Summit Materials (SUM) 10-Q 2 May 24 2024 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Mar. 30, 2024	Apr. 29, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 30, 2024
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	2024
Document Fiscal Period Focus	Q1
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		175,464,775
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0
Summit Materials, LLC
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 30, 2024
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	2024
Document Fiscal Period Focus	Q1

Consolidated Balance Sheets - S

Consolidated Balance Sheets - Summit Materials Inc - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 30, 2023
Current assets:
Cash and cash equivalents	$ 498,110	$ 374,162
Restricted cash	0	800,000
Accounts receivable, net	454,650	287,252
Costs and estimated earnings in excess of billings	11,681	10,289
Inventories	338,501	241,350
Other current assets	40,644	17,937
Current assets held for sale	1,375	1,134
Total current assets	1,344,961	1,732,124
Property, plant and equipment, less accumulated depreciation, depletion and amortization (March 30, 2024 - $1,447,284 and December 30, 2023 - $1,267,557)	4,417,355	1,976,820
Goodwill	1,990,482	1,224,861
Intangible assets, less accumulated amortization (March 30, 2024 - $28,335 and December 30, 2023 - $18,972)	179,587	68,081
Deferred tax assets, less valuation allowance (March 30, 2024 - $1,113 and December 30, 2023 - $1,113)	0	52,009
Operating lease right-of-use assets	89,251	36,553
Other assets	108,264	59,134
Total assets	8,129,900	5,149,582
Current liabilities:
Current portion of debt	7,575	3,822
Current portion of acquisition-related liabilities	8,993	7,007
Accounts payable	290,914	123,621
Accrued expenses	191,776	171,691
Current operating lease liabilities	16,745	8,596
Billings in excess of costs and estimated earnings	6,005	8,228
Total current liabilities	522,008	322,965
Long-term debt	2,772,709	2,283,639
Acquisition-related liabilities	20,655	28,021
Tax receivable agreement liability	44,267	41,276
Deferred tax liabilities	205,669	15,854
Noncurrent operating lease liabilities	78,618	33,230
Other noncurrent liabilities	267,337	108,017
Total liabilities	3,911,263	2,833,002
Commitments and contingencies (see note 12)
Stockholders’ equity:
Preferred stock	0	0
Additional paid-in capital	3,403,307	1,421,813
Accumulated earnings	809,885	876,751
Accumulated other comprehensive income	3,690	7,275
Stockholders’ equity	4,218,637	2,307,035
Noncontrolling interest in Summit Holdings	0	9,545
Total stockholders’ equity	4,218,637	2,316,580
Total liabilities and members' interest	8,129,900	5,149,582
Common Class A
Stockholders’ equity:
Common stock	1,755	1,196
Common Class B
Stockholders’ equity:
Common stock	$ 0	$ 0

Consolidated Balance Sheets -_2

Consolidated Balance Sheets - Summit Materials Inc (Parenthetical) - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 30, 2023
Accumulated depreciation, depletion and amortization	$ 1,447,284	$ 1,267,557
Accumulated amortization	28,335	18,972
Valuation allowance	$ 1,113	$ 1,113
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	250,000,000	250,000,000
Preferred stock, shares outstanding (in shares)	1	0
Preferred stock, shares issued (in shares)	1	0
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)	175,454,250	119,529,380
Common stock, shares outstanding (in shares)	175,454,250	119,529,380
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)	0	99
Common stock, shares outstanding (in shares)	0	99

Consolidated Balance Sheets -_3

Consolidated Balance Sheets - Summit Materials LLC - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 30, 2023
Current assets:
Cash and cash equivalents	$ 498,110	$ 374,162
Restricted cash	0	800,000
Accounts receivable, net	454,650	287,252
Cost and estimated earnings in excess of billings	11,681	10,289
Inventories	338,501	241,350
Other current assets	40,644	17,937
Current assets held for sale	1,375	1,134
Total current assets	1,344,961	1,732,124
Property, plant and equipment, less accumulated depreciation, depletion and amortization (March 30, 2024 - $1,447,284 and December 30, 2023 - $1,267,557)	4,417,355	1,976,820
Goodwill	1,990,482	1,224,861
Intangible assets, less accumulated amortization (March 30, 2024 - $28,335 and December 30, 2023 - $18,972)	179,587	68,081
Operating lease right-of-use assets	89,251	36,553
Other assets	108,264	59,134
Total assets	8,129,900	5,149,582
Current liabilities:
Current portion of debt	7,575	3,822
Current portion of acquisition-related liabilities	8,993	7,007
Accounts payable	290,914	123,621
Accrued expenses	191,776	171,691
Current operating lease liabilities	16,745	8,596
Billings in excess of costs and estimated earnings	6,005	8,228
Total current liabilities	522,008	322,965
Long-term debt	2,772,709	2,283,639
Acquisition-related liabilities	20,655	28,021
Deferred tax liabilities	205,669	15,854
Noncurrent operating lease liabilities	78,618	33,230
Other noncurrent liabilities	267,337	108,017
Total liabilities	3,911,263	2,833,002
Commitments and contingencies (see note 11)
Stockholders’ equity:
Accumulated earnings	809,885	876,751
Accumulated other comprehensive loss	3,690	7,275
Total liabilities and members' interest	8,129,900	5,149,582
Summit Materials, LLC
Current assets:
Cash and cash equivalents	486,208	355,669
Restricted cash	0	800,000
Accounts receivable, net	454,799	287,252
Cost and estimated earnings in excess of billings	11,681	10,289
Inventories	338,501	241,350
Other current assets	40,644	17,937
Current assets held for sale	1,375	1,134
Current portion of tax receivable agreement interests	3,500	6,318
Total current assets	1,336,708	1,719,949
Property, plant and equipment, less accumulated depreciation, depletion and amortization (March 30, 2024 - $1,447,284 and December 30, 2023 - $1,267,557)	4,417,355	1,976,820
Goodwill	1,991,482	1,225,861
Intangible assets, less accumulated amortization (March 30, 2024 - $28,335 and December 30, 2023 - $18,972)	179,587	68,081
Operating lease right-of-use assets	89,251	36,553
Other assets	108,264	59,134
Tax receivable agreement interest, net of current portion	122,631	126,131
Total assets	8,245,278	5,212,529
Current liabilities:
Current portion of debt	7,575	3,822
Current portion of acquisition-related liabilities	8,993	7,007
Accounts payable	290,914	123,621
Accrued expenses	189,934	172,934
Current operating lease liabilities	16,745	8,596
Billings in excess of costs and estimated earnings	6,005	8,228
Total current liabilities	520,166	324,208
Long-term debt	2,772,709	2,283,639
Acquisition-related liabilities	20,655	28,021
Deferred tax liabilities	342,040	100,812
Noncurrent operating lease liabilities	78,618	33,230
Other noncurrent liabilities	267,337	87,614
Total liabilities	4,001,525	2,857,524
Commitments and contingencies (see note 11)
Stockholders’ equity:
Members' equity	3,393,412	1,421,610
Accumulated earnings	870,874	949,204
Accumulated other comprehensive loss	(20,533)	(15,809)
Total members' interest	4,243,753	2,355,005
Total liabilities and members' interest	$ 8,245,278	$ 5,212,529

Unaudited Consolidated Statemen

Unaudited Consolidated Statements of Operations - Summit Materials Inc - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Revenue:
Total revenue	$ 805,015	$ 435,388
Cost of revenue (excluding items shown separately below):
Total cost of revenue	624,011	354,037
General and administrative expenses	68,526	45,998
Depreciation, depletion, amortization and accretion	95,971	50,894
Transaction and integration costs	62,208	364
Gain on sale of property, plant and equipment	(848)	(430)
Operating loss	(44,853)	(15,475)
Interest expense	51,892	27,420
Loss on debt financings	5,453	493
Gain on sale of businesses	(14,985)	0
Other income, net	(8,878)	(5,710)
Loss from operations before taxes	(78,335)	(37,678)
Income tax benefit	(11,065)	(6,466)
Net loss	(67,270)	(31,212)
Net loss attributable to noncontrolling interest in Summit Holdings	(404)	(408)
Net loss attributable to Summit Inc.	$ (66,866)	$ (30,804)
Common Class A
Loss per share of Class A common stock:
Basic (in usd per share)	$ (0.40)	$ (0.26)
Diluted (in usd per share)	$ (0.40)	$ (0.26)
Weighted average shares of Class A common stock:
Basic (in shares)	167,446,041	118,564,556
Diluted (in shares)	167,511,575	118,679,656
Common Class A And Restricted Stock
Loss per share of Class A common stock:
Basic (in usd per share)	$ (0.40)	$ (0.26)
Weighted average shares of Class A common stock:
Basic (in shares)	167,511,575	118,679,656
Diluted (in shares)	167,511,575	118,679,656
Excluding delivery and subcontract revenue
Revenue:
Total revenue	$ 773,229	$ 407,270
Cost of revenue (excluding items shown separately below):
Total cost of revenue	592,225	325,919
Product
Revenue:
Total revenue	728,694	372,172
Cost of revenue (excluding items shown separately below):
Total cost of revenue	556,020	295,881
Service
Revenue:
Total revenue	44,535	35,098
Cost of revenue (excluding items shown separately below):
Total cost of revenue	36,205	30,038
Delivery and subcontract revenue
Revenue:
Total revenue	31,786	28,118
Cost of revenue (excluding items shown separately below):
Total cost of revenue	$ 31,786	$ 28,118

Unaudited Consolidated Statem_2

Unaudited Consolidated Statements of Operations - Summit Materials LLC - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Revenue:
Total revenue	$ 805,015	$ 435,388
Cost of revenue (excluding items shown separately below):
Total cost of revenue	624,011	354,037
General and administrative expenses	68,526	45,998
Depreciation, depletion, amortization and accretion	95,971	50,894
Transaction and integration costs	62,208	364
Gain on sale of property, plant and equipment	(848)	(430)
Operating loss	(44,853)	(15,475)
Interest expense	51,892	27,420
Loss on debt financings	5,453	493
Gain on sale of businesses	(14,985)	0
Other loss, net	(8,878)	(5,710)
Loss from operations before taxes	(78,335)	(37,678)
Income tax benefit	(11,065)	(6,466)
Net loss attributable to Summit Inc.	(66,866)	(30,804)
Summit Materials, LLC
Revenue:
Total revenue	805,015	435,388
Cost of revenue (excluding items shown separately below):
Total cost of revenue	624,011	354,037
General and administrative expenses	68,526	45,998
Depreciation, depletion, amortization and accretion	95,971	50,894
Transaction and integration costs	62,208	364
Gain on sale of property, plant and equipment	(848)	(430)
Operating loss	(44,853)	(15,475)
Interest expense	51,892	27,420
Loss on debt financings	5,453	493
Gain on sale of businesses	(14,985)	0
Other loss, net	(8,687)	(5,710)
Loss from operations before taxes	(78,526)	(37,678)
Income tax benefit	(196)	(467)
Net loss attributable to Summit Inc.	(78,330)	(37,211)
Excluding delivery and subcontract revenue
Revenue:
Total revenue	773,229	407,270
Cost of revenue (excluding items shown separately below):
Total cost of revenue	592,225	325,919
Excluding delivery and subcontract revenue | Summit Materials, LLC
Revenue:
Total revenue	773,229	407,270
Cost of revenue (excluding items shown separately below):
Total cost of revenue	592,225	325,919
Product
Revenue:
Total revenue	728,694	372,172
Cost of revenue (excluding items shown separately below):
Total cost of revenue	556,020	295,881
Product | Summit Materials, LLC
Revenue:
Total revenue	728,694	372,172
Cost of revenue (excluding items shown separately below):
Total cost of revenue	556,020	295,881
Service
Revenue:
Total revenue	44,535	35,098
Cost of revenue (excluding items shown separately below):
Total cost of revenue	36,205	30,038
Service | Summit Materials, LLC
Revenue:
Total revenue	44,535	35,098
Cost of revenue (excluding items shown separately below):
Total cost of revenue	36,205	30,038
Delivery and subcontract revenue
Revenue:
Total revenue	31,786	28,118
Cost of revenue (excluding items shown separately below):
Total cost of revenue	31,786	28,118
Delivery and subcontract revenue | Summit Materials, LLC
Revenue:
Total revenue	31,786	28,118
Cost of revenue (excluding items shown separately below):
Total cost of revenue	$ 31,786	$ 28,118

