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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands | Sep. 23, 2016 | Dec. 25, 2015 | Dec. 01, 2015
--- | --- | --- | ---
Fair Value Measurement [Line Items] |  |  |  |
Other restricted assets | [1] | $ 15,884 | $ 11,944 |
Restricted investments classified as held-to-maturity |  | 152,563 | 128,245 |
Contingent consideration |  | 19,800 | 0 |
Total Fair Value |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | [2] | 24,781 | 29,781 |
Total Fair Value | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | [2] | 48,273 | 49,680 |
Other restricted assets | [3] | 15,884 | 11,944 |
Restricted investments classified as held-to-maturity |  | 152,563 | 128,245 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | [2] | 24,781 | 29,781 |
Contingent consideration | [4] | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | [2] | 48,273 | 49,680 |
Other restricted assets | [3] | 15,884 | 11,944 |
Restricted investments classified as held-to-maturity |  | 0 | 0 |
Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | [2] | 0 | 0 |
Contingent consideration | [4] | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | [2] | 0 | 0 |
Other restricted assets | [3] | 0 | 0 |
Restricted investments classified as held-to-maturity |  | 152,563 | 128,245 |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | [2] | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | [2] | 0 | 0 |
Other restricted assets | [3] | 0 | 0 |
Restricted investments classified as held-to-maturity |  | 0 | 0 |
SIMOS Insourcing Solutions Corporation |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Contingent consideration |  |  |  | $ 18,300
SIMOS Insourcing Solutions Corporation | Total Fair Value |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Contingent consideration | [4] | 19,800 | 19,300 |
SIMOS Insourcing Solutions Corporation | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Contingent consideration | [4] | $ 19,800 | $ 19,300 |
[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] | Other restricted assets primarily consist of deferred compensation plan accounts, which are comprised of mutual funds classified as available-for-sale securities.
[4] | 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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