FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands	Jun. 24, 2016	Dec. 25, 2015	Dec. 01, 2015
Fair Value Measurement [Line Items]
Other restricted assets	$ 14,320	$ 11,944
Restricted investments classified as held-to-maturity	142,553	128,245
Contingent consideration	19,300	0
Total Fair Value
Fair Value Measurement [Line Items]
Cash and cash equivalents	21,772	29,781
Contingent consideration	19,300	19,300
Total Fair Value \| Restricted Assets
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	51,643	49,680
Other restricted assets	14,320	11,944
Restricted investments classified as held-to-maturity	142,553	128,245
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Measurement [Line Items]
Cash and cash equivalents	21,772	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	51,643	49,680
Other restricted assets	14,320	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	142,553	128,245
Significant Unobservable Inputs (Level 3)
Fair Value Measurement [Line Items]
Cash and cash equivalents	0	0
Contingent consideration		19,300
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 \| Significant Unobservable Inputs (Level 3)
Fair Value Measurement [Line Items]
Contingent consideration	$ 19,300

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Fair value of investments in debt securities classified as held-to-maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Other long-term assets not otherwise listed in the existing taxonomy that are pledged or subject to withdrawal restrictions.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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