Unaudited Consolidated Statem_3

Unaudited Consolidated Statements of Comprehensive Income - Summit Materials Inc - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Comprehensive income (loss)
Net loss	$ (67,270)	$ (31,212)
Other comprehensive income (loss):
Foreign currency translation adjustment	(4,724)	203
Less tax effect of other comprehensive income (loss) items	1,139	(39)
Other comprehensive (loss) income	(3,585)	164
Comprehensive loss	(70,855)	(31,048)
Less comprehensive loss attributable to Summit Holdings	(404)	(405)
Comprehensive loss attributable to Summit Inc.	$ (70,451)	$ (30,643)

Unaudited Consolidated Statem_4

Unaudited Consolidated Statements of Comprehensive Income - Summit Materials LLC - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Net loss	$ (67,270)	$ (31,212)
Other comprehensive income (loss):
Foreign currency translation adjustment	(4,724)	203
Comprehensive loss attributable to Summit Inc.	(70,451)	(30,643)
Summit Materials, LLC
Net loss	(78,330)	(37,211)
Other comprehensive income (loss):
Foreign currency translation adjustment	(4,724)	203
Comprehensive loss attributable to Summit Inc.	$ (83,054)	$ (37,008)

Unaudited Consolidated Statem_5

Unaudited Consolidated Statements of Cash Flows - Summit Materials Inc - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Cash flows from operating activities:
Net loss	$ (67,270)	$ (31,212)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	106,354	53,927
Share-based compensation expense	6,720	4,708
Net gain on asset and business disposals	(15,834)	(868)
Non-cash loss on debt financings	5,453	161
Change in deferred tax asset, net	(19,054)	(7,522)
Other	748	26
Decrease (increase) in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	(11,127)	20,414
Inventories	(5,302)	(20,960)
Costs and estimated earnings in excess of billings	(1,799)	(7,868)
Other current assets	(1,973)	(3,748)
Other assets	4,839	2,239
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	21,177	20,987
Accrued expenses	(60,842)	(27,968)
Billings in excess of costs and estimated earnings	(1,780)	(1,507)
Tax receivable agreement (benefit) expense	6,227	(531)
Other liabilities	(6,782)	57
Net cash (used in) provided by operating activities	(40,245)	335
Cash flows from investing activities:
Acquisitions, net of cash acquired	(1,100,919)	(55,477)
Purchase of intellectual property	(21,400)	0
Purchases of property, plant and equipment	(58,519)	(63,584)
Proceeds from the sale of property, plant and equipment	2,664	1,777
Proceeds from sale of businesses	75,993	0
Other	(1,240)	(1,045)
Net cash used in investing activities	(1,103,421)	(118,329)
Cash flows from financing activities:
Proceeds from debt issuances	1,007,475	0
Debt issuance costs	(17,550)	(1,566)
Payments on debt	(506,392)	(4,414)
Payments on acquisition-related liabilities	(6,124)	(11,374)
Proceeds from stock option exercises	593	15
Other	(9,260)	(5,719)
Net cash provided by (used in) financing activities	468,742	(23,058)
Impact of foreign currency on cash	(1,128)	58
Net decrease in cash and cash equivalents and restricted cash	(676,052)	(140,994)
Cash and cash equivalents and restricted cash—beginning of period	1,174,162	520,451
Cash and cash equivalents and restricted cash—end of period	$ 498,110	$ 379,457

Unaudited Consolidated Statem_6

Unaudited Consolidated Statements of Cash Flows - Summit Materials LLC - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Cash flows from operating activities:
Net loss	$ (67,270)	$ (31,212)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	106,354	53,927
Share-based compensation expense	6,720	4,708
Net gain on asset and business disposals	(15,834)	(868)
Non-cash loss on debt financings	5,453	161
Change in deferred tax asset, net	(19,054)	(7,522)
Other	748	26
Decrease (increase) in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	(11,127)	20,414
Inventories	(5,302)	(20,960)
Costs and estimated earnings in excess of billings	(1,799)	(7,868)
Other current assets	(1,973)	(3,748)
Other assets	4,839	2,239
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	21,177	20,987
Accrued expenses	(60,842)	(27,968)
Billings in excess of costs and estimated earnings	(1,780)	(1,507)
Other liabilities	(6,782)	57
Net cash (used in) provided by operating activities	(40,245)	335
Cash flows from investing activities:
Acquisitions, net of cash acquired	(1,100,919)	(55,477)
Purchase of intellectual property	(21,400)	0
Purchases of property, plant and equipment	(58,519)	(63,584)
Proceeds from the sale of property, plant and equipment	2,664	1,777
Proceeds from sale of businesses	75,993	0
Other	(1,240)	(1,045)
Net cash used in investing activities	(1,103,421)	(118,329)
Cash flows from financing activities:
Debt issuance costs	(17,550)	(1,566)
Payments on debt	(506,392)	(4,414)
Payments on acquisition-related liabilities	(6,124)	(11,374)
Other	(9,260)	(5,719)
Net cash provided by (used in) financing activities	468,742	(23,058)
Impact of foreign currency on cash	(1,128)	58
Net decrease in cash and cash equivalents and restricted cash	(676,052)	(140,994)
Cash and cash equivalents and restricted cash—beginning of period	1,174,162	520,451
Cash and cash equivalents and restricted cash—end of period	498,110	379,457
Summit Materials, LLC
Cash flows from operating activities:
Net loss	(78,330)	(37,211)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	106,354	53,927
Share-based compensation expense	6,720	4,708
Net gain on asset and business disposals	(15,834)	(868)
Non-cash loss on debt financings	5,453	161
Change in deferred tax asset, net	(1,494)	(1,510)
Other	748	26
Decrease (increase) in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	(11,127)	20,414
Inventories	(5,302)	(20,960)
Costs and estimated earnings in excess of billings	(1,799)	(7,868)
Other current assets	845	(3,748)
Other assets	8,339	2,239
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	21,177	20,443
Accrued expenses	(60,693)	(27,968)
Billings in excess of costs and estimated earnings	(1,780)	(1,507)
Other liabilities	(6,782)	57
Net cash (used in) provided by operating activities	(33,505)	335
Cash flows from investing activities:
Acquisitions, net of cash acquired	(1,100,919)	(55,477)
Purchase of intellectual property	(21,400)
Purchases of property, plant and equipment	(58,519)	(63,584)
Proceeds from the sale of property, plant and equipment	2,664	1,777
Proceeds from sale of businesses	75,993	0
Other	(1,240)	(1,045)
Net cash used in investing activities	(1,103,421)	(118,329)
Cash flows from financing activities:
Capital (distributions to) contributions by member	593	15
Debt issuance costs	(17,550)	(1,566)
Payments on debt	(506,392)	(4,414)
Payments on acquisition-related liabilities	(6,124)	(11,374)
Other	(9,409)	(5,719)
Net cash provided by (used in) financing activities	468,593	(23,058)
Impact of foreign currency on cash	(1,128)	58
Net decrease in cash and cash equivalents and restricted cash	(669,461)	(140,994)
Cash and cash equivalents and restricted cash—beginning of period	1,155,669	520,451
Cash and cash equivalents and restricted cash—end of period	$ 486,208	$ 379,457

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 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				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				2,000
LP Unit exchanges	0							21	(21)
Other comprehensive income (loss), net of tax	164				161				3
Stock option exercises (in shares)		902				902
Stock option exercises	15							15
Share-based compensation	4,708							4,708
Shares redeemed to settle taxes and other (in shares)		407,114				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				118,818,671	99
Beginning balance at Dec. 30, 2023	2,316,580			876,751	7,275	$ 1,196	$ 0	1,421,813	9,545
Beginning balance (in shares) at Dec. 30, 2023		119,529,380	99			119,529,380	99
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(67,270)			(66,866)					(404)
LP Unit exchanges (in shares)		763,243				763,243
LP Unit exchanges	0					$ 8		9,534	(9,542)
Other comprehensive income (loss), net of tax	(3,585)				(3,585)				0
Stock option exercises (in shares)		29,216				29,216
Stock option exercises	$ 593							593
Class B share cancellation (in shares)	(99)
Share-based compensation	$ 6,720							6,720
Issuance of Class A common stock (in shares)		54,720,000
Issuance of Class A common stock	1,973,750	$ 547						1,973,203
Shares redeemed to settle taxes and other (in shares)		412,411				412,411
Shares redeemed to settle taxes and other	(8,151)					$ 4		(8,556)	401
Ending balance at Mar. 30, 2024	$ 4,218,637			$ 809,885	$ 3,690	$ 1,755	$ 0	$ 3,403,307	$ 0
Ending balance (in shares) at Mar. 30, 2024		175,454,250	0			175,454,250	0

Unaudited Consolidated Statem_8

Unaudited Consolidated Statements of Changes in Members' Interest - Summit Materials LLC - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (67,270)	$ (31,212)
Other comprehensive (loss) income	(3,585)	164
Share-based compensation	6,720	4,708
Shares redeemed to settle taxes and other	(8,151)	(5,719)
Summit Materials, LLC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,355,005	2,143,150
Net contributed capital	1,974,491	15
Net loss	(78,330)	(37,211)
Other comprehensive (loss) income	(4,724)	203
Share-based compensation	6,720	4,708
Shares redeemed to settle taxes and other	(9,409)	(5,719)
Ending balance	4,243,753	2,105,146
Members' equity | Summit Materials, LLC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,421,610	1,425,278
Net contributed capital	1,974,491	15
Share-based compensation	6,720	4,708
Shares redeemed to settle taxes and other	(9,409)	(5,719)
Ending balance	3,393,412	1,424,282
Accumulated earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(66,866)	(30,804)
Accumulated earnings | Summit Materials, LLC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	949,204	739,248
Net loss	(78,330)	(37,211)
Ending balance	870,874	702,037
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive (loss) income	(3,585)	161
Accumulated other comprehensive loss | Summit Materials, LLC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(15,809)	(21,376)
Other comprehensive (loss) income	(4,724)	203
Ending balance	$ (20,533)	$ (21,173)

Consolidated Balance Sheets -_4

Consolidated Balance Sheets - Summit Materials LLC (Parenthetical) - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 30, 2023
Accumulated depreciation, depletion and amortization	$ 1,447,284	$ 1,267,557
Accumulated amortization	28,335	18,972
Summit Materials, LLC
Accumulated depreciation, depletion and amortization	1,447,284	1,267,557
Accumulated amortization	$ 28,335	$ 18,972

