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FAIR VALUE MEASUREMENTS - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 27, 2017 | Dec. 28, 2016 | Sep. 28, 2016 | Dec. 30, 2015
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost Basis | $ 26,887 | $ 11,607 | $ 12,227 | $ 70,849
Cash and cash equivalents fair value | 26,887 | 11,607 |  |
Gross Unrealized Gains | 62 | 3 |  |
Gross Unrealized Losses | (25) | (30) |  |
Fair Value Including Mutual Funds | 90,186 |  |  |
Fair Value |  | 74,285 |  |
Fair value of marketable securities | 63,299 | 62,678 |  |
Total cost basis including Mutual Funds | 90,149 | 74,312 |  |
Level 1 | Mutual funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Mutual funds | 60,769 | 60,232 |  |
Fair value of marketable securities | 60,829 | 60,232 |  |
Level 2 | Mutual funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross Unrealized Gains | 60 |  |  |
Level 2 | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Corporate debt securities | 2,493 | 2,473 |  |
Gross Unrealized Gains | 2 | 3 |  |
Gross Unrealized Losses | (25) | (30) |  |
Fair value of marketable securities | 2,470 | 2,446 |  |
Cash |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost Basis | 21,862 | 6,322 |  |
Cash and cash equivalents fair value | 21,862 | 6,322 |  |
Money market funds | Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost Basis | 5,025 | 5,285 |  |
Cash and cash equivalents fair value | $ 5,025 | $ 5,285 |  |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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