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Prepaid Expenses and Other Assets, and Other Assets (Details) (USD $)
 9 Months Ended
Sep. 28, 2013
Dec. 29, 2012
Prepaid expenses and other assets    
Forgivable Loans and term loans to employees and non-employee experts $ 4,596,000 $ 11,875,000
Subscriptions and licenses 1,758,000 1,395,000
Income taxes receivable 1,731,000 4,104,000
Prepaid insurance 1,585,000 1,330,000
Prepaid rent and deposits 1,190,000 968,000
Other 2,685,000 3,329,000
Total 13,545,000 23,001,000
Other assets    
Forgivable loans and term loans to employees and non-employee experts 50,597,000 17,364,000
Other 3,668,000 4,307,000
Total 54,265,000 21,671,000
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 employees and non-employee experts for future service $ 38,100,000