SUMMARY OF ORGANIZATION AND SIG

SUMMARY OF ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 30, 2024
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, six 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. On September 23, 2014, Summit Inc. was formed as a Delaware corporation to be a holding company. As of March 30, 2024, Summit Inc. held 100% of the economic interests and voting power of Summit Materials Holdings L.P. (“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 ("IPO"), Summit Inc. became a holding corporation operating and controlling all of the business and affairs of Summit Holdings and its subsidiaries. Summit Inc. directly and indirectly owns all of the partnership interests of Summit Holdings (see note 11, 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. On January 12, 2024, Summit completed a combination with Argos North America Corp. ("Argos USA"), Cementos Argos S.A. ("Cementos Argos"), Argos SEM LLC and Valle Cement Investments, Inc. (the "Argos Parties," and together with Argos USA, "Argos"), pursuant to which Summit acquired all of the outstanding equity interests (the "Transaction") of Argos USA from the Argos SEM LLC and Valle Cement Investments, Inc. in exchange for $1.2 billion of cash, the issuance of 54,720,000 shares of the Summit Inc.'s Class A common stock and one preferred share in a transaction valued at approximately $3.1 billion. The cash consideration was funded from the net proceeds of an $800 million offering of Senior Notes due 2031 and new term loan borrowings under our current credit facility. The purchase price is subject to customary adjustments, with any upward or downward adjustments made against the cash consideration. The Transaction Agreement, dated as of September 7, 2023, contains customary representations and warranties, covenants and agreements, including a Stockholder Agreement. For additional details related to the Transaction, see Note 2, Acquisitions, Dispositions, Goodwill and Intangibles. 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 30, 2023. 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 March 30, 2024, the results of operations for the three months ended March 30, 2024 and April 1, 2023 and cash flows for the three months ended March 30, 2024 and April 1, 2023. 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 24 U.S. states and in British Columbia, Canada, with the most significant revenue generated in Texas, Florida, Georgia, Utah, Missouri, and Kansas. 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 months ended March 30, 2024 or April 1, 2023. 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. 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 $0.4 million for the three months ended April 1, 2023, from general and administrative expenses to a separate line item included in operating income to conform to the current year presentation. We have also reclassified our deferred tax liabilities of $15.9 million as of December 30, 2023, from other non-current liabilities to a separate line item in long term liabilities.
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, six 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. On January 12, 2024, Summit Inc. completed a combination with Argos North America Corp. ("Argos USA"), Cementos Argos S.A. ("Cementos Argos"), Argos SEM LLC and Valle Cement Investments, Inc. (the "Argos Parties," and together with Argos USA, "Argos"), pursuant to which Summit Inc. acquired all of the outstanding equity interests (the "Transaction") of Argos USA from the Argos SEM LLC and Valle Cement Investments, Inc. in exchange for $1.2 billion of cash, the issuance of 54,720,000 shares of the Summit Inc.'s Class A common stock and one preferred share in a transaction valued at approximately $3.1 billion. The cash consideration was funded from the net proceeds of an $800 million offering of Senior Notes due 2031 and new term loan borrowings under our current credit facility. The purchase price is subject to customary adjustments, with any upward or downward adjustments made against the cash consideration. The Transaction Agreement, dated as of September 7, 2023, contains customary representations and warranties, covenants and agreements. For additional details related to the Transaction, see Note 2, Acquisitions, Dispositions, Goodwill and Intangibles. 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 30, 2023. 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 March 30, 2024, the results of operations for the three months ended March 30, 2024 and April 1, 2023 and cash flows for the three months ended March 30, 2024 and April 1, 2023. 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 24 U.S. states and in British Columbia, Canada, with the most significant revenue generated in Texas, Florida, Georgia, Utah, Missouri and Kansas. 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 months ended March 30, 2024 or April 1, 2023. 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 $0.4 million for the three months ended April 1, 2023, 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	3 Months Ended
	Mar. 30, 2024
Business Acquisition [Line Items]
ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES	ACQUISITIONS, DISPOSITIONS, GOODWILL AND INTANGIBLES Acquisition of Argos USA On January 12, 2024, Summit completed its acquisition of all of the outstanding equity interests of Argos USA from Argos SEM LLC and Valle Cement Investments, Inc. for total consideration of approximately $3.1 billion. Summit acquired all of the outstanding equity interests of Argos USA in exchange for (i) $1.2 billion of cash (subject to customary adjustments), (ii) 54,720,000 shares of Class A Common Stock and (iii) one share of preferred stock, par value $0.01 per share, of Summit Inc. (together with the Class A Consideration, the “Stock Consideration”). The Argos USA assets include four integrated cement plants, two grinding facilities, 140 ready-mix concrete plants, eight ports and 10 inland terminals across the East and Gulf Coast regions, with a total installed cement grinding capacity of 9.6 million tons per annum and a total import capacity of 5.4 million tons of cement per annum. The results of Argos USA’s operations are included in these consolidated financial statements from the closing date of the Transaction. Argos USA revenues and net income included in the consolidated income statement for the period from January 12, 2024 to March 30, 2024 was $352.4 million and $18.9 million, respectively. The following table includes unaudited pro forma financial information that presents the consolidated results of operations for the three months ended March 30, 2024 and April 1, 2023 as if the Transaction had occurred on January 1, 2023. Q1 2024 Q1 2023 Total Revenues $ 848,902 $ 835,396 Net income attributable to Summit Inc. $ (66,269) $ (35,844) The unaudited pro forma information has been calculated after adjusting the results of Argos USA for the following impacts of the Transaction, among other items: • Additional depreciation, depletion, and amortization for property, plant, and equipment and intangible assets acquired. • Interest expense adjustments to reflect the payoff of Argos USA debt obligations and new debt issued by the Company to complete the Transaction. • Elimination of royalties expenses paid to the parent of Argos USA which will not be incurred post-combination. • Elimination of historical transaction expenses of Argos USA incurred to pursue an initial public offering. The Company incurred combination-related costs of $61.3 million in the three months ended March 30, 2024 and none for the three months ended April 1, 2023. These expenses are included in transaction and integration costs on consolidated income statement and are reflected in pro forma net income attributable to Summit Inc. for the three months ended April 1, 2023 in the table above. The pro forma results do not include any cost savings or associated costs to achieve such savings from operating efficiencies or synergies that may result from the combination. The unaudited pro forma financial information is provided for informational purposes only and is not necessarily indicative of the consolidated results of operations of the Company had the combination actually occurred on January 1, 2023, nor of the results of our future operations of the combined business. The pro forma results are based on the preliminary purchase price allocation and will be updated to reflect the final amounts as the allocation is finalized during the measurement period. Fair value of consideration transferred Cash consideration $ 1,145,463 Fair value of stock consideration issued 1,973,750 Total fair value of consideration transferred $ 3,119,213 Summit Inc. issued 54,720,000 shares of common stock and calculated the fair value of stock consideration using a per share price of $36.07 on January 12, 2024, the closing date of the Transaction. The fair value of preferred stock is immaterial. The preferred stock is non-transferable and has no economic rights or ordinary voting rights. The preferred stock was issued to ensure the Argos Parties’ voting interests are not involuntarily diluted and provides a short window to purchase shares of Class A Common Stock in the market, in certain limited circumstances, to prevent the Argos Parties voting interests from dropping below 25.01% of the total Summit common stock. Argos USA Preliminary Purchase Price Allocation The acquisition of all of the outstanding equity interests of Argos USA was accounted for in accordance with Accounting Standards Codification 805, Business Combinations. The identifiable assets acquired and liabilities assumed were recorded at their estimated preliminary acquisition date fair values. The excess purchase price over the fair values of identifiable assets and liabilities is recorded as goodwill. The following table summarizes the preliminary allocation of the purchase price to the fair value of assets acquired and liabilities assumed. Purchase Price $ 3,119,213 Asset acquired: Cash and cash equivalents 97,153 Accounts receivable, net 156,195 Inventories 95,448 Other current assets 18,178 Intangible assets, net 100,000 Property, plant and equipment, net 2,447,340 Operating lease right of use assets 55,756 Other assets 52,684 Liabilities assumed: Accounts payable (113,929) Accrued expenses (73,039) Current operating lease liabilities (7,545) Noncurrent operating lease liabilities (48,211) Deferred tax liabilities (263,530) Other noncurrent liabilities (166,233) Fair value of identifiable net assets acquired 2,350,267 Goodwill $ 768,946 The purchase price has been preliminarily allocated to the assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date. The fair value estimates of assets acquired and liabilities assumed are pending the completion of various items, including obtaining further information regarding the identification and valuation of all assets acquired and liabilities assumed. Certain of the more significant balances that are not yet finalized include the valuation of property, plant and equipment, intangible assets (including goodwill), inventories, and other working capital accounts, and related income tax considerations. Accordingly, management considers the balances above to be preliminary, and there could be adjustments to the consolidated financial statements in subsequent periods, including changes to depreciation and amortization expense related to the property, plant, and equipment and intangible assets acquired and their respective useful lives, among other adjustments. The final determination of the fair values of the assets acquired and liabilities assumed will be completed within the measurement period of up to one year from the acquisition date. The identified intangible assets acquired include Customer Relationships and Contractual Intangible Assets, with preliminary fair values of $85.0 million and $15.0 million, respectively, and expected to be amortized over a weighted average amortization period of 3 and 8 years, respectively. Goodwill Goodwill recognized includes synergies expected to be achieved from the operations of the combined company, the assembled workforce of Argos USA, and intangible assets that do not qualify for separate recognition. Expected synergies include both increased revenue opportunities and the cost savings from the planned integration of platform infrastructure, facilities, personnel, and systems. The transaction is considered a non-taxable business combination and the goodwill is not deductible for tax purposes. The allocation of goodwill to the Company’s reporting units is not complete and is subject to change during the measurement period. On a preliminary basis, all goodwill was assigned to the Cement reportable segment. Intellectual Property License Agreement In connection with the Transaction, the Company and Argos USA entered into an Intellectual Property License Agreement with the Argos Parties pursuant to which the parties will grant each other various intellectual property licenses. Certain intellectual property licenses from the Argos Parties, including the "Argos" trade name in Canada and the United States, are provided on a royalty-fee basis. The $21.4 million fair value of these acquired intangible assets was excluded from consideration transferred and recorded separately from the business combination. Other Acquisitions 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 other acquisitions by region and period: Three months ended Year ended March 30, 2024 December 30, 2023 West* 1 3 East* — 1 Cement* — — _______________________________________________________________________ * The combination with Argos USA affected all three reporting segments. In addition to the acquisition of all of the outstanding equity interests of Argos USA, we also acquired one aggregates-based operation in our West segment. The purchase price allocation, primarily the valuation of property, plant and equipment, as well as considerations for contracts assumed in the acquisition, for the acquisitions completed during the three months ended March 30, 2024, as well as the acquisitions completed during 2023 that occurred after April 1, 2023, 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: Three months ended Year ended March 30, 2024 December 30, 2023 Financial assets $ 1,740 $ 12,747 Inventories 161 6,251 Property, plant and equipment 15,170 125,207 Other assets 333 1,085 Financial liabilities (903) (11,973) Other long-term liabilities (407) (802) Net assets acquired 16,094 132,515 Goodwill 36,515 108,590 Purchase price 52,609 241,105 Other — (1,597) Net cash paid for acquisitions $ 52,609 $ 239,508 Changes in the carrying amount of goodwill, by reportable segment, from December 30, 2023 to March 30, 2024 are summarized as follows: West East Cement Total Balance—December 30, 2023 $ 658,704 $ 361,501 $ 204,656 $ 1,224,861 Acquisitions (1) 36,101 — 768,946 805,047 Dispositions (2) — (37,938) — (37,938) Foreign currency translation adjustments (1,488) — — (1,488) Balance—March 30, 2024 $ 693,317 $ 323,563 $ 973,602 $ 1,990,482 _______________________________________________________________________ (1) Reflects goodwill from 2024 acquisitions and working capital adjustments from prior year acquisitions. (2) Reflects goodwill derecognition from dispositions completed during 2024. 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: March 30, 2024 December 30, 2023 Gross Accumulated Net Gross Accumulated Net Operating permits $ 38,677 $ (6,089) $ 32,588 $ 38,677 $ (5,691) $ 32,986 Mineral leases 17,375 (7,498) 9,877 17,778 (7,676) 10,102 Reserve rights 25,586 (5,226) 20,360 25,586 (5,020) 20,566 Intellectual property 21,400 (2,339) 19,061 — — — Other 104,884 (7,183) 97,701 5,012 (585) 4,427 Total intangible assets $ 207,922 $ (28,335) $ 179,587 $ 87,053 $ (18,972) $ 68,081 Amortization expense totaled $9.2 million and $0.9 million for the three months ended March 30, 2024 and April 1, 2023, respectively. The estimated amortization expense for the intangible assets for each of the five years subsequent to March 30, 2024 is as follows: 2024 (nine months) $ 33,705 2025 44,713 2026 34,345 2027 6,629 2028 5,707 2029 4,999 Thereafter 49,489 Total $ 179,587
Summit Materials, LLC
Business Acquisition [Line Items]
ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES	ACQUISITIONS, DISPOSITIONS, GOODWILL AND INTANGIBLES Acquisition of Argos USA On January 12, 2024, Summit Inc. completed its acquisition of all of the outstanding equity interests of Argos USA from Argos SEM LLC and Valle Cement Investments, Inc. for total consideration of approximately $3.1 billion. Summit Inc. acquired all of the outstanding equity interests of Argos USA in exchange for (i) $1.2 billion of cash (subject to customary adjustments), (ii) 54,720,000 shares of Class A Common Stock and (iii) one share of preferred stock, par value $0.01 per share, of Summit Inc. (together with the Class A Consideration, the “Stock Consideration”). The Argos USA assets include four integrated cement plants, two grinding facilities, 140 ready-mix concrete plants, eight ports and 10 inland terminals across the East and Gulf Coast regions, with a total installed cement grinding capacity of 9.6 million tons per annum and a total import capacity of 5.4 million tons of cement per annum. The results of Argos USA’s operations are included in these consolidated financial statements from the closing date of the Transaction. Argos USA revenues and net income included in the consolidated income statement for the period from January 12, 2024 to March 30, 2024 was $352.4 million and $18.9 million, respectively. The following table includes unaudited pro forma financial information that presents the consolidated results of operations for the three months ended March 30, 2024 and April 1, 2023 as if the Transaction had occurred on January 1, 2023. Q1 2024 Q1 2023 Total Revenues $ 848,902 $ 835,396 Net income attributable to Summit Inc. $ (66,269) $ (35,844) The unaudited pro forma information has been calculated after adjusting the results of Argos USA for the following impacts of the Transaction, among other items: • Additional depreciation, depletion, and amortization for property, plant, and equipment and intangible assets acquired • Interest expense adjustments to reflect the payoff of Argos USA debt obligations and new debt issued by the Company to complete the Transaction • Elimination of royalties expenses paid to the parent of Argos USA which will not be incurred post-combination • Elimination of historical transaction expenses of Argos USA incurred to pursue an initial public offering The Company incurred combination-related costs of $61.3 million in the three months ended March 30, 2024 and none for the three months ended April 1, 2023. These expenses are included in transaction and integration costs on consolidated income statement and are reflected in pro forma net income attributable to Summit Inc. for the three months ended April 1, 2023 in the table above. The pro forma results do not include any cost savings or associated costs to achieve such savings from operating efficiencies or synergies that may result from the combination. The unaudited pro forma financial information is provided for informational purposes only and is not necessarily indicative of the consolidated results of operations of the Company had the combination actually occurred on January 1, 2023, nor of the results of our future operations of the combined business. The pro forma results are based on the preliminary purchase price allocation and will be updated to reflect the final amounts as the allocation is finalized during the measurement period. Fair value of consideration transferred Cash consideration $ 1,145,463 Fair value of stock consideration issued 1,973,750 Total fair value of consideration transferred $ 3,119,213 Summit Inc. issued 54,720,000 shares of common stock and calculated the fair value of stock consideration using a per share price of $36.07 on January 12, 2024, the closing date of the Transaction. The fair value of preferred stock is immaterial. The preferred stock is non-transferable and has no economic rights or ordinary voting rights. The preferred stock was issued to ensure the Argos Parties’ voting interests are not involuntarily diluted and provides a short window to purchase shares of Class A Common Stock in the market, in certain limited circumstances, to prevent the Argos Parties voting interests from dropping below 25.01% of the total Summit common stock. Argos USA Preliminary Purchase Price Allocation The acquisition of all of the outstanding equity interests of Argos USA was accounted for in accordance with Accounting Standards Codification 805, Business Combinations. The identifiable assets acquired and liabilities assumed were recorded at their estimated preliminary acquisition date fair values. The excess purchase price over the fair values of identifiable assets and liabilities is recorded as goodwill. The following table summarizes the preliminary allocation of the purchase price to the fair value of assets acquired and liabilities assumed. Purchase Price $ 3,119,213 Asset acquired: Cash and cash equivalents 97,153 Accounts receivable, net 156,195 Inventories 95,448 Other current assets 18,178 Intangible assets, net 100,000 Property, plant and equipment, net 2,447,340 Operating lease right of use assets 55,756 Other assets 52,684 Liabilities assumed: Accounts payable (113,929) Accrued expenses (73,039) Current operating lease liabilities (7,545) Noncurrent operating lease liabilities (48,211) Deferred tax liabilities (263,530) Other noncurrent liabilities (166,233) Fair value of identifiable net assets acquired 2,350,267 Goodwill $ 768,946 The purchase price has been preliminarily allocated to the assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date. The fair value estimates of assets acquired and liabilities assumed are pending the completion of various items, including obtaining further information regarding the identification and valuation of all assets acquired and liabilities assumed. Certain of the more significant balances that are not yet finalized include the valuation of property, plant and equipment, intangible assets (including goodwill), inventories, and other working capital accounts, and related income tax considerations. Accordingly, management considers the balances above to be preliminary, and there could be adjustments to the consolidated financial statements in subsequent periods, including changes to depreciation and amortization expense related to the property, plant, and equipment and intangible assets acquired and their respective useful lives, among other adjustments. The final determination of the fair values of the assets acquired and liabilities assumed will be completed within the measurement period of up to one year from the acquisition date. The identified intangible assets acquired include Customer Relationships and Contractual Intangible Assets, with preliminary fair values of $85.0 million and $15.0 million, respectively, and expected to be amortized over a weighted average amortization period of 3 and 8 years, respectively. Goodwill Goodwill recognized includes synergies expected to be achieved from the operations of the combined company, the assembled workforce of Argos USA, and intangible assets that do not qualify for separate recognition. Expected synergies include both increased revenue opportunities and the cost savings from the planned integration of platform infrastructure, facilities, personnel, and systems. The transaction is considered a non-taxable business combination and the goodwill is not deductible for tax purposes. The allocation of goodwill to the Company’s reporting units is not complete and is subject to change during the measurement period. On a preliminary basis, all goodwill was assigned to the Cement reportable segment. Intellectual Property License Agreement In connection with the Transaction, Summit Inc. and Argos USA entered into an Intellectual Property License Agreement with the Argos Parties pursuant to which the parties will grant each other various intellectual property licenses. Certain intellectual property licenses from the Argos Parties, including the "Argos" trade name in Canada and the United States, are provided on a royalty-fee basis. The $21.4 million fair value of these acquired intangible assets was excluded from consideration transferred and recorded separately from the business combination. Other Acquisitions 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 other acquisitions by region and period: Three months ended Year ended March 30, 2024 December 30, 2023 West* 1 3 East* — 1 Cement* — — _______________________________________________________________________ * The combination with Argos USA affected all three reporting segments. In addition to the acquisition of all of the outstanding equity interests of Argos USA, we also acquired one aggregates-based operation in our West segment. The purchase price allocation, primarily the valuation of property, plant and equipment, as well as considerations for contracts assumed in the acquisition, for the acquisitions completed during the three months ended March 30, 2024, as well as the acquisitions completed during 2023 that occurred after April 1, 2023, 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: Three months ended Year ended March 30, 2024 December 30, 2023 Financial assets $ 1,740 $ 12,747 Inventories 161 6,251 Property, plant and equipment 15,170 125,207 Other assets 333 1,085 Financial liabilities (903) (11,973) Other long-term liabilities (407) (802) Net assets acquired 16,094 132,515 Goodwill 36,515 108,590 Purchase price 52,609 241,105 Other — (1,597) Net cash paid for acquisitions $ 52,609 $ 239,508 Changes in the carrying amount of goodwill, by reportable segment, from December 30, 2023 to March 30, 2024 are summarized as follows: West East Cement Total Balance—December 30, 2023 $ 659,704 $ 361,501 $ 204,656 $ 1,225,861 Acquisitions (1) 36,101 — 768,946 805,047 Dispositions (2) — (37,938) — (37,938) Foreign currency translation adjustments (1,488) — — (1,488) Balance—March 30, 2024 $ 694,317 $ 323,563 $ 973,602 $ 1,991,482 _______________________________________________________________________ (1) Reflects goodwill from 2024 acquisitions and working capital adjustments from prior year acquisitions. (2) Reflects goodwill derecognition from dispositions completed during 2024. 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: March 30, 2024 December 30, 2023 Gross Accumulated Net Gross Accumulated Net Operating permits $ 38,677 $ (6,089) $ 32,588 $ 38,677 $ (5,691) $ 32,986 Mineral leases 17,375 (7,498) 9,877 17,778 (7,676) 10,102 Reserve rights 25,586 (5,226) 20,360 25,586 (5,020) 20,566 Intellectual property 21,400 (2,339) 19,061 — — — Other 104,884 (7,183) 97,701 5,012 (585) 4,427 Total intangible assets $ 207,922 $ (28,335) $ 179,587 $ 87,053 $ (18,972) $ 68,081 Amortization expense totaled $9.2 million and $0.9 million for the three months ended March 30, 2024 and April 1, 2023, respectively. The estimated amortization expense for the intangible assets for each of the five years subsequent to March 30, 2024 is as follows: 2024 (nine months) $ 33,705 2025 44,713 2026 34,345 2027 6,629 2028 5,707 2029 4,999 Thereafter 49,489 Total $ 179,587

