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ACQUISITION AND DIVESTITURE - Narrative (Details) - USD ($) $ in Thousands			2 Months Ended	3 Months Ended								7 Months Ended	12 Months Ended
	Jun. 12, 2018	Mar. 12, 2018	Mar. 12, 2018	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 30, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Acquisition/integration costs													$ 1,562	$ 2,672	$ 0
Revenue from services				$ 591,040	$ 636,793	$ 588,594	$ 552,352	$ 650,147	$ 680,371	$ 614,301	$ 554,388		2,368,779	2,499,207	2,508,771
Divestiture of business													215	10,587	0
Divestiture non-cash consideration													0	798	$ 0
TMP
Business Acquisition [Line Items]
Cash purchase price, net of cash acquired	$ 22,742
Cash acquired from acquisition	$ 7,000
Acquisition/integration costs													1,600	2,700
Revenue from services												$ 31,000	$ 51,300
PlaneTechs [Member]
Business Acquisition [Line Items]
Revenue from services			$ 8,000
Divestiture of business		$ 11,400
Divestiture, amount of consideration received		8,500
Divestiture non-cash consideration		$ 1,600
Debt instrument, periodic payment														100
Gain on Disposition of Assets														$ 700

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- Definition

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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