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Quarterly Results (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Quarterly operating data (unaudited) |
| Fiscal 2018
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth 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 |
| Fiscal 2017
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Sales | $ | 2,156,259 |  |  | $ | 2,290,829 |  |  | $ | 2,339,830 |  |  | $ | 2,190,808 |
Gross profit | 1,131,147 |  |  | 1,200,062 |  |  | 1,230,294 |  |  | 1,159,180 |
Operating income | 403,157 |  |  | 457,445 |  |  | 461,963 |  |  | 402,835 |
Net income | 264,934 |  |  | 282,821 |  |  | 283,734 |  |  | 302,315 |
Earnings per share – basic (1) | $ | 2.88 |  |  | $ | 3.14 |  |  | $ | 3.26 |  |  | $ | 3.56 |
Earnings per share – assuming dilution (1) | $ | 2.83 |  |  | $ | 3.10 |  |  | $ | 3.22 |  |  | $ | 3.52 |
(1) | 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=109225645&loc=d3e1280-108306 + Details
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