REVENUE RECOGNITION

REVENUE RECOGNITION	3 Months Ended
	Mar. 30, 2024
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 months ended March 30, 2024 and April 1, 2023 is as follows: Three months ended March 30, 2024 April 1, 2023 Revenue by product*: Aggregates $ 145,511 $ 143,653 Cement 224,097 49,013 Ready-mix concrete 312,047 138,778 Asphalt 27,985 26,635 Paving and related services 40,922 27,184 Other 54,453 50,125 Total revenue $ 805,015 $ 435,388 *Revenue from liquid asphalt terminals is included in asphalt revenue. Accounts receivable, net consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Trade accounts receivable $ 441,049 $ 228,697 Construction contract receivables 15,110 51,567 Retention receivables 10,649 13,541 Receivables from related parties 518 — Accounts receivable 467,326 293,805 Less: Allowance for doubtful accounts (12,676) (6,553) Accounts receivable, net $ 454,650 $ 287,252 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 months ended March 30, 2024 and April 1, 2023 is as follows: Three months ended March 30, 2024 April 1, 2023 Revenue by product*: Aggregates $ 145,511 $ 143,653 Cement 224,097 49,013 Ready-mix concrete 312,047 138,778 Asphalt 27,985 26,635 Paving and related services 40,922 27,184 Other 54,453 50,125 Total revenue $ 805,015 $ 435,388 *Revenue from liquid asphalt terminals is included in asphalt revenue. Accounts receivable, net consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Trade accounts receivable $ 441,198 $ 228,697 Construction contract receivables 15,110 51,567 Retention receivables 10,649 13,541 Receivables from related parties 518 — Accounts receivable 467,475 293,805 Less: Allowance for doubtful accounts (12,676) (6,553) Accounts receivable, net $ 454,799 $ 287,252 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	3 Months Ended
	Mar. 30, 2024
Inventory [Line Items]
INVENTORIES	INVENTORIES Inventories consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Aggregate stockpiles $ 172,593 $ 165,272 Finished goods 85,921 43,122 Work in process 22,507 10,702 Raw materials 57,480 22,254 Total $ 338,501 $ 241,350
Summit Materials, LLC
Inventory [Line Items]
INVENTORIES	INVENTORIES Inventories consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Aggregate stockpiles $ 172,593 $ 165,272 Finished goods 85,921 43,122 Work in process 22,507 10,702 Raw materials 57,480 22,254 Total $ 338,501 $ 241,350

ACCRUED EXPENSES

ACCRUED EXPENSES	3 Months Ended
	Mar. 30, 2024
Schedule Of Accrued Expenses [Line Items]
ACCRUED EXPENSES	ACCRUED EXPENSES Accrued expenses consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Interest $ 43,210 $ 27,593 Payroll and benefits 29,616 63,888 Finance lease obligations 4,698 4,020 Insurance 34,653 25,277 Current portion of accrued taxes and TRA liability 23,317 11,042 Deferred asset purchase payments 7,269 5,903 Professional fees 6,580 2,036 Other (1) 42,433 31,932 Total $ 191,776 $ 171,691 (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 March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Interest $ 43,210 $ 27,593 Payroll and benefits 29,616 63,888 Finance lease obligations 4,698 4,020 Insurance 34,653 25,277 Accrued taxes 21,475 12,285 Deferred asset purchase payments 7,269 5,903 Professional fees 6,580 2,036 Other (1) 42,433 31,932 Total $ 189,934 $ 172,934 _______________________________________________________________________ (1) Consists primarily of current portion of asset retirement obligations and miscellaneous accruals.

