Summit Materials (SUM) 10-Q 2 Nov 23 2023 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2023	Oct. 31, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-36873
Entity Registrant Name	SUMMIT MATERIALS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-1984212
Entity Address, Address Line One	1801 California Street
Entity Address, Address Line Two	Suite 3500
Entity Address, City or Town	Denver
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80202
City Area Code	303
Local Phone Number	893-0012
Title of 12(b) Security	Class A Common Stock (par value $.01 per share)
Trading Symbol	SUM
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001621563
Amendment Flag	false
Current Fiscal Year End Date	--12-30
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		119,460,587
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		99
Summit Materials, LLC
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	333-187556
Entity Registrant Name	SUMMIT MATERIALS, LLC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-4138486
Entity Address, Address Line One	1801 California Street
Entity Address, Address Line Two	Suite 3500
Entity Address, City or Town	Denver
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80202
City Area Code	303
Local Phone Number	893-0012
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001571371
Amendment Flag	false
Current Fiscal Year End Date	--12-30
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3

Consolidated Balance Sheets - S

Consolidated Balance Sheets - Summit Materials Inc - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 197,475	$ 520,451
Accounts receivable, net	375,929	256,669
Costs and estimated earnings in excess of billings	40,985	6,510
Inventories	243,136	212,491
Other current assets	17,976	20,787
Current assets held for sale	1,702	1,468
Total current assets	877,203	1,018,376
Property, plant and equipment, less accumulated depreciation, depletion and amortization (September 30, 2023 - $1,387,348 and December 31, 2022 - $1,267,557)	1,974,532	1,813,702
Goodwill	1,241,472	1,132,546
Intangible assets, less accumulated amortization (September 30, 2023 - $18,115 and December 31, 2022 - $15,503)	68,814	71,384
Deferred tax assets, less valuation allowance (September 30, 2023 - $1,113 and December 31, 2022 - $1,113)	113,362	136,986
Operating lease right-of-use assets	38,380	37,889
Other assets	51,201	44,809
Total assets	4,364,964	4,255,692
Current liabilities:
Current portion of debt	3,822	5,096
Current portion of acquisition-related liabilities	7,028	13,718
Accounts payable	173,127	104,031
Accrued expenses	147,619	119,967
Current operating lease liabilities	8,745	7,296
Billings in excess of costs and estimated earnings	8,539	5,739
Total current liabilities	348,880	255,847
Long-term debt	1,488,069	1,488,569
Acquisition-related liabilities	27,633	29,051
Tax receivable agreement liability	52,143	327,812
Noncurrent operating lease liabilities	34,838	35,737
Other noncurrent liabilities	105,668	106,686
Total liabilities	2,057,231	2,243,702
Commitments and contingencies (see note 12)
Stockholders’ equity:
Additional paid-in capital	1,415,320	1,404,122
Accumulated earnings	873,773	590,895
Accumulated other comprehensive income	3,296	3,084
Stockholders’ equity	2,293,581	1,999,286
Noncontrolling interest in Summit Holdings	14,152	12,704
Total stockholders’ equity	2,307,733	2,011,990
Total liabilities and members' interest	4,364,964	4,255,692
Common Class A
Stockholders’ equity:
Common stock	1,192	1,185
Common Class B
Stockholders’ equity:
Common stock	$ 0	$ 0

Consolidated Balance Sheets -_2

Consolidated Balance Sheets - Summit Materials Inc (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accumulated depreciation, depletion and amortization	$ 1,387,348	$ 1,267,557
Accumulated amortization	18,115	15,503
Valuation allowance	$ 1,113	$ 1,113
Common Class A
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	119,112,950	118,408,655
Common stock, shares outstanding (in shares)	119,112,950	118,408,655
Common Class B
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	99	99
Common stock, shares outstanding (in shares)	99	99

Consolidated Balance Sheets -_3

Consolidated Balance Sheets - Summit Materials LLC - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 197,475	$ 520,451
Accounts receivable, net	375,929	256,669
Cost and estimated earnings in excess of billings	40,985	6,510
Inventories	243,136	212,491
Other current assets	17,976	20,787
Current assets held for sale	1,702	1,468
Total current assets	877,203	1,018,376
Property, plant and equipment, less accumulated depreciation, depletion and amortization (September 30, 2023 - $1,387,348 and December 31, 2022 - $1,267,557)	1,974,532	1,813,702
Goodwill	1,241,472	1,132,546
Intangible assets, less accumulated amortization (September 30, 2023 - $18,115 and December 31, 2022 - $15,503)	68,814	71,384
Operating lease right-of-use assets	38,380	37,889
Other assets	51,201	44,809
Total assets	4,364,964	4,255,692
Current liabilities:
Current portion of debt	3,822	5,096
Current portion of acquisition-related liabilities	7,028	13,718
Accounts payable	173,127	104,031
Accrued expenses	147,619	119,967
Current operating lease liabilities	8,745	7,296
Billings in excess of costs and estimated earnings	8,539	5,739
Total current liabilities	348,880	255,847
Long-term debt	1,488,069	1,488,569
Acquisition-related liabilities	27,633	29,051
Noncurrent operating lease liabilities	34,838	35,737
Other noncurrent liabilities	105,668	106,686
Total liabilities	2,057,231	2,243,702
Commitments and contingencies (see note 11)
Stockholders’ equity:
Accumulated earnings	873,773	590,895
Accumulated other comprehensive loss	3,296	3,084
Total liabilities and members' interest	4,364,964	4,255,692
Summit Materials, LLC
Current assets:
Cash and cash equivalents	192,996	520,451
Accounts receivable, net	375,929	256,669
Cost and estimated earnings in excess of billings	40,985	6,510
Inventories	243,136	212,491
Other current assets	17,976	20,787
Current assets held for sale	1,702	1,468
Current portion of tax receivable agreement interests	4,400	0
Total current assets	877,124	1,018,376
Property, plant and equipment, less accumulated depreciation, depletion and amortization (September 30, 2023 - $1,387,348 and December 31, 2022 - $1,267,557)	1,974,532	1,813,702
Goodwill	1,242,472	1,133,546
Intangible assets, less accumulated amortization (September 30, 2023 - $18,115 and December 31, 2022 - $15,503)	68,814	71,384
Operating lease right-of-use assets	38,380	37,889
Other assets	51,201	44,809
Tax receivable agreement interest, net of current portion	118,535	0
Total assets	4,371,058	4,119,706
Current liabilities:
Current portion of debt	3,822	5,096
Current portion of acquisition-related liabilities	7,028	13,718
Accounts payable	172,982	104,430
Accrued expenses	148,105	120,708
Current operating lease liabilities	8,745	7,296
Billings in excess of costs and estimated earnings	8,539	5,739
Total current liabilities	349,221	256,987
Long-term debt	1,488,069	1,488,569
Acquisition-related liabilities	27,633	29,051
Noncurrent operating lease liabilities	34,838	35,737
Other noncurrent liabilities	165,195	166,212
Total liabilities	2,064,956	1,976,556
Commitments and contingencies (see note 11)
Stockholders’ equity:
Members' equity	1,429,956	1,425,278
Accumulated earnings	897,227	739,248
Accumulated other comprehensive loss	(21,081)	(21,376)
Total members' interest	2,306,102	2,143,150
Total liabilities and members' interest	$ 4,371,058	$ 4,119,706

Unaudited Consolidated Statemen

Unaudited Consolidated Statements of Operations - Summit Materials Inc - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Revenue:
Total revenue	$ 794,797	$ 752,747	$ 1,959,335	$ 1,860,248
Cost of revenue (excluding items shown separately below):
Total cost of revenue	543,159	534,936	1,389,599	1,372,521
General and administrative expenses	50,895	39,232	150,731	136,897
Depreciation, depletion, amortization and accretion	57,452	52,133	163,133	150,483
Transaction costs	17,442	727	19,518	2,637
Gain on sale of property, plant and equipment	(2,134)	(1,343)	(5,787)	(6,293)
Operating income	127,983	127,062	242,141	204,003
Interest expense	28,013	21,980	83,335	62,728
Loss on debt financings	0	0	493	0
Tax receivable agreement (benefit) expense	(153,080)	0	(153,080)	954
Gain on sale of businesses	0	(4,115)	0	(174,373)
Other income, net	(3,583)	(3,283)	(14,771)	(4,956)
Income from operations before taxes	256,633	112,480	326,164	319,650
Income tax expense	23,908	24,829	39,923	74,033
Net income	232,725	87,651	286,241	245,617
Net income attributable to noncontrolling interest in Summit Holdings	2,680	1,162	3,363	3,307
Net income attributable to Summit Inc.	$ 230,045	$ 86,489	$ 282,878	$ 242,310
Common Class A
Earnings per share of Class A common stock:
Basic (in usd per share)	$ 1.93	$ 0.72	$ 2.38	$ 2.01
Diluted (in usd per share)	$ 1.92	$ 0.72	$ 2.37	$ 2
Weighted average shares of Class A common stock:
Basic (in shares)	118,928,799	119,753,806	118,780,523	120,196,211
Diluted (in shares)	119,725,693	120,383,312	119,558,974	121,078,150
Common Class A And Restricted Stock
Earnings per share of Class A common stock:
Basic (in usd per share)	$ 1.93	$ 0.72	$ 2.38	$ 2.01
Weighted average shares of Class A common stock:
Basic (in shares)	119,013,331	119,896,272	118,874,967	120,345,015
Excluding delivery and subcontract revenue
Revenue:
Total revenue	$ 741,960	$ 686,009	$ 1,829,603	$ 1,710,422
Cost of revenue (excluding items shown separately below):
Total cost of revenue	490,322	468,198	1,259,867	1,222,695
Product
Revenue:
Total revenue	641,778	587,138	1,609,664	1,485,746
Cost of revenue (excluding items shown separately below):
Total cost of revenue	412,784	392,187	1,086,299	1,042,888
Service
Revenue:
Total revenue	100,182	98,871	219,939	224,676
Cost of revenue (excluding items shown separately below):
Total cost of revenue	77,538	76,011	173,568	179,807
Delivery and subcontract revenue
Revenue:
Total revenue	52,837	66,738	129,732	149,826
Cost of revenue (excluding items shown separately below):
Total cost of revenue	$ 52,837	$ 66,738	$ 129,732	$ 149,826

Unaudited Consolidated Statem_2

Unaudited Consolidated Statements of Operations - Summit Materials LLC - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Revenue:
Total revenue	$ 794,797	$ 752,747	$ 1,959,335	$ 1,860,248
Cost of revenue (excluding items shown separately below):
Total cost of revenue	543,159	534,936	1,389,599	1,372,521
General and administrative expenses	50,895	39,232	150,731	136,897
Depreciation, depletion, amortization and accretion	57,452	52,133	163,133	150,483
Transaction costs	17,442	727	19,518	2,637
Gain on sale of property, plant and equipment	(2,134)	(1,343)	(5,787)	(6,293)
Operating income	127,983	127,062	242,141	204,003
Interest expense	28,013	21,980	83,335	62,728
Loss on debt financings	0	0	493	0
Gain on sale of businesses	0	(4,115)	0	(174,373)
Other income, net	(3,583)	(3,283)	(14,771)	(4,956)
Income from operations before taxes	256,633	112,480	326,164	319,650
Income tax expense	23,908	24,829	39,923	74,033
Net income attributable to Summit Inc.	230,045	86,489	282,878	242,310
Summit Materials, LLC
Revenue:
Total revenue	794,797	752,747	1,959,335	1,860,248
Cost of revenue (excluding items shown separately below):
Total cost of revenue	543,159	534,936	1,389,599	1,372,521
General and administrative expenses	50,895	39,232	150,731	136,897
Depreciation, depletion, amortization and accretion	57,452	52,133	163,133	150,483
Transaction costs	17,442	727	19,518	2,637
Gain on sale of property, plant and equipment	(2,134)	(1,343)	(5,787)	(6,293)
Operating income	127,983	127,062	242,141	204,003
Interest expense	28,013	21,980	83,335	62,728
Loss on debt financings	0	0	493	0
Gain on sale of businesses	0	(4,115)	0	(174,373)
Other income, net	(3,581)	(3,283)	(14,769)	(4,956)
Income from operations before taxes	103,551	112,480	173,082	320,604
Income tax expense	8,451	7,147	15,103	19,557
Net income attributable to Summit Inc.	95,100	105,333	157,979	301,047
Excluding delivery and subcontract revenue
Revenue:
Total revenue	741,960	686,009	1,829,603	1,710,422
Cost of revenue (excluding items shown separately below):
Total cost of revenue	490,322	468,198	1,259,867	1,222,695
Excluding delivery and subcontract revenue | Summit Materials, LLC
Revenue:
Total revenue	741,960	686,009	1,829,603	1,710,422
Cost of revenue (excluding items shown separately below):
Total cost of revenue	490,322	468,198	1,259,867	1,222,695
Product
Revenue:
Total revenue	641,778	587,138	1,609,664	1,485,746
Cost of revenue (excluding items shown separately below):
Total cost of revenue	412,784	392,187	1,086,299	1,042,888
Product | Summit Materials, LLC
Revenue:
Total revenue	641,778	587,138	1,609,664	1,485,746
Cost of revenue (excluding items shown separately below):
Total cost of revenue	412,784	392,187	1,086,299	1,042,888
Service
Revenue:
Total revenue	100,182	98,871	219,939	224,676
Cost of revenue (excluding items shown separately below):
Total cost of revenue	77,538	76,011	173,568	179,807
Service | Summit Materials, LLC
Revenue:
Total revenue	100,182	98,871	219,939	224,676
Cost of revenue (excluding items shown separately below):
Total cost of revenue	77,538	76,011	173,568	179,807
Delivery and subcontract revenue
Revenue:
Total revenue	52,837	66,738	129,732	149,826
Cost of revenue (excluding items shown separately below):
Total cost of revenue	52,837	66,738	129,732	149,826
Delivery and subcontract revenue | Summit Materials, LLC
Revenue:
Total revenue	52,837	66,738	129,732	149,826
Cost of revenue (excluding items shown separately below):
Total cost of revenue	$ 52,837	$ 66,738	$ 129,732	$ 149,826

Unaudited Consolidated Statem_3

Unaudited Consolidated Statements of Comprehensive Income - Summit Materials Inc - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Comprehensive income (loss)
Net income	$ 232,725	$ 87,651	$ 286,241	$ 245,617
Other comprehensive income (loss):
Foreign currency translation adjustment	(3,810)	(10,247)	295	(14,113)
Less tax effect of other comprehensive income (loss) items	738	2,470	(80)	3,404
Other comprehensive (loss) income	(3,072)	(7,777)	215	(10,709)
Comprehensive income	229,653	79,874	286,456	234,908
Less comprehensive income attributable to Summit Holdings	2,638	1,048	3,366	3,151
Comprehensive income attributable to Summit Inc.	$ 227,015	$ 78,826	$ 283,090	$ 231,757

Unaudited Consolidated Statem_4

Unaudited Consolidated Statements of Comprehensive Income - Summit Materials LLC - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Net income	$ 232,725	$ 87,651	$ 286,241	$ 245,617
Other comprehensive income (loss):
Foreign currency translation adjustment	(3,810)	(10,247)	295	(14,113)
Comprehensive income attributable to Summit Inc.	227,015	78,826	283,090	231,757
Summit Materials, LLC
Net income	95,100	105,333	157,979	301,047
Other comprehensive income (loss):
Foreign currency translation adjustment	(3,810)	(10,247)	295	(14,113)
Comprehensive income attributable to Summit Inc.	$ 91,290	$ 95,086	$ 158,274	$ 286,934

Unaudited Consolidated Statem_5

Unaudited Consolidated Statements of Cash Flows - Summit Materials Inc - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022
Cash flows from operating activities:
Net income	$ 286,241	$ 245,617
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	168,758	160,162
Share-based compensation expense	15,116	15,058
Net gain on asset and business disposals	(5,790)	(180,240)
Non-cash loss on debt financings	161	0
Change in deferred tax asset, net	23,540	58,318
Other	(105)	(396)
Decrease (increase) in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	(107,349)	(96,724)
Inventories	(23,935)	(53,762)
Costs and estimated earnings in excess of billings	(34,463)	(32,042)
Other current assets	4,438	(6,961)
Other assets	2,208	3,432
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	48,524	44,510
Accrued expenses	19,034	(21,780)
Billings in excess of costs and estimated earnings	2,812	646
Tax receivable agreement benefit	(153,080)	954
Other liabilities	(2,486)	(4,601)
Net cash provided by operating activities	243,624	132,191
Cash flows from investing activities:
Acquisitions, net of cash acquired	(239,508)	(1,933)
Purchases of property, plant and equipment	(182,182)	(189,008)
Proceeds from the sale of property, plant and equipment	9,760	8,298
Proceeds from sale of businesses	0	373,790
Other	(3,602)	(2,214)
Net cash (used in) provided by investing activities	(415,532)	188,933
Cash flows from financing activities:
Debt issuance costs	(1,566)	0
Payments on debt	(8,520)	(113,769)
Cash paid for tax receivable agreement interests	(122,935)	0
Payments on acquisition-related liabilities	(12,203)	(12,964)
Distributions from partnership	(60)	(399)
Repurchases of common stock	0	(100,980)
Proceeds from stock option exercises	112	199
Other	(6,011)	(774)
Net cash used in financing activities	(151,183)	(228,687)
Impact of foreign currency on cash	115	(1,732)
Net (decrease) increase in cash	(322,976)	90,705
Cash and cash equivalents – beginning of period	520,451	380,961
Cash and cash equivalents – end of period	$ 197,475	$ 471,666

Unaudited Consolidated Statem_6

Unaudited Consolidated Statements of Cash Flows - Summit Materials LLC - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022
Cash flows from operating activities:
Net income	$ 286,241	$ 245,617
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	168,758	160,162
Share-based compensation expense	15,116	15,058
Net gain on asset and business disposals	(5,790)	(180,240)
Non-cash loss on debt financings	161	0
Change in deferred tax asset, net	23,540	58,318
Other	(105)	(396)
Decrease (increase) in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	(107,349)	(96,724)
Inventories	(23,935)	(53,762)
Costs and estimated earnings in excess of billings	(34,463)	(32,042)
Other current assets	4,438	(6,961)
Other assets	2,208	3,432
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	48,524	44,510
Accrued expenses	19,034	(21,780)
Billings in excess of costs and estimated earnings	2,812	646
Other liabilities	(2,486)	(4,601)
Net cash provided by operating activities	243,624	132,191
Cash flows from investing activities:
Acquisitions, net of cash acquired	(239,508)	(1,933)
Purchases of property, plant and equipment	(182,182)	(189,008)
Proceeds from the sale of property, plant and equipment	9,760	8,298
Proceeds from sale of businesses	0	373,790
Other	(3,602)	(2,214)
Net cash (used in) provided by investing activities	(415,532)	188,933
Cash flows from financing activities:
Debt issuance costs	(1,566)	0
Payments on debt	(8,520)	(113,769)
Cash paid for tax receivable agreement interests	(122,935)	0
Payments on acquisition-related liabilities	(12,203)	(12,964)
Distributions	(60)	(399)
Other	(6,011)	(774)
Net cash used in financing activities	(151,183)	(228,687)
Impact of foreign currency on cash	115	(1,732)
Net (decrease) increase in cash	(322,976)	90,705
Cash and cash equivalents – beginning of period	520,451	380,961
Cash and cash equivalents – end of period	197,475	471,666
Summit Materials, LLC
Cash flows from operating activities:
Net income	157,979	301,047
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	168,758	160,162
Share-based compensation expense	15,116	15,058
Net gain on asset and business disposals	(5,790)	(180,240)
Non-cash loss on debt financings	161	0
Change in deferred tax asset, net	(134)	3,842
Other	(105)	(396)
Decrease (increase) in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	(107,349)	(96,724)
Inventories	(23,935)	(53,762)
Costs and estimated earnings in excess of billings	(34,463)	(32,042)
Other current assets	38	(6,961)
Other assets	6,608	3,432
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	47,980	43,899
Accrued expenses	19,035	(21,780)
Billings in excess of costs and estimated earnings	2,812	646
Other liabilities	(3,088)	(4,601)
Net cash provided by operating activities	243,623	131,580
Cash flows from investing activities:
Acquisitions, net of cash acquired	(239,508)	(1,933)
Purchases of property, plant and equipment	(182,182)	(189,008)
Proceeds from the sale of property, plant and equipment	9,760	8,298
Proceeds from sale of businesses	0	373,790
Other	(3,602)	(2,214)
Net cash (used in) provided by investing activities	(415,532)	188,933
Cash flows from financing activities:
Capital (distributions to) contributions by member	112	(100,781)
Debt issuance costs	(1,566)	0
Payments on debt	(8,520)	(113,769)
Cash paid for tax receivable agreement interests	(122,935)	0
Payments on acquisition-related liabilities	(12,203)	(12,964)
Distributions	(4,538)	(34,155)
Other	(6,011)	(774)
Net cash used in financing activities	(155,661)	(262,443)
Impact of foreign currency on cash	115	(1,732)
Net (decrease) increase in cash	(327,455)	56,338
Cash and cash equivalents – beginning of period	520,451	380,961
Cash and cash equivalents – end of period	$ 192,996	$ 437,299

Unaudited Consolidated Statem_7

Unaudited Consolidated Statements of Changes in Stockholders’ Equity - Summit Materials Inc - USD ($) $ in Thousands	Total	Common Class A	Common Class B	Accumulated Earnings	Accumulated Other Comprehensive Income	Common Stock Common Class A	Common Stock Common Class B	Additional Paid-in Capital	Noncontrolling Interest
Beginning balance at Jan. 01, 2022	$ 1,823,212			$ 478,956	$ 7,083	$ 1,188	$ 0	$ 1,326,340	$ 9,645
Beginning balance (in shares) at Jan. 01, 2022		120,684,322				118,705,108	99
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(34,800)			(34,292)					(508)
Other comprehensive income (loss), net of tax	1,325				1,306				19
Stock option exercises (in shares)						1,589
Stock option exercises	27							27
Share-based compensation	5,422							5,422
Repurchases of common stock	(47,509)			(47,494)		$ (15)		(121)	121
Repurchases of common stock, (in shares)						(1,506,878)
Shares redeemed to settle taxes and other (in shares)						842,029
Shares redeemed to settle taxes and other	(1,180)					$ 8		(1,120)	(68)
Ending balance at Apr. 02, 2022	1,746,497			397,170	8,389	$ 1,181	$ 0	1,330,548	9,209
Ending balance (in shares) at Apr. 02, 2022						118,041,848	99
Beginning balance at Jan. 01, 2022	1,823,212			478,956	7,083	$ 1,188	$ 0	1,326,340	9,645
Beginning balance (in shares) at Jan. 01, 2022		120,684,322				118,705,108	99
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	245,617
LP Unit exchanges (in shares)		2,000
Other comprehensive income (loss), net of tax	(10,709)
Stock option exercises (in shares)		10,098
Repurchases of common stock, (in shares)		(3,427,510)
Shares redeemed to settle taxes and other (in shares)		1,097,273
Ending balance at Oct. 01, 2022	1,971,224			620,320	(3,470)	$ 1,165	$ 0	1,340,602	12,607
Ending balance (in shares) at Oct. 01, 2022		118,366,183				116,386,969	99
Beginning balance at Apr. 02, 2022	1,746,497			397,170	8,389	$ 1,181	$ 0	1,330,548	9,209
Beginning balance (in shares) at Apr. 02, 2022						118,041,848	99
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	192,766			190,113					2,653
Other comprehensive income (loss), net of tax	(4,257)				(4,196)				(61)
Stock option exercises (in shares)						4,929
Stock option exercises	96							96
Share-based compensation	4,734							4,734
Distributions from partnership	(25)								(25)
Shares redeemed to settle taxes and other (in shares)						67,835
Shares redeemed to settle taxes and other	991					$ 1		997	(7)
Ending balance at Jul. 02, 2022	1,940,802			587,283	4,193	$ 1,182	$ 0	1,336,375	11,769
Ending balance (in shares) at Jul. 02, 2022						118,114,612	99
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	87,651			86,489					1,162
LP Unit exchanges (in shares)						2,000
LP Unit exchanges	0							34	(34)
Other comprehensive income (loss), net of tax	(7,777)				(7,663)				(114)
Stock option exercises (in shares)						3,580
Stock option exercises	76							76
Share-based compensation	4,902							4,902
Repurchases of common stock	(53,471)			(53,452)		$ (19)		(198)	198
Repurchases of common stock, (in shares)						(1,920,632)
Distributions from partnership	(374)								(374)
Shares redeemed to settle taxes and other (in shares)						187,409
Shares redeemed to settle taxes and other	(585)					$ 2		(587)
Ending balance at Oct. 01, 2022	1,971,224			620,320	(3,470)	$ 1,165	$ 0	1,340,602	12,607
Ending balance (in shares) at Oct. 01, 2022		118,366,183				116,386,969	99
Beginning balance at Dec. 31, 2022	2,011,990			590,895	3,084	$ 1,185	$ 0	1,404,122	12,704
Beginning balance (in shares) at Dec. 31, 2022		118,408,655	99			118,408,655	99
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(31,212)			(30,804)					(408)
LP Unit exchanges (in shares)						2,000
LP Unit exchanges	0							21	(21)
Other comprehensive income (loss), net of tax	164				161				3
Stock option exercises (in shares)						902
Stock option exercises	15							15
Share-based compensation	4,708							4,708
Shares redeemed to settle taxes and other (in shares)						407,114
Shares redeemed to settle taxes and other	(5,719)					$ 4		(5,680)	(43)
Ending balance at Apr. 01, 2023	1,979,946			560,091	3,245	$ 1,189	$ 0	1,403,186	12,235
Ending balance (in shares) at Apr. 01, 2023						118,818,671	99
Beginning balance at Dec. 31, 2022	2,011,990			590,895	3,084	$ 1,185	$ 0	1,404,122	12,704
Beginning balance (in shares) at Dec. 31, 2022		118,408,655	99			118,408,655	99
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	286,241
LP Unit exchanges (in shares)		176,258
Other comprehensive income (loss), net of tax	215
Stock option exercises (in shares)		5,407
Shares redeemed to settle taxes and other (in shares)		522,630
Ending balance at Sep. 30, 2023	2,307,733			873,773	3,296	$ 1,192	$ 0	1,415,320	14,152
Ending balance (in shares) at Sep. 30, 2023		119,112,950	99			119,112,950	99
Beginning balance at Apr. 01, 2023	1,979,946			560,091	3,245	$ 1,189	$ 0	1,403,186	12,235
Beginning balance (in shares) at Apr. 01, 2023						118,818,671	99
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	84,728			83,637					1,091
Other comprehensive income (loss), net of tax	3,123				3,081				42
Stock option exercises (in shares)						3,338
Stock option exercises	69							69
Share-based compensation	5,216							5,216
Shares redeemed to settle taxes and other (in shares)						64,265
Shares redeemed to settle taxes and other	882					$ 1		893	(12)
Ending balance at Jul. 01, 2023	2,073,964			643,728	6,326	$ 1,190	$ 0	1,409,364	13,356
Ending balance (in shares) at Jul. 01, 2023						118,886,274	99
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	232,725			230,045					2,680
LP Unit exchanges (in shares)						174,258
LP Unit exchanges	0					$ 2		1,776	(1,778)
Other comprehensive income (loss), net of tax	(3,072)				(3,030)				(42)
Stock option exercises (in shares)						1,167
Stock option exercises	28							28
Share-based compensation	5,192							5,192
Distributions from partnership	(60)								(60)
Shares redeemed to settle taxes and other (in shares)						51,251
Shares redeemed to settle taxes and other	(1,044)					$ 0		(1,040)	(4)
Ending balance at Sep. 30, 2023	$ 2,307,733			$ 873,773	$ 3,296	$ 1,192	$ 0	$ 1,415,320	$ 14,152
Ending balance (in shares) at Sep. 30, 2023		119,112,950	99			119,112,950	99

