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VENTURE CAPITAL INVESTMENTS AND MARKETABLE SECURITIES (Details) - USD ($)	12 Months Ended
	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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Equity Method Investment, Investment Commitment

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Marketable Securities and Equity-Method Affiliates [Abstract]

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Name Accounting Standards Codification
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Amount of consolidated retained earnings that represent undistributed (not yet received) earnings from 50% or less owned persons accounted for by the equity method (equity method investees).

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Amount of gain (loss) on venture capital activities. Includes venture capital revenue, fair value adjustments, interest and dividends, investment gain (loss) and fee or other income from venture capital activities.

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