Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Revenue	$ 823,514	$ 1,045,040	$ 1,751,080	$ 2,078,040
Investment income	835	1,283	2,002	2,421
Costs and expenses:
Purchased transportation	635,133	799,371	1,344,390	1,591,126
Commissions to agents	75,266	87,623	150,642	173,294
Other operating costs, net of gains on asset sales/dispositions	7,368	9,861	15,674	18,100
Insurance and claims	19,751	16,286	44,708	31,279
Selling, general and administrative	40,601	41,297	85,928	82,565
Depreciation and amortization	11,467	11,034	22,972	22,350
Impairment of intangible and other assets	2,582		2,582
Total costs and expenses	792,168	965,472	1,666,896	1,918,714
Operating income	32,181	80,851	86,186	161,747
Interest and debt expense	976	709	1,928	1,514
Income before income taxes	31,205	80,142	84,258	160,233
Income taxes	6,951	19,042	19,109	35,833
Net income	24,254	61,100	65,149	124,400
Less: Net loss attributable to noncontrolling interest				(17)
Net income attributable to Landstar System, Inc. and subsidiary	$ 24,254	$ 61,100	$ 65,149	$ 124,417
Earnings per common share attributable to Landstar System, Inc. and subsidiary	$ 0.63	$ 1.53	$ 1.68	$ 3.11
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary	$ 0.63	$ 1.53	$ 1.68	$ 3.11
Average number of shares outstanding:
Earnings per common share	38,379,000	39,945,000	38,816,000	40,053,000
Diluted earnings per share	38,379,000	39,945,000	38,816,000	40,053,000
Dividends per common share	$ 0.185	$ 0.165	$ 0.370	$ 0.330