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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
Mar. 31, 2018
Dec. 30, 2017
Assets:    
Money market funds and time deposits $ 19,745 $ 17,728
Forward currency-exchange contract 24 17
Interest rate swap agreement 204 126
Banker's acceptance drafts 12,021 15,960
Liabilities:    
Forward currency-exchange contracts 1 16
Level 1 [Member]    
Assets:    
Money market funds and time deposits 19,745 17,728
Forward currency-exchange contract 0 0
Interest rate swap agreement 0 0
Banker's acceptance drafts 0 0
Liabilities:    
Forward currency-exchange contracts 0 0
Level 2 [Member]    
Assets:    
Money market funds and time deposits 0 0
Forward currency-exchange contract 24 17
Interest rate swap agreement 204 126
Banker's acceptance drafts 12,021 15,960
Liabilities:    
Forward currency-exchange contracts 1 16
Level 3 [Member]    
Assets:    
Money market funds and time deposits 0 0
Forward currency-exchange contract 0 0
Interest rate swap agreement 0 0
Banker's acceptance drafts 0 0
Liabilities:    
Forward currency-exchange contracts $ 0 $ 0