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SEGMENT INFORMATION SEGMENT GEOGRAPHICAL (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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
Segment Reporting Information [Line Items]
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
Revenue from sales, percent									100.00%	100.00%	100.00%
UNITED STATES
Segment Reporting Information [Line Items]
Revenue from services									$ 2,369,024	$ 2,387,992	$ 2,644,414
Revenue from sales, percent									94.80%	95.20%	96.10%
International operations
Segment Reporting Information [Line Items]
Revenue from services									$ 130,183	$ 120,779	$ 106,226
Revenue from sales, percent									5.20%	4.80%	3.90%

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Sales Revenue, Services, Percent of Revenue

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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