Unaudited Consolidated Statem_8

Unaudited Consolidated Statements of Changes in Members' Interest - Summit Materials LLC - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Oct. 01, 2022	Jul. 02, 2022	Apr. 02, 2022	Sep. 30, 2023	Oct. 01, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 232,725	$ 84,728	$ (31,212)	$ 87,651	$ 192,766	$ (34,800)	$ 286,241	$ 245,617
Other comprehensive (loss) income	(3,072)	3,123	164	(7,777)	(4,257)	1,325	215	(10,709)
Share-based compensation	5,192	5,216	4,708	4,902	4,734	5,422
Shares redeemed to settle taxes and other	(1,044)	882	(5,719)	(585)	991	(1,180)
Summit Materials, LLC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,215,304	2,105,146	2,143,150	2,039,348	1,797,061	1,884,944	2,143,150	1,884,944
Net contributed capital	28	69	15	(53,395)	96	(47,482)
Net income	95,100	100,090	(37,211)	105,333	242,101	(46,387)	157,979	301,047
Other comprehensive (loss) income	(3,810)	3,902	203	(10,247)	(5,610)	1,744
Distributions	(4,538)			(34,130)	(25)
Share-based compensation	5,192	5,216	4,708	4,902	4,734	5,422
Shares redeemed to settle taxes and other	(1,174)	881	(5,719)	(585)	991	(1,180)
Ending balance	2,306,102	2,215,304	2,105,146	2,051,226	2,039,348	1,797,061	2,306,102	2,051,226
Members' equity | Summit Materials, LLC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,430,448	1,424,282	1,425,278	1,470,415	1,464,619	1,507,859	1,425,278	1,507,859
Net contributed capital	28	69	15	(53,395)	96	(47,482)
Distributions	(4,538)			(34,130)	(25)
Share-based compensation	5,192	5,216	4,708	4,902	4,734	5,422
Shares redeemed to settle taxes and other	(1,174)	881	(5,719)	(585)	991	(1,180)
Ending balance	1,429,956	1,430,448	1,424,282	1,387,207	1,470,415	1,464,619	1,429,956	1,387,207
Accumulated earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	230,045	83,637	(30,804)	86,489	190,113	(34,292)
Accumulated earnings | Summit Materials, LLC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	802,127	702,037	739,248	588,825	346,724	393,111	739,248	393,111
Net income	95,100	100,090	(37,211)	105,333	242,101	(46,387)
Ending balance	897,227	802,127	702,037	694,158	588,825	346,724	897,227	694,158
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive (loss) income	(3,030)	3,081	161	(7,663)	(4,196)	1,306
Accumulated other comprehensive loss | Summit Materials, LLC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(17,271)	(21,173)	(21,376)	(19,892)	(14,282)	(16,026)	(21,376)	(16,026)
Other comprehensive (loss) income	(3,810)	3,902	203	(10,247)	(5,610)	1,744
Ending balance	$ (21,081)	$ (17,271)	$ (21,173)	$ (30,139)	$ (19,892)	$ (14,282)	$ (21,081)	$ (30,139)

Consolidated Balance Sheets -_4

Consolidated Balance Sheets - Summit Materials LLC (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accumulated depreciation, depletion and amortization	$ 1,387,348	$ 1,267,557
Accumulated amortization	18,115	15,503
Summit Materials, LLC
Accumulated depreciation, depletion and amortization	1,387,348	1,267,557
Accumulated amortization	$ 18,115	$ 15,503

SUMMARY OF ORGANIZATION AND SIG

SUMMARY OF ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
	Sep. 30, 2023
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
SUMMARY OF ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES Summit Materials, Inc. (“Summit Inc.” and, together with its subsidiaries, “Summit,” “we,” “us,” “our” or the “Company”) is a vertically-integrated construction materials company. The Company is engaged in the production and sale of aggregates, cement, ready-mix concrete, asphalt paving mix and concrete products and owns and operates quarries, sand and gravel pits, two cement plants, cement distribution terminals, ready-mix concrete plants, asphalt plants and landfill sites. It is also engaged in paving and related services. The Company’s three operating and reporting segments are the West, East and Cement segments. Substantially all of the Company’s construction materials, products and services are produced, consumed and performed outdoors, primarily in the spring, summer and fall. Seasonal changes and other weather-related conditions can affect the production and sales volumes of its products and delivery of services. Therefore, the financial results for any interim period are typically not indicative of the results expected for the full year. Furthermore, the Company’s sales and earnings are sensitive to national, regional and local economic conditions, weather conditions and to cyclical changes in construction spending, among other factors. Summit Inc. is a holding corporation operating and controlling all of the business and affairs of Summit Materials Holdings L.P. (“Summit Holdings”) and its subsidiaries, and through Summit Holdings conducts its business. Summit Inc. owns the majority of the partnership interests of Summit Holdings (see Note 9, Stockholders’ Equity). Summit Materials, LLC (“Summit LLC”), an indirect wholly owned subsidiary of Summit Holdings, conducts the majority of our operations. Summit Materials Finance Corp. (“Summit Finance”), an indirect wholly owned subsidiary of Summit LLC, has jointly issued our Senior Notes as described below. Basis of Presentation —These unaudited consolidated financial statements were prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures typically included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. These unaudited consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and the notes thereto as of and for the year ended December 31, 2022. The Company continues to follow the accounting policies set forth in those audited consolidated financial statements. Management believes that these consolidated interim financial statements include all adjustments, normal and recurring in nature, that are necessary to present fairly the financial position of the Company as of September 30, 2023, the results of operations for the three and nine months ended September 30, 2023 and October 1, 2022 and cash flows for the nine months ended September 30, 2023 and October 1, 2022. Principles of Consolidation —The consolidated financial statements include the accounts of Summit Inc. and its majority owned subsidiaries. All intercompany balances and transactions have been eliminated. For a summary of the changes in Summit Inc.’s ownership of Summit Holdings, see Note 9, Stockholders’ Equity. Use of Estimates —Preparation of these consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and reported amounts of revenue and expenses. Such estimates include the valuation of accounts receivable, inventories, valuation of deferred tax assets, goodwill, intangibles and other long-lived assets, tax receivable agreement ("TRA") liability, pension and other postretirement obligations and asset retirement obligations. Estimates also include revenue earned on contracts and costs to complete contracts. Most of the Company’s paving and related services are performed under fixed unit-price contracts with state and local governmental entities. Management regularly evaluates its estimates and assumptions based on historical experience and other factors, including the current economic environment. As future events and their effects cannot be determined with precision, actual results can differ significantly from estimates made. Changes in estimates, including those resulting from continuing changes in the economic environment, are reflected in the Company’s consolidated financial statements when the change in estimate occurs. Business and Credit Concentrations— The Company’s operations are conducted primarily across 21 U.S. states and in British Columbia, Canada, with the most significant revenue generated in Texas, Utah, Kansas and Missouri. The Company’s accounts receivable consist primarily of amounts due from customers within these areas. Therefore, collection of these accounts is dependent on the economic conditions in the aforementioned states, as well as specific situations affecting individual customers. Credit granted within the Company’s trade areas has been granted to many customers, and management does not believe that a significant concentration of credit exists with respect to any individual customer or group of customers. No single customer accounted for more than 10% of the Company’s total revenue in the three and nine months ended September 30, 2023 or October 1, 2022. Revenue Recognition— We earn revenue from the sale of products, which primarily include aggregates, cement, ready-mix concrete and asphalt, but also include concrete products and plastics components, and from the provision of services, which are primarily paving and related services, but also include landfill operations, the receipt and disposal of waste that is converted to fuel for use in our cement plants. Products: Revenue for product sales is recognized when the performance obligation is satisfied, which generally is when the product is shipped. Services: We earn revenue from the provision of services, which are primarily paving and related services, which are typically calculated using monthly progress based on a method similar to percentage of completion or a customer’s engineer review of progress. The majority of our construction service contracts are completed within one year, but may occasionally extend beyond this time frame. The majority of our construction service contracts are for work that occurs mostly during the spring, summer and fall. We generally measure progress toward completion on long-term paving and related services contracts based on the proportion of costs incurred to date relative to total estimated costs at completion. Estimating costs to be incurred for revenue recognition involves the use of various estimating techniques to project costs at completion, and in some cases includes estimates of recoveries asserted against the customer for changes in specifications or other disputes. Earnings per Share— The Company computes basic earnings per share attributable to stockholders by dividing income attributable to Summit Inc. by the weighted-average shares of Class A common stock outstanding. Diluted earnings per share reflects the potential dilution beyond shares for basic earnings per share that could occur if securities or other contracts to issue common stock were exercised, converted into common stock, or resulted in the issuance of common stock that would have shared in the Company’s earnings. Since the Class B common stock has no economic value, those shares are not included in the weighted-average common share amount for basic or diluted earnings per share. In addition, as the shares of Class A common stock are issued by Summit Inc., the earnings and equity interests of noncontrolling interests are not included in basic earnings per share. Prior Year Reclassifications — We have reclassified transaction costs of $0.7 million and $2.6 million for the three and nine months ended October 1, 2022, respectively, from general and administrative expenses to a separate line item included in operating income to conform to the current year presentation.
Summit Materials, LLC
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
SUMMARY OF ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES Summit Materials, LLC (“Summit LLC” and, together with its subsidiaries, “Summit,” “we,” “us,” “our” or the “Company”) is a vertically-integrated construction materials company. The Company is engaged in the production and sale of aggregates, cement, ready-mix concrete, asphalt paving mix and concrete products and owns and operates quarries, sand and gravel pits, two cement plants, cement distribution terminals, ready-mix concrete plants, asphalt plants and landfill sites. It is also engaged in paving and related services. The Company’s three operating and reporting segments are the West, East and Cement segments. Substantially all of the Company’s construction materials, products and services are produced, consumed and performed outdoors, primarily in the spring, summer and fall. Seasonal changes and other weather-related conditions can affect the production and sales volumes of its products and delivery of services. Therefore, the financial results for any interim period are typically not indicative of the results expected for the full year. Furthermore, the Company’s sales and earnings are sensitive to national, regional and local economic conditions, weather conditions and to cyclical changes in construction spending, among other factors. Summit LLC is a wholly owned indirect subsidiary of Summit Materials Holdings L.P. (“Summit Holdings”), whose primary owner is Summit Materials, Inc. (“Summit Inc.”). Summit Inc. was formed as a Delaware corporation on September 23, 2014. Its sole material asset is a controlling equity interest in Summit Holdings. Pursuant to a reorganization into a holding company structure (the “Reorganization”) consummated in connection with Summit Inc.’s March 2015 initial public offering, Summit Inc. became a holding corporation operating and controlling all of the business and affairs of Summit Holdings and its subsidiaries, including Summit LLC. Basis of Presentation —These unaudited consolidated financial statements were prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures typically included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. These unaudited consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto as of and for the year ended December 31, 2022. The Company continues to follow the accounting policies set forth in those audited consolidated financial statements. Management believes that these consolidated interim financial statements include all adjustments, normal and recurring in nature, that are necessary to present fairly the financial position of the Company as of September 30, 2023, the results of operations for the three and nine months ended September 30, 2023 and October 1, 2022 and cash flows for the nine months ended September 30, 2023 and October 1, 2022. Use of Estimates —Preparation of these consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and reported amounts of revenue and expenses. Such estimates include the valuation of accounts receivable, inventories, valuation of deferred tax assets, goodwill, intangibles and other long-lived assets, tax receivable agreement ("TRA") asset, pension and other postretirement obligations and asset retirement obligations. Estimates also include revenue earned on contracts and costs to complete contracts. Most of the Company’s paving and related services are performed under fixed unit-price contracts with state and local governmental entities. Management regularly evaluates its estimates and assumptions based on historical experience and other factors, including the current economic environment. As future events and their effects cannot be determined with precision, actual results can differ significantly from estimates made. Changes in estimates, including those resulting from continuing changes in the economic environment, are reflected in the Company’s consolidated financial statements when the change in estimate occurs. Business and Credit Concentrations— The Company’s operations are conducted primarily across 21 U.S. states and in British Columbia, Canada, with the most significant revenue generated in Texas, Utah, Kansas and Missouri. The Company’s accounts receivable consist primarily of amounts due from customers within these areas. Therefore, collection of these accounts is dependent on the economic conditions in the aforementioned states, as well as specific situations affecting individual customers. Credit granted within the Company’s trade areas has been granted to many customers, and management does not believe that a significant concentration of credit exists with respect to any individual customer or group of customers. No single customer accounted for more than 10% of the Company’s total revenue in the three and nine months ended September 30, 2023 or October 1, 2022. Revenue Recognition— We earn revenue from the sale of products, which primarily include aggregates, cement, ready-mix concrete and asphalt, but also include concrete products and plastics components, and from the provision of services, which are primarily paving and related services, but also include landfill operations, the receipt and disposal of waste that is converted to fuel for use in our cement plants. Products: Revenue for product sales is recognized when the performance obligation is satisfied, which generally is when the product is shipped. Services: We earn revenue from the provision of services, which are primarily paving and related services, which are typically calculated using monthly progress based on a method similar to percentage of completion or a customer’s engineer review of progress. The majority of our construction service contracts are completed within one year, but may occasionally extend beyond this time frame. The majority of our construction service contracts are for work that occurs mostly during the spring, summer and fall. We generally measure progress toward completion on long-term paving and related services contracts based on the proportion of costs incurred to date relative to total estimated costs at completion. Estimating costs to be incurred for revenue recognition involves the use of various estimating techniques to project costs at completion, and in some cases includes estimates of recoveries asserted against the customer for changes in specifications or other disputes. Prior Year Reclassifications — We have reclassified transaction costs of $0.7 million and $2.6 million for the three and nine months ended October 1, 2022, respectively, from general and administrative expenses to a separate line item included in operating income to conform to the current year presentation.

ACQUISITIONS, DISPOSTIONS, GOOD

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES	9 Months Ended
	Sep. 30, 2023
Business Acquisition [Line Items]
ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES	ACQUISITIONS, DISPOSITIONS, GOODWILL AND INTANGIBLES The financial results of each acquisition have been included in the Company’s consolidated results of operations beginning on the respective closing dates of the acquisitions. The Company measures all assets acquired and liabilities assumed at their acquisition-date fair value. Goodwill acquired during a business combination has an indefinite life and is not amortized. The following table summarizes the Company’s acquisitions by region and period: Nine months ended Year ended September 30, 2023 December 31, 2022 West 3 — East 1 2 The purchase price allocation, primarily the valuation of property, plant and equipment for the acquisitions completed during the nine months ended September 30, 2023, as well as the acquisitions completed during 2022 that occurred after October 1, 2022, have not yet been finalized due to the recent timing of the acquisitions, status of the valuation of property, plant and equipment and finalization of related tax returns. The following table summarizes aggregated information regarding the fair values of the assets acquired and liabilities assumed as of the respective acquisition dates: Nine months ended Year ended September 30, 2023 December 31, 2022 Financial assets $ 12,747 $ 297 Inventories 6,694 161 Property, plant and equipment 124,051 30,041 Other assets 1,550 1,116 Financial liabilities (11,973) (1,120) Other long-term liabilities (768) (1,589) Net assets acquired 132,301 28,906 Goodwill 108,803 — Purchase price 241,104 28,906 Acquisition-related liabilities — (6,176) Other (1,596) — Net cash paid for acquisitions $ 239,508 $ 22,730 Changes in the carrying amount of goodwill, by reportable segment, from December 31, 2022 to September 30, 2023 are summarized as follows: West East Cement Total Balance—December 31, 2022 $ 566,389 $ 361,501 $ 204,656 $ 1,132,546 Acquisitions (1) 108,803 — — 108,803 Foreign currency translation adjustments 123 — — 123 Balance—September 30, 2023 $ 675,315 $ 361,501 $ 204,656 $ 1,241,472 _______________________________________________________________________ (1) Reflects goodwill from 2023 acquisitions. The Company’s intangible assets subject to amortization are primarily composed of operating permits, mineral lease agreements and reserve rights. Operating permits relate to permitting and zoning rights acquired outside of a business combination. The assets related to mineral lease agreements reflect the submarket royalty rates paid under agreements, primarily for extracting aggregates. The values were determined as of the respective acquisition dates by a comparison of market-royalty rates. The reserve rights relate to aggregate reserves to which the Company has certain rights of ownership, but does not own the reserves. The intangible assets are amortized on a straight-line basis over the lives of the leases or permits. The following table shows intangible assets by type and in total: September 30, 2023 December 31, 2022 Gross Accumulated Net Gross Accumulated Net Operating permits $ 38,677 $ (5,291) $ 33,386 $ 38,677 $ (4,109) $ 34,568 Mineral leases 17,778 (7,452) 10,326 18,091 (7,056) 11,035 Reserve rights 25,586 (4,814) 20,772 25,242 (3,872) 21,370 Other 4,888 (558) 4,330 4,877 (466) 4,411 Total intangible assets $ 86,929 $ (18,115) $ 68,814 $ 86,887 $ (15,503) $ 71,384 Amortization expense totaled $0.8 million and $2.6 million for the three and nine months ended September 30, 2023, respectively, and $0.8 million and $2.6 million for the three and nine months ended October 1, 2022, respectively. The estimated amortization expense for the intangible assets for each of the five years subsequent to September 30, 2023 is as follows: 2023 (three months) $ 1,001 2024 4,011 2025 3,969 2026 3,920 2027 3,908 2028 3,910 Thereafter 48,095 Total $ 68,814
Summit Materials, LLC
Business Acquisition [Line Items]
ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES	ACQUISITIONS, DISPOSITIONS, GOODWILL AND INTANGIBLES The financial results of each acquisition have been included in the Company’s consolidated results of operations beginning on the respective closing dates of the acquisitions. The Company measures all assets acquired and liabilities assumed at their acquisition-date fair value. Goodwill acquired during a business combination has an indefinite life and is not amortized. The following table summarizes the Company’s acquisitions by region and period: Nine months ended Year ended September 30, 2023 December 31, 2022 West 3 — East 1 2 The purchase price allocation, primarily the valuation of property, plant and equipment for the acquisitions completed during the nine months ended September 30, 2023, as well as the acquisitions completed during 2022 that occurred after October 1, 2022, have not yet been finalized due to the recent timing of the acquisitions, status of the valuation of property, plant and equipment and finalization of related tax returns. The following table summarizes aggregated information regarding the fair values of the assets acquired and liabilities assumed as of the respective acquisition dates: Nine months ended Year ended September 30, 2023 December 31, 2022 Financial assets $ 12,747 $ 297 Inventories 6,694 161 Property, plant and equipment 124,051 30,041 Other assets 1,550 1,116 Financial liabilities (11,973) (1,120) Other long-term liabilities (768) (1,589) Net assets acquired 132,301 28,906 Goodwill 108,803 — Purchase price 241,104 28,906 Acquisition-related liabilities — (6,176) Other (1,596) — Net cash paid for acquisitions $ 239,508 $ 22,730 Changes in the carrying amount of goodwill, by reportable segment, from December 31, 2022 to September 30, 2023 are summarized as follows: West East Cement Total Balance—December 31, 2022 $ 567,389 $ 361,501 $ 204,656 $ 1,133,546 Acquisitions (1) 108,803 — — 108,803 Foreign currency translation adjustments 123 — — 123 Balance—September 30, 2023 $ 676,315 $ 361,501 $ 204,656 $ 1,242,472 _______________________________________________________________________ (1) Reflects goodwill from 2023 acquisitions. The Company’s intangible assets subject to amortization are primarily composed of operating permits, mineral lease agreements and reserve rights. Operating permits relate to permitting and zoning rights acquired outside of a business combination. The assets related to mineral lease agreements reflect the submarket royalty rates paid under agreements, primarily for extracting aggregates. The values were determined as of the respective acquisition dates by a comparison of market-royalty rates. The reserve rights relate to aggregate reserves to which the Company has certain rights of ownership, but does not own the reserves. The intangible assets are amortized on a straight-line basis over the lives of the leases or permits. The following table shows intangible assets by type and in total: September 30, 2023 December 31, 2022 Gross Accumulated Net Gross Accumulated Net Operating permits $ 38,677 $ (5,291) $ 33,386 $ 38,677 $ (4,109) $ 34,568 Mineral leases 17,778 (7,452) 10,326 18,091 (7,056) 11,035 Reserve rights 25,586 (4,814) 20,772 25,242 (3,872) 21,370 Other 4,888 (558) 4,330 4,877 (466) 4,411 Total intangible assets $ 86,929 $ (18,115) $ 68,814 $ 86,887 $ (15,503) $ 71,384 Amortization expense totaled $0.8 million and $2.6 million for the three and nine months ended September 30, 2023, respectively, and $0.8 million and $2.6 million for the three and nine months ended October 1, 2022, respectively The estimated amortization expense for the intangible assets for each of the five years subsequent to September 30, 2023 is as follows: 2023 (three months) $ 1,001 2024 4,011 2025 3,969 2026 3,920 2027 3,908 2028 3,910 Thereafter 48,095 Total $ 68,814

REVENUE RECOGNITION

REVENUE RECOGNITION	9 Months Ended
	Sep. 30, 2023
Revenue from External Customer [Line Items]
REVENUE RECOGNITION	REVENUE RECOGNITION We derive our revenue predominantly by selling construction materials, products and providing paving and related services. Construction materials consist of aggregates and cement. Products consist of related downstream products, including ready-mix concrete, asphalt paving mix and concrete products. Paving and related service revenue is generated primarily from the asphalt paving services that we provide. Revenue by product for the three and nine months ended September 30, 2023 and October 1, 2022 is as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Revenue by product*: Aggregates $ 179,819 $ 163,524 $ 505,984 $ 448,397 Cement 115,135 112,489 267,755 241,858 Ready-mix concrete 213,325 189,081 551,673 530,001 Asphalt 117,896 106,804 236,340 218,083 Paving and related services 110,370 120,327 226,928 249,547 Other 58,252 60,522 170,655 172,362 Total revenue $ 794,797 $ 752,747 $ 1,959,335 $ 1,860,248 *Revenue from liquid asphalt terminals is included in asphalt revenue. Accounts receivable, net consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Trade accounts receivable $ 305,436 $ 215,766 Construction contract receivables 64,438 37,067 Retention receivables 13,165 11,048 Accounts receivable 383,039 263,881 Less: Allowance for doubtful accounts (7,110) (7,212) Accounts receivable, net $ 375,929 $ 256,669 Retention receivables are amounts earned by the Company but held by customers until paving and related service contracts and projects are near completion or fully completed. Amounts are generally billed and collected within one year.
Summit Materials, LLC
Revenue from External Customer [Line Items]
REVENUE RECOGNITION	REVENUE RECOGNITION We derive our revenue predominantly by selling construction materials, products and providing paving and related services. Construction materials consist of aggregates and cement. Products consist of related downstream products, including ready-mix concrete, asphalt paving mix and concrete products. Paving and related service revenue is generated primarily from the asphalt paving services that we provide. Revenue by product for the three and nine months ended September 30, 2023 and October 1, 2022 is as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Revenue by product*: Aggregates $ 179,819 $ 163,524 $ 505,984 $ 448,397 Cement 115,135 112,489 267,755 241,858 Ready-mix concrete 213,325 189,081 551,673 530,001 Asphalt 117,896 106,804 236,340 218,083 Paving and related services 110,370 120,327 226,928 249,547 Other 58,252 60,522 170,655 172,362 Total revenue $ 794,797 $ 752,747 $ 1,959,335 $ 1,860,248 *Revenue from liquid asphalt terminals is included in asphalt revenue. Accounts receivable, net consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Trade accounts receivable $ 305,436 $ 215,766 Construction contract receivables 64,438 37,067 Retention receivables 13,165 11,048 Accounts receivable 383,039 263,881 Less: Allowance for doubtful accounts (7,110) (7,212) Accounts receivable, net $ 375,929 $ 256,669 Retention receivables are amounts earned by the Company but held by customers until paving and related service contracts and projects are near completion or fully completed. Amounts are generally billed and collected within one year.

INVENTORIES

INVENTORIES	9 Months Ended
	Sep. 30, 2023
Inventory [Line Items]
INVENTORIES	INVENTORIES Inventories consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Aggregate stockpiles $ 165,071 $ 148,347 Finished goods 43,316 33,622 Work in process 11,220 8,191 Raw materials 23,529 22,331 Total $ 243,136 $ 212,491
Summit Materials, LLC
Inventory [Line Items]
INVENTORIES	INVENTORIES Inventories consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Aggregate stockpiles $ 165,071 $ 148,347 Finished goods 43,316 33,622 Work in process 11,220 8,191 Raw materials 23,529 22,331 Total $ 243,136 $ 212,491

ACCRUED EXPENSES

ACCRUED EXPENSES	9 Months Ended
	Sep. 30, 2023
Schedule Of Accrued Expenses [Line Items]
ACCRUED EXPENSES	ACCRUED EXPENSES Accrued expenses consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Interest $ 10,677 $ 24,625 Payroll and benefits 48,595 34,485 Finance lease obligations 3,399 6,959 Insurance 23,874 18,127 Current portion of TRA liability and non-income taxes 14,349 4,360 Deferred asset purchase payments 5,892 5,131 Professional fees 11,980 924 Other (1) 28,853 25,356 Total $ 147,619 $ 119,967 (1) Consists primarily of current portion of asset retirement obligations and miscellaneous accruals.
Summit Materials, LLC
Schedule Of Accrued Expenses [Line Items]
ACCRUED EXPENSES	ACCRUED EXPENSES Accrued expenses consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Interest $ 10,677 $ 24,625 Payroll and benefits 48,595 34,485 Finance lease obligations 3,399 6,959 Insurance 23,874 18,127 Non-income taxes 14,835 5,101 Deferred asset purchase payments 5,892 5,131 Professional fees 11,980 924 Other (1) 28,853 25,356 Total $ 148,105 $ 120,708 _______________________________________________________________________ (1) Consists primarily of current portion of asset retirement obligations and miscellaneous accruals.

