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Forgivable Loans (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 27, 2020
Dec. 28, 2019
Forgivable Loans    
Allowances for forgivable loans $ 0 $ 0
Amount of forgivable loans written-off 0 0
Forgivable loan activity    
Beginning balance 55,141 40,294
Advances 38,374 35,166
Repayments   (1,173)
Reclassification from accrued expenses / to other assets (9,713) (1,734)
Amortization (12,848) (17,700)
Effects of foreign currency translation (453) 288
Ending balance 70,501 55,141
Current portion of forgivable loans 9,380 6,751
Non-current portion of forgivable loans $ 61,121 $ 48,390