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Venture Capital Investments and Marketable Securities - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 25, 2016
Jun. 27, 2015
Jun. 25, 2016
Jun. 27, 2015
Schedule of Equity Method Investments [Line Items]        
Committed contribution $ 80,600,000   $ 80,600,000  
Committed contributions funded 34,000,000   34,000,000  
Dividends received 0 $ 2,100,000 $ 0 $ 2,100,000
Gain (loss) from venture capital investments $ 5,000,000 $ (900,000)    
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%