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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 [Member] - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Assets:    
Money market funds and time deposits $ 3,579 $ 17,728
Forward currency-exchange contract   17
2015 Swap Agreement 209 126
Banker's acceptance drafts 10,735 15,960
Liabilities:    
Forward currency-exchange contracts 52 16
2018 Swap Agreement 210  
Level 1 [Member]    
Assets:    
Money market funds and time deposits 3,579 17,728
Forward currency-exchange contract   0
2015 Swap Agreement 0 0
Banker's acceptance drafts 0 0
Liabilities:    
Forward currency-exchange contracts 0 0
2018 Swap Agreement 0  
Level 2 [Member]    
Assets:    
Money market funds and time deposits 0 0
Forward currency-exchange contract   17
2015 Swap Agreement 209 126
Banker's acceptance drafts 10,735 15,960
Liabilities:    
Forward currency-exchange contracts 52 16
2018 Swap Agreement 210  
Level 3 [Member]    
Assets:    
Money market funds and time deposits 0 0
Forward currency-exchange contract   0
2015 Swap Agreement 0 0
Banker's acceptance drafts 0 0
Liabilities:    
Forward currency-exchange contracts 0 $ 0
2018 Swap Agreement $ 0