Unaudited Consolidated Statements of Comprehensive Income - Summit Materials Inc - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Comprehensive income (loss)
Net loss	$ (67,270)	$ (31,212)
Other comprehensive income (loss):
Foreign currency translation adjustment	(4,724)	203
Less tax effect of other comprehensive income (loss) items	1,139	(39)
Other comprehensive (loss) income	(3,585)	164
Comprehensive loss	(70,855)	(31,048)
Less comprehensive loss attributable to Summit Holdings	(404)	(405)
Comprehensive loss attributable to Summit Inc.	$ (70,451)	$ (30,643)