Stock-Based Compensation (Tables)

12 Months Ended

Jan. 02, 2021

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Information for the Equity Awards Granted

The following table summarizes information for the equity awards granted in 2020:

	Options			Restricted Stock Units			Performance Stock Units			Warrants
		Weighted			Weighted			Weighted			Weighted
		average grant-		Number of	average grant-		Number of	average grant-			average grant-
	Number of	date fair value		restricted	date fair value		performance	date fair value		Number of	date fair value
	options	per unit		stock units	per unit		stock units	per unit		warrants	per unit
Beginning balance—December 28, 2019	2,128,107	$	9.08	1,556,636	$	20.29	390,645	$	31.08	100,037	$	18.00
Granted	—	—		1,379,943	18.10		199,946	23.43		—	—
Forfeited/ Canceled	(35,117)	12.30		(154,283)	19.12		(112,416)	26.54		—	—
Exercised	(54,517)	10.10		—	—		—	—		—	—
Vested	—	—		(647,345)	21.28		(49,300)	32		—	—
Balance—January 2, 2021	2,038,473	$	9.16	2,134,951	$	18.64	428,875	$	28.64	100,037	$	18.00

Summit Materials, LLC

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Information for the Equity Awards Granted

The following table summarizes information for the equity awards granted in 2020:

	Options			Restricted Stock Units			Performance Stock Units			Warrants
		Weighted			Weighted			Weighted			Weighted
		average grant-		Number of	average grant-		Number of	average grant-			average grant-
	Number of	date fair value		restricted	date fair value		performance	date fair value		Number of	date fair value
	options	per unit		stock units	per unit		stock units	per unit		warrants	per unit
Beginning balance—December 28, 2019	2,128,107	$	9.08	1,556,636	$	20.29	390,645	$	31.08	100,037	$	18.00
Granted	—	—		1,379,943	18.10		199,946	23.43		—	—
Forfeited/ Canceled	(35,117)	12.30		(154,283)	19.12		(112,416)	26.54		—	—
Exercised	(54,517)	10.10		—	—		—	—		—	—
Vested	—	—		(647,345)	21.28		(49,300)	32		—	—
Balance—January 2, 2021	2,038,473	$	9.16	2,134,951	$	18.64	428,875	$	28.64	100,037	$	18.00