DEBT

DEBT	9 Months Ended
	Sep. 30, 2023
Debt Instrument [Line Items]
DEBT	DEBT Debt consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Term Loan, due 2027: $505.7 million and $509.6 million, net of $4.2 million and $5.0 million discount at September 30, 2023 and December 31, 2022, respectively $ 501,492 $ 504,549 6 1 ⁄ 2 % Senior Notes, due 2027 300,000 300,000 5 1 ⁄ 4 % Senior Notes, due 2029 700,000 700,000 Total 1,501,492 1,504,549 Current portion of long-term debt 3,822 5,096 Long-term debt $ 1,497,670 $ 1,499,453 The contractual payments of long-term debt, including current maturities, for the five years subsequent to September 30, 2023, are as follows: 2023 (three months) $ 1,274 2024 3,822 2025 6,369 2026 5,096 2027 789,177 2028 — Thereafter 700,000 Total 1,505,738 Less: Original issue net discount (4,246) Less: Capitalized loan costs (9,601) Total debt $ 1,491,891 Senior Notes — On August 11, 2020, Summit LLC and Summit Finance (together, the “Issuers”) issued $700.0 million in aggregate principal amount of 5.250% senior notes due January 15, 2029 (the “2029 Notes”). The 2029 Notes were issued at 100.0% of their par value with proceeds of $690.4 million, net of related fees and expenses. The 2029 Notes were issued under an indenture dated August 11, 2020 (the "2029 Notes Indenture"). The 2029 Notes Indenture contains covenants limiting, among other things, Summit LLC and its restricted subsidiaries’ ability to incur additional indebtedness or issue certain preferred shares, pay dividends, redeem stock or make other distributions, make certain investments, sell or transfer certain assets, create liens, consolidate, merge, sell or otherwise dispose of all or substantially all of its assets, enter into certain transactions with affiliates, and designate subsidiaries as unrestricted subsidiaries. The 2029 Notes Indenture also contains customary events of default. Interest on the 2029 Notes is payable semi-annually on January 15 and July 15 of each year commencing on January 15, 2021. On March 15, 2019, the Issuers issued $300.0 million in aggregate principal amount of 6.500% senior notes due March 15, 2027 (the “2027 Notes”). The 2027 Notes were issued at 100.0% of their par value with proceeds of $296.3 million, net of related fees and expenses. The 2027 Notes were issued under an indenture dated March 25, 2019, the terms of which are generally consistent with the 2029 Notes Indenture. Interest on the 2027 Notes is payable semi-annually on March 15 and September 15 of each year commencing on September 15, 2019. As of September 30, 2023 and December 31, 2022, the Company was in compliance with all covenants under the applicable indentures. Senior Secured Credit Facilities — Summit LLC has credit facilities that provide for term loans in an aggregate amount of $505.7 million and revolving credit commitments in an aggregate amount of $395.0 million (the “Senior Secured Credit Facilities”). Under the Senior Secured Credit Facilities, required principal repayments of 0.25% of the refinanced aggregate amount of term debt are due on the last business day of each March, June, September and December commencing with the March 2023 payment. The interest rate on the term loan is a variable rate, it was 8.57% as of September 30, 2023. In 2022, the Company repaid $95.6 million of its term loan under provisions related to divestitures of businesses. On December 14, 2022, Summit Materials, LLC entered into Amendment No. 5 to the credit agreement governing the Senior Secured Credit Facilities (the “Credit Agreement”), which among other things, (a) refinanced the existing $509.6 million of existing term loans with new term loans under the Term Loan Facility bearing interest, at Summit LLC’s option, based on either the base rate or Term Secured Overnight Financing Rate ("SOFR") rate and an applicable margin of (i) 2.00% per annum with respect to base rate borrowings and a floor of 1.00% per annum or (ii) 3.00% per annum with respect to Term SOFR borrowings, with a SOFR adjustment of 0.10% per annum and a floor of zero, and (b) extended the maturity date to December 14, 2027. On January 10, 2023, Summit Materials, LLC entered into Amendment No. 6 to the Credit Agreement, which among other things, increased the maximum amount available to $395.0 million and extended the maturity date to January 10, 2028. The revolving credit agreement bears interest per annum equal to a Term SOFR Rate with a SOFR adjustment of 0.10% per annum and a floor of zero. There were no outstanding borrowings under the revolving credit facility as of September 30, 2023 and December 31, 2022, with borrowing capacity of $374.1 million remaining as of September 30, 2023, which is net of $20.9 million of outstanding letters of credit. The outstanding letters of credit are renewed annually and support required bonding on construction projects, large leases, workers compensation claims and the Company’s insurance liabilities. Summit LLC’s Consolidated First Lien Net Leverage Ratio, as such term is defined in the Credit Agreement, should be no greater than 4.75:1.0 as of each quarter-end. As of September 30, 2023 and December 31, 2022, Summit LLC was in compliance with all financial covenants. Summit LLC’s wholly-owned domestic subsidiary companies, subject to certain exclusions and exceptions, are named as subsidiary guarantors of the Senior Notes and the Senior Secured Credit Facilities. In addition, Summit LLC has pledged substantially all of its assets as collateral, subject to certain exclusions and exceptions, for the Senior Secured Credit Facilities. In September 2023, in connection with our agreement to combine with Argos USA, we obtained a $1.3 billion 364-day term loan bridge facility commitment from various financial institutions. The term loan bridge facility may only be drawn to close the transaction. We expect to obtain permanent financing prior to our combination with Argos USA, at which time the term loan bridge facility commitment will expire. The following table presents the activity for the deferred financing fees for the nine months ended September 30, 2023 and October 1, 2022: Deferred financing fees Balance—December 31, 2022 $ 11,489 Loan origination fees 1,566 Amortization (1,838) Write off of deferred financing fees (160) Balance—September 30, 2023 $ 11,057 Balance—January 1, 2022 $ 13,049 Amortization (2,028) Balance—October 1, 2022 $ 11,021 Other —On January 15, 2015, the Company’s wholly-owned subsidiary in British Columbia, Canada entered into an agreement with HSBC Bank Canada, which was amended on November 30, 2020, for a (i) $6.0 million Canadian dollar (“CAD”) revolving credit commitment to be used for operating activities that bears interest per annum equal to the bank’s prime rate plus 0.20%, (ii) $0.5 million CAD revolving credit commitment to be used for capital equipment that bears interest per annum at the bank’s prime rate plus 0.20% and (iii) $1.5 million CAD revolving credit commitment to provide guarantees on behalf of that subsidiary and (iv) $10.0 million CAD revolving foreign exchange facility available to purchase foreign exchange forward contracts. There were no amounts outstanding under this agreement as of September 30, 2023 or December 31, 2022, which may be terminated upon demand.
Summit Materials, LLC
Debt Instrument [Line Items]
DEBT	DEBT Debt consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Term Loan, due 2027: $505.7 million and $509.6 million, net of $4.2 million and $5.0 million discount at September 30, 2023 and December 31, 2022, respectively $ 501,492 $ 504,549 6 1/2 % Senior Notes, due 2027 300,000 300,000 5 1/4 % Senior Notes, due 2029 700,000 700,000 Total 1,501,492 1,504,549 Current portion of long-term debt 3,822 5,096 Long-term debt $ 1,497,670 $ 1,499,453 The contractual payments of long-term debt, including current maturities, for the five years subsequent to September 30, 2023, are as follows: 2023 (three months) $ 1,274 2024 3,822 2025 6,369 2026 5,096 2027 789,177 2028 — Thereafter 700,000 Total 1,505,738 Less: Original issue net discount (4,246) Less: Capitalized loan costs (9,601) Total debt $ 1,491,891 Senior Notes —On August 11, 2020, Summit LLC and Summit Finance (together, the “Issuers”) issued $700.0 million in aggregate principal amount of 5.250% senior notes due January 15, 2029 (the “2029 Notes”). The 2029 Notes were issued at 100.0% of their par value with proceeds of $690.4 million, net of related fees and expenses. The 2029 Notes were issued under an indenture dated August 11, 2020 (the "2029 Notes Indenture"). The 2029 Notes Indenture contains covenants limiting, among other things, Summit LLC and its restricted subsidiaries’ ability to incur additional indebtedness or issue certain preferred shares, pay dividends, redeem stock or make other distributions, make certain investments, sell or transfer certain assets, create liens, consolidate, merge, sell or otherwise dispose of all or substantially all of its assets, enter into certain transactions with affiliates, and designate subsidiaries as unrestricted subsidiaries. The 2029 Notes Indenture also contains customary events of default. Interest on the 2029 Notes is payable semi-annually on January 15 and July 15 of each year commencing on January 15, 2021. On March 15, 2019, the Issuers issued $300.0 million in aggregate principal amount of 6.500% senior notes due March 15, 2027 (the “2027 Notes”). The 2027 Notes were issued at 100.0% of their par value with proceeds of $296.3 million, net of related fees and expenses. The 2027 Notes were issued under an indenture dated March 25, 2019, the terms of which are generally consistent with the 2029 Notes Indenture. Interest on the 2027 Notes is payable semi-annually on March 15 and September 15 of each year commencing on September 15, 2019. As of September 30, 2023 and December 31, 2022, the Company was in compliance with all covenants under the applicable indentures. Senior Secured Credit Facilities — Summit LLC has credit facilities that provide for term loans in an aggregate amount of $505.7 million and revolving credit commitments in an aggregate amount of $395.0 million (the “Senior Secured Credit Facilities”). Under the Senior Secured Credit Facilities, required principal repayments of 0.25% of the refinanced aggregate amount of term debt are due on the last business day of each March, June, September and December commencing with the March 2023 payment. The interest rate on the term loan is a variable rate, it was 8.57% as of September 30, 2023. In 2022, the Company repaid $95.6 million of its term loan under provisions related to divestitures of businesses. On December 14, 2022, Summit Materials, LLC entered into Amendment No. 5 to the credit agreement governing the Senior Secured Credit Facilities (the “Credit Agreement”), which among other things, (a) refinanced the existing $509.6 million of existing term loans with new term loans under the Term Loan Facility bearing interest, at Summit LLC’s option, based on either the base rate or Term Secured Overnight Financing Rate (“SOFR”) rate and an applicable margin of (i) 2.00% per annum with respect to base rate borrowings and a floor of 1.00% per annum or (ii) 3.00% per annum with respect to Term SOFR borrowings, with a SOFR adjustment of 0.10% per annum and a floor of zero, and (b) extended the maturity date to December 14, 2027. On January 10, 2023, Summit Materials, LLC entered into Amendment No. 6 to the Credit Agreement, which among other things, increased the maximum amount available to $395.0 million and extended the maturity date to January 10, 2028. The revolving credit agreement bears interest per annum equal to a Term SOFR Rate with a SOFR adjustment of 0.10% per annum and a floor of zero. There were no outstanding borrowings under the revolving credit facility as of September 30, 2023 and December 31, 2022, with borrowing capacity of $374.1 million remaining as of September 30, 2023, which is net of $20.9 million of outstanding letters of credit. The outstanding letters of credit are renewed annually and support required bonding on construction projects, large leases, workers compensation claims and the Company’s insurance liabilities. Summit LLC’s Consolidated First Lien Net Leverage Ratio, as such term is defined in the Credit Agreement, should be no greater than 4.75:1.0 as of each quarter-end. As of September 30, 2023 and December 31, 2022, Summit LLC was in compliance with all financial covenants. Summit LLC’s wholly-owned domestic subsidiary companies, subject to certain exclusions and exceptions, are named as subsidiary guarantors of the Senior Notes and the Senior Secured Credit Facilities. In addition, Summit LLC has pledged substantially all of its assets as collateral, subject to certain exclusions and exceptions, for the Senior Secured Credit Facilities. In September 2023, in connection with our agreement to combine with Argos USA, we obtained a $1.3 billion 364-day term loan bridge facility commitment from various financial institutions. The term loan bridge facility may only be drawn to close the transaction. We expect to obtain permanent financing prior to our combination with Argos USA, at which time the term loan bridge facility commitment will expire. The following table presents the activity for the deferred financing fees for the nine months ended September 30, 2023 and October 1, 2022: Deferred financing fees Balance—December 31, 2022 $ 11,489 Loan origination fees 1,566 Amortization (1,838) Write off of deferred financing fees (160) Balance—September 30, 2023 $ 11,057 Balance - January 1, 2022 $ 13,049 Amortization (2,028) Balance -October 1, 2022 $ 11,021 Other —On January 15, 2015, the Company’s wholly-owned subsidiary in British Columbia, Canada entered into an agreement with HSBC Bank Canada, which was amended on November 30, 2020, for a (i) $6.0 million Canadian dollar (“CAD”) revolving credit commitment to be used for operating activities that bears interest per annum equal to the bank’s prime rate plus 0.20%, (ii) $0.5 million CAD revolving credit commitment to be used for capital equipment that bears interest per annum at the bank’s prime rate plus 0.20% and (iii) $1.5 million CAD revolving credit commitment to provide guarantees on behalf of that subsidiary and (iv) $10.0 million CAD revolving foreign exchange facility available to purchase foreign exchange forward contracts. There were no amounts outstanding under this agreement as of September 30, 2023 or December 31, 2022, which may be terminated upon demand.

INCOME TAXES

INCOME TAXES	9 Months Ended
	Sep. 30, 2023
Income Taxes [Line Items]
INCOME TAXES	INCOME TAXES Summit Inc.’s tax provision includes its proportional share of Summit Holdings’ tax attributes. Summit Holdings’ subsidiaries are primarily limited liability companies but do include certain entities organized as C corporations and a Canadian subsidiary. The tax attributes related to the limited liability companies are passed on to Summit Holdings and then to its partners, including Summit Inc. The tax attributes associated with the C corporation and Canadian subsidiaries are fully reflected in the Company’s accounts. Our income tax expense was $23.9 million and $39.9 million in the three and nine months ended September 30, 2023, respectively, and our income tax expense was $24.8 million and $74.0 million in the three and nine months ended October 1, 2022, respectively. The effective tax rate for Summit Inc. differs from the federal statutory tax rate primarily due to (1) the non-taxability of the tax receivable agreement benefit (2) tax depletion expense in excess of the expense recorded under U.S. GAAP, (3) basis differences in assets divested, (4) state taxes, (5) the minority interest in the Summit Holdings partnership that is allocated outside of the Company and (6) various other items such as limitations on meals and entertainment, certain stock compensation and other costs. As of September 30, 2023 and December 31, 2022, Summit Inc. had a valuation allowance of $1.1 million in both periods, which relates to certain deferred tax assets in taxable entities where realization is not more likely than not. No material interest or penalties were recognized in income tax expense during the three and nine months ended September 30, 2023 and October 1, 2022. Tax Receivable Agreement —The Company is party to a TRA with certain current and former holders of LP Units that provides for the payment by Summit Inc. to exchanging holders of LP Units of 85% of the benefits, if any, that Summit Inc. actually realizes (or, under certain circumstances such as an early termination of the TRA, is deemed to realize) as a result of increases in the tax basis of tangible and intangible assets of Summit Holdings and certain other tax benefits related to entering into the TRA, including tax benefits attributable to payments under the TRA. In the third quarter of 2023, Summit LLC reached an agreement to acquire all of the rights and interests in the TRA from affiliates of Blackstone Inc. and certain other TRA holders for cash consideration of $122.9 million. In connection with these transactions, Summit LLC and Summit Inc. reached an agreement whereby the maximum amount Summit Inc. is obligated to pay Summit LLC for the TRA interests acquired is limited to the amount Summit LLC paid for the TRA interests. As the cash paid for TRA interests acquired was less than their carrying value, Summit Inc. recognized a tax receivable agreement benefit of $153.1 million in the accompanying consolidated statement of operations. In the nine months ended September 30, 2023, 176,258 LP Units were acquired by Summit Inc. in exchange for an equal number of newly-issued shares of Summit Inc.’s Class A common stock. Subsequent to quarter end, an additional 345,554 LP units were exchanged for an equal amount of newly issued shares of Summit Inc.'s Class A common stock, and Summit LLC. Summit LLC then acquired the interest in the TRA interests from certain of those holders for aggregate cash consideration of $9.5 million, resulting in further reduction of the TRA liability of approximately $19.3 million. Changes in the balance of the TRA liability, from December 31, 2022 to September 30, 2023 are summarized as follows: TRA Liability Balance — December 31, 2022 $ 328,356 LP unit exchanges during period 1,146 Purchase of TRA interests (122,935) TRA liability reduction (153,080) TRA liability payments (544) Total 52,943 Less current portion 800 Balance — September 30, 2023 $ 52,143 Tax Distributions – The holders of Summit Holdings’ LP Units, including Summit Inc., incur U.S. federal, state and local income taxes on their share of any taxable income of Summit Holdings. The limited partnership agreement of Summit Holdings provides for pro rata cash distributions (“tax distributions”) to the holders of the LP Units in an amount generally calculated to provide each holder of LP Units with sufficient cash to cover its tax liability in respect of the LP Units. In general, these tax distributions are computed based on Summit Holdings’ estimated taxable income allocated to Summit Inc. multiplied by an assumed tax rate equal to the highest effective marginal combined U.S. federal, state and local income tax rate in New York, New York. In the nine months ended September 30, 2023, Summit Holdings paid tax distributions of approximately $4.5 million, of which $0.1 million was paid to holders of its LP Units not owned by Summit Inc. In the nine months ended October 1, 2022, Summit Holdings made a tax distribution of approximately $34.2 million, of which $0.4 million went to LP units not owned by Summit Inc.
Summit Materials, LLC
Income Taxes [Line Items]
INCOME TAXES	INCOME TAXES Summit LLC is a limited liability company and passes its tax attributes for federal and state tax purposes to its parent company and is generally not subject to federal or state income tax. However, certain subsidiary entities file federal, state and Canadian income tax returns due to their status as taxable entities in the respective jurisdiction. The effective income tax rate for the C Corporations differs from the statutory federal rate primarily due to (1) tax depletion expense in excess of the expense recorded under U.S. GAAP, (2) basis differences in assets divested, (3) state income taxes and the effect of graduated tax rates and (4) various other items, such as limitations on meals and entertainment and other costs. The effective income tax rate for the Canadian subsidiary is not significantly different from its historical effective tax rate. No material interest or penalties were recognized in income tax expense during the three and nine months ended September 30, 2023 and October 1, 2022. In 2015, Summit Inc. entered into a TRA with the holders of LP Units and certain other pre-initial public offering owners that provides for the payment by Summit Inc. to exchanging holders of LP Units of 85% of the benefits, if any, that Summit Inc. actually realizes (or, under certain circumstances such as an early termination of the TRA, is deemed to realize) as the result of increases in the tax basis of tangible and intangible assets of Summit Holdings and certain other tax benefits related to entering into the TRA, including the tax benefits attributable to payments under the TRA. In the third quarter of 2023, Summit LLC reached an agreement to acquire all of the rights and interests in the TRA from affiliates of Blackstone Inc. and certain other TRA holders for cash consideration of $122.9 million. In connection with these transactions, Summit LLC and Summit Inc. reached an agreement whereby the maximum amount Summit Inc is obligated to pay Summit LLC for the TRA interests acquired is limited to the amount Summit LLC paid for the TRA interests. Each year, Summit Inc updates the estimated timing as to when TRA payments are expected to be made. The timing and cash tax savings of those payments can cause variations in the future value of the TRA tax attributes.. Summit LLC expects to fully realize the value its TRA interests held via future payments from Summit Inc. As of September 30, 2023, Summit LLC had a current TRA interest asset of $4.4 million and a noncurrent TRA interest asset of $118.5 million.

EARNINGS PER SHARE

EARNINGS PER SHARE	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Basic earnings per share is computed by dividing net earnings by the weighted average common shares outstanding and diluted net earnings is computed by dividing net earnings, adjusted for changes in the earnings allocated to Summit Inc. as a result of the assumed conversion of LP Units, by the weighted-average common shares outstanding assuming dilution. The following table shows the calculation of basic and diluted earnings per share: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Net income attributable to Summit Inc. $ 230,045 $ 86,489 $ 282,878 $ 242,310 Weighted average shares of Class A stock outstanding 118,928,799 119,753,806 118,780,523 120,196,211 Add: Nonvested restricted stock awards of retirement eligible shares 84,532 142,466 94,444 148,804 Weighted average shares outstanding 119,013,331 119,896,272 118,874,967 120,345,015 Basic earnings per share $ 1.93 $ 0.72 $ 2.38 $ 2.01 Diluted net income attributable to Summit Inc. $ 230,045 $ 86,489 $ 282,878 $ 242,310 Weighted average shares outstanding 119,013,331 119,896,272 118,874,967 120,345,015 Add: stock options 122,753 78,799 108,024 93,993 Add: warrants 15,578 10,790 13,943 12,202 Add: restricted stock units 356,286 279,684 376,221 485,174 Add: performance stock units 217,745 117,767 185,819 141,766 Weighted average dilutive shares outstanding 119,725,693 120,383,312 119,558,974 121,078,150 Diluted earnings per share $ 1.92 $ 0.72 $ 2.37 $ 2.00 Excluded from the above calculations were the shares noted below as they were antidilutive: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Antidilutive shares: LP Units 1,303,990 1,312,795 1,308,417 1,313,601

STOCKHOLDERS' EQUITY_MEMBERS' I

STOCKHOLDERS' EQUITY/MEMBERS' INTEREST	9 Months Ended
	Sep. 30, 2023
Schedule of Capitalization, Equity [Line Items]
STOCKHOLDERS' EQUITY	STOCKHOLDERS’ EQUITY During 2023, certain limited partners of Summit Holdings exchanged their LP Units for shares of Class A common stock of Summit Inc. Subsequent to September 30, 2023, an additional 345,554 LP units were exchanged for shares of Class A common stock. In March 2022, our Board of Directors authorized a share repurchase program, whereby we can repurchase up to $250 million of our Class A common stock. As of September 30, 2023, there was $149.0 million available for purchase, upon which they will be retired. The following table summarizes the changes in our ownership of Summit Holdings: Summit Inc. LP Units Total Summit Inc. Balance — December 31, 2022 118,408,655 1,312,004 119,720,659 98.9 % Exchanges during period 176,258 (176,258) — Stock option exercises 5,407 — 5,407 Other equity transactions 522,630 — 522,630 Balance — September 30, 2023 119,112,950 1,135,746 120,248,696 99.1 % Balance — January 1, 2022 120,684,322 1,314,006 121,998,328 98.9 % Exchanges during period 2,000 (2,000) — Stock option exercises 10,098 — 10,098 Repurchases of common stock (3,427,510) — (3,427,510) Other equity transactions 1,097,273 — 1,097,273 Balance — October 1, 2022 118,366,183 1,312,006 119,678,189 98.9 % 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 0.9% and 1.1% as of September 30, 2023 and December 31, 2022, respectively. Accumulated other comprehensive income (loss) —The changes in each component of accumulated other comprehensive income (loss) consisted of the following: Change in Foreign currency Accumulated Balance — December 31, 2022 $ 6,356 $ (3,272) $ 3,084 Foreign currency translation adjustment, net of tax — 212 212 Balance — September 30, 2023 $ 6,356 $ (3,060) $ 3,296 Balance — January 1, 2022 $ 1,508 $ 5,575 $ 7,083 Foreign currency translation adjustment, net of tax — (10,553) (10,553) Balance — October 1, 2022 $ 1,508 $ (4,978) $ (3,470)
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 comprehensive retirement plans adjustments (loss) income Balance — December 31, 2022 $ (762) $ (20,614) $ (21,376) Foreign currency translation adjustment — 295 295 Balance — September 30, 2023 $ (762) $ (20,319) $ (21,081) Balance — January 1, 2022 $ (7,243) $ (8,783) $ (16,026) Foreign currency translation adjustment — (14,113) (14,113) Balance — October 1, 2022 $ (7,243) $ (22,896) $ (30,139)

SUPPLEMENTAL CASH FLOW INFORMAT

SUPPLEMENTAL CASH FLOW INFORMATION	9 Months Ended
	Sep. 30, 2023
Schedule Of Cash Flow Supplemental [Line Items]
SUPPLEMENTAL CASH FLOW INFORMATION	SUPPLEMENTAL CASH FLOW INFORMATION Supplemental cash flow information is as follows: Nine months ended September 30, 2023 October 1, 2022 Cash payments: Interest $ 88,400 $ 70,184 Payments for income taxes, net 13,602 15,888 Operating cash payments on operating leases 7,578 7,112 Operating cash payments on finance leases 400 890 Finance cash payments on finance leases 6,137 13,465 Non cash investing and financing activities: Accrued liabilities for purchases of property, plant and equipment $ 22,244 $ 16,778 Right of use assets obtained in exchange for operating lease obligations 6,371 13,302 Right of use assets obtained in exchange for finance leases obligations 413 258 Exchange of LP Units to shares of Class A common stock 5,527 62
Summit Materials, LLC
Schedule Of Cash Flow Supplemental [Line Items]
SUPPLEMENTAL CASH FLOW INFORMATION	SUPPLEMENTAL CASH FLOW INFORMATION Supplemental cash flow information is as follows: Nine months ended September 30, 2023 October 1, 2022 Cash payments: Interest $ 88,400 $ 70,184 Payments for income taxes, net 13,602 15,888 Operating cash payments on operating leases 7,578 7,112 Operating cash payments on finance leases 400 890 Finance cash payments on finance leases 6,137 13,465 Non cash investing and financing activities: Accrued liabilities for purchases of property, plant and equipment $ 22,244 $ 16,778 Right of use assets obtained in exchange for operating lease obligations 6,371 13,302 Right of use assets obtained in exchange for finance leases obligations 413 258

LEASES

LEASES	9 Months Ended
	Sep. 30, 2023
Lessee, Lease, Description [Line Items]
LEASES	LEASES We lease construction and office equipment, distribution facilities and office space. Leases with an initial term of 12 months or less, including month to month leases, are not recorded on the balance sheet. Lease expense for short-term leases is recognized on a straight line basis over the lease term. For lease agreements we have entered into or reassessed, we combine lease and nonlease components. While we also own mineral leases for mining operations, those leases are outside the scope of Accounting Standards Update No. 2016-2, Leases (Topic 842). Assets acquired under finance leases are included in property, plant and equipment. Many of our leases include options to purchase the leased equipment. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579
LEASES	LEASES We lease construction and office equipment, distribution facilities and office space. Leases with an initial term of 12 months or less, including month to month leases, are not recorded on the balance sheet. Lease expense for short-term leases is recognized on a straight line basis over the lease term. For lease agreements we have entered into or reassessed, we combine lease and nonlease components. While we also own mineral leases for mining operations, those leases are outside the scope of Accounting Standards Update No. 2016-2, Leases (Topic 842). Assets acquired under finance leases are included in property, plant and equipment. Many of our leases include options to purchase the leased equipment. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579
Summit Materials, LLC
Lessee, Lease, Description [Line Items]
LEASES	LEASES We lease construction and office equipment, distribution facilities and office space. Leases with an initial term of 12 months or less, including month to month leases, are not recorded on the balance sheet. Lease expense for short-term leases is recognized on a straight line basis over the lease term. For lease agreements we have entered into or reassessed, we combine lease and nonlease components. While we also own mineral leases for mining operations, those leases are outside the scope of Accounting Standards Update No. 2016-2, Leases (Topic 842). Assets acquired under finance leases are included in property, plant and equipment. Many of our leases include options to purchase the leased equipment. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579
LEASES	LEASES We lease construction and office equipment, distribution facilities and office space. Leases with an initial term of 12 months or less, including month to month leases, are not recorded on the balance sheet. Lease expense for short-term leases is recognized on a straight line basis over the lease term. For lease agreements we have entered into or reassessed, we combine lease and nonlease components. While we also own mineral leases for mining operations, those leases are outside the scope of Accounting Standards Update No. 2016-2, Leases (Topic 842). Assets acquired under finance leases are included in property, plant and equipment. Many of our leases include options to purchase the leased equipment. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2023
Loss Contingencies [Line Items]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES The Company is party to certain legal actions arising from the ordinary course of business activities. Accruals are recorded when the outcome is probable and can be reasonably estimated. While the ultimate results of claims and litigation cannot be predicted with certainty, management expects that the ultimate resolution of all current pending or threatened claims and litigation will not have a material effect on the Company’s consolidated financial position, results of operations or liquidity. The Company records legal fees as incurred. In March 2018, we were notified of an investigation by the Canadian Competition Bureau (the “CCB”) into pricing practices by certain asphalt paving contractors in British Columbia, including Winvan Paving, Ltd. (“Winvan”). We believe the investigation is focused on time periods prior to our April 2017 acquisition of Winvan and we are cooperating with the CCB. Although we currently do not believe this matter will have a material adverse effect on our business, financial condition or results of operations, we are currently not able to predict the ultimate outcome or cost of the investigation. Environmental Remediation and Site Restoration —The Company’s operations are subject to and affected by federal, state, provincial and local laws and regulations relating to the environment, health and safety and other regulatory matters. These operations require environmental operating permits, which are subject to modification, renewal and revocation. The Company regularly monitors and reviews its operations, procedures and policies for compliance with these laws and regulations. Despite these compliance efforts, risk of environmental liability is inherent in the operation of the Company’s business, as it is with other companies engaged in similar businesses and there can be no assurance that environmental liabilities or noncompliance will not have a material adverse effect on the Company’s consolidated financial condition, results of operations or liquidity. The Company has asset retirement obligations arising from regulatory and contractual requirements to perform reclamation activities at the time certain quarries and landfills are closed. As of September 30, 2023 and December 31, 2022, $36.3 million and $36.3 million, respectively, were included in other noncurrent liabilities on the consolidated balance sheets and $5.3 million and $4.0 million, respectively, were included in accrued expenses for future reclamation costs. The total undiscounted anticipated costs for site reclamation as of September 30, 2023 and December 31, 2022 were $123.1 million and $124.9 million, respectively. Other —The Company is obligated under various firm purchase commitments for certain raw materials and services that are in the ordinary course of business. Management does not expect any significant changes in the market value of these goods and services during the commitment period that would have a material adverse effect on the financial condition, results of operations and cash flows of the Company. The terms of the purchase commitments generally approximate one year.
Summit Materials, LLC
Loss Contingencies [Line Items]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES The Company is party to certain legal actions arising from the ordinary course of business activities. Accruals are recorded when the outcome is probable and can be reasonably estimated. While the ultimate results of claims and litigation cannot be predicted with certainty, management expects that the ultimate resolution of all current pending or threatened claims and litigation will not have a material effect on the Company’s consolidated financial position, results of operations or liquidity. The Company records legal fees as incurred. In March 2018, we were notified of an investigation by the Canadian Competition Bureau (the “CCB”) into pricing practices by certain asphalt paving contractors in British Columbia, including Winvan Paving, Ltd. (“Winvan”). We believe the investigation is focused on time periods prior to our April 2017 acquisition of Winvan and we are cooperating with the CCB. Although we currently do not believe this matter will have a material adverse effect on our business, financial condition or results of operations, we are currently not able to predict the ultimate outcome or cost of the investigation. Environmental Remediation and Site Restoration —The Company’s operations are subject to and affected by federal, state, provincial and local laws and regulations relating to the environment, health and safety and other regulatory matters. These operations require environmental operating permits, which are subject to modification, renewal and revocation. The Company regularly monitors and reviews its operations, procedures and policies for compliance with these laws and regulations. Despite these compliance efforts, risk of environmental liability is inherent in the operation of the Company’s business, as it is with other companies engaged in similar businesses and there can be no assurance that environmental liabilities or noncompliance will not have a material adverse effect on the Company’s consolidated financial condition, results of operations or liquidity. The Company has asset retirement obligations arising from regulatory and contractual requirements to perform reclamation activities at the time certain quarries and landfills are closed. As of September 30, 2023 and December 31, 2022, $36.3 million and $36.3 million, respectively, were included in other noncurrent liabilities on the consolidated balance sheets and $5.3 million and $4.0 million, respectively, were included in accrued expenses for future reclamation costs. The total undiscounted anticipated costs for site reclamation as of September 30, 2023 and December 31, 2022 were $123.1 million and $124.9 million, respectively. Other —The Company is obligated under various firm purchase commitments for certain raw materials and services that are in the ordinary course of business. Management does not expect any significant changes in the market value of these goods and services during the commitment period that would have a material adverse effect on the financial condition, results of operations and cash flows of the Company. The terms of the purchase commitments generally approximate one year.

