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Stock Plans (Summary of Restricted Stock Award Activity) (Details) - Restricted Stock Awards [Member]
shares in Thousands
9 Months Ended
Oct. 04, 2020
$ / shares
shares
Restricted stock award activity  
Number of Shares, Nonvested at beginning of period | shares 345
Number of Shares, Granted | shares 182
Number of Shares, Vested | shares (190)
Number of Shares, Forfeited | shares (34)
Number of Shares, Nonvested at end of period | shares 303
Weighted-Average Grant-Date Fair Value, Nonvested at beginning of period | $ / shares $ 78.69
Weighted-Average Grant-Date Fair Value, Granted | $ / shares 84.39
Weighted-Average Grant-Date Fair Value, Vested | $ / shares 72.14
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares 85.10
Weighted-Average Grant-Date Fair Value, Nonvested at end of period | $ / shares $ 85.52