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Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Assets:    
Money market funds and time deposits $ 10,561 $ 9,920
Banker's acceptance drafts 4,423 5,230
2015 Swap Agreement   11
Forward currency-exchange contract(s) 29 3
Liabilities:    
2018 Swap Agreement 1,202 770
Forward currency-exchange contracts 19 118
Level 1    
Assets:    
Money market funds and time deposits 10,561 9,920
Banker's acceptance drafts 0 0
2015 Swap Agreement   0
Forward currency-exchange contract(s) 0 0
Liabilities:    
2018 Swap Agreement 0 0
Forward currency-exchange contracts 0 0
Level 2    
Assets:    
Money market funds and time deposits 0 0
Banker's acceptance drafts 4,423 5,230
2015 Swap Agreement   11
Forward currency-exchange contract(s) 29 3
Liabilities:    
2018 Swap Agreement 1,202 770
Forward currency-exchange contracts 19 118
Level 3    
Assets:    
Money market funds and time deposits 0 0
Banker's acceptance drafts 0 0
2015 Swap Agreement   0
Forward currency-exchange contract(s) 0 0
Liabilities:    
2018 Swap Agreement 0 0
Forward currency-exchange contracts $ 0 $ 0