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Credit Facility (Narrative) (Details) - Revolving line of credit facility [Member] - USD ($)
6 Months Ended
Jul. 02, 2021
Jan. 01, 2021
Line of Credit Facility [Line Items]    
Borrowing capacity under credit facility $ 45,000,000.0  
Maturity date Nov. 30, 2022  
Pledge of capital stock to U.S. subsidiaries 100.00%  
Pledge of capital stock to direct foreign subsidiaries 66.00%  
Outstanding balance $ 0 $ 0
Commitment fees percentage 0.125%  
London Interbank Offered Rate (LIBOR) [Member]    
Line of Credit Facility [Line Items]    
Margin percentage base rate 1.50%  
Base Rate [Member]    
Line of Credit Facility [Line Items]    
Margin percentage base rate 0.75%