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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

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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- 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

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- Definition

Amount of increase (decrease) of the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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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

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