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FAIR VALUE MEASUREMENTS (Tables) | 9 Months Ended
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Sep. 27, 2017
Fair Value Disclosures [Abstract] |
Schedule of Cash and Cash Equivalents | The following tables summarize our cash, cash equivalents and marketable securities by significant investment categories as of September 27, 2017 and December 28, 2016:
|  | September 27, 2017 |
| Cost Basis |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities |
Cash | $ | 21,862 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,862 |  |  | $ | 21,862 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |
| Money market funds | 5,025 |  |  | — |  |  | — |  |  | 5,025 |  |  | 5,025 |  |  | — |
| Mutual funds | 60,769 |  |  | 60 |  |  | — |  |  | 60,829 |  |  | — |  |  | 60,829 |
Level 2: |  |  |  |  |  |  |  |  |  |  |
| Corporate debt securities(1) | 2,493 |  |  | 2 |  |  | (25 | ) |  | 2,470 |  |  | — |  |  | 2,470 |
Total | $ | 90,149 |  |  | $ | 62 |  |  | $ | (25 | ) |  | $ | 90,186 |  |  | $ | 26,887 |  |  | $ | 63,299 |
|  | December 28, 2016 |
| Cost Basis |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities |
Cash | $ | 6,322 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,322 |  |  | $ | 6,322 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |
| Money market funds | 5,285 |  |  | — |  |  | — |  |  | 5,285 |  |  | 5,285 |  |  | — |
| Mutual funds | 60,232 |  |  | — |  |  | — |  |  | 60,232 |  |  | — |  |  | 60,232 |
Level 2: |  |  |  |  |  |  |  |  |  |  |
| Corporate debt securities(1) | 2,473 |  |  | 3 |  |  | (30 | ) |  | 2,446 |  |  | — |  |  | 2,446 |
Total | $ | 74,312 |  |  | $ | 3 |  |  | $ | (30 | ) |  | $ | 74,285 |  |  | $ | 11,607 |  |  | $ | 62,678 |
(1) Corporate debt securities were measured at fair value using a market approach utilizing observable prices for identical securities or securities with similar characteristics and inputs that are observable or can be corroborated by observable market data
Schedule of Unrealized Loss on Investments | The following tables summarize the gross unrealized losses and fair values for those investments that were in an unrealized loss position as of September 27, 2017 and December 28, 2016, aggregated by investment category and the length of time that individual securities have been in a continuous loss position:
|  | September 27, 2017 |
|  | Less than 12 Months |  |  | 12 Months or Greater |  |  | Total |
| Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
| Money market funds | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
| Mutual funds | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| Corporate debt securities | 1,638 |  |  | (9 | ) |  | 322 |  |  | (16 | ) |  | 1,960 |  |  | (25 | )
Total | $ | 1,638 |  |  | $ | (9 | ) |  | $ | 322 |  |  | $ | (16 | ) |  | $ | 1,960 |  |  | $ | (25 | )
|  | December 28, 2016 |
|  | Less than 12 Months |  |  | 12 Months or Greater |  |  | Total |
| Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
| Money market funds | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
| Mutual funds | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| Corporate debt securities | 1,244 |  |  | (10 | ) |  | 540 |  |  | (20 | ) |  | 1,784 |  |  | (30 | )
Total | $ | 1,244 |  |  | $ | (10 | ) |  | $ | 540 |  |  | $ | (20 | ) |  | $ | 1,784 |  |  | $ | (30 | )
Schedule of Other Income From Available for Sale Securities | A summary of other income from available-for-sale securities recognized during the thirteen and thirty-nine weeks ended September 27, 2017 and September 28, 2016 is as follows:
|  | Thirteen Weeks Ended |  |  | Thirty-Nine Weeks Ended |
| September 27 2017 |  |  | September 28 2016 |  |  | September 27 2017 |  |  | September 28 2016 |
Available-for-sale securities: |  |  |  |  |  |  |
| Dividend income | $ | 222 |  |  | $ | 133 |  |  | $ | 591 |  |  | $ | 133 |
| Interest income | 19 |  |  | 22 |  |  | 58 |  |  | 68 |
| Loss on investments | (12 | ) |  | (4 | ) |  | (27 | ) |  | (4 | )
Total other income, net | $ | 229 |  |  | $ | 151 |  |  | $ | 622 |  |  | $ | 197 |
Schedule of Available-for-sale Securities and Gross Realized Gains and Losses | A summary of available-for-sale securities sold and gross realized gains and losses recognized during the thirteen and thirty-nine weeks ended September 27, 2017 and September 28, 2016 is as follows:
|  | Thirteen Weeks Ended |  |  | Thirty-Nine Weeks Ended |
| September 27 2017 |  |  | September 28 2016 |  |  | September 27 2017 |  |  | September 28 2016 |
Available-for-sale securities: |  |  |  |  |  |  |
| Gross proceeds from sales and redemptions | $ | 584 |  |  | $ | 176 |  |  | $ | 1,212 |  |  | $ | 498 |
| Cost basis of sales and redemptions | 597 |  |  | 180 |  |  | 1,239 |  |  | 502 |
| Gross realized gains included in net income | 1 |  |  | — |  |  | 1 |  |  | 1 |
| Gross realized losses included in net income | (13 | ) |  | (4 | ) |  | (28 | ) |  | (5 | )
| Amounts reclassified out of accumulated other comprehensive loss | 14 |  |  | 3 |  |  | 28 |  |  | 3 |

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- Definition Tabular disclosure of the realized and unrealized gains and losses reported in the statement of income which have resulted from the sale and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale or disposal of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.M) -URI http://asc.fasb.org/extlink&oid=65877573&loc=d3e87990-122713 + Details
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