Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Results (Summary Of Quarterly Financial Information) (Details)

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Quarterly Financial Results (Summary Of Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 29, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Quarterly Financial Results [Abstract]                      
Net sales $ 299,023 $ 296,767 $ 301,460 $ 291,998 $ 273,114 $ 261,765 $ 257,063 $ 255,323 $ 1,189,248 $ 1,047,265 $ 1,006,083
Gross profit 249,556 244,890 251,469 242,623 227,401 214,630 213,161 212,669 988,538 867,861 825,893
Net earnings $ 32,331 $ 31,040 $ 33,907 $ 28,946 $ (5,851) $ 23,769 $ 23,259 $ 21,358 $ 126,224 $ 62,535 $ 100,041
Basic $ 1.35 $ 1.28 $ 1.40 $ 1.20 $ (0.24) $ 0.98 $ 0.95 $ 0.87 $ 5.24 $ 2.57 $ 4.14
Diluted $ 1.32 $ 1.24 $ 1.36 $ 1.19 $ (0.24) $ 0.97 $ 0.93 $ 0.86 $ 5.12 $ 2.53 $ 3.99