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FAIR VALUE MEASUREMENTS - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 28, 2016 | Dec. 30, 2015 | Dec. 31, 2014 | Dec. 25, 2013 | Dec. 26, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Gross proceeds from sales and redemptions |  | $ 938,000 | $ 0 | $ 0 |  |
Dividend income |  | 296,000 | 0 | 0 |  |
Interest income |  | 88,000 | 7,000 | 0 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 1,244,000 | 2,397,000 |  |  |
Cash cost basis |  | 11,607,000 | 70,849,000 |  | $ 2,677,000 | $ 13,076,000
Cash and cash equivalents fair value |  | 11,607,000 | 70,849,000 |  |  |
Gross Unrealized Gains |  | 3,000 | 1,000 |  |  |
Gross Unrealized Losses |  | (30,000) | (12,000) |  |  |
Fair value of marketable securities |  | 62,678,000 | 2,386,000 |  |  |
Total cost basis |  | 74,312,000 | 73,246,000 |  |  |
Total fair value |  | 74,285,000 | 73,235,000 |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (10,000) | (12,000) |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 540,000 | 0 |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (20,000) | 0 |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 1,784,000 | 2,397,000 |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (30,000) | (12,000) |  |  |
Marketable Securities, Realized Gain (Loss) |  | (7,000) | 0 | 0 |  |
Available-for-sale Securities, Gross Realized Gain (Loss) |  | 377,000 | 7,000 | 0 |  |
Available-for-sale Securities, Amortized Cost Basis, Securities Sold |  | 956,000 |  |  |  |
Available-for-sale Securities, Gross Realized Gains |  | 2,000 |  |  |  |
Available-for-sale Securities, Gross Realized Losses |  | (20,000) |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | [1] | 19,000 | 0 | $ 0 |  |
Corporate debt securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 1,244,000 | 2,397,000 |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (10,000) | (12,000) |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 540,000 | 0 |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (20,000) | 0 |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 1,784,000 | 2,397,000 |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (30,000) | (12,000) |  |  |
Fair Value, Inputs, Level 1 | Mutual Fund |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Cash cost basis |  | 60,232,000 |  |  |  |
Fair value of marketable securities |  | 60,232,000 |  |  |  |
Fair Value, Inputs, Level 2 | Corporate debt securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Marketable securities cost Basis |  | 2,473,000 | 2,397,000 |  |  |
Gross Unrealized Gains |  | 3,000 | 1,000 |  |  |
Gross Unrealized Losses |  | (30,000) | (12,000) |  |  |
Fair value of marketable securities |  | 2,446,000 | 2,386,000 |  |  |
Cash |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Cash cost basis |  | 6,322,000 | 70,816,000 |  |  |
Cash and cash equivalents fair value |  | 6,322,000 | 70,816,000 |  |  |
Money market funds | Fair Value, Inputs, Level 1 |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Cash cost basis |  | 5,285,000 | 33,000 |  |  |
Cash and cash equivalents fair value |  | $ 5,285,000 | $ 33,000 |  |  |
[1] | Net of tax benefit of $0 for fiscal years ended December 28, 2016, December 30, 2015 and December 31, 2014.

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