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SEGMENT INFORMATION SEGMENT GEOGRAPHICAL (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Jan. 01, 2017 | Sep. 23, 2016 | Jun. 24, 2016 | Mar. 25, 2016 | Dec. 31, 2017 | Jan. 01, 2017 | Dec. 25, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from services | $ 669,625 | $ 660,780 | $ 610,122 | $ 568,244 | $ 734,951 | $ 697,097 | $ 672,612 | $ 645,980 | $ 2,508,771 | $ 2,750,640 | $ 2,695,680
Revenue from sales, percent |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from services |  |  |  |  |  |  |  |  | $ 2,387,992 | $ 2,644,414 | $ 2,603,085
Revenue from sales, percent |  |  |  |  |  |  |  |  | 95.20% | 96.10% | 96.60%
International operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from services |  |  |  |  |  |  |  |  | $ 120,779 | $ 106,226 | $ 92,595
Revenue from sales, percent |  |  |  |  |  |  |  |  | 4.80% | 3.90% | 3.40%

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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