Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Net income attributable to Landstar System, Inc. and subsidiary	$ 381,524	$ 192,106	$ 227,720
Other comprehensive (loss) income:
Unrealized holding (losses) gains on available-for-sale investments, net of tax (benefit) expense of ($739), $463, $561	(2,695)	1,688	2,050
Foreign currency translation (losses) gains	(709)	(1,475)	1,613
Other comprehensive (loss) income	(3,404)	213	3,663
Comprehensive income attributable to Landstar System, Inc. and subsidiary	$ 378,120	$ 192,319	$ 231,383