Unaudited Consolidated Statements of Comprehensive Income - Summit Materials LLC - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Net loss	$ (67,270)	$ (31,212)
Other comprehensive income (loss):
Foreign currency translation adjustment	(4,724)	203
Comprehensive loss attributable to Summit Inc.	(70,451)	(30,643)
Summit Materials, LLC
Net loss	(78,330)	(37,211)
Other comprehensive income (loss):
Foreign currency translation adjustment	(4,724)	203
Comprehensive loss attributable to Summit Inc.	$ (83,054)	$ (37,008)