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Stock Plans (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 02, 2017
USD ($)
plan
$ / shares
shares
Apr. 03, 2016
USD ($)
$ / shares
shares
Jan. 01, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Former Stock-based Compensation Plans | plan 1    
Total income tax benefit recognized for stock-based compensation | $ $ 2,900 $ 1,900  
Stock-based compensation costs capitalized as part of inventory | $ 300    
Total pre-tax stock-based compensation expense | $ $ 4,926 $ 3,846  
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant-date fair value of options | $ / shares $ 11.72 $ 10.10  
Total intrinsic value of options exercised | $ $ 3,000 $ 1,700  
Cash received from option exercises | $ 4,600 1,200  
Total pre-tax stock-based compensation expense | $ 1,200 1,100  
Total unrecognized compensation cost, net of estimated forfeitures, related to nonvested stock, granted | $ $ 9,700    
Weighted-average period for recognition of unrecognized compensation cost, years 2 years 3 months    
Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total pre-tax stock-based compensation expense | $ $ 2,500 2,200  
Total unrecognized compensation cost, net of estimated forfeitures, related to nonvested stock, granted | $ $ 20,500    
Weighted-average period for recognition of unrecognized compensation cost, years 1 year 11 months 15 days    
Awards/units outstanding 544,000   521,000
Number of Shares, Granted 204,000    
Weighted-average grant-date fair value of stock granted (per share) | $ / shares $ 53.44    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 7,000    
Fair value of restricted stock awards vested | $ $ 7,800 6,900  
Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total pre-tax stock-based compensation expense | $ $ 1,100 $ 600  
Awards/units outstanding 179,620    
Number of Shares, Granted 49,845 77,453  
Weighted-average grant-date fair value of stock granted (per share) | $ / shares $ 52.69 $ 42.47  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0    
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent | $ $ 4,000    
Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Granted 0    
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized under plan 5,000,000    
Number of Shares, Granted 0    
Shares available for grant under employee stock purchase plan 900,000    
Performance Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total pre-tax stock-based compensation expense | $ $ 200    
Awards/units outstanding 54,337    
Number of Shares, Granted 54,337    
Weighted-average grant-date fair value of stock granted (per share) | $ / shares $ 52.78    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   0  
2009 Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized under plan 10,000,000