FAIR VALUE

FAIR VALUE	9 Months Ended
	Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FAIR VALUE	FAIR VALUE Fair Value Measurements— Certain acquisitions made by the Company require the payment of contingent amounts of purchase consideration. These payments are contingent on specified operating results being achieved in periods subsequent to the acquisition and will only be made if earn-out thresholds are achieved. Contingent consideration obligations are measured at fair value each reporting period. Any adjustments to fair value are recognized in earnings in the period identified. The fair value of contingent consideration as of September 30, 2023 and December 31, 2022 was: September 30, 2023 December 31, 2022 Current portion of acquisition-related liabilities and Accrued expenses: Contingent consideration $ 139 $ 336 Acquisition-related liabilities and Other noncurrent liabilities: Contingent consideration $ 9,296 $ 4,981 The fair value of contingent consideration was based on unobservable, or Level 3, inputs, including projected probability-weighted cash payments and a 10.0% discount rate, which reflects a market discount rate. Changes in fair value may occur as a result of a change in actual or projected cash payments, the probability weightings applied by the Company to projected payments or a change in the discount rate. Significant increases or decreases in any of these inputs in isolation could result in a lower, or higher, fair value measurement. There were no material valuation adjustments to contingent consideration as of September 30, 2023 and October 1, 2022. Financial Instruments —The Company’s financial instruments include debt and certain acquisition-related liabilities (deferred consideration and noncompete obligations). The carrying value and fair value of these financial instruments as of September 30, 2023 and December 31, 2022 was: September 30, 2023 December 31, 2022 Fair Value Carrying Value Fair Value Carrying Value Level 1 Long-term debt(1) $ 1,434,238 $ 1,501,492 $ 1,447,673 $ 1,504,549 Level 3 Current portion of deferred consideration and noncompete obligations(2) 6,889 6,889 13,382 13,382 Long term portion of deferred consideration and noncompete obligations(3) 18,337 18,337 24,070 24,070 (1) $3.8 million and $5.1 million was included in current portion of debt as of September 30, 2023 and December 31, 2022, respectively. (2) Included in current portion of acquisition-related liabilities on the consolidated balance sheets. (3) Included in acquisition-related liabilities on the consolidated balance sheets. The fair value of debt was determined based on observable, or Level 1, inputs, such as interest rates, bond yields and quoted prices in inactive markets. The fair values of the deferred consideration and noncompete obligations were determined based on unobservable, or Level 3, inputs, including the cash payment terms in the purchase agreements and a discount rate reflecting the Company’s credit risk. The discount rate used is generally consistent with that used when the obligations were initially recorded. Securities with a maturity of three months or less are considered cash equivalents and the fair value of these assets approximates their carrying value.
Summit Materials, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FAIR VALUE	FAIR VALUE Fair Value Measurements— Certain acquisitions made by the Company require the payment of contingent amounts of purchase consideration. These payments are contingent on specified operating results being achieved in periods subsequent to the acquisition and will only be made if earn-out thresholds are achieved. Contingent consideration obligations are measured at fair value each reporting period. Any adjustments to fair value are recognized in earnings in the period identified. The fair value of contingent consideration as of September 30, 2023 and December 31, 2022 was: September 30, 2023 December 31, 2022 Current portion of acquisition-related liabilities and Accrued expenses: Contingent consideration $ 139 $ 336 Acquisition-related liabilities and Other noncurrent liabilities: Contingent consideration $ 9,296 $ 4,981 The fair value of contingent consideration was based on unobservable, or Level 3, inputs, including projected probability-weighted cash payments and a 10.0% discount rate, which reflects a market discount rate. Changes in fair value may occur as a result of a change in actual or projected cash payments, the probability weightings applied by the Company to projected payments or a change in the discount rate. Significant increases or decreases in any of these inputs in isolation could result in a lower, or higher, fair value measurement. There were no material valuation adjustments to contingent consideration as of September 30, 2023 and October 1, 2022. Financial Instruments —The Company’s financial instruments include debt and certain acquisition-related liabilities (deferred consideration and noncompete obligations). The carrying value and fair value of these financial instruments as of September 30, 2023 and December 31, 2022 was: September 30, 2023 December 31, 2022 Fair Value Carrying Value Fair Value Carrying Value Level 1 Long-term debt(1) $ 1,434,238 $ 1,501,492 $ 1,447,673 $ 1,504,549 Level 3 Current portion of deferred consideration and noncompete obligations(2) 6,889 6,889 13,382 13,382 Long term portion of deferred consideration and noncompete obligations(3) 18,337 18,337 24,070 24,070 (1) $3.8 million and $5.1 million was included in current portion of debt as of September 30, 2023 and December 31, 2022, respectively. (2) Included in current portion of acquisition-related liabilities on the consolidated balance sheets. (3) Included in acquisition-related liabilities on the consolidated balance sheets. The fair value of debt was determined based on observable, or Level 1, inputs, such as interest rates, bond yields and quoted prices in inactive markets. The fair values of the deferred consideration and noncompete obligations were determined based on unobservable, or Level 3, inputs, including the cash payment terms in the purchase agreements and a discount rate reflecting the Company’s credit risk. The discount rate used is generally consistent with that used when the obligations were initially recorded. Securities with a maturity of three months or less are considered cash equivalents and the fair value of these assets approximates their carrying value.

SEGMENT INFORMATION

SEGMENT INFORMATION	9 Months Ended
	Sep. 30, 2023
Segment Reporting Information [Line Items]
SEGMENT INFORMATION	SEGMENT INFORMATION The Company has three operating segments: West, East and Cement, which are its reporting segments. These segments are consistent with the Company’s management reporting structure. The operating results of each segment are regularly reviewed and evaluated by the Chief Executive Officer, our Company’s Chief Operating Decision Maker (“CODM”). The CODM primarily evaluates the performance of the Company’s segments and allocates resources to them based on a segment profit metric that we call Adjusted EBITDA, which is computed as earnings from operations before interest, taxes, depreciation, depletion, amortization, accretion and share-based compensation, as well as various other non-recurring, non-cash amounts. The West and East segments have several subsidiaries that are engaged in various activities including quarry mining, aggregate production and contracting. The Cement segment is engaged in the production of Portland cement. Assets employed by each segment include assets directly identified with those operations. Corporate assets consist primarily of cash, property, plant and equipment for corporate operations and other assets not directly identifiable with a reportable business segment. The accounting policies applicable to each segment are consistent with those used in the consolidated financial statements. The following tables display selected financial data for the Company’s reportable business segments as of September 30, 2023 and December 31, 2022 and for the three and nine months ended September 30, 2023 and October 1, 2022: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Revenue*: West $ 496,638 $ 439,411 $ 1,178,258 $ 1,075,393 East 176,840 193,421 493,766 525,064 Cement 121,319 119,915 287,311 259,791 Total revenue $ 794,797 $ 752,747 $ 1,959,335 $ 1,860,248 *Intercompany sales are immaterial and the presentation above only reflects sales to external customers. Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Income from operations before taxes $ 256,633 $ 112,480 $ 326,164 $ 319,650 Interest expense 28,013 21,980 83,335 62,728 Depreciation, depletion and amortization 56,691 51,439 160,921 148,373 Accretion 761 694 2,212 2,110 Loss on debt financings — — 493 — Tax receivable agreement (benefit) expense (153,080) — (153,080) 954 Gain on sale of businesses — (4,115) — (174,373) Non-cash compensation 5,192 4,902 15,116 15,058 Argos USA acquisition and integration costs 17,859 — 17,859 — Other (3,550) (2,492) (11,555) (2,315) Total Adjusted EBITDA $ 208,519 $ 184,888 $ 441,465 $ 372,185 Total Adjusted EBITDA by Segment: West $ 117,846 $ 98,281 $ 255,041 $ 215,617 East 50,089 44,119 116,558 98,949 Cement 50,355 46,597 103,237 84,019 Corporate and other (9,771) (4,109) (33,371) (26,400) Total Adjusted EBITDA $ 208,519 $ 184,888 $ 441,465 $ 372,185 Nine months ended September 30, 2023 October 1, 2022 Purchases of property, plant and equipment West $ 98,025 $ 85,462 East 45,754 65,116 Cement 28,914 30,503 Total reportable segments 172,693 181,081 Corporate and other 9,489 7,927 Total purchases of property, plant and equipment $ 182,182 $ 189,008 Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Depreciation, depletion, amortization and accretion: West $ 28,701 $ 24,908 $ 83,218 $ 71,495 East 15,586 15,445 46,839 48,655 Cement 12,143 10,959 30,032 27,993 Total reportable segments 56,430 51,312 160,089 148,143 Corporate and other 1,022 821 3,044 2,340 Total depreciation, depletion, amortization and accretion $ 57,452 $ 52,133 $ 163,133 $ 150,483 September 30, 2023 December 31, 2022 Total assets: West $ 1,932,418 $ 1,565,776 East 1,191,237 1,151,223 Cement 914,416 873,604 Total reportable segments 4,038,071 3,590,603 Corporate and other 326,893 665,089 Total $ 4,364,964 $ 4,255,692
Summit Materials, LLC
Segment Reporting Information [Line Items]
SEGMENT INFORMATION	SEGMENT INFORMATION The Company has three operating segments: West, East and Cement, which are its reporting segments. These segments are consistent with the Company’s management reporting structure. The operating results of each segment are regularly reviewed and evaluated by the Chief Executive Officer, our Company’s Chief Operating Decision Maker (“CODM”). The CODM primarily evaluates the performance of the Company’s segments and allocates resources to them based on a segment profit metric that we call Adjusted EBITDA, which is computed as earnings from operations before interest, taxes, depreciation, depletion, amortization, accretion and share-based compensation, as well as various other non-recurring, non-cash amounts. The West and East segments have several subsidiaries that are engaged in various activities including quarry mining, aggregate production and contracting. The Cement segment is engaged in the production of Portland cement. Assets employed by each segment include assets directly identified with those operations. Corporate assets consist primarily of cash, property, plant and equipment for corporate operations and other assets not directly identifiable with a reportable business segment. The accounting policies applicable to each segment are consistent with those used in the consolidated financial statements. The following tables display selected financial data for the Company’s reportable business segments as of September 30, 2023 and December 31, 2022 and for the three and nine months ended September 30, 2023 and October 1, 2022: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Revenue*: West $ 496,638 $ 439,411 $ 1,178,258 $ 1,075,393 East 176,840 193,421 493,766 525,064 Cement 121,319 119,915 287,311 259,791 Total revenue $ 794,797 $ 752,747 $ 1,959,335 $ 1,860,248 *Intercompany sales are immaterial and the presentation above only reflects sales to external customers. Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Income from operations before taxes $ 103,551 $ 112,480 $ 173,082 $ 320,604 Interest expense 28,013 21,980 83,335 62,728 Depreciation, depletion and amortization 56,691 51,439 160,921 148,373 Accretion 761 694 2,212 2,110 Loss on debt financings — — 493 — Gain on sale of businesses — (4,115) — (174,373) Non-cash compensation 5,192 4,902 15,116 15,058 Argos USA acquisition and integration costs 17,859 — 17,859 — Other (3,548) (2,492) (11,553) (2,315) Total Adjusted EBITDA $ 208,519 $ 184,888 $ 441,465 $ 372,185 Total Adjusted EBITDA by Segment: West $ 117,846 $ 98,281 $ 255,041 $ 215,617 East 50,089 44,119 116,558 98,949 Cement 50,355 46,597 103,237 84,019 Corporate and other (9,771) (4,109) (33,371) (26,400) Total Adjusted EBITDA $ 208,519 $ 184,888 $ 441,465 $ 372,185 Nine months ended September 30, 2023 October 1, 2022 Purchases of property, plant and equipment West $ 98,025 $ 85,462 East 45,754 65,116 Cement 28,914 30,503 Total reportable segments 172,693 181,081 Corporate and other 9,489 7,927 Total purchases of property, plant and equipment $ 182,182 $ 189,008 Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Depreciation, depletion, amortization and accretion: West $ 28,701 $ 24,908 $ 83,218 $ 71,495 East 15,586 15,445 46,839 48,655 Cement 12,143 10,959 30,032 27,993 Total reportable segments 56,430 51,312 160,089 148,143 Corporate and other 1,022 821 3,044 2,340 Total depreciation, depletion, amortization and accretion $ 57,452 $ 52,133 $ 163,133 $ 150,483 September 30, 2023 December 31, 2022 Total assets: West $ 1,932,418 $ 1,565,776 East 1,191,237 1,151,223 Cement 914,416 873,604 Total reportable segments 4,038,071 3,590,603 Corporate and other 332,987 529,103 Total $ 4,371,058 $ 4,119,706

GUARANTOR AND NON-GUARANTOR FIN

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION	9 Months Ended
	Sep. 30, 2023
Summit Materials, LLC
Guarantor and Non-Guarantor Financial Information	GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION Summit LLC’s domestic wholly-owned subsidiary companies other than Finance Corp. are named as guarantors (collectively, the “Guarantors”) of the Senior Notes. Finance Corp. does not and will not have any assets or operations other than as may be incidental to its activities as a co-issuer of the Senior Notes and other indebtedness. Certain other partially-owned subsidiaries and a non-U.S. entity do not guarantee the Senior Notes (collectively, the “Non-Guarantors”). The Guarantors provide a joint and several, full and unconditional guarantee of the Senior Notes. There are no significant restrictions on Summit LLC’s ability to obtain funds from any of the Guarantors in the form of dividends or loans. Additionally, there are no significant restrictions on a Guarantor’s ability to obtain funds from Summit LLC or its direct or indirect subsidiaries. The following condensed consolidating balance sheets, statements of operations and cash flows are provided for the Issuers, the Guarantors and the Non-Guarantors. Earnings from subsidiaries are included in other income in the condensed consolidated statements of operations below. The financial information may not necessarily be indicative of the financial position, results of operations or cash flows had the Guarantors or Non-Guarantors operated as independent entities. Condensed Consolidating Balance Sheets September 30, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 169,370 $ 3,556 $ 33,135 $ (13,065) $ 192,996 Accounts receivable, net 2,232 341,351 32,478 (132) 375,929 Intercompany receivables 302,181 2,152,362 — (2,454,543) — Cost and estimated earnings in excess of billings — 39,746 1,239 — 40,985 Inventories — 236,913 6,223 — 243,136 Other current assets 12,896 9,848 1,334 — 24,078 Total current assets 486,679 2,783,776 74,409 (2,467,740) 877,124 Property, plant and equipment, net 31,982 1,865,176 77,374 — 1,974,532 Goodwill — 1,185,739 56,733 — 1,242,472 Intangible assets, net — 64,486 4,328 — 68,814 Operating lease right-of-use assets 3,987 30,048 4,345 — 38,380 Other assets 5,301,038 220,772 774 (5,352,848) 169,736 Total assets $ 5,823,686 $ 6,149,997 $ 217,963 $ (7,820,588) $ 4,371,058 Liabilities and Members' Interest Current liabilities: Current portion of debt $ 3,822 $ — $ — $ — $ 3,822 Current portion of acquisition-related liabilities — 7,028 — — 7,028 Accounts payable 6,524 155,276 11,314 (132) 172,982 Accrued expenses 62,279 94,833 4,058 (13,065) 148,105 Current operating lease liabilities 910 7,276 559 — 8,745 Intercompany payables 1,942,556 509,873 2,114 (2,454,543) — Billings in excess of costs and estimated earnings — 7,480 1,059 — 8,539 Total current liabilities 2,016,091 781,766 19,104 (2,467,740) 349,221 Long-term debt 1,488,069 — — — 1,488,069 Acquisition-related liabilities — 27,633 — — 27,633 Noncurrent operating lease liabilities 8,135 23,041 3,662 — 34,838 Other noncurrent liabilities 5,289 207,728 116,599 (164,421) 165,195 Total liabilities 3,517,584 1,040,168 139,365 (2,632,161) 2,064,956 Total members' interest 2,306,102 5,109,829 78,598 (5,188,427) 2,306,102 Total liabilities and members' interest $ 5,823,686 $ 6,149,997 $ 217,963 $ (7,820,588) $ 4,371,058 Condensed Consolidating Balance Sheets December 31, 2022 Non- Issuers Guarantors Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 498,307 $ 2,864 $ 26,298 $ (7,018) $ 520,451 Accounts receivable, net 1,528 233,039 22,127 (25) 256,669 Intercompany receivables 329,744 1,937,390 — (2,267,134) — Cost and estimated earnings in excess of billings — 5,861 649 — 6,510 Inventories — 206,418 6,073 — 212,491 Other current assets 4,755 16,341 1,159 — 22,255 Total current assets 834,334 2,401,913 56,306 (2,274,177) 1,018,376 Property, plant and equipment, net 21,306 1,710,972 81,424 — 1,813,702 Goodwill — 1,076,935 56,611 — 1,133,546 Intangible assets, net — 66,972 4,412 — 71,384 Operating lease right-of-use assets 4,665 28,310 4,914 — 37,889 Other assets 4,599,488 204,644 1,220 (4,760,543) 44,809 Total assets $ 5,459,793 $ 5,489,746 $ 204,887 $ (7,034,720) $ 4,119,706 Liabilities and Members' Interest Current liabilities: Current portion of debt $ 5,096 $ — $ — $ — $ 5,096 Current portion of acquisition-related liabilities — 13,718 — — 13,718 Accounts payable 3,553 93,096 7,806 (25) 104,430 Accrued expenses 54,417 70,433 2,876 (7,018) 120,708 Current operating lease liabilities 921 5,637 738 — 7,296 Intercompany payables 1,750,352 513,494 3,288 (2,267,134) — Billings in excess of costs and estimated earnings — 4,956 783 — 5,739 Total current liabilities 1,814,339 701,334 15,491 (2,274,177) 256,987 Long-term debt 1,488,569 — — — 1,488,569 Acquisition-related liabilities — 29,051 — — 29,051 Noncurrent operating lease liabilities 8,726 22,871 4,140 — 35,737 Other noncurrent liabilities 5,009 208,185 117,439 (164,421) 166,212 Total liabilities 3,316,643 961,441 137,070 (2,438,598) 1,976,556 Total members' interest 2,143,150 4,528,305 67,817 (4,596,122) 2,143,150 Total liabilities and members' interest $ 5,459,793 $ 5,489,746 $ 204,887 $ (7,034,720) $ 4,119,706 Condensed Consolidating Statements of Operations For the three months ended September 30, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 759,491 $ 36,792 $ (1,486) $ 794,797 Cost of revenue (excluding items shown separately below) — 519,059 25,586 (1,486) 543,159 General and administrative expenses 33,073 31,548 1,582 — 66,203 Depreciation, depletion, amortization and accretion 1,022 53,779 2,651 — 57,452 Operating (loss) income (34,095) 155,105 6,973 — 127,983 Other income, net (171,236) (106) (553) 168,314 (3,581) Interest expense (income) 41,642 (15,002) 1,373 — 28,013 Income from operation before taxes 95,499 170,213 6,153 (168,314) 103,551 Income tax expense 399 6,407 1,645 — 8,451 Net income attributable to Summit LLC $ 95,100 $ 163,806 $ 4,508 $ (168,314) $ 95,100 Comprehensive income attributable to member of Summit Materials, LLC $ 91,290 $ 163,806 $ 8,318 $ (172,124) $ 91,290 Condensed Consolidating Statements of Operations For the nine months ended September 30, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 1,863,825 $ 99,354 $ (3,844) $ 1,959,335 Cost of revenue (excluding items shown separately below) — 1,324,138 69,305 (3,844) 1,389,599 General and administrative expenses 66,947 92,502 5,013 — 164,462 Depreciation, depletion, amortization and accretion 3,044 151,850 8,239 — 163,133 Operating (loss) income (69,991) 295,335 16,797 — 242,141 Other income, net (351,086) (1,653) (1,662) 340,125 (14,276) Interest expense (income) 121,917 (42,695) 4,113 — 83,335 Income from operation before taxes 159,178 339,683 14,346 (340,125) 173,082 Income tax expense 1,199 10,043 3,861 — 15,103 Net income attributable to Summit LLC $ 157,979 $ 329,640 $ 10,485 $ (340,125) $ 157,979 Comprehensive income attributable to member of Summit Materials, LLC $ 158,274 $ 329,640 $ 10,190 $ (339,830) $ 158,274 Condensed Consolidating Statements of Operations For the three months ended October 1, 2022 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 718,510 $ 37,112 $ (2,875) $ 752,747 Cost of revenue (excluding items shown separately below) — 511,848 25,963 (2,875) 534,936 General and administrative expenses 9,138 27,717 1,761 — 38,616 Depreciation, depletion, amortization and accretion 822 48,442 2,869 — 52,133 Operating (loss) income (9,960) 130,503 6,519 — 127,062 Other income, net (147,353) (399) (106) 144,575 (3,283) Interest expense (income) 35,536 (14,926) 1,370 — 21,980 (Gain) loss on sale of business (5,120) 1,005 — — (4,115) Income from operation before taxes 106,977 144,823 5,255 (144,575) 112,480 Income tax expense 1,644 4,119 1,384 — 7,147 Net income attributable to Summit LLC $ 105,333 $ 140,704 $ 3,871 $ (144,575) $ 105,333 Comprehensive income attributable to member of Summit Materials, LLC $ 95,086 $ 140,704 $ 14,118 $ (154,822) $ 95,086 Condensed Consolidating Statements of Operations For the nine months ended October 1, 2022 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 1,770,642 $ 97,972 $ (8,366) $ 1,860,248 Cost of revenue (excluding items shown separately below) — 1,310,495 70,392 (8,366) 1,372,521 General and administrative expenses 42,360 85,816 5,065 — 133,241 Depreciation, depletion, amortization and accretion 2,341 139,280 8,862 — 150,483 Operating (loss) income (44,701) 235,051 13,653 — 204,003 Other income, net (320,069) (1,384) (17) 316,514 (4,956) Interest expense (income) 103,017 (44,399) 4,110 — 62,728 Gain on sale of business (131,721) (42,652) — — (174,373) Income from operation before taxes 304,072 323,486 9,560 (316,514) 320,604 Income tax expense 3,025 13,985 2,547 — 19,557 Net income attributable to Summit LLC $ 301,047 $ 309,501 $ 7,013 $ (316,514) $ 301,047 Comprehensive income attributable to member of Summit Materials, LLC $ 286,934 $ 309,501 $ 21,126 $ (330,627) $ 286,934 Condensed Consolidating Statements of Cash Flows For the nine months ended September 30, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Net cash (used in) provided by operating activities $ (124,375) $ 352,592 $ 15,406 $ — $ 243,623 Cash flow from investing activities: Acquisitions, net of cash acquired — (239,508) — — (239,508) Purchase of property, plant and equipment (9,490) (168,843) (3,849) — (182,182) Proceeds from the sale of property, plant, and equipment — 9,265 495 — 9,760 Other — (3,602) — — (3,602) Net cash used in investing activities (9,490) (402,688) (3,354) — (415,532) Cash flow from financing activities: Capital distributions to member (240,992) 241,104 — — 112 Loans received from and payments made on loans from other Summit Companies 181,538 (170,376) (5,115) (6,047) — Payments on long-term debt (3,822) (4,698) — — (8,520) Cash paid for tax receivable agreement interests (122,935) — — — (122,935) Payments on acquisition-related liabilities — (12,203) — — (12,203) Debt issuance costs (1,566) — — — (1,566) Distributions from partnership (4,538) — — — (4,538) Other (2,757) (3,039) (215) — (6,011) Net cash (used in) provided by financing activities (195,072) 50,788 (5,330) (6,047) (155,661) Impact of cash on foreign currency — — 115 — 115 Net (decrease) increase in cash (328,937) 692 6,837 (6,047) (327,455) Cash — Beginning of period 498,307 2,864 26,298 (7,018) 520,451 Cash — End of period $ 169,370 $ 3,556 $ 33,135 $ (13,065) $ 192,996 Condensed Consolidating Statements of Cash Flows For the nine months ended October 1, 2022 Non- Issuers Guarantors Guarantors Eliminations Consolidated Net cash (used in) provided by operating activities $ (109,265) $ 225,563 $ 15,282 $ — $ 131,580 Cash flow from investing activities: Acquisitions, net of cash acquired — (1,933) — — (1,933) Purchase of property, plant and equipment (7,927) (177,028) (4,053) — (189,008) Proceeds from the sale of property, plant, and equipment — 8,033 265 — 8,298 Proceeds from the sale of a business 5,924 367,866 — — 373,790 Other — (2,214) — — (2,214) Net cash (used in) provided by investing activities (2,003) 194,724 (3,788) — 188,933 Cash flow from financing activities: Capital distributions to member (102,713) 1,932 — — (100,781) Loans received from and payments made on loans from other Summit Companies 402,030 (396,330) (5,448) (252) — Payments on long-term debt (100,400) (13,369) — — (113,769) Payments on acquisition-related liabilities — (12,964) — — (12,964) Distributions from partnership (34,155) — — — (34,155) Other (754) (20) — — (774) Net cash provided by (used in) financing activities 164,008 (420,751) (5,448) (252) (262,443) Impact of cash on foreign currency — — (1,732) — (1,732) Net increase (decrease) in cash 52,740 (464) 4,314 (252) 56,338 Cash — Beginning of period 365,044 2,264 18,337 (4,684) 380,961 Cash — End of period $ 417,784 $ 1,800 $ 22,651 $ (4,936) $ 437,299

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 230,045	$ 86,489	$ 282,878	$ 242,310

