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Quarterly Financial Data Quarterly Financial Information Table (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | $ 7,918,182 |  | $ 7,490,445 |  | $ 7,392,528 |  | $ 6,875,613 |  | $ 7,539,449 |  | $ 6,856,108 |  | $ 6,422,226 |  | $ 5,736,780 |  | $ 29,676,768 | [1] | $ 26,554,563 | [1] | $ 23,487,872 | [1]
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | 58,800 |  |  |  | 0 |  | 59,545 |  | 0 |
Impact of changes in tax legislation | (28,300) |  |  |  |  |  |  |  | 124,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit | 975,370 |  | 923,778 |  | 932,820 |  | 868,944 |  | 929,180 |  | 842,567 |  | 824,024 |  | 761,197 |  | 3,700,912 |  | 3,356,968 |  | 3,144,322 |
Operating income | 334,380 |  | 290,310 |  | 286,827 |  | 235,995 |  | 286,824 |  | 235,441 |  | 230,446 |  | 193,025 |  | 1,147,512 |  | 945,736 |  | 876,826 |
Net income attributable to shareholders | $ 230,653 | [2] | $ 176,533 |  | $ 169,915 |  | $ 139,094 |  | $ 53,653 | [2] | $ 134,064 |  | $ 99,722 | [3] | $ 114,737 |  | $ 716,195 |  | $ 402,176 |  | $ 522,815 |
Basic | $ 2.66 | [4] | $ 2.02 | [4] | $ 1.94 | [4] | $ 1.58 | [4] | $ 0.61 | [4] | $ 1.52 | [4] | $ 1.12 | [4] | $ 1.29 | [4] | $ 8.19 |  | $ 4.54 |  | $ 5.75 |
Diluted | $ 2.63 | [4] | $ 1.99 | [4] | $ 1.92 | [4] | $ 1.56 | [4] | $ 0.60 | [4] | $ 1.50 | [4] | $ 1.11 | [4] | $ 1.27 | [4] | $ 8.10 | [5] | $ 4.48 | [5] | $ 5.68 | [5]
[1] | Includes sales related to the United States of $12,157,306, $11,038,930, and $10,137,041 for 2018, 2017, and 2016, respectively.
[2] | Net income attributable to shareholders includes a U.S. Tax Act benefit of $28.3 million and expense of $124.7 million during the fourth quarter of 2018 and 2017, respectively.
[3] | Net income attributable to shareholders includes a loss on extinguishment of debt of $58.8 million during the second quarter of 2017.
[4] | Quarterly net income per share is calculated using the weighted-average shares outstanding during each quarterly period, while net income per share for the full year is calculated using the weighted-average shares outstanding during the year. Therefore, the sum of the net income per share for each of the four quarters may not equal the net income per share for the full year.
[5] | Stock-based compensation awards for the issuance of 651 shares, 380 shares, and 766 shares for the years ended December 31, 2018, 2017, and 2016, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.

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