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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 28, 2019
Earnings Per Share [Abstract] |
Reconciliation of Average Number of Common Shares Outstanding to Average Number of Diluted Shares Outstanding | The following table provides a reconciliation of the average number of common shares outstanding used to calculate earnings per common share attributable to Landstar System, Inc. and subsidiary to the average number of common shares and common share equivalents outstanding used to calculate diluted earnings per share attributable to Landstar System, Inc. and subsidiary (in thousands):
|  | Thirty Nine Weeks Ended |  |  | Thirteen Weeks Ended |
|  | September 28, 2019 |  |  | September 29, 2018 |  |  | September 28, 2019 |  |  | September 29, 2018 |
Average number of common shares outstanding |  |  | 39,891 |  |  |  | 41,530 |  |  |  | 39,566 |  |  |  | 41,101 |
Incremental shares from assumed exercises of stock options |  |  | — |  |  |  | 46 |  |  |  | — |  |  |  | 36 |
Average number of common shares and common share equivalents outstanding |  |  | 39,891 |  |  |  | 41,576 |  |  |  | 39,566 |  |  |  | 41,137 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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