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VENTURE CAPITAL INVESTMENTS AND MARKETABLE SECURITIES - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Marketable Securities and Equity-Method Affiliates [Abstract]
Gains related to venture capital investments	$ 22,867,000	$ 10,284,000	$ 3,823,000
Total commitment	88,200,000
Venture capital investments	51,200,000
Dividends received	10,100,000	7,100,000	$ 7,300,000
Consolidated retained earnings (accumulated deficit)	12,100,000	4,400,000
Marketable securities	$ 0	0
Sales of available for sale securities		$ 4,600,000

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Equity Method Investment, Investment Commitment

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

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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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