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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Basis of Presentation (Details) - USD ($) $ in Thousands	Dec. 26, 2018	Dec. 27, 2017
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Net assets of SSE Holdings	$ 232,711	$ 197,301

X

- Definition

The net carrying amount of the consolidated Variable Interest Entity's assets and liabilities included in the reporting entity's statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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- Details

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