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

SUMMARY OF ORGANIZATION AND S_2

SUMMARY OF ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 30, 2023
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Basis of Presentation	Basis of Presentation —These unaudited consolidated financial statements were prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures typically included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. These unaudited consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and the notes thereto as of and for the year ended December 31, 2022. The Company continues to follow the accounting policies set forth in those audited consolidated financial statements. Management believes that these consolidated interim financial statements include all adjustments, normal and recurring in nature, that are necessary to present fairly the financial position of the Company as of September 30, 2023, the results of operations for the three and nine months ended September 30, 2023 and October 1, 2022 and cash flows for the nine months ended September 30, 2023 and October 1, 2022.
Principles of Consolidation	Principles of Consolidation —The consolidated financial statements include the accounts of Summit Inc. and its majority owned subsidiaries. All intercompany balances and transactions have been eliminated. For a summary of the changes in Summit Inc.’s ownership of Summit Holdings, see Note 9, Stockholders’ Equity.
Use of Estimates	Use of Estimates —Preparation of these consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and reported amounts of revenue and expenses. Such estimates include the valuation of accounts receivable, inventories, valuation of deferred tax assets, goodwill, intangibles and other long-lived assets, tax receivable agreement ("TRA") liability, pension and other postretirement obligations and asset retirement obligations. Estimates also include revenue earned on contracts and costs to complete contracts. Most of the Company’s paving and related services are performed under fixed unit-price contracts with state and local governmental entities. Management regularly evaluates its estimates and assumptions based on historical experience and other factors, including the current economic environment. As future events and their effects cannot be determined with precision, actual results can differ significantly from estimates made. Changes in estimates, including
Business and Credit Concentrations	Business and Credit Concentrations—The Company’s operations are conducted primarily across 21 U.S. states and in British Columbia, Canada, with the most significant revenue generated in Texas, Utah, Kansas and Missouri. The Company’s accounts receivable consist primarily of amounts due from customers within these areas. Therefore, collection of these accounts is dependent on the economic conditions in the aforementioned states, as well as specific situations affecting individual customers. Credit granted within the Company’s trade areas has been granted to many customers, and management does not believe that a significant concentration of credit exists with respect to any individual customer or group of customers.
Revenue Recognition	Revenue Recognition— We earn revenue from the sale of products, which primarily include aggregates, cement, ready-mix concrete and asphalt, but also include concrete products and plastics components, and from the provision of services, which are primarily paving and related services, but also include landfill operations, the receipt and disposal of waste that is converted to fuel for use in our cement plants. Products: Revenue for product sales is recognized when the performance obligation is satisfied, which generally is when the product is shipped. Services: We earn revenue from the provision of services, which are primarily paving and related services, which are typically calculated using monthly progress based on a method similar to percentage of completion or a customer’s engineer review of progress. The majority of our construction service contracts are completed within one year, but may occasionally extend beyond this time frame. The majority of our construction service contracts are for work that occurs mostly during the spring, summer and fall. We generally measure progress toward completion on long-term paving and related services contracts based on the proportion of costs incurred to date relative to total estimated costs at completion. Estimating costs to be incurred for revenue recognition involves the use of various estimating techniques to project costs at completion, and in some cases includes estimates of recoveries asserted against the customer for changes in specifications or other disputes.
Earnings per Share	Earnings per Share— The Company computes basic earnings per share attributable to stockholders by dividing income attributable to Summit Inc. by the weighted-average shares of Class A common stock outstanding. Diluted earnings per share reflects the potential dilution beyond shares for basic earnings per share that could occur if securities or other contracts to issue common stock were exercised, converted into common stock, or resulted in the issuance of common stock that would have shared in the Company’s earnings. Since the Class B common stock has no economic value, those shares are not included in the weighted-average common share amount for basic or diluted earnings per share. In addition, as the shares of Class A common stock are issued by Summit Inc., the earnings and equity interests of noncontrolling interests are not included in basic earnings per share.
Leases	We lease construction and office equipment, distribution facilities and office space. Leases with an initial term of 12 months or less, including month to month leases, are not recorded on the balance sheet. Lease expense for short-term leases is recognized on a straight line basis over the lease term. For lease agreements we have entered into or reassessed, we combine lease and nonlease components. While we also own mineral leases for mining operations, those leases are outside the scope of Accounting Standards Update No. 2016-2, Leases (Topic 842). Assets acquired under finance leases are included in property, plant and equipment.Many of our leases include options to purchase the leased equipment. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants.
Summit Materials, LLC
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Basis of Presentation	Basis of Presentation —These unaudited consolidated financial statements were prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures typically included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. These unaudited consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto as of and for the year ended December 31, 2022. The Company continues to follow the accounting policies set forth in those audited consolidated financial statements. Management believes that these consolidated interim financial statements include all adjustments, normal and recurring in nature, that are necessary to present fairly the financial position of the Company as of September 30, 2023, the results of operations for the three and nine months ended September 30, 2023 and October 1, 2022 and cash flows for the nine months ended September 30, 2023 and October 1, 2022.
Use of Estimates	Use of Estimates —Preparation of these consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and reported amounts of revenue and expenses. Such estimates include the valuation of accounts receivable, inventories, valuation of deferred tax assets, goodwill, intangibles and other long-lived assets, tax receivable agreement ("TRA") asset, pension and other postretirement obligations and asset retirement obligations. Estimates also include revenue earned on contracts and costs to complete contracts. Most of the Company’s paving and related services are performed under fixed unit-price contracts with state and local governmental entities. Management regularly evaluates its estimates and assumptions based on historical experience and other factors, including the current economic environment. As future events and their effects cannot be determined with precision, actual results can differ significantly from estimates made. Changes in estimates, including those resulting from continuing changes in the economic environment, are reflected in the Company’s consolidated financial statements when the change in estimate occurs.
Business and Credit Concentrations	Business and Credit Concentrations— The Company’s operations are conducted primarily across 21 U.S. states and in British Columbia, Canada, with the most significant revenue generated in Texas, Utah, Kansas and Missouri. The Company’s accounts receivable consist primarily of amounts due from customers within these areas. Therefore, collection of these accounts is dependent on the economic conditions in the aforementioned states, as well as specific situations affecting individual customers. Credit granted within the Company’s trade areas has been granted to many customers, and management does not
Revenue Recognition	Revenue Recognition— We earn revenue from the sale of products, which primarily include aggregates, cement, ready-mix concrete and asphalt, but also include concrete products and plastics components, and from the provision of services, which are primarily paving and related services, but also include landfill operations, the receipt and disposal of waste that is converted to fuel for use in our cement plants. Products: Revenue for product sales is recognized when the performance obligation is satisfied, which generally is when the product is shipped. Services: We earn revenue from the provision of services, which are primarily paving and related services, which are typically calculated using monthly progress based on a method similar to percentage of completion or a customer’s engineer review of progress. The majority of our construction service contracts are completed within one year, but may occasionally extend beyond this time frame. The majority of our construction service contracts are for work that occurs mostly during the spring, summer and fall. We generally measure progress toward completion on long-term paving and related services contracts based on the proportion of costs incurred to date relative to total estimated costs at completion. Estimating costs to be incurred for revenue recognition involves the use of various estimating techniques to project costs at completion, and in some cases includes estimates of recoveries asserted against the customer for changes in specifications or other disputes.
Leases	We lease construction and office equipment, distribution facilities and office space. Leases with an initial term of 12 months or less, including month to month leases, are not recorded on the balance sheet. Lease expense for short-term leases is recognized on a straight line basis over the lease term. For lease agreements we have entered into or reassessed, we combine lease and nonlease components. While we also own mineral leases for mining operations, those leases are outside the scope of Accounting Standards Update No. 2016-2, Leases (Topic 842). Assets acquired under finance leases are included in property, plant and equipment.

ACQUISITIONS, DISPOSTIONS, GO_2

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES (Tables)	9 Months Ended
	Sep. 30, 2023
Business Acquisition [Line Items]
Schedule Of Acquisitions By Region	The following table summarizes the Company’s acquisitions by region and period: Nine months ended Year ended September 30, 2023 December 31, 2022 West 3 — East 1 2
Schedule of Assets Acquired and Liabilities Assumed	The following table summarizes aggregated information regarding the fair values of the assets acquired and liabilities assumed as of the respective acquisition dates: Nine months ended Year ended September 30, 2023 December 31, 2022 Financial assets $ 12,747 $ 297 Inventories 6,694 161 Property, plant and equipment 124,051 30,041 Other assets 1,550 1,116 Financial liabilities (11,973) (1,120) Other long-term liabilities (768) (1,589) Net assets acquired 132,301 28,906 Goodwill 108,803 — Purchase price 241,104 28,906 Acquisition-related liabilities — (6,176) Other (1,596) — Net cash paid for acquisitions $ 239,508 $ 22,730
Schedule of Goodwill by Reportable Segment and in Total	Changes in the carrying amount of goodwill, by reportable segment, from December 31, 2022 to September 30, 2023 are summarized as follows: West East Cement Total Balance—December 31, 2022 $ 566,389 $ 361,501 $ 204,656 $ 1,132,546 Acquisitions (1) 108,803 — — 108,803 Foreign currency translation adjustments 123 — — 123 Balance—September 30, 2023 $ 675,315 $ 361,501 $ 204,656 $ 1,241,472 _______________________________________________________________________ (1) Reflects goodwill from 2023 acquisitions.
Schedule of Intangible Assets by Type and in Total	The following table shows intangible assets by type and in total: September 30, 2023 December 31, 2022 Gross Accumulated Net Gross Accumulated Net Operating permits $ 38,677 $ (5,291) $ 33,386 $ 38,677 $ (4,109) $ 34,568 Mineral leases 17,778 (7,452) 10,326 18,091 (7,056) 11,035 Reserve rights 25,586 (4,814) 20,772 25,242 (3,872) 21,370 Other 4,888 (558) 4,330 4,877 (466) 4,411 Total intangible assets $ 86,929 $ (18,115) $ 68,814 $ 86,887 $ (15,503) $ 71,384
Schedule of Estimated Amortization Expense for Intangible Assets	The estimated amortization expense for the intangible assets for each of the five years subsequent to September 30, 2023 is as follows: 2023 (three months) $ 1,001 2024 4,011 2025 3,969 2026 3,920 2027 3,908 2028 3,910 Thereafter 48,095 Total $ 68,814
Summit Materials, LLC
Business Acquisition [Line Items]
Schedule Of Acquisitions By Region	The following table summarizes the Company’s acquisitions by region and period: Nine months ended Year ended September 30, 2023 December 31, 2022 West 3 — East 1 2
Schedule of Assets Acquired and Liabilities Assumed	The following table summarizes aggregated information regarding the fair values of the assets acquired and liabilities assumed as of the respective acquisition dates: Nine months ended Year ended September 30, 2023 December 31, 2022 Financial assets $ 12,747 $ 297 Inventories 6,694 161 Property, plant and equipment 124,051 30,041 Other assets 1,550 1,116 Financial liabilities (11,973) (1,120) Other long-term liabilities (768) (1,589) Net assets acquired 132,301 28,906 Goodwill 108,803 — Purchase price 241,104 28,906 Acquisition-related liabilities — (6,176) Other (1,596) — Net cash paid for acquisitions $ 239,508 $ 22,730
Schedule of Goodwill by Reportable Segment and in Total	Changes in the carrying amount of goodwill, by reportable segment, from December 31, 2022 to September 30, 2023 are summarized as follows: West East Cement Total Balance—December 31, 2022 $ 567,389 $ 361,501 $ 204,656 $ 1,133,546 Acquisitions (1) 108,803 — — 108,803 Foreign currency translation adjustments 123 — — 123 Balance—September 30, 2023 $ 676,315 $ 361,501 $ 204,656 $ 1,242,472 _______________________________________________________________________ (1) Reflects goodwill from 2023 acquisitions.
Schedule of Intangible Assets by Type and in Total	The following table shows intangible assets by type and in total: September 30, 2023 December 31, 2022 Gross Accumulated Net Gross Accumulated Net Operating permits $ 38,677 $ (5,291) $ 33,386 $ 38,677 $ (4,109) $ 34,568 Mineral leases 17,778 (7,452) 10,326 18,091 (7,056) 11,035 Reserve rights 25,586 (4,814) 20,772 25,242 (3,872) 21,370 Other 4,888 (558) 4,330 4,877 (466) 4,411 Total intangible assets $ 86,929 $ (18,115) $ 68,814 $ 86,887 $ (15,503) $ 71,384
Schedule of Estimated Amortization Expense for Intangible Assets	The estimated amortization expense for the intangible assets for each of the five years subsequent to September 30, 2023 is as follows: 2023 (three months) $ 1,001 2024 4,011 2025 3,969 2026 3,920 2027 3,908 2028 3,910 Thereafter 48,095 Total $ 68,814

REVENUE RECOGNITION (Tables)

REVENUE RECOGNITION (Tables)	9 Months Ended
	Sep. 30, 2023
Revenue from External Customer [Line Items]
Schedule of Revenue by Product	Revenue by product for the three and nine months ended September 30, 2023 and October 1, 2022 is as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Revenue by product*: Aggregates $ 179,819 $ 163,524 $ 505,984 $ 448,397 Cement 115,135 112,489 267,755 241,858 Ready-mix concrete 213,325 189,081 551,673 530,001 Asphalt 117,896 106,804 236,340 218,083 Paving and related services 110,370 120,327 226,928 249,547 Other 58,252 60,522 170,655 172,362 Total revenue $ 794,797 $ 752,747 $ 1,959,335 $ 1,860,248 *Revenue from liquid asphalt terminals is included in asphalt revenue.
Schedule of Accounts Receivable, Net	Accounts receivable, net consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Trade accounts receivable $ 305,436 $ 215,766 Construction contract receivables 64,438 37,067 Retention receivables 13,165 11,048 Accounts receivable 383,039 263,881 Less: Allowance for doubtful accounts (7,110) (7,212) Accounts receivable, net $ 375,929 $ 256,669
Summit Materials, LLC
Revenue from External Customer [Line Items]
Schedule of Revenue by Product	Revenue by product for the three and nine months ended September 30, 2023 and October 1, 2022 is as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Revenue by product*: Aggregates $ 179,819 $ 163,524 $ 505,984 $ 448,397 Cement 115,135 112,489 267,755 241,858 Ready-mix concrete 213,325 189,081 551,673 530,001 Asphalt 117,896 106,804 236,340 218,083 Paving and related services 110,370 120,327 226,928 249,547 Other 58,252 60,522 170,655 172,362 Total revenue $ 794,797 $ 752,747 $ 1,959,335 $ 1,860,248 *Revenue from liquid asphalt terminals is included in asphalt revenue.
Schedule of Accounts Receivable, Net	Accounts receivable, net consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Trade accounts receivable $ 305,436 $ 215,766 Construction contract receivables 64,438 37,067 Retention receivables 13,165 11,048 Accounts receivable 383,039 263,881 Less: Allowance for doubtful accounts (7,110) (7,212) Accounts receivable, net $ 375,929 $ 256,669

INVENTORIES (Tables)

INVENTORIES (Tables)	9 Months Ended
	Sep. 30, 2023
Inventory [Line Items]
Schedule of Components of Inventories	Inventories consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Aggregate stockpiles $ 165,071 $ 148,347 Finished goods 43,316 33,622 Work in process 11,220 8,191 Raw materials 23,529 22,331 Total $ 243,136 $ 212,491
Summit Materials, LLC
Inventory [Line Items]
Schedule of Components of Inventories	Inventories consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Aggregate stockpiles $ 165,071 $ 148,347 Finished goods 43,316 33,622 Work in process 11,220 8,191 Raw materials 23,529 22,331 Total $ 243,136 $ 212,491

ACCRUED EXPENSES (Tables)

ACCRUED EXPENSES (Tables)	9 Months Ended
	Sep. 30, 2023
Schedule Of Accrued Expenses [Line Items]
Schedule of Components of Accrued Expenses	Accrued expenses consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Interest $ 10,677 $ 24,625 Payroll and benefits 48,595 34,485 Finance lease obligations 3,399 6,959 Insurance 23,874 18,127 Current portion of TRA liability and non-income taxes 14,349 4,360 Deferred asset purchase payments 5,892 5,131 Professional fees 11,980 924 Other (1) 28,853 25,356 Total $ 147,619 $ 119,967 (1) Consists primarily of current portion of asset retirement obligations and miscellaneous accruals.
Summit Materials, LLC
Schedule Of Accrued Expenses [Line Items]
Schedule of Components of Accrued Expenses	Accrued expenses consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Interest $ 10,677 $ 24,625 Payroll and benefits 48,595 34,485 Finance lease obligations 3,399 6,959 Insurance 23,874 18,127 Non-income taxes 14,835 5,101 Deferred asset purchase payments 5,892 5,131 Professional fees 11,980 924 Other (1) 28,853 25,356 Total $ 148,105 $ 120,708 _______________________________________________________________________ (1) Consists primarily of current portion of asset retirement obligations and miscellaneous accruals.

DEBT (Tables)

DEBT (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Instrument [Line Items]
Schedule of Debt	Debt consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Term Loan, due 2027: $505.7 million and $509.6 million, net of $4.2 million and $5.0 million discount at September 30, 2023 and December 31, 2022, respectively $ 501,492 $ 504,549 6 1 ⁄ 2 % Senior Notes, due 2027 300,000 300,000 5 1 ⁄ 4 % Senior Notes, due 2029 700,000 700,000 Total 1,501,492 1,504,549 Current portion of long-term debt 3,822 5,096 Long-term debt $ 1,497,670 $ 1,499,453
Schedule of Contractual Payments of Long-Term Debt	The contractual payments of long-term debt, including current maturities, for the five years subsequent to September 30, 2023, are as follows: 2023 (three months) $ 1,274 2024 3,822 2025 6,369 2026 5,096 2027 789,177 2028 — Thereafter 700,000 Total 1,505,738 Less: Original issue net discount (4,246) Less: Capitalized loan costs (9,601) Total debt $ 1,491,891
Shedule of Activity for Deferred Financing Fees	The following table presents the activity for the deferred financing fees for the nine months ended September 30, 2023 and October 1, 2022: Deferred financing fees Balance—December 31, 2022 $ 11,489 Loan origination fees 1,566 Amortization (1,838) Write off of deferred financing fees (160) Balance—September 30, 2023 $ 11,057 Balance—January 1, 2022 $ 13,049 Amortization (2,028) Balance—October 1, 2022 $ 11,021
Summit Materials, LLC
Debt Instrument [Line Items]
Schedule of Debt	Debt consisted of the following as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Term Loan, due 2027: $505.7 million and $509.6 million, net of $4.2 million and $5.0 million discount at September 30, 2023 and December 31, 2022, respectively $ 501,492 $ 504,549 6 1/2 % Senior Notes, due 2027 300,000 300,000 5 1/4 % Senior Notes, due 2029 700,000 700,000 Total 1,501,492 1,504,549 Current portion of long-term debt 3,822 5,096 Long-term debt $ 1,497,670 $ 1,499,453
Schedule of Contractual Payments of Long-Term Debt	The contractual payments of long-term debt, including current maturities, for the five years subsequent to September 30, 2023, are as follows: 2023 (three months) $ 1,274 2024 3,822 2025 6,369 2026 5,096 2027 789,177 2028 — Thereafter 700,000 Total 1,505,738 Less: Original issue net discount (4,246) Less: Capitalized loan costs (9,601) Total debt $ 1,491,891
Shedule of Activity for Deferred Financing Fees	The following table presents the activity for the deferred financing fees for the nine months ended September 30, 2023 and October 1, 2022: Deferred financing fees Balance—December 31, 2022 $ 11,489 Loan origination fees 1,566 Amortization (1,838) Write off of deferred financing fees (160) Balance—September 30, 2023 $ 11,057 Balance - January 1, 2022 $ 13,049 Amortization (2,028) Balance -October 1, 2022 $ 11,021

INCOME TAXES (Tables)

INCOME TAXES (Tables)	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Schedule Of Changes In Tax Receivable Agreement Liability	Changes in the balance of the TRA liability, from December 31, 2022 to September 30, 2023 are summarized as follows: TRA Liability Balance — December 31, 2022 $ 328,356 LP unit exchanges during period 1,146 Purchase of TRA interests (122,935) TRA liability reduction (153,080) TRA liability payments (544) Total 52,943 Less current portion 800 Balance — September 30, 2023 $ 52,143

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Schedule of Basic Earnings Per Share	The following table shows the calculation of basic and diluted earnings per share: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Net income attributable to Summit Inc. $ 230,045 $ 86,489 $ 282,878 $ 242,310 Weighted average shares of Class A stock outstanding 118,928,799 119,753,806 118,780,523 120,196,211 Add: Nonvested restricted stock awards of retirement eligible shares 84,532 142,466 94,444 148,804 Weighted average shares outstanding 119,013,331 119,896,272 118,874,967 120,345,015 Basic earnings per share $ 1.93 $ 0.72 $ 2.38 $ 2.01 Diluted net income attributable to Summit Inc. $ 230,045 $ 86,489 $ 282,878 $ 242,310 Weighted average shares outstanding 119,013,331 119,896,272 118,874,967 120,345,015 Add: stock options 122,753 78,799 108,024 93,993 Add: warrants 15,578 10,790 13,943 12,202 Add: restricted stock units 356,286 279,684 376,221 485,174 Add: performance stock units 217,745 117,767 185,819 141,766 Weighted average dilutive shares outstanding 119,725,693 120,383,312 119,558,974 121,078,150 Diluted earnings per share $ 1.92 $ 0.72 $ 2.37 $ 2.00
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	Excluded from the above calculations were the shares noted below as they were antidilutive: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Antidilutive shares: LP Units 1,303,990 1,312,795 1,308,417 1,313,601

STOCKHOLDERS' EQUITY_MEMBERS'_2

STOCKHOLDERS' EQUITY/MEMBERS' INTEREST (Tables)	9 Months Ended
	Sep. 30, 2023
Schedule of Capitalization, Equity [Line Items]
Schedule of Changes in Ownership of Summit Holdings	The following table summarizes the changes in our ownership of Summit Holdings: Summit Inc. LP Units Total Summit Inc. Balance — December 31, 2022 118,408,655 1,312,004 119,720,659 98.9 % Exchanges during period 176,258 (176,258) — Stock option exercises 5,407 — 5,407 Other equity transactions 522,630 — 522,630 Balance — September 30, 2023 119,112,950 1,135,746 120,248,696 99.1 % Balance — January 1, 2022 120,684,322 1,314,006 121,998,328 98.9 % Exchanges during period 2,000 (2,000) — Stock option exercises 10,098 — 10,098 Repurchases of common stock (3,427,510) — (3,427,510) Other equity transactions 1,097,273 — 1,097,273 Balance — October 1, 2022 118,366,183 1,312,006 119,678,189 98.9 %
Schedule of Changes in Each Component of Accumulated Other Comprehensive Income (Loss)	The changes in each component of accumulated other comprehensive income (loss) consisted of the following: Change in Foreign currency Accumulated Balance — December 31, 2022 $ 6,356 $ (3,272) $ 3,084 Foreign currency translation adjustment, net of tax — 212 212 Balance — September 30, 2023 $ 6,356 $ (3,060) $ 3,296 Balance — January 1, 2022 $ 1,508 $ 5,575 $ 7,083 Foreign currency translation adjustment, net of tax — (10,553) (10,553) Balance — October 1, 2022 $ 1,508 $ (4,978) $ (3,470)
Summit Materials, LLC
Schedule of Capitalization, Equity [Line Items]
Schedule of Changes in Each Component of 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 comprehensive retirement plans adjustments (loss) income Balance — December 31, 2022 $ (762) $ (20,614) $ (21,376) Foreign currency translation adjustment — 295 295 Balance — September 30, 2023 $ (762) $ (20,319) $ (21,081) Balance — January 1, 2022 $ (7,243) $ (8,783) $ (16,026) Foreign currency translation adjustment — (14,113) (14,113) Balance — October 1, 2022 $ (7,243) $ (22,896) $ (30,139)

SUPPLEMENTAL CASH FLOW INFORM_2

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)	9 Months Ended
	Sep. 30, 2023
Schedule Of Cash Flow Supplemental [Line Items]
Schedule of Supplemental Cash Flow Information	Supplemental cash flow information is as follows: Nine months ended September 30, 2023 October 1, 2022 Cash payments: Interest $ 88,400 $ 70,184 Payments for income taxes, net 13,602 15,888 Operating cash payments on operating leases 7,578 7,112 Operating cash payments on finance leases 400 890 Finance cash payments on finance leases 6,137 13,465 Non cash investing and financing activities: Accrued liabilities for purchases of property, plant and equipment $ 22,244 $ 16,778 Right of use assets obtained in exchange for operating lease obligations 6,371 13,302 Right of use assets obtained in exchange for finance leases obligations 413 258 Exchange of LP Units to shares of Class A common stock 5,527 62
Summit Materials, LLC
Schedule Of Cash Flow Supplemental [Line Items]
Schedule of Supplemental Cash Flow Information	Supplemental cash flow information is as follows: Nine months ended September 30, 2023 October 1, 2022 Cash payments: Interest $ 88,400 $ 70,184 Payments for income taxes, net 13,602 15,888 Operating cash payments on operating leases 7,578 7,112 Operating cash payments on finance leases 400 890 Finance cash payments on finance leases 6,137 13,465 Non cash investing and financing activities: Accrued liabilities for purchases of property, plant and equipment $ 22,244 $ 16,778 Right of use assets obtained in exchange for operating lease obligations 6,371 13,302 Right of use assets obtained in exchange for finance leases obligations 413 258

LEASES (Tables)

LEASES (Tables)	9 Months Ended
	Sep. 30, 2023
Lessee, Lease, Description [Line Items]
Schedule of Lease Cost	The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579
Schedule of Lease Assets and Liabilities	The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579
Schedule of Finance Lease Liability Maturities	The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579
Schedule of Operating Lease Liability Maturities	The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579
Summit Materials, LLC
Lessee, Lease, Description [Line Items]
Schedule of Lease Cost	The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579
Schedule of Lease Assets and Liabilities	The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579
Schedule of Finance Lease Liability Maturities	The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579
Schedule of Operating Lease Liability Maturities	The components of lease expense were as follows: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Operating lease cost $ 2,903 $ 2,398 $ 8,241 $ 7,181 Variable lease cost 39 70 103 225 Short-term lease cost 13,238 11,916 30,692 31,097 Financing lease cost: Amortization of right-of-use assets 483 1,235 2,015 4,598 Interest on lease liabilities 118 239 399 879 Total lease cost $ 16,781 $ 15,858 $ 41,450 $ 43,980 September 30, 2023 December 31, 2022 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 38,380 $ 37,889 Current operating lease liabilities $ 8,745 $ 7,296 Noncurrent operating lease liabilities 34,838 35,737 Total operating lease liabilities $ 43,583 $ 43,033 Finance leases: Property and equipment, gross $ 20,030 $ 32,119 Less accumulated depreciation (9,893) (14,992) Property and equipment, net $ 10,137 $ 17,127 Current finance lease liabilities $ 3,399 $ 6,959 Long-term finance lease liabilities 5,180 7,167 Total finance lease liabilities $ 8,579 $ 14,126 Weighted average remaining lease term (years): Operating leases 8.4 9.1 Finance lease 3.4 2.8 Weighted average discount rate: Operating leases 5.1 % 4.7 % Finance leases 5.9 % 5.3 % Maturities of lease liabilities, as of September 30, 2023, were as follows: Operating Leases Finance Leases 2023 (three months) $ 2,739 $ 1,283 2024 10,294 3,052 2025 8,165 2,435 2026 6,414 990 2027 4,760 760 2028 3,450 513 Thereafter 17,600 570 Total lease payments 53,422 9,603 Less imputed interest (9,839) (1,024) Present value of lease payments $ 43,583 $ 8,579

FAIR VALUE (Tables)

FAIR VALUE (Tables)	9 Months Ended
	Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Contingent Consideration and Derivatives Measured at Fair Value	The fair value of contingent consideration as of September 30, 2023 and December 31, 2022 was: September 30, 2023 December 31, 2022 Current portion of acquisition-related liabilities and Accrued expenses: Contingent consideration $ 139 $ 336 Acquisition-related liabilities and Other noncurrent liabilities: Contingent consideration $ 9,296 $ 4,981
Schedule of Carrying Value and Fair Value of Financial Instruments	The carrying value and fair value of these financial instruments as of September 30, 2023 and December 31, 2022 was: September 30, 2023 December 31, 2022 Fair Value Carrying Value Fair Value Carrying Value Level 1 Long-term debt(1) $ 1,434,238 $ 1,501,492 $ 1,447,673 $ 1,504,549 Level 3 Current portion of deferred consideration and noncompete obligations(2) 6,889 6,889 13,382 13,382 Long term portion of deferred consideration and noncompete obligations(3) 18,337 18,337 24,070 24,070 (1) $3.8 million and $5.1 million was included in current portion of debt as of September 30, 2023 and December 31, 2022, respectively. (2) Included in current portion of acquisition-related liabilities on the consolidated balance sheets. (3) Included in acquisition-related liabilities on the consolidated balance sheets.
Summit Materials, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Contingent Consideration and Derivatives Measured at Fair Value	The fair value of contingent consideration as of September 30, 2023 and December 31, 2022 was: September 30, 2023 December 31, 2022 Current portion of acquisition-related liabilities and Accrued expenses: Contingent consideration $ 139 $ 336 Acquisition-related liabilities and Other noncurrent liabilities: Contingent consideration $ 9,296 $ 4,981
Schedule of Carrying Value and Fair Value of Financial Instruments	The carrying value and fair value of these financial instruments as of September 30, 2023 and December 31, 2022 was: September 30, 2023 December 31, 2022 Fair Value Carrying Value Fair Value Carrying Value Level 1 Long-term debt(1) $ 1,434,238 $ 1,501,492 $ 1,447,673 $ 1,504,549 Level 3 Current portion of deferred consideration and noncompete obligations(2) 6,889 6,889 13,382 13,382 Long term portion of deferred consideration and noncompete obligations(3) 18,337 18,337 24,070 24,070 (1) $3.8 million and $5.1 million was included in current portion of debt as of September 30, 2023 and December 31, 2022, respectively. (2) Included in current portion of acquisition-related liabilities on the consolidated balance sheets. (3) Included in acquisition-related liabilities on the consolidated balance sheets.

