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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands | Mar. 25, 2016 | Dec. 25, 2015 | Dec. 01, 2015
--- | --- | --- | ---
Fair Value Measurement [Line Items] |  |  |  |
Other restricted assets | [1] | $ 13,874 | $ 11,944 |
Restricted investments classified as held-to-maturity |  | 136,843 | 128,245 |
Total Fair Value |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | [2] | 21,888 | 29,781 |
Contingent consideration | [3] | 18,900 | 19,300 |
Total Fair Value | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | [2] | 54,537 | 49,680 |
Other restricted assets | [4] | 13,874 | 11,944 |
Restricted investments classified as held-to-maturity |  | 136,843 | 128,245 |
Level 1 |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | [2] | 21,888 | 29,781 |
Contingent consideration | [3] | 0 | 0 |
Level 1 | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | [2] | 54,537 | 49,680 |
Other restricted assets | [4] | 13,874 | 11,944 |
Restricted investments classified as held-to-maturity |  | 0 | 0 |
Level 2 |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | [2] | 0 | 0 |
Contingent consideration | [3] | 0 | 0 |
Level 2 | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | [2] | 0 | 0 |
Other restricted assets | [4] | 0 | 0 |
Restricted investments classified as held-to-maturity |  | 136,843 | 128,245 |
Level 3 |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | [2] | 0 | 0 |
Contingent consideration | [3] |  | 19,300 |
Level 3 | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | [2] | 0 | 0 |
Other restricted assets | [4] | 0 | 0 |
Restricted investments classified as held-to-maturity |  | $ 0 | $ 0 |
SIMOS Insourcing Solutions Corporation [Member] |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Contingent consideration | [5] |  |  | $ 18,300
SIMOS Insourcing Solutions Corporation [Member] | Level 3 |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Contingent consideration | [3] |  |  | $ 18,900
[1] | Primarily consists of deferred compensation plan accounts, which are comprised of mutual funds classified as available-for-sale securities.
[2] | Cash equivalents and restricted cash equivalents consist of money market funds, deposits, and investments with original maturities of three months or less.
[3] | 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.
[4] | Other restricted assets primarily consist of deferred compensation plan accounts, which are comprised of mutual funds classified as available-for-sale securities.
[5] | 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.

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