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Stock Plans (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 02, 2017
USD ($)
$ / shares
shares
Jul. 03, 2016
USD ($)
$ / shares
Jul. 02, 2017
USD ($)
plan
$ / shares
shares
Jul. 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 | $ $ 5,100 $ 5,300 $ 8,000 $ 7,300  
Stock-based compensation costs capitalized as part of inventory | $     400 600  
Total pre-tax stock-based compensation expense | $ $ 6,841 $ 5,829 $ 11,767 $ 9,675  
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average grant-date fair value of options | $ / shares $ 13.27 $ 12.49 $ 11.74 $ 10.13  
Total intrinsic value of options exercised | $ $ 9,100 $ 10,300 $ 12,200 $ 11,900  
Cash received from option exercises | $     13,200 9,000  
Total pre-tax stock-based compensation expense | $ 1,200 1,200 2,400 2,300  
Total unrecognized compensation cost, net of estimated forfeitures, related to nonvested stock, granted | $ 8,400   $ 8,400    
Weighted-average period for recognition of unrecognized compensation cost, years     2 years 1 month    
Restricted Stock Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total pre-tax stock-based compensation expense | $ 3,000 2,800 $ 5,400 4,900  
Total unrecognized compensation cost, net of estimated forfeitures, related to nonvested stock, granted | $ $ 18,400   $ 18,400    
Weighted-average period for recognition of unrecognized compensation cost, years     1 year 9 months 12 days    
Awards/units outstanding | shares 519,000   519,000   521,000
Number of Shares, Granted | shares     217,000    
Weighted-average grant-date fair value of stock granted (per share) | $ / shares     $ 53.92    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares     15,000    
Fair value of restricted stock awards vested | $ $ 1,500 900 $ 9,300 7,800  
Performance Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total pre-tax stock-based compensation expense | $ $ 1,700 $ 1,100 $ 2,800 $ 1,700  
Awards/units outstanding | shares 179,620   179,620    
Number of Shares, Granted | shares     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 | shares     0    
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent | $ $ 5,700   $ 5,700    
Stock Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total pre-tax stock-based compensation expense | $     $ 700    
Number of Shares, Granted | shares     1,598 1,821  
Weighted-average grant-date fair value of stock granted (per share) | $ / shares     $ 62.56 $ 54.91  
Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized under plan | shares 5,000,000   5,000,000    
Number of Shares, Granted | shares     18,483 23,898  
Weighted-average grant-date fair value of stock granted (per share) | $ / shares     $ 64.73 $ 49.80  
Shares available for grant under employee stock purchase plan | shares 900,000   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   $ 500    
Awards/units outstanding | shares 54,337   54,337    
Number of Shares, Granted | shares     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 | shares       0  
2009 Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized under plan | shares 10,000,000   10,000,000