Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Comprehensive income (loss)
Net income	$ 92,769	$ 58,237	$ 104,930	$ 24,726
Other comprehensive income (loss):
Foreign currency translation adjustment	2,018	(1,328)	(3,395)	3,263
Income (loss) on cash flow hedges	0	155	0	(148)
Less tax effect of other comprehensive (loss) income items	(494)	284	831	(766)
Other comprehensive income (loss)	1,524	(889)	(2,564)	2,349
Comprehensive income	94,293	57,348	102,366	27,075
Less comprehensive income attributable to Summit Holdings	2,091	2,444	2,024	1,423
Comprehensive income attributable to Summit Inc.	92,202	54,904	100,342	25,652
Summit Materials, LLC
Comprehensive income (loss)
Net income	78,324	85,199	84,716	47,136
Other comprehensive income (loss):
Foreign currency translation adjustment	2,018	(1,328)	(3,395)	3,263
Income (loss) on cash flow hedges	0	155	0	(148)
Other comprehensive income (loss)	2,018	(1,173)	(3,395)	3,115
Comprehensive income attributable to Summit Inc.	$ 80,342	$ 84,026	$ 81,321	$ 50,251