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Debt (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 25, 2020
Dec. 27, 2019
Line of Credit Facility [Line Items]      
Estimated fair value of debt $ 165,000,000 $ 170,000,000  
Maximum borrowing amount - credit facility 595,000,000    
Interest paid 9,800,000 11,300,000 $ 13,500,000
Total debt, including current portion 193,489,000 172,183,000  
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Chinese Renminbi Facility Maximum Borrowing Capacity 50,000,000    
Committed Facility      
Line of Credit Facility [Line Items]      
Unused portion of credit facility 525,000,000    
Committed Facility | Domestic Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing amount - credit facility 550,000,000    
Committed Facility | Foreign Line of Credit      
Line of Credit Facility [Line Items]      
Maximum borrowing amount - credit facility 45,000,000    
Uncommitted Facility | Foreign Line of Credit      
Line of Credit Facility [Line Items]      
Unused portion of credit facility $ 28,000,000    
Uncommitted Facility | Foreign Line of Credit | Maximum      
Line of Credit Facility [Line Items]      
Loan commitment fee percentage 0.15%    
Shelf Notes [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing amount - credit facility $ 200,000,000    
Debt Instrument, Maturity Date Jan. 29, 2023    
Floating Rate Principal Maximum $ 100,000,000    
Series B maturing March 2023      
Line of Credit Facility [Line Items]      
Total debt, including current portion   $ 75,000,000  
Debt Instrument, Fee Amount 3,500,000    
Debt Instrument, Repurchased Face Amount 75,000,000    
Line of Credit | Committed Facility | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Maximum borrowing amount - credit facility 500,000,000    
Line of Credit Facility, Current Borrowing Capacity $ 250,000,000    
Line of Credit | Committed Facility | Revolving Credit Facility | Minimum      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate 0.00%    
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases $ 200,000,000    
Line of Credit | Committed Facility | Revolving Credit Facility | Maximum      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate 0.75%    
Line of Credit | Federal Funds Effective Swap Rate | Committed Facility      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate 0.50%    
Line of Credit | London Interbank Offered Rate (LIBOR) | Committed Facility      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate 1.50%    
Line of Credit | London Interbank Offered Rate (LIBOR) | Committed Facility | Revolving Credit Facility | Minimum      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate 1.00%    
Line of Credit | London Interbank Offered Rate (LIBOR) | Committed Facility | Revolving Credit Facility | Maximum      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate 1.75%