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Quarterly Results (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Results (Unaudited) |
Quarterly operating data (unaudited) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal 2019
​ |  | First |  | Second |  | Third |  | Fourth
​ | ​ | Quarter | ​ | Quarter | ​ | Quarter | ​ | Quarter
Sales | ​ | $ | 2,410,608 | ​ | $ | 2,589,874 | ​ | $ | 2,666,528 | ​ | $ | 2,482,975
Gross profit | ​ |  | 1,279,290 | ​ |  | 1,368,287 | ​ |  | 1,422,530 | ​ |  | 1,324,584
Operating income | ​ |  | 444,786 | ​ |  | 498,074 | ​ |  | 536,363 | ​ |  | 441,503
Net income | ​ |  | 321,152 | ​ |  | 353,681 | ​ |  | 391,293 | ​ |  | 324,916
Earnings per share – basic (1) | ​ | $ | 4.09 | ​ | $ | 4.56 | ​ | $ | 5.14 | ​ | $ | 4.29
Earnings per share – assuming dilution (1) | ​ | $ | 4.05 | ​ | $ | 4.51 | ​ | $ | 5.08 | ​ | $ | 4.25
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal 2018
​ |  | First |  | Second |  | Third |  | Fourth
​ | ​ | Quarter | ​ | Quarter | ​ | Quarter | ​ | Quarter
Sales | ​ | $ | 2,282,681 | ​ | $ | 2,456,073 | ​ | $ | 2,482,717 | ​ | $ | 2,314,957
Gross profit | ​ |  | 1,201,258 | ​ |  | 1,288,638 | ​ |  | 1,315,755 | ​ |  | 1,234,315
Operating income | ​ |  | 422,846 | ​ |  | 479,150 | ​ |  | 485,148 | ​ |  | 428,040
Net income | ​ |  | 304,906 | ​ |  | 353,073 | ​ |  | 366,151 | ​ |  | 300,357
Earnings per share – basic (1) | ​ | $ | 3.65 | ​ | $ | 4.32 | ​ | $ | 4.54 | ​ | $ | 3.76
Earnings per share – assuming dilution (1) | ​ | $ | 3.61 | ​ | $ | 4.28 | ​ | $ | 4.50 | ​ | $ | 3.72
Earnings per share amounts are computed independently for each quarter and annual period. The quarterly earnings per share amounts may not sum to equal the full-year earnings per share amount

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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