FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands	Jan. 01, 2017	Dec. 25, 2015	Dec. 01, 2015
Fair Value Measurement [Line Items]
Other restricted assets	$ 16,925	$ 11,944
Restricted investments classified as held-to-maturity	145,953	128,245
Contingent consideration	21,600	0
Total Fair Value
Fair Value Measurement [Line Items]
Cash and cash equivalents	34,970	29,781
Total Fair Value \| Restricted Assets
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	67,751	49,680
Other restricted assets	16,925	11,944
Restricted investments classified as held-to-maturity	145,953	128,245
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Measurement [Line Items]
Cash and cash equivalents	34,970	29,781
Contingent consideration	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Restricted Assets
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	67,751	49,680
Other restricted assets	16,925	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	0	0
Contingent consideration	0	0
Significant Other Observable Inputs (Level 2) \| Restricted Assets
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	0	0
Other restricted assets	0	0
Restricted investments classified as held-to-maturity	145,953	128,245
Significant Unobservable Inputs (Level 3)
Fair Value Measurement [Line Items]
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) \| Restricted Assets
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	0	0
Other restricted assets	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	21,600	19,300
SIMOS Insourcing Solutions Corporation \| Significant Unobservable Inputs (Level 3)
Fair Value Measurement [Line Items]
Contingent consideration	$ 21,600	$ 19,300

Amount of liability recognized arising from contingent consideration in a business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value of investments in debt securities classified as held-to-maturity.

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Amount of noncurrent assets that are pledged or subject to withdrawal restrictions, classified as other.

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