STOCKHOLDERS' EQUITY/MEMBERS' INTEREST

9 Months Ended

Oct. 02, 2021

Schedule of Capitalization, Equity [Line Items]

STOCKHOLDERS' EQUITY

STOCKHOLDERS’ EQUITY

During the nine months ended October 2, 2021 and September 26, 2020, certain limited partners of Summit Holdings exchanged their LP Units for shares of Class A common stock of Summit Inc. The following table summarizes the changes in our ownership of Summit Holdings:

	Summit Inc. Shares (Class A)	LP Units	Total	Summit Inc. Ownership Percentage
Balance — January 2, 2021	114,390,595	2,873,170	117,263,765	97.5	%
Exchanges during period	1,440,983	(1,440,983)	—
Stock option exercises	1,744,256	—	1,744,256
Other equity transactions	989,116	—	989,116
Balance — October 2, 2021	118,564,950	1,432,187	119,997,137	98.8	%
Balance — December 28, 2019	113,309,385	3,249,657	116,559,042	97.2	%
Exchanges during period	196,542	(196,542)	—
Stock option exercises	14,404	—	14,404
Other equity transactions	603,580	—	603,580
Balance — September 26, 2020	114,123,911	3,053,115	117,177,026	97.4	%

Summit Inc. is Summit Holdings’ primary beneficiary and thus consolidates Summit Holdings in its consolidated financial statements with a corresponding noncontrolling interest reclassification, which was 1.2% and 2.5% as of October 2, 2021 and January 2, 2021, respectively.

Accumulated other comprehensive income (loss) —The changes in each component of accumulated other comprehensive income (loss) consisted of the following:

	Change in  retirement plans		Foreign currency  translation  adjustments		Accumulated  other  comprehensive  income (loss)
Balance — January 2, 2021	$	533	$	4,670	$	5,203
Foreign currency translation adjustment, net of tax	—		467		467
Balance — October 2, 2021	$	533	$	5,137	$	5,670
Balance — December 28, 2019	$	2,171	$	1,277	$	3,448
Foreign currency translation adjustment, net of tax	—		(2,473)		(2,473)
Balance — September 26, 2020	$	2,171	$	(1,196)	$	975

Summit Materials, LLC

Schedule of Capitalization, Equity [Line Items]

MEMBERS' INTEREST

MEMBERS’ INTEREST

Accumulated other comprehensive income (loss) —The changes in each component of accumulated other comprehensive income (loss) consisted of the following:

							Accumulated
			Foreign currency				other
	Change in		translation		Cash flow hedge		comprehensive
	retirement plans		adjustments		adjustments		(loss) income
Balance — January 2, 2021	$	(8,546)	$	(10,037)	$	—	$	(18,583)
Foreign currency translation adjustment	—		682		—		682
Balance — October 2, 2021	$	(8,546)	$	(9,355)	$	—	$	(17,901)
Balance — December 28, 2019	$	(6,317)	$	(14,654)	$	—	$	(20,971)
Foreign currency translation adjustment	—		(3,395)		—		(3,395)
Balance — September 26, 2020	$	(6,317)	$	(18,049)	$	—	$	(24,366)