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Venture Capital Investments and Marketable Securities - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 03, 2016	Sep. 24, 2016	Sep. 26, 2015	Sep. 24, 2016	Sep. 26, 2015	Dec. 26, 2015
Schedule of Equity Method Investments [Line Items]
Committed contribution		$ 80,600,000		$ 80,600,000
Committed contributions funded		35,300,000		35,300,000
Dividends received		2,303,000	$ 5,300,000	2,300,000	$ 7,300,000
Gain (loss) from venture capital investments		400,000	$ 3,200,000
Marketable securities		0		0		$ 4,509,000
Proceeds from sale of available-for-sale securities		$ 4,600,000		$ 4,600,000	$ 0
Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage		2.70%		2.70%
Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage		12.00%		12.00%
Subsequent Event
Schedule of Equity Method Investments [Line Items]
Increase in committed contribution	$ 4,300,000

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