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ACQUISITIONS (Aon Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 04, 2016 | Dec. 31, 2017 | Jan. 01, 2017 | Jan. 01, 2017 | Dec. 25, 2015
Business Acquisition [Line Items] |  |  |  |  |
Cash purchase price, net of working capital adjustment |  | $ 0 | $ 72,476 |  | $ 67,500
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 |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  |  |  | $ 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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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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