DEBT

DEBT	3 Months Ended
	Mar. 30, 2024
Debt Instrument [Line Items]
DEBT	DEBT Debt consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Term Loan, due 2029: $1,010.0 million and $504.5 million, net of $2.4 million and $4.0 million discount at March 30, 2024 and December 30, 2023, respectively $ 1,007,601 $ 500,473 6 1 ⁄ 2 % Senior Notes, due 2027 300,000 300,000 5 1 ⁄ 4 % Senior Notes, due 2029 700,000 700,000 7 1 ⁄ 4 % Senior Notes, due 2031 800,000 800,000 Total 2,807,601 2,300,473 Current portion of long-term debt 7,575 3,822 Long-term debt $ 2,800,026 $ 2,296,651 The contractual payments of long-term debt, including current maturities, for the five years subsequent to March 30, 2024, are as follows: 2024 (nine months) $ 5,050 2025 12,625 2026 10,100 2027 310,100 2028 10,100 2029 1,662,025 Thereafter 800,000 Total 2,810,000 Less: Original issue net discount (2,399) Less: Deferred financing costs (27,317) Total debt $ 2,780,284 Senior Notes — On December 14, 2023, Summit LLC and Summit Finance (together, the “Issuers”) issued $800.0 million in aggregate principal amount of 7.250% senior notes due January 15, 2031 (the “2031 Notes”). The 2031 Notes were issued at 100.0% of their par value with proceeds of $788.3 million, net of related fees and expenses. The 2031 Notes were issued under an indenture dated as of December 14, 2023 (the "2031 Notes Indenture"). The 2031 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 2031 Notes Indenture also contains customary events of default. The gross proceeds of the 2031 Notes were held in escrow as of December 30, 2023 as the proceeds were restricted to use for the cash consideration for the Transaction. The proceeds were released upon closing of the Transaction on January 12, 2024. Interest on the 2031 Notes is payable semi-annually on January 15 and July 15 of each year commencing on July 15, 2024. On August 11, 2020, 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 terms of which are generally consistent with the 2031 Notes Indenture. 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 2031 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 March 30, 2024 and December 30, 2023, the Company was in compliance with all covenants under the applicable indentures. Senior Secured Credit Facilities — On January 12, 2024, Summit Materials, LLC entered into Amendment No. 7 to the credit agreement governing the Senior Secured Credit Facilities (the “Credit Agreement”), which among other things: (1) established new term loans in an aggregate principal amount of $1.010 billion (the "Term Loan Facility") bearing interest, at Summit LLC’s option, based on either the base rate or Term SOFR rate and an applicable margin of (i) 1.50% per annum with respect to base rate borrowings and a floor of 1.00% per annum or (ii) 2.50% per annum with respect to Term SOFR borrowings and a floor of zero, resulting in a current interest rate as of March 30, 2024 of 7.83%. Amendment No. 7 also extended the maturity date for the Term Loan Facility to January 12, 2029. In addition, the new term loan is subject to a 1.00% prepayment premium in respect of any principal amount repaid in connection with certain repricing transactions occurring within six months following the Amendment No. 7 Effective Date and requires quarterly amortization payments of 0.25% of the principal amount of the Term Loan Facility on the Amendment No. 7 effective date and due on the last business day or each March, June, September and December, commencing with the June 2024 payment. The proceeds of the new term loans were used to (i) fund a portion of the cash consideration in connection with the closing of the Transaction, (ii) refinance the $504.5 million prior term loans outstanding, resulting in charges of $5.5 million which were recognized for the three months ended March 30, 2024, which included charges of $4.0 million for the write-off of original issue discount and $1.5 million for the write-off of deferred financing fees and (iii) pay fees, commissions and expenses in connection with the foregoing; (2) in respect of the revolving credit facility thereunder (the “Revolving Credit Facility”), (a) increased the total aggregate commitments under the Revolving Credit Facility from $395.0 million to $625.0 million and (b) reduced the applicable margin (with no leverage-based step downs) to (i) 1.50% per annum with respect to base rate borrowings and a floor of 1.00% per annum or (ii) 2.50% per annum with respect to Term SOFR borrowings and a floor of zero; and (3) modified certain covenants to provide greater flexibility for Summit LLC under the Credit Agreement. The revolving credit facility matures on January 10, 2028, provided that if more than $125 million of the 2027 Notes are outstanding as of December 14, 2026, then the maturity date of the revolving credit facility will be December 14, 2026. There were no outstanding borrowings under the revolving credit facility as of March 30, 2024 and December 30, 2023, with borrowing capacity of $604.1 million remaining as of March 30, 2024, 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. In connection with the combination with Argos USA described above, Summit assumed a letter of credit related to Argos USA's workers compensation claims and insurance liabilities equal to $11.4 million which expires August 2024. 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 March 30, 2024 and December 30, 2023, 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 including a real property exception, for the Senior Secured Credit Facilities. In September 2023, in connection with our agreement to acquire all of the outstanding equity interests of Argos USA, we obtained a $1.3 billion 364-day term loan bridge facility commitment from various financial institutions. The term loan bridge facility expired unused upon the closing of the Transaction in January 2024. The following table presents the activity for the deferred financing fees for the three months ended March 30, 2024 and April 1, 2023: Deferred financing fees Balance—December 30, 2023 $ 14,463 Loan origination fees 17,550 Amortization (1,550) Write off of deferred financing fees (1,462) Balance—March 30, 2024 $ 29,001 Balance—December 31, 2022 $ 11,489 Loan origination fees 1,566 Amortization (616) Write off of deferred financing fees (160) Balance—April 1, 2023 $ 12,279 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 March 30, 2024 or December 30, 2023, which may be terminated upon demand.
Summit Materials, LLC
Debt Instrument [Line Items]
DEBT	DEBT Debt consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Term Loan, due 2029: $1,010.0 million and $504.5 million, net of $2.4 million and $4.0 million discount at March 30, 2024 and December 30, 2023, respectively $ 1,007,601 $ 500,473 6 1/2 % Senior Notes, due 2027 300,000 300,000 5 1/4 % Senior Notes, due 2029 700,000 700,000 7 1 ⁄ 4 % Senior Notes, due 2031 800,000 800,000 Total 2,807,601 2,300,473 Current portion of long-term debt 7,575 3,822 Long-term debt $ 2,800,026 $ 2,296,651 The contractual payments of long-term debt, including current maturities, for the five years subsequent to March 30, 2024, are as follows: 2024 (nine months) $ 5,050 2025 12,625 2026 10,100 2027 310,100 2028 10,100 2029 1,662,025 Thereafter 800,000 Total 2,810,000 Less: Original issue net discount (2,399) Less: Deferred financing costs (27,317) Total debt $ 2,780,284 Senior Notes — On December 14, 2023, Summit LLC and Summit Finance (together, the “Issuers”) issued $800.0 million in aggregate principal amount of 7.250% senior notes due January 15, 2031 (the “2031 Notes”). The 2031 Notes were issued at 100.0% of their par value with proceeds of $788.3 million, net of related fees and expenses. The 2031 Notes were issued under an indenture dated as of December 14, 2023 (the "2031 Notes Indenture"). The 2031 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 2031 Notes Indenture also contains customary events of default. The gross proceeds of the 2031 Notes were held in escrow as of December 30, 2023 as the proceeds were restricted to use for the cash consideration for the Transaction. The proceeds were released upon closing of the Transaction on January 12, 2024. Interest on the 2031 Notes is payable semi-annually on January 15 and July 15 of each year commencing on July 15, 2024. On August 11, 2020, 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 terms of which are generally consistent with the 2031 Notes Indenture. 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” and, together with the 2029 Notes and the 2031 Notes, the “Senior 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 2031 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 March 30, 2024 and December 30, 2023, the Company was in compliance with all covenants under the applicable indentures. Senior Secured Credit Facilities — On January 12, 2024, Summit Materials, LLC entered into Amendment No. 7 to the credit agreement governing the Senior Secured Credit Facilities (the “Credit Agreement”), which among other things: (1) established new term loans in an aggregate principal amount of $1.010 billion (the "Term Loan Facility") bearing interest, at Summit LLC’s option, based on either the base rate or Term SOFR rate and an applicable margin of (i) 1.50% per annum with respect to base rate borrowings and a floor of 1.00% per annum or (ii) 2.50% per annum with respect to Term SOFR borrowings and a floor of zero, resulting in a current interest rate as of March 30, 2024 of 7.83%. Amendment No. 7 also extended the maturity date for the Term Loan Facility to January 12, 2029. In addition, the new term loan is subject to a 1.00% prepayment premium in respect of any principal amount repaid in connection with certain repricing transactions occurring within six months following the Amendment No. 7 Effective Date and requires quarterly amortization payments of 0.25% of the principal amount of the Term Loan Facility on the Amendment No. 7 effective date and due on the last business day or each March, June, September and December, commencing with the June 2024 payment. The proceeds of the new term loans were used to (i) fund a portion of the cash consideration in connection with the closing of the Transaction, (ii) refinance the $504.5 million prior term loans outstanding, resulting in charges of $5.5 million which were recognized for the three months ended March 30, 2024, which included charges of $4.0 million for the write-off of original issue discount and $1.5 million for the write-off of deferred financing fees and (iii) pay fees, commissions and expenses in connection with the foregoing; (2) in respect of the revolving credit facility thereunder (the “Revolving Credit Facility”), (a) increased the total aggregate commitments under the Revolving Credit Facility from $395.0 million to $625.0 million and (b) reduced the applicable margin (with no leverage-based step downs) to (i) 1.50% per annum with respect to base rate borrowings and a floor of 1.00% per annum or (ii) 2.50% per annum with respect to Term SOFR borrowings and a floor of zero; and (3) modified certain covenants to provide greater flexibility for Summit LLC under the Credit Agreement. The revolving credit facility matures on January 10, 2028, provided that if more than $125 million of the 2027 Notes are outstanding as of December 14, 2026, then the maturity date of the revolving credit facility will be December 14, 2026. There were no outstanding borrowings under the revolving credit facility as of March 30, 2024 and December 30, 2023, with borrowing capacity of $604.1 million remaining as of March 30, 2024, 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. In connection with the combination with Argos USA described above, Summit assumed a letter of credit related to Argos USA's workers compensation claims and insurance liabilities equal to $11.4 million which expires August 2024. 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 March 30, 2024 and December 30, 2023, 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, including a real property exception, for the Senior Secured Credit Facilities. In September 2023, in connection with our agreement to acquire all of the outstanding equity interests of Argos USA, we obtained a $1.3 billion 364-day term loan bridge facility commitment from various financial institutions. The term loan bridge facility expired unused upon the closing of the Transaction in January 2024. The following table presents the activity for the deferred financing fees for the three months ended March 30, 2024 and April 1, 2023: Deferred financing fees Balance—December 30, 2023 $ 14,463 Loan origination fees 17,550 Amortization (1,550) Write off of deferred financing fees (1,462) Balance—March 30, 2024 $ 29,001 Balance—December 31, 2022 $ 11,489 Loan origination fees 1,566 Amortization (616) Write off of deferred financing fees (160) Balance—April 1, 2023 $ 12,279 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 March 30, 2024 or December 30, 2023, which may be terminated upon demand.

INCOME TAXES

INCOME TAXES	3 Months Ended
	Mar. 30, 2024
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 benefit was $11.1 million and $6.5 million in the three months ended March 30, 2024 and April 1, 2023, respectively. The effective tax rate for Summit Inc. differs from the federal statutory tax rate primarily due to (1) basis differences in assets divested, (2) tax depletion expense in excess of the expense recorded under U.S. GAAP, (3) state taxes, (4) various other items such as limitations on meals and entertainment, certain stock compensation, non-deductible compensation paid to covered employees, and other costs. As of each of March 30, 2024 and December 30, 2023, Summit Inc. had a valuation allowance of $1.1 million, 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 months ended March 30, 2024 and April 1, 2023. 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 three months ended March 30, 2024, all of the remaining 763,243 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 and the Company recorded an increase in the TRA liability of approximately $6.7 million related to the exchanges. 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. No tax distributions were made by Summit Holdings in the three months ended March 30, 2024.
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 months ended March 30, 2024 and April 1, 2023. 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 March 30, 2024, Summit LLC had a current TRA interest asset of $3.5 million and a noncurrent TRA interest asset of $122.6 million.

