Net income attributable to common shareholders	$ 225,550	$ 126,641
WIL Research
Business Acquisition [Line Items]
Revenue			$ 1,741,964
Net income attributable to common shareholders			$ 175,779

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
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