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VENTURE CAPITAL INVESTMENTS AND MARKETABLE SECURITIES (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
Marketable Securities and Equity-Method Affiliates [Abstract] |  |  |
Gains related to venture capital investments | $ 10,284,000 | $ 3,823,000 | $ 9,301,000
Total commitment | 84,800,000 |  |
Venture capital investments | 38,200,000 |  |
Dividends received | 7,100,000 | 7,300,000 | $ 7,400,000
Consolidated retained earnings (accumulated deficit) | 4,400,000 | 2,400,000 |
Sales of available for sale securities | 4,600,000 | 0 |
Marketable securities | $ 0 | $ 4,509,000 |

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