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ACQUISITIONS AND DIVESTITURE (Aon Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Jan. 04, 2016	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017	Jan. 01, 2017
Business Acquisition [Line Items]
Cash purchase price, net of working capital adjustment										$ 22,742	$ 0		$ 72,476
Acquisition-Related and integration costs associated with a business combination										2,672	0		6,654
Revenue from services		$ 650,147	$ 680,371	$ 614,301	$ 554,388	$ 669,625	$ 660,780	$ 610,122	$ 568,244	$ 2,499,207	$ 2,508,771		$ 2,750,640
Aon Hewitt
Business Acquisition [Line Items]
Cash purchase price, net of working capital adjustment	$ 72,476
Acquisition-Related and integration costs associated with a business combination												$ 6,600
Revenue from services												$ 66,500
Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility
Business Acquisition [Line Items]
Line of credit facility, increase (decrease), Net	$ 30,000

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include acquisition-related costs, business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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