EARNINGS PER SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 30, 2024
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 March 30, 2024 April 1, 2023 Net loss attributable to Summit Inc. $ (66,866) $ (30,804) Weighted average shares of Class A stock outstanding 167,446,041 118,564,556 Add: Nonvested restricted stock awards of retirement eligible shares 65,534 115,100 Weighted average shares outstanding 167,511,575 118,679,656 Basic loss per share $ (0.40) $ (0.26) Diluted net loss attributable to Summit Inc. $ (66,866) $ (30,804) Weighted average shares outstanding 167,511,575 118,679,656 Add: weighted average of LP Units — — Add: stock options — — Add: warrants — — Add: restricted stock units — — Add: performance stock units — — Weighted average dilutive shares outstanding 167,511,575 118,679,656 Diluted loss per share $ (0.40) $ (0.26) Excluded from the above calculations were the shares noted below as they were antidilutive: Three months ended March 30, 2024 April 1, 2023 Antidilutive shares: LP Units 511,565 1,311,257 Time-vesting stock options 239,429 279,680 Warrants 31,519 31,519 Time-vesting restricted stock units 1,186,426 1,051,844 Market-based restricted stock units 550,165 439,704

STOCKHOLDERS' EQUITY_MEMBERS' I

STOCKHOLDERS' EQUITY/MEMBERS' INTEREST	3 Months Ended
	Mar. 30, 2024
Schedule of Capitalization, Equity [Line Items]
STOCKHOLDERS' EQUITY	STOCKHOLDERS’ EQUITY 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 March 30, 2024, 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 30, 2023 119,529,380 763,243 120,292,623 99.4 % Exchanges during period 763,243 (763,243) — Stock option exercises 29,216 — 29,216 Issuance of Class A common stock 54,720,000 — 54,720,000 Other equity transactions 412,411 — 412,411 Balance — March 30, 2024 175,454,250 — 175,454,250 100.0 % Balance — December 31, 2022 118,408,655 1,312,004 119,720,659 98.9 % Exchanges during period 2,000 (2,000) — Stock option exercises 902 — 902 Other equity transactions 407,114 — 407,114 Balance — April 1, 2023 118,818,671 1,310,004 120,128,675 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 0.0% and 0.6% as of March 30, 2024 and December 30, 2023, 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 30, 2023 $ 6,840 $ 435 $ 7,275 Foreign currency translation adjustment, net of tax — (3,585) (3,585) Balance — March 30, 2024 $ 6,840 $ (3,150) $ 3,690 Balance — December 31, 2022 $ 6,356 $ (3,272) $ 3,084 Foreign currency translation adjustment, net of tax — 161 161 Balance — April 1, 2023 $ 6,356 $ (3,111) $ 3,245
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 30, 2023 $ (120) $ (15,689) $ (15,809) Foreign currency translation adjustment — (4,724) (4,724) Balance — March 30, 2024 $ (120) $ (20,413) $ (20,533) Balance — December 31, 2022 $ (762) $ (20,614) $ (21,376) Foreign currency translation adjustment — 203 203 Balance — April 1, 2023 $ (762) $ (20,411) $ (21,173)

SUPPLEMENTAL CASH FLOW INFORMAT

SUPPLEMENTAL CASH FLOW INFORMATION	3 Months Ended
	Mar. 30, 2024
Schedule Of Cash Flow Supplemental [Line Items]
SUPPLEMENTAL CASH FLOW INFORMATION	SUPPLEMENTAL CASH FLOW INFORMATION Supplemental cash flow information is as follows: Three months ended March 30, 2024 April 1, 2023 Cash payments: Interest $ 32,422 $ 37,970 Payments for income taxes, net 2,623 2,088 Operating cash payments on operating leases 4,846 2,402 Operating cash payments on finance leases 694 149 Finance cash payments on finance leases 1,572 4,011 Non cash investing and financing activities: Accrued liabilities for purchases of property, plant and equipment $ 29,281 $ 21,911 Right of use assets obtained in exchange for operating lease obligations 62,305 679 Right of use assets obtained in exchange for finance leases obligations 26,235 413 Exchange of LP Units to shares of Class A common stock 32,633 60 Issuance of Class A common stock 1,973,750 — On January 12, 2024, Summit completed a combination with Argos USA, Cementos Argos, Argos SEM LLC and Valle Cement Investments, Inc., pursuant to which Summit acquired all of the outstanding equity interests of Argos USA from the Argos SEM LLC and Valle Cement Investments, Inc.. Non-cash transactions related to the combination includes issuance of 54,720,000 shares of Summit Inc.'s Class A common stock and 1 preferred share.
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: Three months ended March 30, 2024 April 1, 2023 Cash payments: Interest $ 32,422 $ 37,970 Payments for income taxes, net 2,623 2,088 Operating cash payments on operating leases 4,846 2,402 Operating cash payments on finance leases 694 149 Finance cash payments on finance leases 1,572 4,011 Non cash investing and financing activities: Accrued liabilities for purchases of property, plant and equipment $ 29,281 $ 21,911 Right of use assets obtained in exchange for operating lease obligations 62,305 679 Right of use assets obtained in exchange for finance leases obligations 26,235 413

LEASES

LEASES	3 Months Ended
	Mar. 30, 2024
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 March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887
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 March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887
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 March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887
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 March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 30, 2024
Loss Contingencies [Line Items]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES The Company is party to certain legal actions arising from its ordinary course of business activities. In the opinion of management, these actions will not have a material effect on the Company’s financial position, results of operations or liquidity. The Company’s policy is to record legal accruals when the outcome is probable and can be reasonably estimated and to record 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. On January 4, 2021, prior to our transaction date, our subsidiary Argos USA entered into a Deferred Prosecution Agreement (“DPA”) with the U.S. Department of Justice (“DOJ”) related to the sale of ready-mix concrete in the greater Savannah, Georgia area by a small number of employees who joined the Company in October 2011 and were subsequently terminated. Pursuant to the DPA, Argos USA paid a monetary penalty of $20.0 million and was required, among other things, to periodically review and update its antitrust compliance program. The three-year term of the DPA expired on January 4, 2024. As Argos USA fully complied with the terms of the DPA, on January 18, 2024, following the conclusion of the DPA’s three-year term, the United States District Court for the Southern District of Georgia dismissed the criminal charge that was filed against the company in January 2021. Argos USA’s failure to comply with the terms and conditions of the DPA could result in additional criminal prosecution or penalties as well as continued expenses in defending these proceedings. In addition, Argos USA has been named a defendant in a putative class action filed under the caption Pro Slab, Inc. et al. v. Argos USA LLC et al. on behalf of purchasers of ready-mix concrete on November 22, 2017 in the U.S. District Court for the District of South Carolina and includes allegations of price-fixing, market allocation and other anti-competitive practices in the Savannah, Georgia and Charleston, South Carolina markets, seeking monetary damages and other remedies. This case was stayed on February 9, 2022 pending the resolution of the same criminal indictments, and only limited, written discovery may proceed while this stay is in effect. On June 13, 2023, prior to our transaction date, Argos USA entered into a settlement and compliance agreement with the Federal Highway Administration of the U.S. Department of Transportation that requires, among other things, appointment of an independent monitor until June 2025 to monitor, among other things, bids or awards of publicly funded contracts in Georgia and South Carolina for our ready-mix and cement business, as well as our code of business conduct, antitrust compliance policy, and antitrust compliance program. 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 March 30, 2024 and December 30, 2023, $45.3 million and $44.8 million, respectively, were included in other noncurrent liabilities on the consolidated balance sheets and $5.9 million and $5.1 million, respectively, were included in accrued expenses for future reclamation costs. The total undiscounted anticipated costs for site reclamation as of March 30, 2024 and December 30, 2023 were $173.3 million and $141.8 million, respectively. Payment In Lieu Of Taxes (“PILOT”) Agreemen t — In connection with the Transaction, Summit assumed a PILOT agreement related to the Martinsburg, West Virginia cement plant entered into by Argos USA pursuant to an acquisition that occurred in 2016. This agreement, which includes a continuing employment base requirement and other requirements, is in effect through fiscal year 2034. Under this agreement, certain property was conveyed to the West Virginia Economic Development Authority in exchange for certain local tax incentives. The $460.0 million receivable from the municipality related to the conveyance of the property, and the $460.0 million liability associated with the financing, have been offset in the consolidated balance sheets as the opening balance sheet. The annual payment related to the financing, and receipts related to the conveyance of the property for year-ended December 30, 2023 approximated $27.1 million. 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 its ordinary course of business activities. In the opinion of management, these actions will not have a material effect on the Company’s financial position, results of operations or liquidity. The Company’s policy is to record legal accruals when the outcome is probable and can be reasonably estimated and to record 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. On January 4, 2021, prior to our transaction date, our subsidiary Argos USA entered into a Deferred Prosecution Agreement (“DPA”) with the U.S. Department of Justice (“DOJ”) related to the sale of ready-mix concrete in the greater Savannah, Georgia area by a small number of employees who joined the Company in October 2011 and were subsequently terminated. Pursuant to the DPA, Argos USA paid a monetary penalty of $20.0 million and was required, among other things, to periodically review and update its antitrust compliance program. The three-year term of the DPA expired on January 4, 2024. As Argos USA fully complied with the terms of the DPA, on January 18, 2024, following the conclusion of the DPA’s three-year term, the United States District Court for the Southern District of Georgia dismissed the criminal charge that was filed against the company in January 2021. Argos USA’s failure to comply with the terms and conditions of the DPA could result in additional criminal prosecution or penalties as well as continued expenses in defending these proceedings. In addition, Argos USA has been named a defendant in a putative class action filed under the caption Pro Slab, Inc. et al. v. Argos USA LLC et al. on behalf of purchasers of ready-mix concrete on November 22, 2017 in the U.S. District Court for the District of South Carolina and includes allegations of price-fixing, market allocation and other anti-competitive practices in the Savannah, Georgia and Charleston, South Carolina markets, seeking monetary damages and other remedies. This case was stayed on February 9, 2022 pending the resolution of the same criminal indictments, and only limited, written discovery may proceed while this stay is in effect. On June 13, 2023, prior to our transaction date, Argos USA entered into a settlement and compliance agreement with the Federal Highway Administration of the U.S. Department of Transportation that requires, among other things, appointment of an independent monitor until June 2025 to monitor, among other things, bids or awards of publicly funded contracts in Georgia and South Carolina for our ready-mix and cement business, as well as our code of business conduct, antitrust compliance policy, and antitrust compliance program. 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 March 30, 2024 and December 30, 2023, $45.3 million and $44.8 million, respectively, were included in other noncurrent liabilities on the consolidated balance sheets and $5.9 million and $5.1 million, respectively, were included in accrued expenses for future reclamation costs. The total undiscounted anticipated costs for site reclamation as of March 30, 2024 and December 30, 2023 were $173.3 million and $141.8 million, respectively. Payment In Lieu Of Taxes (“PILOT”) Agreemen t — In connection with the Transaction, Summit Inc. assumed a PILOT agreement related to the Martinsburg, West Virginia cement plant entered into by Argos USA pursuant to an acquisition that occurred in 2016. This agreement, which includes a continuing employment base requirement and other requirements, is in effect through fiscal year 2034. Under this agreement, certain property was conveyed to the West Virginia Economic Development Authority in exchange for certain local tax incentives. The $460.0 million receivable from the municipality related to the conveyance of the property, and the $460.0 million liability associated with the financing, have been offset in the consolidated balance sheets as the opening balance sheet. The annual payment related to the financing, and receipts related to the conveyance of the property for year-ended December 30, 2023 approximated $27.1 million. 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	3 Months Ended
	Mar. 30, 2024
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 March 30, 2024 and December 30, 2023 was: March 30, 2024 December 30, 2023 Current portion of acquisition-related liabilities and Accrued expenses: Contingent consideration $ 1,701 $ 139 Acquisition-related liabilities and Other noncurrent liabilities: Contingent consideration $ 7,727 $ 9,254 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 March 30, 2024 and April 1, 2023. 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 March 30, 2024 and December 30, 2023 was: March 30, 2024 December 30, 2023 Fair Value Carrying Value Fair Value Carrying Value Level 1 Long-term debt(1) $ 2,826,313 $ 2,807,601 $ 2,329,606 $ 2,300,473 Level 3 Current portion of deferred consideration and noncompete obligations(2) 7,292 7,292 6,868 6,868 Long term portion of deferred consideration and noncompete obligations(3) 12,928 12,928 18,767 18,767 (1) $7.6 million and $3.8 million was included in current portion of debt as of March 30, 2024 and December 30, 2023, 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 March 30, 2024 and December 30, 2023 was: March 30, 2024 December 30, 2023 Current portion of acquisition-related liabilities and Accrued expenses: Contingent consideration $ 1,701 $ 139 Acquisition-related liabilities and Other noncurrent liabilities: Contingent consideration $ 7,727 $ 9,254 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 March 30, 2024 and April 1, 2023. 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 March 30, 2024 and December 30, 2023 was: March 30, 2024 December 30, 2023 Fair Value Carrying Value Fair Value Carrying Value Level 1 Long-term debt(1) $ 2,826,313 $ 2,807,601 $ 2,329,606 $ 2,300,473 Level 3 Current portion of deferred consideration and noncompete obligations(2) 7,292 7,292 6,868 6,868 Long term portion of deferred consideration and noncompete obligations(3) 12,928 12,928 18,767 18,767 (1) $7.6 million and $3.8 million was included in current portion of debt as of March 30, 2024 and December 30, 2023, 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	3 Months Ended
	Mar. 30, 2024
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 March 30, 2024 and December 30, 2023 and for the three months ended March 30, 2024 and April 1, 2023: Three months ended March 30, 2024 April 1, 2023 Revenue*: West $ 304,538 $ 250,882 East 268,694 130,389 Cement 231,783 54,117 Total revenue $ 805,015 $ 435,388 *Intercompany sales are immaterial and the presentation above only reflects sales to external customers. Three months ended March 30, 2024 April 1, 2023 Loss from operations before taxes $ (78,335) $ (37,678) Interest expense 51,892 27,420 Depreciation, depletion and amortization 94,963 50,188 Accretion 1,008 706 Loss on debt financings 5,453 493 Gain on sale of businesses (14,985) — Non-cash compensation 6,720 4,708 Argos USA acquisition and integration costs 61,294 — Other (6,785) (4,636) Total Adjusted EBITDA $ 121,225 $ 41,201 Total Adjusted EBITDA by Segment: West $ 43,400 $ 32,678 East 37,476 18,852 Cement 59,454 10 Corporate and other (19,105) (10,339) Total Adjusted EBITDA $ 121,225 $ 41,201 Three months ended March 30, 2024 April 1, 2023 Purchases of property, plant and equipment West $ 25,844 $ 38,174 East 16,224 15,518 Cement 12,036 6,996 Total reportable segments 54,104 60,688 Corporate and other 4,415 2,896 Total purchases of property, plant and equipment $ 58,519 $ 63,584 Three months ended March 30, 2024 April 1, 2023 Depreciation, depletion, amortization and accretion: West $ 30,338 $ 26,373 East 23,081 15,535 Cement 40,705 7,998 Total reportable segments 94,124 49,906 Corporate and other 1,847 988 Total depreciation, depletion, amortization and accretion $ 95,971 $ 50,894 March 30, 2024 December 30, 2023 Total assets: West $ 1,970,633 $ 1,837,214 East 1,608,962 1,171,944 Cement 4,032,512 904,508 Total reportable segments 7,612,107 3,913,666 Corporate and other 517,793 1,235,916 Total $ 8,129,900 $ 5,149,582
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 March 30, 2024 and December 30, 2023 and for the three months ended March 30, 2024 and April 1, 2023: Three months ended March 30, 2024 April 1, 2023 Revenue*: West $ 304,538 $ 250,882 East 268,694 130,389 Cement 231,783 54,117 Total revenue $ 805,015 $ 435,388 *Intercompany sales are immaterial and the presentation above only reflects sales to external customers. Three months ended March 30, 2024 April 1, 2023 Loss from operations before taxes $ (78,526) $ (37,678) Interest expense 51,892 27,420 Depreciation, depletion and amortization 94,963 50,188 Accretion 1,008 706 Loss on debt financings 5,453 493 Gain on sale of businesses (14,985) — Non-cash compensation 6,720 4,708 Argos USA acquisition and integration costs 61,294 — Other (6,594) (4,636) Total Adjusted EBITDA $ 121,225 $ 41,201 Total Adjusted EBITDA by Segment: West $ 43,400 $ 32,678 East 37,476 18,852 Cement 59,454 10 Corporate and other (19,105) (10,339) Total Adjusted EBITDA $ 121,225 $ 41,201 Three months ended March 30, 2024 April 1, 2023 Purchases of property, plant and equipment West $ 25,844 $ 38,174 East 16,224 15,518 Cement 12,036 6,996 Total reportable segments 54,104 60,688 Corporate and other 4,415 2,896 Total purchases of property, plant and equipment $ 58,519 $ 63,584 Three months ended March 30, 2024 April 1, 2023 Depreciation, depletion, amortization and accretion: West $ 30,338 $ 26,373 East 23,081 15,535 Cement 40,705 7,998 Total reportable segments 94,124 49,906 Corporate and other 1,847 988 Total depreciation, depletion, amortization and accretion $ 95,971 $ 50,894 March 30, 2024 December 30, 2023 Total assets: West $ 1,970,633 $ 1,837,214 East 1,608,962 1,171,944 Cement 4,032,512 904,508 Total reportable segments 7,612,107 3,913,666 Corporate and other 633,171 1,298,863 Total $ 8,245,278 $ 5,212,529

