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Forgivable Loans (Details)
$ in Thousands
 12 Months Ended
Dec. 28, 2019
USD ($)
Dec. 29, 2018
USD ($)
Amount of forgivable loans write-down or write-off $ 0 $ 0
Forgivable loan activity    
Beginning balance 40,294 28,628
Advances 35,166 30,572
Repayments (1,173) (3,396)
Reclassification to other assets (1,734)  
Amortization (17,700) (15,329)
Effects of foreign currency translation 288 (181)
Ending balance 55,141 40,294
Current portion of forgivable loans 6,751 6,104
Non-current portion of forgivable loans 48,390 34,190
Other loans to current and former employees    
Other loans to current and former employees, included in other assets, net of allowances $ 0 $ 100
Minimum    
Term of forgivable loans or advances 2 years  
Maximum    
Term of forgivable loans or advances 8 years  
Interest rates (as a percent) 3.25