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ACQUISITIONS (SIMOS Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Dec. 01, 2015 | Mar. 25, 2016 | Mar. 27, 2015 | Dec. 25, 2015
Business Acquisition [Line Items] |  |  |  |  |
Amortization of Intangible Assets |  |  | $ 6,100 | $ 5,200 |
SIMOS Insourcing Solutions Corporation [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash purchase price, net of working capital adjustment |  | $ 66,600 |  |  |
EBITDA target threshold |  | 87.50% |  |  |
Contingent consideration | [1] | $ 18,300 |  |  |
Pro forma information, revenue of acquiree |  |  | 36,100 |  |
Pro forma information, earnings or loss |  |  | 1,900 |  |
Amortization of Intangible Assets |  |  | $ 1,100 |  |
Maximum | SIMOS Insourcing Solutions Corporation [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration |  | 22,500 |  |  |
Level 3 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration | [2] |  |  |  | $ 19,300
Level 3 | SIMOS Insourcing Solutions Corporation [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration, liability |  | $ 21,100 |  |  |
Discount Rate |  | 10.00% |  |  |
Contingent consideration | [2] | $ 18,900 |  |  |
[1] | The preliminary valuation of customer relationships was increased by $0.6 million and contingent consideration decreased by $1.0 million as a result of our final valuation. The preliminary purchase price allocation for restricted cash was increased by $3.0 million for confirmation of cash held by third-party administrators for payment of workers' compensation claims.
[2] | The estimated fair value of the contingent consideration associated with the acquisition of SIMOS, which was estimated using a probability-adjusted discounted cash flow model. Refer to Note 2: Acquisitions for further details regarding the SIMOS acquisition.

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