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Quarterly Results (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Data [Abstract] |
Quarterly operating data (unaudited) |
| 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 |
| Fiscal 2016
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Sales | $ | 2,096,150 |  |  | $ | 2,176,689 |  |  | $ | 2,220,955 |  |  | $ | 2,099,302 |
Gross profit | 1,097,579 |  |  | 1,127,179 |  |  | 1,170,026 |  |  | 1,114,227 |
Operating income | 418,626 |  |  | 425,061 |  |  | 447,809 |  |  | 407,710 |
Net income | 255,374 |  |  | 257,794 |  |  | 278,493 |  |  | 246,030 |
Earnings per share – basic (1) | $ | 2.63 |  |  | $ | 2.69 |  |  | $ | 2.93 |  |  | $ | 2.62 |
Earnings per share – assuming dilution (1) | $ | 2.59 |  |  | $ | 2.65 |  |  | $ | 2.90 |  |  | $ | 2.59 |
(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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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