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Forgivable Loans (Details)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Amount of forgivable loans write-down or write-off $ 0 $ 0
Forgivable loan activity    
Beginning balance 33,962 44,685
Advances 11,672 6,949
Accrued Advances   316
Repayments (2,135) (709)
Reclassification to other assets (1,100)  
Amortization (14,155) (16,575)
Effects of foreign currency translation 384 (704)
Ending balance 28,628 33,962
Current portion of forgivable loans 5,540 5,897
Non-current portion of forgivable loans 23,088 28,065
Other loans to current and former employees    
Other loans to current and former employees, included in other assets, net of allowances $ 300 $ 200
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