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BUSINESS ACQUISITIONS AND DIVESTITURE - Sunrise, Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	May 05, 2015	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Business Acquisition [Line Items]
Bargain purchase gain		$ (277)	$ 16	$ (9,837)
Sunrise
Business Acquisition [Line Items]
Purchase price	$ 9,558
Bargain purchase gain	(9,821)
Cash acquired	$ 100
Transaction and integration costs				$ 1,500
Sunrise | Client relationships
Business Acquisition [Line Items]
Weighted average useful life	15 years

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Business Combination, Integration Related Costs and Transaction Costs

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In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

+ References

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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