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Forgivable Loans (Details)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
USD ($)
Dec. 30, 2017
USD ($)
Amount of forgivable loans write-down or write-off $ 0 $ 0
Forgivable loan activity    
Beginning balance 28,628 33,962
Advances 30,572 11,672
Repayments (3,396) (2,135)
Reclassification to other assets   (1,100)
Amortization (15,329) (14,155)
Effects of foreign currency translation (181) 384
Ending balance 40,294 28,628
Current portion of forgivable loans 6,104 5,540
Non-current portion of forgivable loans 34,190 23,088
Other loans to current and former employees    
Other loans to current and former employees, included in other assets, net of allowances $ 100 $ 300
Minimum    
Term of forgivable loans or advances 3 years  
Maximum    
Term of forgivable loans or advances 8 years  
Interest rates (as a percent) 0.0325