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QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2020 | Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Dec. 28, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 798,377 | $ 733,970 | $ 688,808 | $ 674,200 | $ 683,626 | $ 690,340 | $ 700,871 | $ 692,139 | $ 2,895,355 | $ 2,766,976 | $ 2,757,144
Gross profit | 204,581 | 190,747 | 183,937 | 186,249 | 166,591 | 173,287 | 178,176 | 164,627 | 765,514 | 682,681 | 668,172
Net earnings, amount | $ 35,815 | $ 39,342 | $ 22,607 | $ 42,929 | $ 32,540 | $ 38,045 | $ 39,719 | $ 36,104 | $ 140,693 | $ 146,408 | $ 101,770
Basic (in dollars per share) | $ 1.69 | $ 1.85 | $ 1.06 | $ 2.00 | $ 1.52 | $ 1.76 | $ 1.83 | $ 1.65 | $ 6.60 | $ 6.76 | $ 4.56
Diluted (in dollars per share) | 1.68 | 1.84 | 1.06 | 1.99 | 1.51 | 1.75 | 1.82 | 1.64 | 6.57 | 6.73 | $ 4.53
Stock Price, High (in dollars per share) | 176.62 | 134.58 | 128.37 | 154.86 | 151.46 | 146.46 | 136.75 | 139.50 | 176.62 | 151.46 |
Stock Price, Low (in dollars per share) | 119.88 | 108.15 | 98.93 | 82.60 | 123.80 | 123.74 | 112.94 | 107.43 | 82.60 | 107.43 |
Dividends Declared (in dollars per share) | $ 0.450 | $ 0.450 | $ 0.450 | $ 0.450 | $ 0.375 | $ 0.375 | $ 0.375 | $ 0.375 | $ 1.80 | $ 1.50 |
Impairment of goodwill and intangible assets |  |  | $ 16,220 |  |  |  |  |  | $ 16,638 | $ 0 | $ 15,780
Impairment of goodwill and intangible assets (in dollars per share) |  |  | $ 0.76 |  |  |  |  |  |  |  |
Restructuring charges | $ 11,041 | $ 2,133 | $ 4,019 |  |  |  |  |  | $ 23,149 |  |
Restructuring expenses (in dollars per share) | $ 0.52 | $ 0.10 | $ 0.19 |  |  |  |  |  |  |  |

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