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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($) | 12 Months Ended
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Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016
Property, Plant and Equipment [Line Items] |  |  |
Impairment charges | $ 0 | $ 0 | $ 0
Equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of asset | 3 years |  |
Equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of asset | 7 years |  |
Furniture and fixtures | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of asset | 3 years |  |
Furniture and fixtures | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of asset | 7 years |  |
Computer equipment and software | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of asset | 3 years |  |
Computer equipment and software | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of asset | 7 years |  |
Leasehold improvements | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of asset | 10 years |  |
Leasehold improvements | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of asset | 15 years |  |
Landlord funded assets | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of asset | 10 years |  |
Landlord funded assets | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of asset | 15 years |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- 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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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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