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	9 Months Ended
	Sep. 30, 2023
Segment Reporting Information [Line Items]
Schedule of Financial Data for Company's Reportable Business Segments	The following tables display selected financial data for the Company’s reportable business segments as of September 30, 2023 and December 31, 2022 and for the three and nine months ended September 30, 2023 and October 1, 2022: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Revenue*: West $ 496,638 $ 439,411 $ 1,178,258 $ 1,075,393 East 176,840 193,421 493,766 525,064 Cement 121,319 119,915 287,311 259,791 Total revenue $ 794,797 $ 752,747 $ 1,959,335 $ 1,860,248 *Intercompany sales are immaterial and the presentation above only reflects sales to external customers. Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Income from operations before taxes $ 256,633 $ 112,480 $ 326,164 $ 319,650 Interest expense 28,013 21,980 83,335 62,728 Depreciation, depletion and amortization 56,691 51,439 160,921 148,373 Accretion 761 694 2,212 2,110 Loss on debt financings — — 493 — Tax receivable agreement (benefit) expense (153,080) — (153,080) 954 Gain on sale of businesses — (4,115) — (174,373) Non-cash compensation 5,192 4,902 15,116 15,058 Argos USA acquisition and integration costs 17,859 — 17,859 — Other (3,550) (2,492) (11,555) (2,315) Total Adjusted EBITDA $ 208,519 $ 184,888 $ 441,465 $ 372,185 Total Adjusted EBITDA by Segment: West $ 117,846 $ 98,281 $ 255,041 $ 215,617 East 50,089 44,119 116,558 98,949 Cement 50,355 46,597 103,237 84,019 Corporate and other (9,771) (4,109) (33,371) (26,400) Total Adjusted EBITDA $ 208,519 $ 184,888 $ 441,465 $ 372,185 Nine months ended September 30, 2023 October 1, 2022 Purchases of property, plant and equipment West $ 98,025 $ 85,462 East 45,754 65,116 Cement 28,914 30,503 Total reportable segments 172,693 181,081 Corporate and other 9,489 7,927 Total purchases of property, plant and equipment $ 182,182 $ 189,008 Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Depreciation, depletion, amortization and accretion: West $ 28,701 $ 24,908 $ 83,218 $ 71,495 East 15,586 15,445 46,839 48,655 Cement 12,143 10,959 30,032 27,993 Total reportable segments 56,430 51,312 160,089 148,143 Corporate and other 1,022 821 3,044 2,340 Total depreciation, depletion, amortization and accretion $ 57,452 $ 52,133 $ 163,133 $ 150,483 September 30, 2023 December 31, 2022 Total assets: West $ 1,932,418 $ 1,565,776 East 1,191,237 1,151,223 Cement 914,416 873,604 Total reportable segments 4,038,071 3,590,603 Corporate and other 326,893 665,089 Total $ 4,364,964 $ 4,255,692
Summit Materials, LLC
Segment Reporting Information [Line Items]
Schedule of Financial Data for Company's Reportable Business Segments	The following tables display selected financial data for the Company’s reportable business segments as of September 30, 2023 and December 31, 2022 and for the three and nine months ended September 30, 2023 and October 1, 2022: Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Revenue*: West $ 496,638 $ 439,411 $ 1,178,258 $ 1,075,393 East 176,840 193,421 493,766 525,064 Cement 121,319 119,915 287,311 259,791 Total revenue $ 794,797 $ 752,747 $ 1,959,335 $ 1,860,248 *Intercompany sales are immaterial and the presentation above only reflects sales to external customers. Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Income from operations before taxes $ 103,551 $ 112,480 $ 173,082 $ 320,604 Interest expense 28,013 21,980 83,335 62,728 Depreciation, depletion and amortization 56,691 51,439 160,921 148,373 Accretion 761 694 2,212 2,110 Loss on debt financings — — 493 — Gain on sale of businesses — (4,115) — (174,373) Non-cash compensation 5,192 4,902 15,116 15,058 Argos USA acquisition and integration costs 17,859 — 17,859 — Other (3,548) (2,492) (11,553) (2,315) Total Adjusted EBITDA $ 208,519 $ 184,888 $ 441,465 $ 372,185 Total Adjusted EBITDA by Segment: West $ 117,846 $ 98,281 $ 255,041 $ 215,617 East 50,089 44,119 116,558 98,949 Cement 50,355 46,597 103,237 84,019 Corporate and other (9,771) (4,109) (33,371) (26,400) Total Adjusted EBITDA $ 208,519 $ 184,888 $ 441,465 $ 372,185 Nine months ended September 30, 2023 October 1, 2022 Purchases of property, plant and equipment West $ 98,025 $ 85,462 East 45,754 65,116 Cement 28,914 30,503 Total reportable segments 172,693 181,081 Corporate and other 9,489 7,927 Total purchases of property, plant and equipment $ 182,182 $ 189,008 Three months ended Nine months ended September 30, 2023 October 1, 2022 September 30, 2023 October 1, 2022 Depreciation, depletion, amortization and accretion: West $ 28,701 $ 24,908 $ 83,218 $ 71,495 East 15,586 15,445 46,839 48,655 Cement 12,143 10,959 30,032 27,993 Total reportable segments 56,430 51,312 160,089 148,143 Corporate and other 1,022 821 3,044 2,340 Total depreciation, depletion, amortization and accretion $ 57,452 $ 52,133 $ 163,133 $ 150,483 September 30, 2023 December 31, 2022 Total assets: West $ 1,932,418 $ 1,565,776 East 1,191,237 1,151,223 Cement 914,416 873,604 Total reportable segments 4,038,071 3,590,603 Corporate and other 332,987 529,103 Total $ 4,371,058 $ 4,119,706

GUARANTOR AND NON-GUARANTOR F_2

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Tables) - Summit Materials, LLC	9 Months Ended
	Sep. 30, 2023
Schedule of Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheets September 30, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 169,370 $ 3,556 $ 33,135 $ (13,065) $ 192,996 Accounts receivable, net 2,232 341,351 32,478 (132) 375,929 Intercompany receivables 302,181 2,152,362 — (2,454,543) — Cost and estimated earnings in excess of billings — 39,746 1,239 — 40,985 Inventories — 236,913 6,223 — 243,136 Other current assets 12,896 9,848 1,334 — 24,078 Total current assets 486,679 2,783,776 74,409 (2,467,740) 877,124 Property, plant and equipment, net 31,982 1,865,176 77,374 — 1,974,532 Goodwill — 1,185,739 56,733 — 1,242,472 Intangible assets, net — 64,486 4,328 — 68,814 Operating lease right-of-use assets 3,987 30,048 4,345 — 38,380 Other assets 5,301,038 220,772 774 (5,352,848) 169,736 Total assets $ 5,823,686 $ 6,149,997 $ 217,963 $ (7,820,588) $ 4,371,058 Liabilities and Members' Interest Current liabilities: Current portion of debt $ 3,822 $ — $ — $ — $ 3,822 Current portion of acquisition-related liabilities — 7,028 — — 7,028 Accounts payable 6,524 155,276 11,314 (132) 172,982 Accrued expenses 62,279 94,833 4,058 (13,065) 148,105 Current operating lease liabilities 910 7,276 559 — 8,745 Intercompany payables 1,942,556 509,873 2,114 (2,454,543) — Billings in excess of costs and estimated earnings — 7,480 1,059 — 8,539 Total current liabilities 2,016,091 781,766 19,104 (2,467,740) 349,221 Long-term debt 1,488,069 — — — 1,488,069 Acquisition-related liabilities — 27,633 — — 27,633 Noncurrent operating lease liabilities 8,135 23,041 3,662 — 34,838 Other noncurrent liabilities 5,289 207,728 116,599 (164,421) 165,195 Total liabilities 3,517,584 1,040,168 139,365 (2,632,161) 2,064,956 Total members' interest 2,306,102 5,109,829 78,598 (5,188,427) 2,306,102 Total liabilities and members' interest $ 5,823,686 $ 6,149,997 $ 217,963 $ (7,820,588) $ 4,371,058 Condensed Consolidating Balance Sheets December 31, 2022 Non- Issuers Guarantors Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 498,307 $ 2,864 $ 26,298 $ (7,018) $ 520,451 Accounts receivable, net 1,528 233,039 22,127 (25) 256,669 Intercompany receivables 329,744 1,937,390 — (2,267,134) — Cost and estimated earnings in excess of billings — 5,861 649 — 6,510 Inventories — 206,418 6,073 — 212,491 Other current assets 4,755 16,341 1,159 — 22,255 Total current assets 834,334 2,401,913 56,306 (2,274,177) 1,018,376 Property, plant and equipment, net 21,306 1,710,972 81,424 — 1,813,702 Goodwill — 1,076,935 56,611 — 1,133,546 Intangible assets, net — 66,972 4,412 — 71,384 Operating lease right-of-use assets 4,665 28,310 4,914 — 37,889 Other assets 4,599,488 204,644 1,220 (4,760,543) 44,809 Total assets $ 5,459,793 $ 5,489,746 $ 204,887 $ (7,034,720) $ 4,119,706 Liabilities and Members' Interest Current liabilities: Current portion of debt $ 5,096 $ — $ — $ — $ 5,096 Current portion of acquisition-related liabilities — 13,718 — — 13,718 Accounts payable 3,553 93,096 7,806 (25) 104,430 Accrued expenses 54,417 70,433 2,876 (7,018) 120,708 Current operating lease liabilities 921 5,637 738 — 7,296 Intercompany payables 1,750,352 513,494 3,288 (2,267,134) — Billings in excess of costs and estimated earnings — 4,956 783 — 5,739 Total current liabilities 1,814,339 701,334 15,491 (2,274,177) 256,987 Long-term debt 1,488,569 — — — 1,488,569 Acquisition-related liabilities — 29,051 — — 29,051 Noncurrent operating lease liabilities 8,726 22,871 4,140 — 35,737 Other noncurrent liabilities 5,009 208,185 117,439 (164,421) 166,212 Total liabilities 3,316,643 961,441 137,070 (2,438,598) 1,976,556 Total members' interest 2,143,150 4,528,305 67,817 (4,596,122) 2,143,150 Total liabilities and members' interest $ 5,459,793 $ 5,489,746 $ 204,887 $ (7,034,720) $ 4,119,706
Schedule of Pro Forma Condensed Combined Statement of Operations	Condensed Consolidating Statements of Operations For the three months ended September 30, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 759,491 $ 36,792 $ (1,486) $ 794,797 Cost of revenue (excluding items shown separately below) — 519,059 25,586 (1,486) 543,159 General and administrative expenses 33,073 31,548 1,582 — 66,203 Depreciation, depletion, amortization and accretion 1,022 53,779 2,651 — 57,452 Operating (loss) income (34,095) 155,105 6,973 — 127,983 Other income, net (171,236) (106) (553) 168,314 (3,581) Interest expense (income) 41,642 (15,002) 1,373 — 28,013 Income from operation before taxes 95,499 170,213 6,153 (168,314) 103,551 Income tax expense 399 6,407 1,645 — 8,451 Net income attributable to Summit LLC $ 95,100 $ 163,806 $ 4,508 $ (168,314) $ 95,100 Comprehensive income attributable to member of Summit Materials, LLC $ 91,290 $ 163,806 $ 8,318 $ (172,124) $ 91,290 Condensed Consolidating Statements of Operations For the nine months ended September 30, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 1,863,825 $ 99,354 $ (3,844) $ 1,959,335 Cost of revenue (excluding items shown separately below) — 1,324,138 69,305 (3,844) 1,389,599 General and administrative expenses 66,947 92,502 5,013 — 164,462 Depreciation, depletion, amortization and accretion 3,044 151,850 8,239 — 163,133 Operating (loss) income (69,991) 295,335 16,797 — 242,141 Other income, net (351,086) (1,653) (1,662) 340,125 (14,276) Interest expense (income) 121,917 (42,695) 4,113 — 83,335 Income from operation before taxes 159,178 339,683 14,346 (340,125) 173,082 Income tax expense 1,199 10,043 3,861 — 15,103 Net income attributable to Summit LLC $ 157,979 $ 329,640 $ 10,485 $ (340,125) $ 157,979 Comprehensive income attributable to member of Summit Materials, LLC $ 158,274 $ 329,640 $ 10,190 $ (339,830) $ 158,274 Condensed Consolidating Statements of Operations For the three months ended October 1, 2022 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 718,510 $ 37,112 $ (2,875) $ 752,747 Cost of revenue (excluding items shown separately below) — 511,848 25,963 (2,875) 534,936 General and administrative expenses 9,138 27,717 1,761 — 38,616 Depreciation, depletion, amortization and accretion 822 48,442 2,869 — 52,133 Operating (loss) income (9,960) 130,503 6,519 — 127,062 Other income, net (147,353) (399) (106) 144,575 (3,283) Interest expense (income) 35,536 (14,926) 1,370 — 21,980 (Gain) loss on sale of business (5,120) 1,005 — — (4,115) Income from operation before taxes 106,977 144,823 5,255 (144,575) 112,480 Income tax expense 1,644 4,119 1,384 — 7,147 Net income attributable to Summit LLC $ 105,333 $ 140,704 $ 3,871 $ (144,575) $ 105,333 Comprehensive income attributable to member of Summit Materials, LLC $ 95,086 $ 140,704 $ 14,118 $ (154,822) $ 95,086 Condensed Consolidating Statements of Operations For the nine months ended October 1, 2022 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 1,770,642 $ 97,972 $ (8,366) $ 1,860,248 Cost of revenue (excluding items shown separately below) — 1,310,495 70,392 (8,366) 1,372,521 General and administrative expenses 42,360 85,816 5,065 — 133,241 Depreciation, depletion, amortization and accretion 2,341 139,280 8,862 — 150,483 Operating (loss) income (44,701) 235,051 13,653 — 204,003 Other income, net (320,069) (1,384) (17) 316,514 (4,956) Interest expense (income) 103,017 (44,399) 4,110 — 62,728 Gain on sale of business (131,721) (42,652) — — (174,373) Income from operation before taxes 304,072 323,486 9,560 (316,514) 320,604 Income tax expense 3,025 13,985 2,547 — 19,557 Net income attributable to Summit LLC $ 301,047 $ 309,501 $ 7,013 $ (316,514) $ 301,047 Comprehensive income attributable to member of Summit Materials, LLC $ 286,934 $ 309,501 $ 21,126 $ (330,627) $ 286,934
Schedule of Condensed Consolidating Statements of Cash Flows	Condensed Consolidating Statements of Cash Flows For the nine months ended September 30, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Net cash (used in) provided by operating activities $ (124,375) $ 352,592 $ 15,406 $ — $ 243,623 Cash flow from investing activities: Acquisitions, net of cash acquired — (239,508) — — (239,508) Purchase of property, plant and equipment (9,490) (168,843) (3,849) — (182,182) Proceeds from the sale of property, plant, and equipment — 9,265 495 — 9,760 Other — (3,602) — — (3,602) Net cash used in investing activities (9,490) (402,688) (3,354) — (415,532) Cash flow from financing activities: Capital distributions to member (240,992) 241,104 — — 112 Loans received from and payments made on loans from other Summit Companies 181,538 (170,376) (5,115) (6,047) — Payments on long-term debt (3,822) (4,698) — — (8,520) Cash paid for tax receivable agreement interests (122,935) — — — (122,935) Payments on acquisition-related liabilities — (12,203) — — (12,203) Debt issuance costs (1,566) — — — (1,566) Distributions from partnership (4,538) — — — (4,538) Other (2,757) (3,039) (215) — (6,011) Net cash (used in) provided by financing activities (195,072) 50,788 (5,330) (6,047) (155,661) Impact of cash on foreign currency — — 115 — 115 Net (decrease) increase in cash (328,937) 692 6,837 (6,047) (327,455) Cash — Beginning of period 498,307 2,864 26,298 (7,018) 520,451 Cash — End of period $ 169,370 $ 3,556 $ 33,135 $ (13,065) $ 192,996 Condensed Consolidating Statements of Cash Flows For the nine months ended October 1, 2022 Non- Issuers Guarantors Guarantors Eliminations Consolidated Net cash (used in) provided by operating activities $ (109,265) $ 225,563 $ 15,282 $ — $ 131,580 Cash flow from investing activities: Acquisitions, net of cash acquired — (1,933) — — (1,933) Purchase of property, plant and equipment (7,927) (177,028) (4,053) — (189,008) Proceeds from the sale of property, plant, and equipment — 8,033 265 — 8,298 Proceeds from the sale of a business 5,924 367,866 — — 373,790 Other — (2,214) — — (2,214) Net cash (used in) provided by investing activities (2,003) 194,724 (3,788) — 188,933 Cash flow from financing activities: Capital distributions to member (102,713) 1,932 — — (100,781) Loans received from and payments made on loans from other Summit Companies 402,030 (396,330) (5,448) (252) — Payments on long-term debt (100,400) (13,369) — — (113,769) Payments on acquisition-related liabilities — (12,964) — — (12,964) Distributions from partnership (34,155) — — — (34,155) Other (754) (20) — — (774) Net cash provided by (used in) financing activities 164,008 (420,751) (5,448) (252) (262,443) Impact of cash on foreign currency — — (1,732) — (1,732) Net increase (decrease) in cash 52,740 (464) 4,314 (252) 56,338 Cash — Beginning of period 365,044 2,264 18,337 (4,684) 380,961 Cash — End of period $ 417,784 $ 1,800 $ 22,651 $ (4,936) $ 437,299

SUMMARY OF ORGANIZATION AND S_3

SUMMARY OF ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) state	Oct. 01, 2022 USD ($)	Sep. 30, 2023 USD ($) segment state cementPlant	Oct. 01, 2022 USD ($)
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Number of operating segments | segment			3
Number of reportable segments | segment			3
Number of states in which the entity operates | state	21		21
Transaction costs | $	$ 17,442	$ 727	$ 19,518	$ 2,637
Revision of Prior Period, Reclassification, Adjustment
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Transaction costs | $		700		2,600
Cement plant
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Number of plants | cementPlant			2
Summit Materials, LLC
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Number of operating segments | segment			3
Number of reportable segments | segment			3
Number of states in which the entity operates | state	21		21
Transaction costs | $	$ 17,442	727	$ 19,518	2,637
Summit Materials, LLC | Revision of Prior Period, Reclassification, Adjustment
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Transaction costs | $		$ 700		$ 2,600
Summit Materials, LLC | Cement plant
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Number of plants | cementPlant			2

ACQUISITIONS, DISPOSTIONS, GO_3

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Acquisitions by Region (Details) - acquisition	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
West
Business Acquisition [Line Items]
Number of businesses acquired	3	0
West | Summit Materials, LLC
Business Acquisition [Line Items]
Number of businesses acquired	3	0
East
Business Acquisition [Line Items]
Number of businesses acquired	1	2
East | Summit Materials, LLC
Business Acquisition [Line Items]
Number of businesses acquired	1	2

ACQUISITIONS, DISPOSTIONS, GO_4

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Goodwill	$ 1,241,472	$ 1,132,546
Summit Materials, LLC
Business Acquisition [Line Items]
Goodwill	1,242,472	1,133,546
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Financial assets	12,747	297
Inventories	6,694	161
Property, plant and equipment	124,051	30,041
Other assets	1,550	1,116
Financial liabilities	(11,973)	(1,120)
Other long-term liabilities	(768)	(1,589)
Net assets acquired	132,301	28,906
Goodwill	108,803	0
Purchase price	241,104	28,906
Acquisition-related liabilities	0	(6,176)
Other	(1,596)	0
Net cash paid for acquisitions	239,508	22,730
Series of Individually Immaterial Business Acquisitions | Summit Materials, LLC
Business Acquisition [Line Items]
Financial assets	12,747	297
Inventories	6,694	161
Property, plant and equipment	124,051	30,041
Other assets	1,550	1,116
Financial liabilities	(11,973)	(1,120)
Other long-term liabilities	(768)	(1,589)
Net assets acquired	132,301	28,906
Goodwill	108,803	0
Purchase price	241,104	28,906
Acquisition-related liabilities	0	(6,176)
Other	(1,596)	0
Net cash paid for acquisitions	$ 239,508	$ 22,730

ACQUISITIONS, DISPOSTIONS, GO_5

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Summary of Goodwill by Reportable Segments (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Balance—December 31, 2022	$ 1,132,546
Acquisitions	108,803
Foreign currency translation adjustments	123
Balance—September 30, 2023	1,241,472
West
Goodwill [Roll Forward]
Balance—December 31, 2022	566,389
Acquisitions	108,803
Foreign currency translation adjustments	123
Balance—September 30, 2023	675,315
East
Goodwill [Roll Forward]
Balance—December 31, 2022	361,501
Acquisitions	0
Foreign currency translation adjustments	0
Balance—September 30, 2023	361,501
Cement
Goodwill [Roll Forward]
Balance—December 31, 2022	204,656
Acquisitions	0
Foreign currency translation adjustments	0
Balance—September 30, 2023	204,656
Summit Materials, LLC
Goodwill [Roll Forward]
Balance—December 31, 2022	1,133,546
Acquisitions	108,803
Foreign currency translation adjustments	123
Balance—September 30, 2023	1,242,472
Summit Materials, LLC | West
Goodwill [Roll Forward]
Balance—December 31, 2022	567,389
Acquisitions	108,803
Foreign currency translation adjustments	123
Balance—September 30, 2023	676,315
Summit Materials, LLC | East
Goodwill [Roll Forward]
Balance—December 31, 2022	361,501
Acquisitions	0
Foreign currency translation adjustments	0
Balance—September 30, 2023	361,501
Summit Materials, LLC | Cement
Goodwill [Roll Forward]
Balance—December 31, 2022	204,656
Acquisitions	0
Foreign currency translation adjustments	0
Balance—September 30, 2023	$ 204,656

ACQUISITIONS, DISPOSTIONS, GO_6

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Intangible Assets By Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (18,115)		$ (18,115)		$ (15,503)
Amortization expense	800	$ 800	2,600	$ 2,600
Intangible Assets Excluding Intangible Assets Held for Sale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	86,929		86,929		86,887
Accumulated Amortization	(18,115)		(18,115)		(15,503)
Net Carrying Amount	68,814		68,814		71,384
Operating permits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	38,677		38,677		38,677
Accumulated Amortization	(5,291)		(5,291)		(4,109)
Net Carrying Amount	33,386		33,386		34,568
Mineral leases
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,778		17,778		18,091
Accumulated Amortization	(7,452)		(7,452)		(7,056)
Net Carrying Amount	10,326		10,326		11,035
Reserve rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,586		25,586		25,242
Accumulated Amortization	(4,814)		(4,814)		(3,872)
Net Carrying Amount	20,772		20,772		21,370
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,888		4,888		4,877
Accumulated Amortization	(558)		(558)		(466)
Net Carrying Amount	4,330		4,330		4,411
Summit Materials, LLC
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	(18,115)		(18,115)		(15,503)
Amortization expense	800	$ 800	2,600	$ 2,600
Summit Materials, LLC | Intangible Assets Excluding Intangible Assets Held for Sale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	86,929		86,929		86,887
Accumulated Amortization	(18,115)		(18,115)		(15,503)
Net Carrying Amount	68,814		68,814		71,384
Summit Materials, LLC | Operating permits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	38,677		38,677		38,677
Accumulated Amortization	(5,291)		(5,291)		(4,109)
Net Carrying Amount	33,386		33,386		34,568
Summit Materials, LLC | Mineral leases
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,778		17,778		18,091
Accumulated Amortization	(7,452)		(7,452)		(7,056)
Net Carrying Amount	10,326		10,326		11,035
Summit Materials, LLC | Reserve rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,586		25,586		25,242
Accumulated Amortization	(4,814)		(4,814)		(3,872)
Net Carrying Amount	20,772		20,772		21,370
Summit Materials, LLC | Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,888		4,888		4,877
Accumulated Amortization	(558)		(558)		(466)
Net Carrying Amount	$ 4,330		$ 4,330		$ 4,411

ACQUISITIONS, DISPOSTIONS, GO_7

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Estimated amortization expense
2023 (three months)	$ 1,001
2024	4,011
2025	3,969
2026	3,920
2027	3,908
2028	3,910
Thereafter	48,095
Total	68,814	$ 71,384
Summit Materials, LLC
Estimated amortization expense
2023 (three months)	1,001
2024	4,011
2025	3,969
2026	3,920
2027	3,908
2028	3,910
Thereafter	48,095
Total	$ 68,814	$ 71,384

ACQUISITIONS, DISPOSTIONS, GO_8

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Narrative (Details) - Argos USA - Forecast shares in Millions, $ in Billions	3 Months Ended
	Mar. 30, 2024 USD ($) cementPlant ready-mixPlant shares
Business Acquisition [Line Items]
Cash and stock transaction value	$ 3.2
Number of integrated cement plants | cementPlant	4
Number of ready-mix plants | ready-mixPlant	140
Cementos Argos S.A.
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 1.2
Business acquisition number of shares (in shares) | shares	54.7
Bridge Loan
Business Acquisition [Line Items]
Revolving credit commitment	$ 1.3
Summit Materials, LLC
Business Acquisition [Line Items]
Cash and stock transaction value	$ 3.2
Number of integrated cement plants | cementPlant	4
Number of ready-mix plants | ready-mixPlant	140
Summit Materials, LLC | Cementos Argos S.A.
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 1.2
Business acquisition number of shares (in shares) | shares	54.7
Summit Materials, LLC | Bridge Loan
Business Acquisition [Line Items]
Revolving credit commitment	$ 1.3

REVENUE RECOGNITION - By Produc

REVENUE RECOGNITION - By Product (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Revenue from External Customer [Line Items]
Total revenue	$ 794,797	$ 752,747	$ 1,959,335	$ 1,860,248
Aggregates
Revenue from External Customer [Line Items]
Total revenue	179,819	163,524	505,984	448,397
Cement
Revenue from External Customer [Line Items]
Total revenue	115,135	112,489	267,755	241,858
Ready-mix concrete
Revenue from External Customer [Line Items]
Total revenue	213,325	189,081	551,673	530,001
Asphalt
Revenue from External Customer [Line Items]
Total revenue	117,896	106,804	236,340	218,083
Paving and related services
Revenue from External Customer [Line Items]
Total revenue	110,370	120,327	226,928	249,547
Other
Revenue from External Customer [Line Items]
Total revenue	58,252	60,522	170,655	172,362
Summit Materials, LLC
Revenue from External Customer [Line Items]
Total revenue	794,797	752,747	1,959,335	1,860,248
Summit Materials, LLC | Aggregates
Revenue from External Customer [Line Items]
Total revenue	179,819	163,524	505,984	448,397
Summit Materials, LLC | Cement
Revenue from External Customer [Line Items]
Total revenue	115,135	112,489	267,755	241,858
Summit Materials, LLC | Ready-mix concrete
Revenue from External Customer [Line Items]
Total revenue	213,325	189,081	551,673	530,001
Summit Materials, LLC | Asphalt
Revenue from External Customer [Line Items]
Total revenue	117,896	106,804	236,340	218,083
Summit Materials, LLC | Paving and related services
Revenue from External Customer [Line Items]
Total revenue	110,370	120,327	226,928	249,547
Summit Materials, LLC | Other
Revenue from External Customer [Line Items]
Total revenue	$ 58,252	$ 60,522	$ 170,655	$ 172,362

