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Prepaid Expenses and Other Current Assets, and Other Assets (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Mar. 30, 2014
Subsequent event
Prepaid expenses and other current assets      
Term loans to employees and non-employee experts $ 1,764,000 $ 8,614,000  
Other 10,011,000 14,387,000  
Total 11,775,000 23,001,000  
Other assets      
Forgivable loans to employees and non-employee experts 51,083,000 15,448,000  
Other 3,538,000 6,223,000  
Total 54,621,000 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 issuable to future employees for future service 5,000,000    
Prepaid Expenses and Other Current Assets, and Other Assets      
Forgivable loans issued to future employees for future service $ 38,800,000 $ 20,700,000 $ 5,000,000