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Venture Capital Investments and Marketable Securities - Summary of Marketable Securities (Details) - USD ($)	Sep. 24, 2016	Dec. 26, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost		$ 4,650,000
Gross Unrealized Gains		0
Gross Unrealized Losses		(141,000)
Fair Value	$ 0	4,509,000
Mutual fund
Schedule of Available-for-sale Securities [Line Items]
Cost		4,650,000
Gross Unrealized Gains		0
Gross Unrealized Losses		(141,000)
Fair Value		$ 4,509,000

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

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