Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Revenue	$ 6,537,568	$ 4,132,981	$ 4,084,577
Investment income	2,857	3,399	5,041
Costs and expenses:
Purchased transportation	5,114,667	3,192,850	3,127,474
Commissions to agents	507,209	340,780	342,226
Other operating costs, net of gains on asset sales/dispositions	36,531	30,463	37,274
Insurance and claims	105,463	87,773	80,319
Selling, general and administrative	221,278	167,633	158,953
Depreciation and amortization	49,609	45,855	44,468
Impairment of intangible and other assets	0	2,582	0
Commission program termination costs	0	15,494	0
Total costs and expenses	6,034,757	3,883,430	3,790,714
Operating income	505,668	252,950	298,904
Interest and debt expense	3,976	3,953	3,141
Income before income taxes	501,692	248,997	295,763
Income taxes	120,168	56,891	68,060
Net income	381,524	192,106	227,703
Less: Net loss attributable to noncontrolling interest	0	0	(17)
Net income attributable to Landstar System, Inc. and subsidiary	$ 381,524	$ 192,106	$ 227,720
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary	$ 9.98	$ 4.98	$ 5.72
Average diluted shares outstanding	38,235,000	38,602,000	39,786,000
Dividends per common share	$ 2.92	$ 2.79	$ 2.70