Related Party Disclosures

Related Party Disclosures	3 Months Ended
	Mar. 30, 2024
Related Party Transaction [Line Items]
RELATED PARTY	RELATED PARTY TRANSACTIONS As part of the combination with Argos USA, we entered into several agreements with affiliates of Cementos Argos as follows: We entered into agreements whereby Cementos Argos or an affiliate of Cementos Argos provides various administrative and technical services. The technical service agreement can be terminated with six months advance notice, while the support services agreement expires January 2026. During the first quarter 2024, we paid $0.3 million under these agreements and is included in general and administrative costs in our statement of operations. We also entered into a cement supply agreement with Cementos Argos with an initial term expiring December 31, 2028. Under this agreement, we will purchase a minimum volume of 425,000 metric tons of cement from an affiliate of Cementos Argos. The purchase price of the cement will be at market prices based on third party quotes. In the first quarter of 2024, we purchased $9.1 million of cement under the cement supply agreement. Cement purchases are capitalized into inventory on the consolidated balance sheet. We also entered into various agreements whereby an affiliate of Cementos Argos will provide logistics support for importing cement to our terminals. During the first quarter of 2024, we paid the affiliate $5.0 million under the logistics supply agreement, and these costs are capitalized into inventory on our consolidated balance sheet. We entered into a master purchase agreement where by we will utilize the services of an affiliate of Cementos Argos to negotiate and coordinate supply agreements with international suppliers for the purchase of cement and other materials. This agreement expires December 31, 2025. During the first quarter of 2024, we paid $0.3 million under the master purchase agreement, and these costs are capitalized into inventory on our consolidated balance sheet.
Summit Materials, LLC
Related Party Transaction [Line Items]
RELATED PARTY	RELATED PARTY TRANSACTIONS As part of the combination with Argos USA, we entered into several agreements with affiliates of Cementos Argos as follows: We entered into agreements whereby Cementos Argos or an affiliate of Cementos Argos provides various administrative and technical services. The technical service agreement can be terminated with six months advance notice, while the support services agreement expires January 2026. During the first quarter 2024, we paid $0.3 million under these agreements and is included in general and administrative costs in our statement of operations. We also entered into a cement supply agreement with Cementos Argos with an initial term expiring December 31, 2028. Under this agreement, we will purchase a minimum volume of 425,000 metric tons of cement from an affiliate of Cementos Argos. The purchase price of the cement will be at market prices based on third party quotes. In the first quarter of 2024, we purchased $9.1 million of cement under the cement supply agreement. Cement purchases are capitalized into inventory on the consolidated balance sheet. We also entered into various agreements whereby an affiliate of Cementos Argos will provide logistics support for importing cement to our terminals. During the first quarter of 2024, we paid the affiliate $5.0 million under the logistics supply agreement, and these costs are capitalized into inventory on our consolidated balance sheet. We entered into a master purchase agreement where by we will utilize the services of an affiliate of Cementos Argos to negotiate and coordinate supply agreements with international suppliers for the purchase of cement and other materials. This agreement expires December 31, 2025. During the first quarter of 2024, we paid $0.3 million under the master purchase agreement, and these costs are capitalized into inventory on our consolidated balance sheet.

GUARANTOR AND NON-GUARANTOR FIN

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION	3 Months Ended
	Mar. 30, 2024
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 March 30, 2024 Non- Issuers Guarantors Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 444,621 $ 3,035 $ 41,760 $ (3,208) $ 486,208 Accounts receivable, net 1,723 433,440 19,613 23 454,799 Intercompany receivables 2,962,527 2,333,674 — (5,296,201) — Cost and estimated earnings in excess of billings — 10,722 959 — 11,681 Inventories — 330,727 7,774 — 338,501 Other current assets 6,675 36,480 2,364 — 45,519 Total current assets 3,415,546 3,148,078 72,470 (5,299,386) 1,336,708 Property, plant and equipment, net 43,770 4,292,849 80,736 — 4,417,355 Goodwill — 1,934,795 56,687 — 1,991,482 Intangible assets, net — 175,298 4,289 — 179,587 Operating lease right-of-use assets 8,539 76,672 4,040 — 89,251 Other assets 5,391,496 280,725 1,017 (5,442,343) 230,895 Total assets $ 8,859,351 $ 9,908,417 $ 219,239 $ (10,741,729) $ 8,245,278 Liabilities and Members' Interest Current liabilities: Current portion of debt $ 7,575 $ — $ — $ — $ 7,575 Current portion of acquisition-related liabilities — 8,993 — — 8,993 Accounts payable 33,255 249,732 8,053 (126) 290,914 Accrued expenses 100,272 90,021 2,849 (3,208) 189,934 Current operating lease liabilities 1,329 14,862 554 — 16,745 Intercompany payables 1,418,021 3,876,327 1,704 (5,296,052) — Billings in excess of costs and estimated earnings — 5,495 510 — 6,005 Total current liabilities 1,560,452 4,245,430 13,670 (5,299,386) 520,166 Long-term debt 2,772,709 — — — 2,772,709 Acquisition-related liabilities — 20,655 — — 20,655 Noncurrent operating lease liabilities 12,163 63,140 3,315 — 78,618 Other noncurrent liabilities 270,274 318,398 119,290 (98,585) 609,377 Total liabilities 4,615,598 4,647,623 136,275 (5,397,971) 4,001,525 Total members' interest 4,243,753 5,260,794 82,964 (5,343,758) 4,243,753 Total liabilities and members' interest $ 8,859,351 $ 9,908,417 $ 219,239 $ (10,741,729) $ 8,245,278 Condensed Consolidating Balance Sheets December 30, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 310,410 $ 3,115 $ 44,899 $ (2,755) $ 355,669 Restricted cash 800,000 — — — 800,000 Accounts receivable, net 6,441 255,836 24,998 (23) 287,252 Intercompany receivables 1,087,570 2,331,879 — (3,419,449) — Cost and estimated earnings in excess of billings — 9,228 1,061 — 10,289 Inventories — 234,738 6,612 — 241,350 Other current assets 11,480 13,264 645 — 25,389 Total current assets 2,215,901 2,848,060 78,215 (3,422,227) 1,719,949 Property, plant and equipment, net 35,812 1,858,020 82,988 — 1,976,820 Goodwill — 1,167,685 58,176 — 1,225,861 Intangible assets, net — 63,655 4,426 — 68,081 Operating lease right-of-use assets 3,749 28,511 4,293 — 36,553 Other assets 5,384,259 235,719 933 (5,435,646) 185,265 Total assets $ 7,639,721 $ 6,201,650 $ 229,031 $ (8,857,873) $ 5,212,529 Liabilities and Members' Interest Current liabilities: Current portion of debt $ 3,822 $ — $ — $ — $ 3,822 Current portion of acquisition-related liabilities — 7,007 — — 7,007 Accounts payable 4,290 111,061 8,293 (23) 123,621 Accrued expenses 88,318 82,065 5,306 (2,755) 172,934 Current operating lease liabilities 804 7,230 562 — 8,596 Intercompany payables 2,890,124 525,230 4,095 (3,419,449) — Billings in excess of costs and estimated earnings — 7,280 948 — 8,228 Total current liabilities 2,987,358 739,873 19,204 (3,422,227) 324,208 Long-term debt 2,283,639 — — — 2,283,639 Acquisition-related liabilities — 28,021 — — 28,021 Noncurrent operating lease liabilities 7,951 21,587 3,692 — 33,230 Other noncurrent liabilities 5,768 196,759 119,820 (133,921) 188,426 Total liabilities 5,284,716 986,240 142,716 (3,556,148) 2,857,524 Total members' interest 2,355,005 5,215,410 86,315 (5,301,725) 2,355,005 Total liabilities and members' interest $ 7,639,721 $ 6,201,650 $ 229,031 $ (8,857,873) $ 5,212,529 Condensed Consolidating Statements of Operations For the three months ended March 30, 2024 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 823,366 $ 22,140 $ (40,491) $ 805,015 Cost of revenue (excluding items shown separately below) — 649,602 14,900 (40,491) 624,011 General and administrative expenses 49,110 79,117 1,659 — 129,886 Depreciation, depletion, amortization and accretion 1,846 91,191 2,934 — 95,971 Operating (loss) income (50,956) 3,456 2,647 — (44,853) Other income, net (44,353) (1,383) (608) 43,110 (3,234) Interest expense (income) 70,951 (20,431) 1,372 — 51,892 Gain on sale of business — (14,985) — — (14,985) (Loss) income from operation before taxes (77,554) 40,255 1,883 (43,110) (78,526) Income tax expense (benefit) 776 (1,482) 510 — (196) Net (loss) income attributable to Summit LLC $ (78,330) $ 41,737 $ 1,373 $ (43,110) $ (78,330) Comprehensive (loss) income attributable to member of Summit Materials, LLC $ (83,054) $ 41,737 $ 6,097 $ (47,834) $ (83,054) Condensed Consolidating Statements of Operations For the three months ended April 1, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 408,422 $ 27,761 $ (795) $ 435,388 Cost of revenue (excluding items shown separately below) — 335,210 19,622 (795) 354,037 General and administrative expenses 15,221 28,947 1,764 — 45,932 Depreciation, depletion, amortization and accretion 988 47,153 2,753 — 50,894 Operating (loss) income (16,209) (2,888) 3,622 — (15,475) Other income, net (19,147) (277) (508) 14,715 (5,217) Interest expense (income) 39,845 (13,795) 1,370 — 27,420 Loss on sale of business — — — — — (Loss) income from operation before taxes (36,907) 11,184 2,760 (14,715) (37,678) Income tax expense (benefit) 304 (1,510) 739 — (467) Net (loss) income attributable to Summit LLC $ (37,211) $ 12,694 $ 2,021 $ (14,715) $ (37,211) Comprehensive (loss) income attributable to member of Summit Materials, LLC $ (37,008) $ 12,694 $ 1,818 $ (14,512) $ (37,008) Condensed Consolidating Statements of Cash Flows For the three months ended March 30, 2024 Non- Issuers Guarantors Guarantors Eliminations Consolidated Net cash (used in) provided by operating activities $ (22,707) $ (14,571) $ 3,773 $ — $ (33,505) Cash flow from investing activities: Acquisitions, net of cash acquired 97,153 (1,198,072) — — (1,100,919) Purchase of property, plant and equipment (4,415) (52,077) (2,027) — (58,519) Proceeds from the sale of property, plant, and equipment — 2,662 2 — 2,664 Proceeds from the sale of a business — 75,993 — — 75,993 Other — (22,640) — — (22,640) Net cash provided by (used in) investing activities 92,738 (1,194,134) (2,025) — (1,103,421) Cash flow from financing activities: Capital distributions to member (52,015) 52,608 — — 593 Net proceeds from debt issuance 1,007,475 — — — 1,007,475 Loans received from and payments made on loans from other Summit Companies (1,161,406) 1,165,362 (3,503) (453) — Payments on long-term debt (504,464) (1,928) — — (506,392) Payments on acquisition-related liabilities — (6,124) — — (6,124) Debt issuance costs (17,550) — — — (17,550) Other (7,860) (1,293) (256) — (9,409) Net cash (used in) provided by financing activities (735,820) 1,208,625 (3,759) (453) 468,593 Impact of cash on foreign currency — — (1,128) — (1,128) Net increase (decrease) in cash and cash equivalents and restricted cash (665,789) (80) (3,139) (453) (669,461) Cash and cash equivalents and restricted cash—beginning of period 1,110,410 3,115 44,899 (2,755) 1,155,669 Cash and cash equivalents and restricted cash—end of period $ 444,621 $ 3,035 $ 41,760 $ (3,208) $ 486,208 Condensed Consolidating Statements of Cash Flows For the three months ended April 1, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Net cash (used in) provided by operating activities $ (55,528) $ 49,394 $ 6,469 $ — $ 335 Cash flow from investing activities: Acquisitions, net of cash acquired — (55,477) — — (55,477) Purchase of property, plant and equipment (2,895) (58,356) (2,333) — (63,584) Proceeds from the sale of property, plant, and equipment — 1,777 — — 1,777 Other — (1,045) — — (1,045) Net cash used in investing activities (2,895) (113,101) (2,333) — (118,329) Cash flow from financing activities: Capital distributions to member (55,870) 55,885 — — 15 Loans received from and payments made on loans from other Summit Companies (25,853) 24,951 (2,646) 3,548 — Payments on long-term debt (1,274) (3,140) — — (4,414) Payments on acquisition-related liabilities — (11,374) — — (11,374) Debt issuance costs (1,566) — — — (1,566) Other (2,740) (2,766) (213) — (5,719) Net cash (used in) provided by financing activities (87,303) 63,556 (2,859) 3,548 (23,058) Impact of cash on foreign currency — — 58 — 58 Net increase (decrease) in cash and cash equivalents (145,726) (151) 1,335 3,548 (140,994) Cash and cash equivalents—beginning of period 498,307 2,864 26,298 (7,018) 520,451 Cash and cash equivalents—end of period $ 352,581 $ 2,713 $ 27,633 $ (3,470) $ 379,457

