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ACQUISITION Acquisition (Details) - USD ($) $ in Thousands		3 Months Ended		4 Months Ended	9 Months Ended
	Jun. 12, 2018	Sep. 29, 2019	Sep. 30, 2018	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Acquisition-related costs		$ 362	$ 1,226		$ 1,612	$ 1,683
Revenue from services		636,793	680,371		1,777,739	1,849,060
TMP
Business Acquisition [Line Items]
Cash purchase price, net of cash acquired	$ 22,742
Cash acquired from acquisition	$ 7,000
Acquisition-related costs		400	$ 1,200		1,600	$ 1,700
Revenue from services		$ 13,800		$ 17,900	$ 40,700

X

- 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.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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X

- Definition

The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

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- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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