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Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data [Text Block] | Quarterly Financial Data (Unaudited) The company operates on a quarterly calendar that closes on the Saturday closest to the end of the calendar quarter, except for the third quarter of 2015, which closed on September 26, 2015. A summary of the company's consolidated quarterly results of operations is as follows:
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 5,474,177 |  |  | $ | 5,972,101 |  |  | $ | 5,936,092 |  |  | $ | 6,442,891 |  |
Gross profit |  |  | 748,898 |  |  |  | 798,791 |  |  |  | 773,162 |  |  |  | 823,348 |  |
Net income attributable to shareholders |  |  | 106,235 |  |  |  | 134,270 |  |  |  | 117,727 |  |  |  | 164,518 |  |
Net income per share (a): |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.16 |  |  | $ | 1.46 |  |  | $ | 1.29 |  |  | $ | 1.84 |  |
Diluted |  | $ | 1.14 |  |  | $ | 1.45 |  |  | $ | 1.28 |  |  | $ | 1.81 |  |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 5,002,385 |  |  | $ | 5,829,989 |  |  | $ | 5,698,304 |  |  | $ | 6,751,342 |  |
Gross profit |  |  | 685,322 |  |  |  | 768,595 |  |  |  | 742,367 |  |  |  | 838,966 |  |
Net income attributable to shareholders |  |  | 106,058 |  |  |  | 123,932 |  |  |  | 109,244 |  |  |  | 158,492 |  |
Net income per share (a): |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.11 |  |  | $ | 1.30 |  |  | $ | 1.16 |  |  | $ | 1.71 |  |
Diluted |  | $ | 1.09 |  |  | $ | 1.28 |  |  | $ | 1.15 |  |  | $ | 1.69 |  |
(a) | 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.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: 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=51825399&loc=d3e1280-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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