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Prepaid Expenses and Other Current Assets, and Other Assets (Details) (USD $)
 9 Months Ended
Sep. 27, 2014
Dec. 28, 2013
Prepaid expenses and other current assets    
Term loans to employees $ 1,664,000 $ 1,764,000
Other 12,432,000 10,011,000
Total 14,096,000 11,775,000
Other assets    
Forgivable loans to employees and non-employee experts 44,624,000 51,083,000
Other 2,633,000 3,538,000
Total 47,257,000 54,621,000
Prepaid expenses and other assets disclosures    
Term of forgivable loans or advances to employees and non-employee experts, minimum 3 years  
Term of forgivable loans or advances to employees and non-employee experts, maximum 8 years  
Forgivable loans issued to future employees for future service $ 10,200,000