Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Revenue	$ 1,085,546	$ 1,011,658	$ 2,836,626	$ 3,089,698
Investment income	714	1,315	2,716	3,736
Costs and expenses:
Purchased transportation	838,753	774,520	2,183,143	2,365,646
Commissions to agents	85,848	84,568	236,490	257,862
Other operating costs, net of gains/losses on asset sales/dispositions	7,361	10,431	23,035	28,531
Insurance and claims	21,855	23,969	66,563	55,248
Selling, general and administrative	38,851	38,152	124,779	120,717
Depreciation and amortization	11,240	10,695	34,212	33,045
Impairment of intangible and other assets			2,582
Total costs and expenses	1,003,908	942,335	2,670,804	2,861,049
Operating income	82,352	70,638	168,538	232,385
Interest and debt expense	1,008	764	2,936	2,278
Income before income taxes	81,344	69,874	165,602	230,107
Income taxes	19,458	16,619	38,567	52,452
Net income	61,886	53,255	127,035	177,655
Less: Net loss attributable to noncontrolling interest				(17)
Net income attributable to Landstar System, Inc. and subsidiary	$ 61,886	$ 53,255	$ 127,035	$ 177,672
Earnings per common share attributable to Landstar System, Inc. and subsidiary	$ 1.61	$ 1.35	$ 3.28	$ 4.45
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary	$ 1.61	$ 1.35	$ 3.28	$ 4.45
Average number of shares outstanding:
Earnings per common share	38,386,000	39,566,000	38,673,000	39,891,000
Diluted earnings per share	38,386,000	39,566,000	38,673,000	39,891,000
Dividends per common share	$ 0.210	$ 0.185	$ 0.580	$ 0.515