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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 26, 2018
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 December 26, 2018 and December 27, 2017:
|  | December 26, 2018 |
| Cost Basis |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities |
Cash | $ | 19,746 |  |  | $ | — |  |  | $ | — |  |  | $ | 19,746 |  |  | $ | 19,746 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |
| Money market funds | 5,004 |  |  | — |  |  | — |  |  | 5,004 |  |  | 5,004 |  |  | — |
| Mutual funds | 62,235 |  |  | — |  |  | (122 | ) |  | 62,113 |  |  | — |  |  | 62,113 |
Level 2: |  |  |  |  |  |  |  |  |  |  |
| Corporate debt securities(1) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total | $ | 86,985 |  |  | $ | — |  |  | $ | (122 | ) |  | $ | 86,863 |  |  | $ | 24,750 |  |  | $ | 62,113 |
|  | December 27, 2017 |
| Cost Basis |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities |
Cash | $ | 16,138 |  |  | $ | — |  |  | $ | — |  |  | $ | 16,138 |  |  | $ | 16,138 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |
| Money market funds | 5,369 |  |  | — |  |  | — |  |  | 5,369 |  |  | 5,369 |  |  | — |
| Mutual funds | 60,985 |  |  | — |  |  | (61 | ) |  | 60,924 |  |  | — |  |  | 60,924 |
Level 2: |  |  |  |  |  |  |  |  |  |  |
| Corporate debt securities(1) | 2,125 |  |  | 2 |  |  | (15 | ) |  | 2,112 |  |  | — |  |  | 2,112 |
Total | $ | 84,617 |  |  | $ | 2 |  |  | $ | (76 | ) |  | $ | 84,543 |  |  | $ | 21,507 |  |  | $ | 63,036 |
(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 investments in debt securities that were in an unrealized loss position as of December 26, 2018 and December 27, 2017, aggregated by length of time that individual securities have been in a continuous loss position:
|  | Less than 12 Months |  |  | 12 Months or Greater |  |  | Total |
| Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
| As of December 26, 2018 | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| As of December 27, 2017 | 1,675 |  |  | (12 | ) |  | 162 |  |  | (3 | ) |  | 1,837 |  |  | (15 | )
Schedule of Gain (Loss) on Investments | A summary of other income from available-for-sale securities recognized during fiscal 2018, 2017 and 2016 is as follows:
| 2018 |  |  | 2017 |  |  | 2016 |
Available-for-sale securities: |  |  |  |  |
| Dividend income | $ | 1,392 |  |  | $ | 830 |  |  | $ | 296 |
| Interest income | 9 |  |  | 77 |  |  | 88 |
| Loss on investments | (3 | ) |  | (5 | ) |  | (7 | )
| Unrealized loss on available-for-sale equity securities | (61 | ) |  | — |  |  | — |
Total other income, net | $ | 1,337 |  |  | $ | 902 |  |  | $ | 377 |
Schedule of Realized Gain (Loss) | A summary of available-for-sale securities sold and gross realized gains and losses recognized during fiscal 2018, 2017 and 2016 is as follows:
| 2018 |  |  | 2017 |  |  | 2016 |
Available-for-sale securities: |  |  |  |  |
| Gross proceeds from sales and redemptions | $ | 2,144 |  |  | $ | 2,223 |  |  | $ | 938 |
| Cost basis of sales and redemptions | 2,160 |  |  | 2,271 |  |  | 956 |
| Gross realized gains included in net income | 2 |  |  | 1 |  |  | 2 |
| Gross realized losses included in net income | (18 | ) |  | (49 | ) |  | (20 | )
| Amounts reclassified out of accumulated other comprehensive loss | 16 |  |  | 47 |  |  | 19 |

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