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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 29, 2018
Summary of Activity in Allowance for Doubtful Accounts | Following is a summary of the activity in the allowance for doubtful accounts for fiscal years ending December 29, 2018, December 30, 2017 and December 31, 2016 (in thousands):
|  | Balance at Beginning of Period |  |  | Charged to Costs and Expenses |  |  | Write-offs, Net of Recoveries |  |  | Balance at End of Period |
For the Fiscal Year Ended December 29, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  | $ | 6,131 |  |  | $ | 3,886 |  |  | $ | (3,604 | ) |  | $ | 6,413 |
Other receivables |  |  | 6,952 |  |  |  | 3,520 |  |  |  | (3,261 | ) |  |  | 7,211 |
Other non-current receivables |  |  | 251 |  |  |  | 9 |  |  |  | (4 | ) |  |  | 256 |
|  | $ | 13,334 |  |  | $ | 7,415 |  |  | $ | (6,869 | ) |  | $ | 13,880 |
For the Fiscal Year Ended December 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  | $ | 5,161 |  |  | $ | 3,982 |  |  | $ | (3,012 | ) |  | $ | 6,131 |
Other receivables |  |  | 6,549 |  |  |  | 3,450 |  |  |  | (3,047 | ) |  |  | 6,952 |
Other non-current receivables |  |  | 244 |  |  |  | 7 |  |  |  | — |  |  |  | 251 |
|  | $ | 11,954 |  |  | $ | 7,439 |  |  | $ | (6,059 | ) |  | $ | 13,334 |
For the Fiscal Year Ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  | $ | 4,327 |  |  | $ | 2,772 |  |  | $ | (1,938 | ) |  | $ | 5,161 |
Other receivables |  |  | 5,555 |  |  |  | 2,963 |  |  |  | (1,969 | ) |  |  | 6,549 |
Other non-current receivables |  |  | 238 |  |  |  | — |  |  |  | 6 |  |  |  | 244 |
|  | $ | 10,120 |  |  | $ | 5,735 |  |  | $ | (3,901 | ) |  | $ | 11,954 |
Reconciliation of Average Number of Common Shares and Common Share Equivalents 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):
|  | Fiscal Years |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Average number of common shares outstanding |  |  | 41,273 |  |  |  | 41,938 |  |  |  | 42,112 |
Incremental shares from assumed exercises of stock options |  |  | 37 |  |  |  | 86 |  |  |  | 124 |
Average number of common shares and common share equivalents outstanding |  |  | 41,310 |  |  |  | 42,024 |  |  |  | 42,236 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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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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