REVENUE RECOGNITION - Schedule

REVENUE RECOGNITION - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 305,436	$ 215,766
Construction contract receivables	64,438	37,067
Retention receivables	13,165	11,048
Accounts receivable	383,039	263,881
Less: Allowance for doubtful accounts	(7,110)	(7,212)
Accounts receivable, net	$ 375,929	256,669
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
General collection and billing period for retention receivables	1 year
Summit Materials, LLC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 305,436	215,766
Construction contract receivables	64,438	37,067
Retention receivables	13,165	11,048
Accounts receivable	383,039	263,881
Less: Allowance for doubtful accounts	(7,110)	(7,212)
Accounts receivable, net	$ 375,929	$ 256,669
Summit Materials, LLC | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
General collection and billing period for retention receivables	1 year

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Inventory [Line Items]
Aggregate stockpiles	$ 165,071	$ 148,347
Finished goods	43,316	33,622
Work in process	11,220	8,191
Raw materials	23,529	22,331
Total	243,136	212,491
Summit Materials, LLC
Inventory [Line Items]
Aggregate stockpiles	165,071	148,347
Finished goods	43,316	33,622
Work in process	11,220	8,191
Raw materials	23,529	22,331
Total	$ 243,136	$ 212,491

ACCRUED EXPENSES (Details)

ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule Of Accrued Expenses [Line Items]
Interest	$ 10,677	$ 24,625
Payroll and benefits	48,595	34,485
Finance lease obligations	3,399	6,959
Insurance	23,874	18,127
Non-income taxes	14,349	4,360
Deferred asset purchase payments	5,892	5,131
Professional fees	11,980	924
Other	28,853	25,356
Total	147,619	119,967
Summit Materials, LLC
Schedule Of Accrued Expenses [Line Items]
Interest	10,677	24,625
Payroll and benefits	48,595	34,485
Finance lease obligations	3,399	6,959
Insurance	23,874	18,127
Non-income taxes	14,835	5,101
Deferred asset purchase payments	5,892	5,131
Professional fees	11,980	924
Other	28,853	25,356
Total	$ 148,105	$ 120,708

DEBT - Schedule of Debt (Detail

DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total debt	$ 1,501,492	$ 1,504,549
Current portion of long-term debt	3,822	5,096
Long-term debt	1,497,670	1,499,453
Gross amount	1,505,738
Debt discount	4,246
Term Loan, due 2027
Debt Instrument [Line Items]
Total debt	501,492	504,549
Gross amount	505,700	509,600
Debt discount	4,200	5,000
Summit Materials, LLC
Debt Instrument [Line Items]
Total debt	1,501,492	1,504,549
Current portion of long-term debt	3,822	5,096
Long-term debt	1,497,670	1,499,453
Gross amount	1,505,738
Debt discount	4,246
Summit Materials, LLC | Term Loan, due 2027
Debt Instrument [Line Items]
Total debt	501,492	504,549
Gross amount	505,700	509,600
Debt discount	4,200	5,000
Senior Notes | 6 1/2% Senior Notes, due 2027
Debt Instrument [Line Items]
Total debt	$ 300,000	300,000
Debt instrument interest rate (as a percent)	6.50%
Senior Notes | 5 1/4% Senior Notes Due 2029
Debt Instrument [Line Items]
Total debt	$ 700,000	700,000
Debt instrument interest rate (as a percent)	5.25%
Senior Notes | Summit Materials, LLC | 6 1/2% Senior Notes, due 2027
Debt Instrument [Line Items]
Total debt	$ 300,000	300,000
Debt instrument interest rate (as a percent)	6.50%
Senior Notes | Summit Materials, LLC | 5 1/4% Senior Notes Due 2029
Debt Instrument [Line Items]
Total debt	$ 700,000	$ 700,000
Debt instrument interest rate (as a percent)	5.25%

DEBT - Schedule of Contractual

DEBT - Schedule of Contractual Payments of Long-Term Debt (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Debt Instrument [Line Items]
2023 (three months)	$ 1,274
2024	3,822
2025	6,369
2026	5,096
2027	789,177
2028	0
Thereafter	700,000
Total	1,505,738
Less: Original issue net discount	(4,246)
Less: Capitalized loan costs	(9,601)
Total debt	1,491,891
Summit Materials, LLC
Debt Instrument [Line Items]
2023 (three months)	1,274
2024	3,822
2025	6,369
2026	5,096
2027	789,177
2028	0
Thereafter	700,000
Total	1,505,738
Less: Original issue net discount	(4,246)
Less: Capitalized loan costs	(9,601)
Total debt	$ 1,491,891

DEBT - Senior Notes (Details)

DEBT - Senior Notes (Details) - USD ($)	Aug. 11, 2020	Mar. 15, 2019	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt			$ 1,501,492,000	$ 1,504,549,000
Issuers | 5 1/4% Senior Notes Due 2029
Debt Instrument [Line Items]
Long-term debt	$ 700,000,000
Senior notes, interest rate (as a percent)	5.25%
Proceeds from debt issuances	$ 690,400,000
Issuers | 6 1/2% Senior Notes, due 2027
Debt Instrument [Line Items]
Long-term debt		$ 300,000,000
Senior notes, interest rate (as a percent)		6.50%
Senior Notes | 5 1/4% Senior Notes Due 2029
Debt Instrument [Line Items]
Long-term debt			$ 700,000,000	700,000,000
Senior notes, interest rate (as a percent)			5.25%
Senior Notes | 6 1/2% Senior Notes, due 2027
Debt Instrument [Line Items]
Long-term debt			$ 300,000,000	$ 300,000,000
Senior notes, interest rate (as a percent)			6.50%
Senior Notes | Issuers | 5 1/4% Senior Notes Due 2029
Debt Instrument [Line Items]
Percentage of par value of senior notes	100%
Senior Notes | Issuers | 6 1/2% Senior Notes, due 2027
Debt Instrument [Line Items]
Percentage of par value of senior notes		100%
Proceeds net of related fees and expenses		$ 296,300,000

DEBT - Senior Secured Credit Fa

DEBT - Senior Secured Credit Facilities (Details) - USD ($)			1 Months Ended	9 Months Ended		12 Months Ended
	Jan. 10, 2023	Dec. 14, 2022	Sep. 30, 2023	Sep. 30, 2023	Oct. 01, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Repayments of term loan				$ 8,520,000	$ 113,769,000
Summit Materials, LLC
Debt Instrument [Line Items]
Repayments of term loan				8,520,000	$ 113,769,000
Term Loan, due 2024 | Summit Materials, LLC
Debt Instrument [Line Items]
Debt instrument, face amount			$ 505,700,000	$ 505,700,000
Quarterly principal repayments percentage				0.25%
Effective interest rate			8.57%	8.57%
Revolving Credit Facility | Summit Materials, LLC
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 395,000,000		$ 395,000,000	$ 395,000,000
Amount outstanding			0	0		$ 0
Revolving Credit Facility | Summit Materials, LLC | Secured Overnight Financing Rate Adjustment
Debt Instrument [Line Items]
Basis spread on variable rate	0.10%
Revolving Credit Facility | Summit Materials, LLC | Secured Overnight Financing Rate Adjustment | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0%
Term Loan, due 2027
Debt Instrument [Line Items]
Debt instrument, face amount			$ 505,700,000	$ 505,700,000
Term Loan, due 2027 | Summit Materials, LLC
Debt Instrument [Line Items]
Debt instrument, face amount		$ 509,600,000
Effective interest rate			8.57%	8.57%
Repayments of term loan						$ 95,600,000
Term Loan, due 2027 | Summit Materials, LLC | Base Rate or SOFR
Debt Instrument [Line Items]
Basis spread on variable rate		2%
Term Loan, due 2027 | Summit Materials, LLC | Base Rate or SOFR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1%
Term Loan, due 2027 | Summit Materials, LLC | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		3%
Term Loan, due 2027 | Summit Materials, LLC | Secured Overnight Financing Rate Adjustment
Debt Instrument [Line Items]
Basis spread on variable rate		0.10%
Term Loan, due 2027 | Summit Materials, LLC | Secured Overnight Financing Rate Adjustment | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0%
Senior Secured Credit Facilities | Summit Materials, LLC
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 395,000,000	$ 395,000,000
Quarterly principal repayments percentage				0.25%
Amount outstanding			20,900,000	$ 20,900,000
Remaining borrowing capacity			374,100,000	$ 374,100,000
First lien leverage ratio				4.75
Bridge Loan | Argos North America Corp
Debt Instrument [Line Items]
Commitment amount			$ 1,300,000,000

DEBT - Schedule of Activity for

DEBT - Schedule of Activity for Deferred Financing Fees (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Accumulated Amortization [Roll Forward]
Beginning balance	$ 11,489	$ 13,049
Loan origination fees	1,566
Amortization	(1,838)	(2,028)
Write off of deferred financing fees	(160)
Ending balance	11,057	11,021
Summit Materials, LLC
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Accumulated Amortization [Roll Forward]
Beginning balance	11,489	13,049
Loan origination fees	1,566
Amortization	(1,838)	(2,028)
Write off of deferred financing fees	(160)
Ending balance	$ 11,057	$ 11,021

DEBT - Other (Details)

DEBT - Other (Details) - CAD ($)	Jan. 15, 2015	Sep. 30, 2023	Dec. 31, 2022
Canadian Subsidiary Credit Agreement, Operating Activities
Debt Instrument [Line Items]
Revolving credit commitment	$ 6,000,000
Canadian Subsidiary Credit Agreement, Capital Equipment
Debt Instrument [Line Items]
Revolving credit commitment	500,000
Canadian Subsidiary Credit Agreement, Guarantees
Debt Instrument [Line Items]
Revolving credit commitment	1,500,000
Canadian Subsidiary Credit Agreement, Foreign Exchange Facility
Debt Instrument [Line Items]
Revolving credit commitment	$ 10,000,000
Canadian Subsidiary Credit Agreement
Debt Instrument [Line Items]
Amount outstanding		$ 0	$ 0
Prime rate | Canadian Subsidiary Credit Agreement, Operating Activities
Debt Instrument [Line Items]
Basis spread on variable rate	0.20%
Prime rate | Canadian Subsidiary Credit Agreement, Capital Equipment
Debt Instrument [Line Items]
Basis spread on variable rate	0.20%
Summit Materials, LLC | Canadian Subsidiary Credit Agreement, Operating Activities
Debt Instrument [Line Items]
Revolving credit commitment	$ 6,000,000
Summit Materials, LLC | Canadian Subsidiary Credit Agreement, Capital Equipment
Debt Instrument [Line Items]
Revolving credit commitment	500,000
Summit Materials, LLC | Canadian Subsidiary Credit Agreement, Guarantees
Debt Instrument [Line Items]
Revolving credit commitment	1,500,000
Summit Materials, LLC | Canadian Subsidiary Credit Agreement, Foreign Exchange Facility
Debt Instrument [Line Items]
Revolving credit commitment	$ 10,000,000
Summit Materials, LLC | Canadian Subsidiary Credit Agreement
Debt Instrument [Line Items]
Amount outstanding		$ 0	$ 0
Summit Materials, LLC | Prime rate | Canadian Subsidiary Credit Agreement, Operating Activities
Debt Instrument [Line Items]
Basis spread on variable rate	0.20%
Summit Materials, LLC | Prime rate | Canadian Subsidiary Credit Agreement, Capital Equipment
Debt Instrument [Line Items]
Basis spread on variable rate	0.20%

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 02, 2023	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022	Dec. 31, 2015	Dec. 31, 2022
Income Taxes [Line Items]
Income tax expense		$ 23,908,000	$ 24,829,000	$ 39,923,000	$ 74,033,000
Valuation allowance		1,113,000		1,113,000			$ 1,113,000
Income tax provision, interest or penalties recognized		0	0	0	0
Tax receivable agreement (benefit)		(153,080,000)	0	(153,080,000)	954,000
Distributions to LP unitholders				4,500,000	34,200,000
Summit Holdings LP
Income Taxes [Line Items]
Distributions to LP unitholders				$ 100,000	400,000
Summit Holdings LP | Tax Receivable Agreement
Income Taxes [Line Items]
Percentage of benefits to be paid on tax receivable agreement				85%		85%
Summit Materials, LLC
Income Taxes [Line Items]
Income tax expense		8,451,000	7,147,000	$ 15,103,000	19,557,000
Income tax provision, interest or penalties recognized		0	$ 0	0	$ 0
Current portion of tax receivable agreement interests		4,400,000		4,400,000			0
Tax receivable agreement interest, net of current portion		118,535,000		118,535,000			$ 0
Summit Materials, LLC | Tax Receivable Agreement
Income Taxes [Line Items]
Tax receivable agreement, rights and interests acquisition, consideration		122,900,000
Current portion of tax receivable agreement interests		4,400,000		4,400,000
Tax receivable agreement interest, net of current portion		$ 118,500,000		$ 118,500,000
Common Class A
Income Taxes [Line Items]
Exchanges during period (in shares)				176,258	2,000
Common Class A | Tax Receivable Agreement
Income Taxes [Line Items]
Exchanges during period (in shares)				176,258
Common Class A | Tax Receivable Agreement | Subsequent Event
Income Taxes [Line Items]
Exchanges during period (in shares)	345,554
Tax receivable agreement, liability reduction	$ 19,300,000
Common Class A | Summit Materials, LLC | Tax Receivable Agreement | Subsequent Event
Income Taxes [Line Items]
Tax receivable agreement, rights and interests acquisition, consideration	$ 9,500,000

INCOME TAXES - TRA Liability (D

INCOME TAXES - TRA Liability (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Apr. 01, 2023	Oct. 01, 2022	Sep. 30, 2023
Tax Receivable Agreement, Liability [Roll Forward]
Tax receivable agreement liability, beginning balance		$ 327,812		$ 327,812
LP unit exchanges during period	$ 0	0	$ 0
Total	52,143			52,143
Tax Receivable Agreement
Tax Receivable Agreement, Liability [Roll Forward]
Tax receivable agreement liability, beginning balance		$ 328,356		328,356
LP unit exchanges during period				1,146
Purchase of TRA interests				(122,935)
TRA liability reduction				(153,080)
TRA liability payments				(544)
Total	52,943			52,943
Less current portion	800			800
Tax receivable agreement liability, noncurrent	$ 52,143			$ 52,143

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Reconciliation of basic to diluted loss per share
Net income attributable to Summit Inc.	$ 230,045	$ 86,489	$ 282,878	$ 242,310
Diluted net income attributable to Summit Inc.	$ 230,045	$ 86,489	$ 282,878	$ 242,310
LP Units
Reconciliation of basic to diluted loss per share
Anti dilutive shares excluded from calculation of earnings per share (in shares)	1,303,990	1,312,795	1,308,417	1,313,601
Common Class A And Restricted Stock
Reconciliation of basic to diluted loss per share
Weighted average shares of Class A stock outstanding (in shares)	119,013,331	119,896,272	118,874,967	120,345,015
Weighted average shares outstanding (in shares)	119,013,331	119,896,272	118,874,967	120,345,015
Basic earning per share (in usd per share)	$ 1.93	$ 0.72	$ 2.38	$ 2.01
Common Class A
Reconciliation of basic to diluted loss per share
Weighted average shares of Class A stock outstanding (in shares)	118,928,799	119,753,806	118,780,523	120,196,211
Weighted average shares outstanding (in shares)	118,928,799	119,753,806	118,780,523	120,196,211
Basic earning per share (in usd per share)	$ 1.93	$ 0.72	$ 2.38	$ 2.01
Add: warrants (in shares)	15,578	10,790	13,943	12,202
Weighted average dilutive shares outstanding (in shares)	119,725,693	120,383,312	119,558,974	121,078,150
Diluted earning per share (in usd per share)	$ 1.92	$ 0.72	$ 2.37	$ 2
Common Class A | Add: stock options
Reconciliation of basic to diluted loss per share
Add: share-based payment arrangements (in shares)	122,753	78,799	108,024	93,993
Common Class A | Add: restricted stock units
Reconciliation of basic to diluted loss per share
Add: share-based payment arrangements (in shares)	356,286	279,684	376,221	485,174
Common Class A | Add: performance stock units
Reconciliation of basic to diluted loss per share
Add: share-based payment arrangements (in shares)	217,745	117,767	185,819	141,766
Restricted Stock
Reconciliation of basic to diluted loss per share
Add: Nonvested restricted stock awards of retirement eligible shares (in shares)	84,532	142,466	94,444	148,804

STOCKHOLDERS' EQUITY_MEMBERS'_3

STOCKHOLDERS' EQUITY/MEMBERS' INTEREST - Narrative (Details) - USD ($)	1 Months Ended	9 Months Ended
	Nov. 02, 2023	Sep. 30, 2023	Oct. 01, 2022	Dec. 31, 2022	Mar. 31, 2022
Summit Holdings LP
Schedule of Capitalization, Equity [Line Items]
Noncontrolling interest elimination (as a percent)		0.90%		1.10%
Common Class A
Schedule of Capitalization, Equity [Line Items]
LP Unit exchanges (in shares)		176,258	2,000
Share repurchase program, authorized amount					$ 250,000,000
Remaining authorized repurchase amount		$ 149,000,000
Common Class A | Tax Receivable Agreement
Schedule of Capitalization, Equity [Line Items]
LP Unit exchanges (in shares)		176,258
Common Class A | Subsequent Event | Tax Receivable Agreement
Schedule of Capitalization, Equity [Line Items]
LP Unit exchanges (in shares)	345,554

STOCKHOLDERS' EQUITY_MEMBERS'_4

STOCKHOLDERS' EQUITY/MEMBERS' INTEREST - Equity Offerings (Details) - shares	9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Dec. 31, 2022	Jan. 01, 2022
Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	118,408,655	120,684,322
Exchanges during period (in shares)	176,258	2,000
Stock option exercises (in shares)	5,407	10,098
Repurchases of common stock, (in shares)		(3,427,510)
Other equity transactions (in shares)	522,630	1,097,273
Ending balance (in shares)	119,112,950	118,366,183
Summit Materials, Inc. and Summit Holdings, LP
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	119,720,659	121,998,328
Exchanges during period (in shares)	0	0
Stock option exercises (in shares)	5,407	10,098
Repurchases of common stock, (in shares)		(3,427,510)
Other equity transactions (in shares)	522,630	1,097,273
Ending balance (in shares)	120,248,696	119,678,189
LP Units | Summit Holdings LP
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Number of LP Units outstanding, beginning balance (in shares)	1,312,004	1,314,006
Number of LP Units exchanged (in shares)	(176,258)	(2,000)
Number of LP Units outstanding, ending balance (in shares)	1,135,746	1,312,006
Summit Materials Inc
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ownership percentage	99.10%	98.90%	98.90%	98.90%

STOCKHOLDERS' EQUITY_MEMBERS'_5

STOCKHOLDERS' EQUITY/MEMBERS' INTEREST - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022
Changes in each component of accumulated other comprehensive loss
Beginning balance	$ 2,011,990	$ 1,823,212
Foreign currency translation adjustment, net of tax	212	(10,553)
Ending balance	2,307,733	1,971,224
Summit Materials, LLC
Changes in each component of accumulated other comprehensive loss
Beginning balance	2,143,150	1,884,944
Foreign currency translation adjustment, net of tax	295	(14,113)
Ending balance	2,306,102	2,051,226
Change in retirement plans
Changes in each component of accumulated other comprehensive loss
Beginning balance	6,356	1,508
Ending balance	6,356	1,508
Change in retirement plans | Summit Materials, LLC
Changes in each component of accumulated other comprehensive loss
Beginning balance	(762)	(7,243)
Ending balance	(762)	(7,243)
Foreign currency translation adjustments
Changes in each component of accumulated other comprehensive loss
Beginning balance	(3,272)	5,575
Foreign currency translation adjustment, net of tax	212	(10,553)
Ending balance	(3,060)	(4,978)
Foreign currency translation adjustments | Summit Materials, LLC
Changes in each component of accumulated other comprehensive loss
Beginning balance	(20,614)	(8,783)
Foreign currency translation adjustment, net of tax	295	(14,113)
Ending balance	(20,319)	(22,896)
Accumulated Other Comprehensive Income
Changes in each component of accumulated other comprehensive loss
Beginning balance	3,084	7,083
Ending balance	3,296	(3,470)
Accumulated Other Comprehensive Income | Summit Materials, LLC
Changes in each component of accumulated other comprehensive loss
Beginning balance	(21,376)	(16,026)
Ending balance	$ (21,081)	$ (30,139)

SUPPLEMENTAL CASH FLOW INFORM_3

SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022
Cash payments:
Interest	$ 88,400	$ 70,184
Payments for income taxes, net	13,602	15,888
Operating cash payments on operating leases	7,578	7,112
Operating cash payments on finance leases	400	890
Finance cash payments on finance leases	6,137	13,465
Non cash investing and financing activities:
Accrued liabilities for purchases of property, plant and equipment	22,244	16,778
Right of use assets obtained in exchange for operating lease obligations	6,371	13,302
Right of use assets obtained in exchange for finance leases obligations	413	258
Exchange of LP Units to shares of Class A common stock	5,527	62
Summit Materials, LLC
Cash payments:
Interest	88,400	70,184
Payments for income taxes, net	13,602	15,888
Operating cash payments on operating leases	7,578	7,112
Operating cash payments on finance leases	400	890
Finance cash payments on finance leases	6,137	13,465
Non cash investing and financing activities:
Accrued liabilities for purchases of property, plant and equipment	22,244	16,778
Right of use assets obtained in exchange for operating lease obligations	6,371	13,302
Right of use assets obtained in exchange for finance leases obligations	$ 413	$ 258

LEASES (Details)

LEASES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022	Dec. 31, 2022
Lease, Cost [Abstract]
Operating lease cost	$ 2,903	$ 2,398	$ 8,241	$ 7,181
Variable lease cost	39	70	103	225
Short-term lease cost	13,238	11,916	30,692	31,097
Financing lease cost:
Amortization of right-of-use assets	483	1,235	2,015	4,598
Interest on lease liabilities	118	239	399	879
Total lease cost	16,781	15,858	41,450	43,980
Operating leases:
Operating lease right-of-use assets	38,380		38,380		$ 37,889
Current operating lease liabilities	8,745		8,745		7,296
Noncurrent operating lease liabilities	34,838		34,838		35,737
Total operating lease liabilities	43,583		43,583		43,033
Finance leases:
Property and equipment, gross	20,030		20,030		32,119
Less accumulated depreciation	$ (9,893)		$ (9,893)		$ (14,992)
Finance lease, right-of-use asset, statement of financial position [Extensible List]	Property, plant and equipment, net		Property, plant and equipment, net		Property, plant and equipment, net
Property and equipment, net	$ 10,137		$ 10,137		$ 17,127
Finance lease, liability, current, statement of financial position [Extensible Enumeration]	Accrued expenses		Accrued expenses		Accrued expenses
Current finance lease liabilities	$ 3,399		$ 3,399		$ 6,959
Finance lease, liability, noncurrent, statement of financial position [Extensible Enumeration]	Other noncurrent liabilities		Other noncurrent liabilities		Other noncurrent liabilities
Long-term finance lease liabilities	$ 5,180		$ 5,180		$ 7,167
Total finance lease liabilities	$ 8,579		$ 8,579		$ 14,126
Weighted average remaining lease term (years):
Operating leases	8 years 4 months 24 days		8 years 4 months 24 days		9 years 1 month 6 days
Finance lease	3 years 4 months 24 days		3 years 4 months 24 days		2 years 9 months 18 days
Weighted average discount rate:
Operating leases	5.10%		5.10%		4.70%
Finance leases	5.90%		5.90%		5.30%
Operating Leases
2023 (three months)	$ 2,739		$ 2,739
2024	10,294		10,294
2025	8,165		8,165
2026	6,414		6,414
2027	4,760		4,760
2028	3,450		3,450
Thereafter	17,600		17,600
Total lease payments	53,422		53,422
Less imputed interest	(9,839)		(9,839)
Present value of lease payments	43,583		43,583		$ 43,033
Finance Leases
2023 (three months)	1,283		1,283
2024	3,052		3,052
2025	2,435		2,435
2026	990		990
2027	760		760
2028	513		513
Thereafter	570		570
Total lease payments	9,603		9,603
Less imputed interest	(1,024)		(1,024)
Present value of lease payments	8,579		8,579		14,126
Summit Materials, LLC
Lease, Cost [Abstract]
Operating lease cost	2,903	2,398	8,241	7,181
Variable lease cost	39	70	103	225
Short-term lease cost	13,238	11,916	30,692	31,097
Financing lease cost:
Amortization of right-of-use assets	483	1,235	2,015	4,598
Interest on lease liabilities	118	239	399	879
Total lease cost	16,781	$ 15,858	41,450	$ 43,980
Operating leases:
Operating lease right-of-use assets	38,380		38,380		37,889
Current operating lease liabilities	8,745		8,745		7,296
Noncurrent operating lease liabilities	34,838		34,838		35,737
Total operating lease liabilities	43,583		43,583		43,033
Finance leases:
Property and equipment, gross	20,030		20,030		32,119
Less accumulated depreciation	$ (9,893)		$ (9,893)		$ (14,992)
Finance lease, right-of-use asset, statement of financial position [Extensible List]	Property, plant and equipment, net		Property, plant and equipment, net		Property, plant and equipment, net
Property and equipment, net	$ 10,137		$ 10,137		$ 17,127
Finance lease, liability, current, statement of financial position [Extensible Enumeration]	Accrued expenses		Accrued expenses		Accrued expenses
Current finance lease liabilities	$ 3,399		$ 3,399		$ 6,959
Finance lease, liability, noncurrent, statement of financial position [Extensible Enumeration]	Other noncurrent liabilities		Other noncurrent liabilities		Other noncurrent liabilities
Long-term finance lease liabilities	$ 5,180		$ 5,180		$ 7,167
Total finance lease liabilities	$ 8,579		$ 8,579		$ 14,126
Weighted average remaining lease term (years):
Operating leases	8 years 4 months 24 days		8 years 4 months 24 days		9 years 1 month 6 days
Finance lease	3 years 4 months 24 days		3 years 4 months 24 days		2 years 9 months 18 days
Weighted average discount rate:
Operating leases	5.10%		5.10%		4.70%
Finance leases	5.90%		5.90%		5.30%
Operating Leases
2023 (three months)	$ 2,739		$ 2,739
2024	10,294		10,294
2025	8,165		8,165
2026	6,414		6,414
2027	4,760		4,760
2028	3,450		3,450
Thereafter	17,600		17,600
Total lease payments	53,422		53,422
Less imputed interest	(9,839)		(9,839)
Present value of lease payments	43,583		43,583		$ 43,033
Finance Leases
2023 (three months)	1,283		1,283
2024	3,052		3,052
2025	2,435		2,435
2026	990		990
2027	760		760
2028	513		513
Thereafter	570		570
Total lease payments	9,603		9,603
Less imputed interest	(1,024)		(1,024)
Present value of lease payments	$ 8,579		$ 8,579		$ 14,126

