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Change in Accounting Estimate for Self-Insured Claims (Tables)
 12 Months Ended
Dec. 28, 2019
Effect of Increase in Cost of Insurance and Claims
 
The following table summarizes the effect of the increase in the cost of insurance claims resulting from unfavorable development of prior year self-insured claims estimates on operating income, net income attributable to Landstar System, Inc. and subsidiary and earnings per share attributable to Landstar System, Inc. and subsidiary set forth in the consolidated statements of income for the fiscal years ended December 28, 2019, December 29, 2018 and December 30, 2017 (in thousands, except per share amounts):    
                         
 
Fiscal Years Ended
 
 
December 28,
2019
 
  
December 29,
2018
 
  
December 30,
2017
 
Operating income
  $
16,679
    $
13,960
    $
4,144
 
Net income attributable to Landstar System, Inc. and subsidiary
  $
12,683
    $
10,582
    $
2,578
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Earnings per share attributable to Landstar System, Inc. and subsidiary
  $
0.32
    $
0.26
    $
0.06
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary
  $
0.32
    $
0.26
    $
0.06