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Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Quarterly Financial Data (Unaudited) The company operates on a quarterly calendar that closes on the Saturday closest to the end of the calendar quarter. A summary of the company's consolidated quarterly results of operations is as follows:
|  | First Quarter |  | Second Quarter (b) |  | Third Quarter |  | Fourth Quarter (c) |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 5,759,552 |  |  | $ | 6,465,346 |  |  | $ | 6,953,740 |  |  | $ | 7,633,870 |  |
Gross profit |  |  | 759,887 |  |  |  | 823,966 |  |  |  | 843,358 |  |  |  | 930,128 |  |
Operating income |  |  | 191,722 |  |  |  | 229,822 |  |  |  | 235,992 |  |  |  | 270,914 |  |
Net income attributable to shareholders |  |  | 113,768 |  |  |  | 99,679 |  |  |  | 134,630 |  |  |  | 53,885 |  |
Net income per share (a): |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.27 |  |  | $ | 1.12 |  |  | $ | 1.52 |  |  | $ | 0.61 |  |
Diluted |  | $ | 1.26 |  |  | $ | 1.11 |  |  | $ | 1.50 |  |  | $ | 0.60 |  |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 5,474,177 |  |  | $ | 5,972,101 |  |  | $ | 5,936,092 |  |  | $ | 6,442,891 |  |
Gross profit |  |  | 748,898 |  |  |  | 798,791 |  |  |  | 773,162 |  |  |  | 823,348 |  |
Operating income |  |  | 181,364 |  |  |  | 223,592 |  |  |  | 198,684 |  |  |  | 254,899 |  |
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 |  |
(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.
(b) | Net income attributable to shareholders includes a loss on extinguishment of debt of $58.8 million during the second quarter of 2017
(c) | Net income attributable to shareholders includes a U.S. Tax Act expense of $124.7 million during the fourth quarter of 2017.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: 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=68064558&loc=d3e765-108305 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=68064558&loc=d3e725-108305 + Details
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