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Anticipated costs	$ 123.1	$ 124.9
Term of purchase commitments	1 year
Site Restoration Obligations | Other noncurrent liabilities
Loss Contingencies [Line Items]
Site restoration obligation, non-current	$ 36.3	36.3
Site Restoration Obligations | Accrued expenses.
Loss Contingencies [Line Items]
Site restoration obligation, current	$ 5.3	4
Summit Materials, LLC
Loss Contingencies [Line Items]
Term of purchase commitments	1 year
Summit Materials, LLC | Site Restoration Obligations
Loss Contingencies [Line Items]
Anticipated costs	$ 123.1	124.9
Summit Materials, LLC | Site Restoration Obligations | Other noncurrent liabilities
Loss Contingencies [Line Items]
Site restoration obligation, non-current	36.3	36.3
Summit Materials, LLC | Site Restoration Obligations | Accrued expenses.
Loss Contingencies [Line Items]
Site restoration obligation, current	$ 5.3	$ 4

FAIR VALUE - Fair Value Measure

FAIR VALUE - Fair Value Measurements (Details) - Level 3	9 Months Ended
	Sep. 30, 2023 USD ($)	Oct. 01, 2022 USD ($)	Dec. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of acquisition-related liabilities and accrued expenses - contingent consideration	$ 139,000		$ 336,000
Acquisition-related liabilities and Other noncurrent liabilities - Contingent consideration	9,296,000		4,981,000
Adjustment to contingent consideration	0	$ 0
Summit Materials, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of acquisition-related liabilities and accrued expenses - contingent consideration	139,000		336,000
Acquisition-related liabilities and Other noncurrent liabilities - Contingent consideration	9,296,000		$ 4,981,000
Adjustment to contingent consideration	$ 0	$ 0
Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration fair value measurement input	0.100
Discount Rate | Summit Materials, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration fair value measurement input	0.100

FAIR VALUE - Carrying Value and

FAIR VALUE - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial Instruments
Current portion of long-term debt	$ 3,822	$ 5,096
Summit Materials, LLC
Financial Instruments
Current portion of long-term debt	3,822	5,096
Level 1 | Fair Value
Financial Instruments
Long-term debt	1,434,238	1,447,673
Level 1 | Carrying Value
Financial Instruments
Long-term debt	1,501,492	1,504,549
Level 1 | Summit Materials, LLC
Financial Instruments
Current portion of long-term debt	3,800	5,100
Level 1 | Summit Materials, LLC | Fair Value
Financial Instruments
Long-term debt	1,434,238	1,447,673
Level 1 | Summit Materials, LLC | Carrying Value
Financial Instruments
Long-term debt	1,501,492	1,504,549
Level 3 | Fair Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	6,889	13,382
Long term portion of deferred consideration and noncompete obligations	18,337	24,070
Level 3 | Carrying Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	6,889	13,382
Long term portion of deferred consideration and noncompete obligations	18,337	24,070
Level 3 | Summit Materials, LLC | Fair Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	6,889	13,382
Long term portion of deferred consideration and noncompete obligations	18,337	24,070
Level 3 | Summit Materials, LLC | Carrying Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	6,889	13,382
Long term portion of deferred consideration and noncompete obligations	18,337	24,070
Fair Value, Inputs, Level 1 | Fair Value
Financial Instruments
Current portion of long-term debt	$ 3,800	$ 5,100

SEGMENT INFORMATION (Details)

SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Oct. 01, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Oct. 01, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			3
Number of reportable segments | segment			3
Total revenue	$ 794,797	$ 752,747	$ 1,959,335	$ 1,860,248
Income from operations before taxes	256,633	112,480	326,164	319,650
Interest expense	28,013	21,980	83,335	62,728
Depreciation, depletion and amortization	56,691	51,439	160,921	148,373
Accretion	761	694	2,212	2,110
Loss on debt financings	0	0	493	0
Tax receivable agreement (benefit) expense	(153,080)	0	(153,080)	954
Gain on sale of businesses	0	(4,115)	0	(174,373)
Non-cash compensation	5,192	4,902	15,116	15,058
Argos USA acquisition and integration costs	17,859	0	17,859	0
Other	(3,550)	(2,492)	(11,555)	(2,315)
Total Adjusted EBITDA	208,519	184,888	441,465	372,185
Total purchases of property, plant and equipment			182,182	189,008
Total depreciation, depletion, amortization and accretion	57,452	52,133	163,133	150,483
Total assets	4,364,964		4,364,964		$ 4,255,692
Operating segment
Segment Reporting Information [Line Items]
Total purchases of property, plant and equipment			172,693	181,081
Total depreciation, depletion, amortization and accretion	56,430	51,312	160,089	148,143
Total assets	4,038,071		4,038,071		3,590,603
Corporate and other
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	(9,771)	(4,109)	(33,371)	(26,400)
Total purchases of property, plant and equipment			9,489	7,927
Total depreciation, depletion, amortization and accretion	1,022	821	3,044	2,340
Total assets	326,893		326,893		665,089
West
Segment Reporting Information [Line Items]
Total revenue	496,638	439,411	1,178,258	1,075,393
West | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	117,846	98,281	255,041	215,617
Total purchases of property, plant and equipment			98,025	85,462
Total depreciation, depletion, amortization and accretion	28,701	24,908	83,218	71,495
Total assets	1,932,418		1,932,418		1,565,776
East
Segment Reporting Information [Line Items]
Total revenue	176,840	193,421	493,766	525,064
East | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	50,089	44,119	116,558	98,949
Total purchases of property, plant and equipment			45,754	65,116
Total depreciation, depletion, amortization and accretion	15,586	15,445	46,839	48,655
Total assets	1,191,237		1,191,237		1,151,223
Cement
Segment Reporting Information [Line Items]
Total revenue	121,319	119,915	287,311	259,791
Cement | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	50,355	46,597	103,237	84,019
Total purchases of property, plant and equipment			28,914	30,503
Total depreciation, depletion, amortization and accretion	12,143	10,959	30,032	27,993
Total assets	914,416		$ 914,416		873,604
Summit Materials, LLC
Segment Reporting Information [Line Items]
Number of operating segments | segment			3
Number of reportable segments | segment			3
Total revenue	794,797	752,747	$ 1,959,335	1,860,248
Income from operations before taxes	103,551	112,480	173,082	320,604
Interest expense	28,013	21,980	83,335	62,728
Depreciation, depletion and amortization	56,691	51,439	160,921	148,373
Accretion	761	694	2,212	2,110
Loss on debt financings	0	0	493	0
Gain on sale of businesses	0	(4,115)	0	(174,373)
Non-cash compensation	5,192	4,902	15,116	15,058
Argos USA acquisition and integration costs	17,859	0	17,859	0
Other	(3,548)	(2,492)	(11,553)	(2,315)
Total Adjusted EBITDA	208,519	184,888	441,465	372,185
Total purchases of property, plant and equipment			182,182	189,008
Total depreciation, depletion, amortization and accretion	57,452	52,133	163,133	150,483
Total assets	4,371,058		4,371,058		4,119,706
Summit Materials, LLC | Operating segment
Segment Reporting Information [Line Items]
Total purchases of property, plant and equipment			172,693	181,081
Total depreciation, depletion, amortization and accretion	56,430	51,312	160,089	148,143
Total assets	4,038,071		4,038,071		3,590,603
Summit Materials, LLC | Corporate and other
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	(9,771)	(4,109)	(33,371)	(26,400)
Total purchases of property, plant and equipment			9,489	7,927
Total depreciation, depletion, amortization and accretion	1,022	821	3,044	2,340
Total assets	332,987		332,987		529,103
Summit Materials, LLC | West
Segment Reporting Information [Line Items]
Total revenue	496,638	439,411	1,178,258	1,075,393
Summit Materials, LLC | West | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	117,846	98,281	255,041	215,617
Total purchases of property, plant and equipment			98,025	85,462
Total depreciation, depletion, amortization and accretion	28,701	24,908	83,218	71,495
Total assets	1,932,418		1,932,418		1,565,776
Summit Materials, LLC | East
Segment Reporting Information [Line Items]
Total revenue	176,840	193,421	493,766	525,064
Summit Materials, LLC | East | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	50,089	44,119	116,558	98,949
Total purchases of property, plant and equipment			45,754	65,116
Total depreciation, depletion, amortization and accretion	15,586	15,445	46,839	48,655
Total assets	1,191,237		1,191,237		1,151,223
Summit Materials, LLC | Cement
Segment Reporting Information [Line Items]
Total revenue	121,319	119,915	287,311	259,791
Summit Materials, LLC | Cement | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	50,355	46,597	103,237	84,019
Total purchases of property, plant and equipment			28,914	30,503
Total depreciation, depletion, amortization and accretion	12,143	$ 10,959	30,032	$ 27,993
Total assets	$ 914,416		$ 914,416		$ 873,604

GUARANTOR AND NON-GUARANTOR F_3

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Schedule of Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 31, 2022	Oct. 01, 2022	Jul. 02, 2022	Apr. 02, 2022	Jan. 01, 2022
Current assets:
Cash and cash equivalents	$ 197,475			$ 520,451
Accounts receivable, net	375,929			256,669
Cost and estimated earnings in excess of billings	40,985			6,510
Inventories	243,136			212,491
Total current assets	877,203			1,018,376
Property, plant and equipment, net	1,974,532			1,813,702
Goodwill	1,241,472			1,132,546
Intangible assets, net	68,814			71,384
Operating lease right-of-use assets	38,380			37,889
Total assets	4,364,964			4,255,692
Current liabilities:
Current portion of debt	3,822			5,096
Current portion of acquisition-related liabilities	7,028			13,718
Accounts payable	173,127			104,031
Current operating lease liabilities	8,745			7,296
Billings in excess of costs and estimated earnings	8,539			5,739
Total current liabilities	348,880			255,847
Long-term debt	1,488,069			1,488,569
Acquisition-related liabilities	27,633			29,051
Noncurrent operating lease liabilities	34,838			35,737
Total liabilities	2,057,231			2,243,702
Total liabilities and members' interest	4,364,964			4,255,692
Summit Materials, LLC
Current assets:
Cash and cash equivalents	192,996			520,451
Accounts receivable, net	375,929			256,669
Intercompany receivables	0			0
Cost and estimated earnings in excess of billings	40,985			6,510
Inventories	243,136			212,491
Other current assets	24,078			22,255
Total current assets	877,124			1,018,376
Property, plant and equipment, net	1,974,532			1,813,702
Goodwill	1,242,472			1,133,546
Intangible assets, net	68,814			71,384
Operating lease right-of-use assets	38,380			37,889
Other assets	169,736			44,809
Total assets	4,371,058			4,119,706
Current liabilities:
Current portion of debt	3,822			5,096
Current portion of acquisition-related liabilities	7,028			13,718
Accounts payable	172,982			104,430
Accrued expenses	148,105			120,708
Current operating lease liabilities	8,745			7,296
Intercompany payables	0			0
Billings in excess of costs and estimated earnings	8,539			5,739
Total current liabilities	349,221			256,987
Long-term debt	1,488,069			1,488,569
Acquisition-related liabilities	27,633			29,051
Noncurrent operating lease liabilities	34,838			35,737
Other noncurrent liabilities	165,195			166,212
Total liabilities	2,064,956			1,976,556
Total member's interest	2,306,102	$ 2,215,304	$ 2,105,146	2,143,150	$ 2,051,226	$ 2,039,348	$ 1,797,061	$ 1,884,944
Total liabilities and members' interest	4,371,058			4,119,706
Summit Materials, LLC | Eliminations
Current assets:
Cash and cash equivalents	(13,065)			(7,018)
Accounts receivable, net	(132)			(25)
Intercompany receivables	(2,454,543)			(2,267,134)
Cost and estimated earnings in excess of billings	0			0
Inventories	0			0
Other current assets	0			0
Total current assets	(2,467,740)			(2,274,177)
Property, plant and equipment, net	0			0
Goodwill	0			0
Intangible assets, net	0			0
Operating lease right-of-use assets	0			0
Other assets	(5,352,848)			(4,760,543)
Total assets	(7,820,588)			(7,034,720)
Current liabilities:
Current portion of debt	0			0
Current portion of acquisition-related liabilities	0			0
Accounts payable	(132)			(25)
Accrued expenses	(13,065)			(7,018)
Current operating lease liabilities	0			0
Intercompany payables	(2,454,543)			(2,267,134)
Billings in excess of costs and estimated earnings	0			0
Total current liabilities	(2,467,740)			(2,274,177)
Long-term debt	0			0
Acquisition-related liabilities	0			0
Noncurrent operating lease liabilities	0			0
Other noncurrent liabilities	(164,421)			(164,421)
Total liabilities	(2,632,161)			(2,438,598)
Total member's interest	(5,188,427)			(4,596,122)
Total liabilities and members' interest	(7,820,588)			(7,034,720)
Summit Materials, LLC | Issuers | Reportable Legal Entities
Current assets:
Cash and cash equivalents	169,370			498,307
Accounts receivable, net	2,232			1,528
Intercompany receivables	302,181			329,744
Cost and estimated earnings in excess of billings	0			0
Inventories	0			0
Other current assets	12,896			4,755
Total current assets	486,679			834,334
Property, plant and equipment, net	31,982			21,306
Goodwill	0			0
Intangible assets, net	0			0
Operating lease right-of-use assets	3,987			4,665
Other assets	5,301,038			4,599,488
Total assets	5,823,686			5,459,793
Current liabilities:
Current portion of debt	3,822			5,096
Current portion of acquisition-related liabilities	0			0
Accounts payable	6,524			3,553
Accrued expenses	62,279			54,417
Current operating lease liabilities	910			921
Intercompany payables	1,942,556			1,750,352
Billings in excess of costs and estimated earnings	0			0
Total current liabilities	2,016,091			1,814,339
Long-term debt	1,488,069			1,488,569
Acquisition-related liabilities	0			0
Noncurrent operating lease liabilities	8,135			8,726
Other noncurrent liabilities	5,289			5,009
Total liabilities	3,517,584			3,316,643
Total member's interest	2,306,102			2,143,150
Total liabilities and members' interest	5,823,686			5,459,793
Summit Materials, LLC | Guarantors  | Reportable Legal Entities
Current assets:
Cash and cash equivalents	3,556			2,864
Accounts receivable, net	341,351			233,039
Intercompany receivables	2,152,362			1,937,390
Cost and estimated earnings in excess of billings	39,746			5,861
Inventories	236,913			206,418
Other current assets	9,848			16,341
Total current assets	2,783,776			2,401,913
Property, plant and equipment, net	1,865,176			1,710,972
Goodwill	1,185,739			1,076,935
Intangible assets, net	64,486			66,972
Operating lease right-of-use assets	30,048			28,310
Other assets	220,772			204,644
Total assets	6,149,997			5,489,746
Current liabilities:
Current portion of debt	0			0
Current portion of acquisition-related liabilities	7,028			13,718
Accounts payable	155,276			93,096
Accrued expenses	94,833			70,433
Current operating lease liabilities	7,276			5,637
Intercompany payables	509,873			513,494
Billings in excess of costs and estimated earnings	7,480			4,956
Total current liabilities	781,766			701,334
Long-term debt	0			0
Acquisition-related liabilities	27,633			29,051
Noncurrent operating lease liabilities	23,041			22,871
Other noncurrent liabilities	207,728			208,185
Total liabilities	1,040,168			961,441
Total member's interest	5,109,829			4,528,305
Total liabilities and members' interest	6,149,997			5,489,746
Summit Materials, LLC | Non-Guarantors | Reportable Legal Entities
Current assets:
Cash and cash equivalents	33,135			26,298
Accounts receivable, net	32,478			22,127
Intercompany receivables	0			0
Cost and estimated earnings in excess of billings	1,239			649
Inventories	6,223			6,073
Other current assets	1,334			1,159
Total current assets	74,409			56,306
Property, plant and equipment, net	77,374			81,424
Goodwill	56,733			56,611
Intangible assets, net	4,328			4,412
Operating lease right-of-use assets	4,345			4,914
Other assets	774			1,220
Total assets	217,963			204,887
Current liabilities:
Current portion of debt	0			0
Current portion of acquisition-related liabilities	0			0
Accounts payable	11,314			7,806
Accrued expenses	4,058			2,876
Current operating lease liabilities	559			738
Intercompany payables	2,114			3,288
Billings in excess of costs and estimated earnings	1,059			783
Total current liabilities	19,104			15,491
Long-term debt	0			0
Acquisition-related liabilities	0			0
Noncurrent operating lease liabilities	3,662			4,140
Other noncurrent liabilities	116,599			117,439
Total liabilities	139,365			137,070
Total member's interest	78,598			67,817
Total liabilities and members' interest	$ 217,963			$ 204,887

GUARANTOR AND NON-GUARANTOR F_4

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Schedule of Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Condensed Consolidating Statements of Operations
Total revenue	$ 794,797	$ 752,747	$ 1,959,335	$ 1,860,248
Cost of revenue (excluding items shown separately below)	543,159	534,936	1,389,599	1,372,521
Depreciation, depletion, amortization and accretion	57,452	52,133	163,133	150,483
Operating income	127,983	127,062	242,141	204,003
(Gain) loss on sale of business	0	(4,115)	0	(174,373)
Income from operations before taxes	256,633	112,480	326,164	319,650
Income tax expense	23,908	24,829	39,923	74,033
Net income attributable to Summit Inc.	230,045	86,489	282,878	242,310
Comprehensive income attributable to member of Summit Materials, LLC	227,015	78,826	283,090	231,757
Summit Materials, LLC
Condensed Consolidating Statements of Operations
Total revenue	794,797	752,747	1,959,335	1,860,248
Cost of revenue (excluding items shown separately below)	543,159	534,936	1,389,599	1,372,521
General and administrative expenses	66,203	38,616	164,462	133,241
Depreciation, depletion, amortization and accretion	57,452	52,133	163,133	150,483
Operating income	127,983	127,062	242,141	204,003
Other income, net	(3,581)	(3,283)	(14,276)	(4,956)
Interest expense (income)	28,013	21,980	83,335	62,728
(Gain) loss on sale of business	0	(4,115)	0	(174,373)
Income from operations before taxes	103,551	112,480	173,082	320,604
Income tax expense	8,451	7,147	15,103	19,557
Net income attributable to Summit Inc.	95,100	105,333	157,979	301,047
Comprehensive income attributable to member of Summit Materials, LLC	91,290	95,086	158,274	286,934
Summit Materials, LLC | Eliminations
Condensed Consolidating Statements of Operations
Total revenue	(1,486)	(2,875)	(3,844)	(8,366)
Cost of revenue (excluding items shown separately below)	(1,486)	(2,875)	(3,844)	(8,366)
General and administrative expenses	0	0	0	0
Depreciation, depletion, amortization and accretion	0	0	0	0
Operating income	0	0	0	0
Other income, net	168,314	144,575	340,125	316,514
Interest expense (income)	0	0	0	0
(Gain) loss on sale of business		0		0
Income from operations before taxes	(168,314)	(144,575)	(340,125)	(316,514)
Income tax expense	0	0	0	0
Net income attributable to Summit Inc.	(168,314)	(144,575)	(340,125)	(316,514)
Comprehensive income attributable to member of Summit Materials, LLC	(172,124)	(154,822)	(339,830)	(330,627)
Issuers | Summit Materials, LLC | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Total revenue	0	0	0	0
Cost of revenue (excluding items shown separately below)	0	0	0	0
General and administrative expenses	33,073	9,138	66,947	42,360
Depreciation, depletion, amortization and accretion	1,022	822	3,044	2,341
Operating income	(34,095)	(9,960)	(69,991)	(44,701)
Other income, net	(171,236)	(147,353)	(351,086)	(320,069)
Interest expense (income)	41,642	35,536	121,917	103,017
(Gain) loss on sale of business		(5,120)		(131,721)
Income from operations before taxes	95,499	106,977	159,178	304,072
Income tax expense	399	1,644	1,199	3,025
Net income attributable to Summit Inc.	95,100	105,333	157,979	301,047
Comprehensive income attributable to member of Summit Materials, LLC	91,290	95,086	158,274	286,934
Guarantors  | Summit Materials, LLC | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Total revenue	759,491	718,510	1,863,825	1,770,642
Cost of revenue (excluding items shown separately below)	519,059	511,848	1,324,138	1,310,495
General and administrative expenses	31,548	27,717	92,502	85,816
Depreciation, depletion, amortization and accretion	53,779	48,442	151,850	139,280
Operating income	155,105	130,503	295,335	235,051
Other income, net	(106)	(399)	(1,653)	(1,384)
Interest expense (income)	(15,002)	(14,926)	(42,695)	(44,399)
(Gain) loss on sale of business		1,005		(42,652)
Income from operations before taxes	170,213	144,823	339,683	323,486
Income tax expense	6,407	4,119	10,043	13,985
Net income attributable to Summit Inc.	163,806	140,704	329,640	309,501
Comprehensive income attributable to member of Summit Materials, LLC	163,806	140,704	329,640	309,501
Non-Guarantors | Summit Materials, LLC | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Total revenue	36,792	37,112	99,354	97,972
Cost of revenue (excluding items shown separately below)	25,586	25,963	69,305	70,392
General and administrative expenses	1,582	1,761	5,013	5,065
Depreciation, depletion, amortization and accretion	2,651	2,869	8,239	8,862
Operating income	6,973	6,519	16,797	13,653
Other income, net	(553)	(106)	(1,662)	(17)
Interest expense (income)	1,373	1,370	4,113	4,110
(Gain) loss on sale of business		0		0
Income from operations before taxes	6,153	5,255	14,346	9,560
Income tax expense	1,645	1,384	3,861	2,547
Net income attributable to Summit Inc.	4,508	3,871	10,485	7,013
Comprehensive income attributable to member of Summit Materials, LLC	$ 8,318	$ 14,118	$ 10,190	$ 21,126

GUARANTOR AND NON-GUARANTOR F_5

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Schedule of Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Dec. 31, 2022
Condensed Consolidating Statements of Operations
Net cash (used in) provided by operating activities	$ 243,624	$ 132,191
Cash flows from investing activities:
Acquisitions, net of cash acquired	(239,508)	(1,933)
Purchase of property, plant and equipment	(182,182)	(189,008)
Proceeds from the sale of property, plant, and equipment	9,760	8,298
Proceeds from sale of businesses	0	373,790
Other	(3,602)	(2,214)
Net cash (used in) provided by investing activities	(415,532)	188,933
Cash flows from financing activities:
Payments on long-term debt	(8,520)	(113,769)
Cash paid for tax receivable agreement interests	(122,935)	0
Payments on acquisition-related liabilities	(12,203)	(12,964)
Debt issuance costs	(1,566)
Distributions from partnership	(60)	(399)
Other	(6,011)	(774)
Net cash used in financing activities	(151,183)	(228,687)
Impact of foreign currency on cash	115	(1,732)
Net (decrease) increase in cash	(322,976)	90,705
Cash and cash equivalents – beginning of period	520,451	380,961	$ 380,961
Cash and cash equivalents – end of period	197,475	471,666	520,451
Summit Materials, LLC
Condensed Consolidating Statements of Operations
Net cash (used in) provided by operating activities	243,623	131,580
Cash flows from investing activities:
Acquisitions, net of cash acquired	(239,508)	(1,933)
Purchase of property, plant and equipment	(182,182)	(189,008)
Proceeds from the sale of property, plant, and equipment	9,760	8,298
Proceeds from sale of businesses	0	373,790
Other	(3,602)	(2,214)
Net cash (used in) provided by investing activities	(415,532)	188,933
Cash flows from financing activities:
Capital distributions to member	112	(100,781)
Loans received from and payments made on loans from other Summit Companies	0	0
Payments on long-term debt	(8,520)	(113,769)
Cash paid for tax receivable agreement interests	(122,935)	0
Payments on acquisition-related liabilities	(12,203)	(12,964)
Debt issuance costs	(1,566)
Distributions from partnership	(4,538)	(34,155)
Other	(6,011)	(774)
Net cash used in financing activities	(155,661)	(262,443)
Impact of foreign currency on cash	115	(1,732)
Net (decrease) increase in cash	(327,455)	56,338
Cash and cash equivalents – beginning of period	520,451	380,961	380,961
Cash and cash equivalents – end of period	192,996	437,299	520,451
Summit Materials, LLC | Eliminations
Condensed Consolidating Statements of Operations
Net cash (used in) provided by operating activities	0	0
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	0
Purchase of property, plant and equipment	0	0
Proceeds from the sale of property, plant, and equipment	0	0
Proceeds from sale of businesses		0
Other	0	0
Net cash (used in) provided by investing activities	0	0
Cash flows from financing activities:
Capital distributions to member	0	0
Loans received from and payments made on loans from other Summit Companies	(6,047)	(252)
Payments on long-term debt	0	0
Cash paid for tax receivable agreement interests	0
Payments on acquisition-related liabilities	0	0
Debt issuance costs	0
Distributions from partnership	0	0
Other	0	0
Net cash used in financing activities	(6,047)	(252)
Impact of foreign currency on cash	0	0
Net (decrease) increase in cash	(6,047)	(252)
Cash and cash equivalents – beginning of period	(7,018)	(4,684)	(4,684)
Cash and cash equivalents – end of period	(13,065)	(4,936)	(7,018)
Summit Materials, LLC | Issuers | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Net cash (used in) provided by operating activities	(124,375)	(109,265)
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	0
Purchase of property, plant and equipment	(9,490)	(7,927)
Proceeds from the sale of property, plant, and equipment	0	0
Proceeds from sale of businesses		5,924
Other	0	0
Net cash (used in) provided by investing activities	(9,490)	(2,003)
Cash flows from financing activities:
Capital distributions to member	(240,992)	(102,713)
Loans received from and payments made on loans from other Summit Companies	181,538	402,030
Payments on long-term debt	(3,822)	(100,400)
Cash paid for tax receivable agreement interests	(122,935)
Payments on acquisition-related liabilities	0	0
Debt issuance costs	(1,566)
Distributions from partnership	(4,538)	(34,155)
Other	(2,757)	(754)
Net cash used in financing activities	(195,072)	164,008
Impact of foreign currency on cash	0	0
Net (decrease) increase in cash	(328,937)	52,740
Cash and cash equivalents – beginning of period	498,307	365,044	365,044
Cash and cash equivalents – end of period	169,370	417,784	498,307
Summit Materials, LLC | Guarantors  | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Net cash (used in) provided by operating activities	352,592	225,563
Cash flows from investing activities:
Acquisitions, net of cash acquired	(239,508)	(1,933)
Purchase of property, plant and equipment	(168,843)	(177,028)
Proceeds from the sale of property, plant, and equipment	9,265	8,033
Proceeds from sale of businesses		367,866
Other	(3,602)	(2,214)
Net cash (used in) provided by investing activities	(402,688)	194,724
Cash flows from financing activities:
Capital distributions to member	241,104	1,932
Loans received from and payments made on loans from other Summit Companies	(170,376)	(396,330)
Payments on long-term debt	(4,698)	(13,369)
Cash paid for tax receivable agreement interests	0
Payments on acquisition-related liabilities	(12,203)	(12,964)
Debt issuance costs	0
Distributions from partnership	0	0
Other	(3,039)	(20)
Net cash used in financing activities	50,788	(420,751)
Impact of foreign currency on cash	0	0
Net (decrease) increase in cash	692	(464)
Cash and cash equivalents – beginning of period	2,864	2,264	2,264
Cash and cash equivalents – end of period	3,556	1,800	2,864
Summit Materials, LLC | Non-Guarantors | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Net cash (used in) provided by operating activities	15,406	15,282
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	0
Purchase of property, plant and equipment	(3,849)	(4,053)
Proceeds from the sale of property, plant, and equipment	495	265
Proceeds from sale of businesses		0
Other	0	0
Net cash (used in) provided by investing activities	(3,354)	(3,788)
Cash flows from financing activities:
Capital distributions to member	0	0
Loans received from and payments made on loans from other Summit Companies	(5,115)	(5,448)
Payments on long-term debt	0	0
Cash paid for tax receivable agreement interests	0
Payments on acquisition-related liabilities	0	0
Debt issuance costs	0
Distributions from partnership	0	0
Other	(215)	0
Net cash used in financing activities	(5,330)	(5,448)
Impact of foreign currency on cash	115	(1,732)
Net (decrease) increase in cash	6,837	4,314
Cash and cash equivalents – beginning of period	26,298	18,337	18,337
Cash and cash equivalents – end of period	$ 33,135	$ 22,651	$ 26,298