Consolidated Statements of Comprehensive Income - Summit Materials Inc - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 275,943	$ 154,281	$ 141,240
Other comprehensive income (loss):
Postretirement liability adjustment	6,481	1,303	(2,229)
Foreign currency translation adjustment	(11,831)	1,254	4,617
Less tax effect of other comprehensive (loss) income items	1,291	(615)	(575)
Other comprehensive income (loss)	(4,059)	1,942	1,813
Comprehensive income	271,884	156,223	143,053
Less comprehensive income attributable to Summit Holdings	3,738	2,159	3,331
Comprehensive income attributable to Summit LLC	$ 268,146	$ 154,064	$ 139,722

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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