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Pay vs Performance Disclosure
Net income (loss)	$ (66,866)	$ (30,804)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 30, 2024
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)	3 Months Ended
	Mar. 30, 2024
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 30, 2023. 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 March 30, 2024, the results of operations for the three months ended March 30, 2024 and April 1, 2023 and cash flows for the three months ended March 30, 2024 and April 1, 2023.
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 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—
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. 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.
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 30, 2023. 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 March 30, 2024, the results of operations for the three months ended March 30, 2024 and April 1, 2023 and cash flows for the three months ended March 30, 2024 and April 1, 2023.
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 24 U.S. states and in British Columbia, Canada, with the most significant revenue generated in Texas, Florida, Georgia, Utah, Missouri and Kansas. 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.
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)	3 Months Ended
	Mar. 30, 2024
Business Acquisition [Line Items]
Schedule of Business Acquisition, Pro Forma Information	The following table includes unaudited pro forma financial information that presents the consolidated results of operations for the three months ended March 30, 2024 and April 1, 2023 as if the Transaction had occurred on January 1, 2023. Q1 2024 Q1 2023 Total Revenues $ 848,902 $ 835,396 Net income attributable to Summit Inc. $ (66,269) $ (35,844) The unaudited pro forma financial information is provided for informational purposes only and is not necessarily indicative of the consolidated results of operations of the Company had the combination actually occurred on January 1, 2023, nor of the results of our future operations of the combined business. The pro forma results are based on the preliminary purchase price allocation and will be updated to reflect the final amounts as the allocation is finalized during the measurement period. Fair value of consideration transferred Cash consideration $ 1,145,463 Fair value of stock consideration issued 1,973,750 Total fair value of consideration transferred $ 3,119,213
Schedule of Assets Acquired and Liabilities Assumed	The following table summarizes the preliminary allocation of the purchase price to the fair value of assets acquired and liabilities assumed. Purchase Price $ 3,119,213 Asset acquired: Cash and cash equivalents 97,153 Accounts receivable, net 156,195 Inventories 95,448 Other current assets 18,178 Intangible assets, net 100,000 Property, plant and equipment, net 2,447,340 Operating lease right of use assets 55,756 Other assets 52,684 Liabilities assumed: Accounts payable (113,929) Accrued expenses (73,039) Current operating lease liabilities (7,545) Noncurrent operating lease liabilities (48,211) Deferred tax liabilities (263,530) Other noncurrent liabilities (166,233) Fair value of identifiable net assets acquired 2,350,267 Goodwill $ 768,946 Three months ended Year ended March 30, 2024 December 30, 2023 Financial assets $ 1,740 $ 12,747 Inventories 161 6,251 Property, plant and equipment 15,170 125,207 Other assets 333 1,085 Financial liabilities (903) (11,973) Other long-term liabilities (407) (802) Net assets acquired 16,094 132,515 Goodwill 36,515 108,590 Purchase price 52,609 241,105 Other — (1,597) Net cash paid for acquisitions $ 52,609 $ 239,508
Schedule Of Acquisitions By Region	The following table summarizes the Company’s other acquisitions by region and period: Three months ended Year ended March 30, 2024 December 30, 2023 West* 1 3 East* — 1 Cement* — — _______________________________________________________________________ * The combination with Argos USA affected all three reporting segments. In addition to the acquisition of all of the outstanding equity interests of Argos USA, we also acquired one aggregates-based operation in our West segment.
Schedule of Goodwill by Reportable Segment and in Total	Changes in the carrying amount of goodwill, by reportable segment, from December 30, 2023 to March 30, 2024 are summarized as follows: West East Cement Total Balance—December 30, 2023 $ 658,704 $ 361,501 $ 204,656 $ 1,224,861 Acquisitions (1) 36,101 — 768,946 805,047 Dispositions (2) — (37,938) — (37,938) Foreign currency translation adjustments (1,488) — — (1,488) Balance—March 30, 2024 $ 693,317 $ 323,563 $ 973,602 $ 1,990,482 _______________________________________________________________________ (1) Reflects goodwill from 2024 acquisitions and working capital adjustments from prior year acquisitions. (2) Reflects goodwill derecognition from dispositions completed during 2024.
Schedule of Intangible Assets by Type and in Total	The following table shows intangible assets by type and in total: March 30, 2024 December 30, 2023 Gross Accumulated Net Gross Accumulated Net Operating permits $ 38,677 $ (6,089) $ 32,588 $ 38,677 $ (5,691) $ 32,986 Mineral leases 17,375 (7,498) 9,877 17,778 (7,676) 10,102 Reserve rights 25,586 (5,226) 20,360 25,586 (5,020) 20,566 Intellectual property 21,400 (2,339) 19,061 — — — Other 104,884 (7,183) 97,701 5,012 (585) 4,427 Total intangible assets $ 207,922 $ (28,335) $ 179,587 $ 87,053 $ (18,972) $ 68,081
Schedule of Estimated Amortization Expense for Intangible Assets	The estimated amortization expense for the intangible assets for each of the five years subsequent to March 30, 2024 is as follows: 2024 (nine months) $ 33,705 2025 44,713 2026 34,345 2027 6,629 2028 5,707 2029 4,999 Thereafter 49,489 Total $ 179,587
Summit Materials, LLC
Business Acquisition [Line Items]
Schedule of Business Acquisition, Pro Forma Information	The following table includes unaudited pro forma financial information that presents the consolidated results of operations for the three months ended March 30, 2024 and April 1, 2023 as if the Transaction had occurred on January 1, 2023. Q1 2024 Q1 2023 Total Revenues $ 848,902 $ 835,396 Net income attributable to Summit Inc. $ (66,269) $ (35,844) The unaudited pro forma financial information is provided for informational purposes only and is not necessarily indicative of the consolidated results of operations of the Company had the combination actually occurred on January 1, 2023, nor of the results of our future operations of the combined business. The pro forma results are based on the preliminary purchase price allocation and will be updated to reflect the final amounts as the allocation is finalized during the measurement period. Fair value of consideration transferred Cash consideration $ 1,145,463 Fair value of stock consideration issued 1,973,750 Total fair value of consideration transferred $ 3,119,213
Schedule of Assets Acquired and Liabilities Assumed	The following table summarizes the preliminary allocation of the purchase price to the fair value of assets acquired and liabilities assumed. Purchase Price $ 3,119,213 Asset acquired: Cash and cash equivalents 97,153 Accounts receivable, net 156,195 Inventories 95,448 Other current assets 18,178 Intangible assets, net 100,000 Property, plant and equipment, net 2,447,340 Operating lease right of use assets 55,756 Other assets 52,684 Liabilities assumed: Accounts payable (113,929) Accrued expenses (73,039) Current operating lease liabilities (7,545) Noncurrent operating lease liabilities (48,211) Deferred tax liabilities (263,530) Other noncurrent liabilities (166,233) Fair value of identifiable net assets acquired 2,350,267 Goodwill $ 768,946 Three months ended Year ended March 30, 2024 December 30, 2023 Financial assets $ 1,740 $ 12,747 Inventories 161 6,251 Property, plant and equipment 15,170 125,207 Other assets 333 1,085 Financial liabilities (903) (11,973) Other long-term liabilities (407) (802) Net assets acquired 16,094 132,515 Goodwill 36,515 108,590 Purchase price 52,609 241,105 Other — (1,597) Net cash paid for acquisitions $ 52,609 $ 239,508
Schedule Of Acquisitions By Region	The following table summarizes the Company’s other acquisitions by region and period: Three months ended Year ended March 30, 2024 December 30, 2023 West* 1 3 East* — 1 Cement* — — _______________________________________________________________________
Schedule of Goodwill by Reportable Segment and in Total	Changes in the carrying amount of goodwill, by reportable segment, from December 30, 2023 to March 30, 2024 are summarized as follows: West East Cement Total Balance—December 30, 2023 $ 659,704 $ 361,501 $ 204,656 $ 1,225,861 Acquisitions (1) 36,101 — 768,946 805,047 Dispositions (2) — (37,938) — (37,938) Foreign currency translation adjustments (1,488) — — (1,488) Balance—March 30, 2024 $ 694,317 $ 323,563 $ 973,602 $ 1,991,482 _______________________________________________________________________ (1) Reflects goodwill from 2024 acquisitions and working capital adjustments from prior year acquisitions. (2) Reflects goodwill derecognition from dispositions completed during 2024.
Schedule of Intangible Assets by Type and in Total	The following table shows intangible assets by type and in total: March 30, 2024 December 30, 2023 Gross Accumulated Net Gross Accumulated Net Operating permits $ 38,677 $ (6,089) $ 32,588 $ 38,677 $ (5,691) $ 32,986 Mineral leases 17,375 (7,498) 9,877 17,778 (7,676) 10,102 Reserve rights 25,586 (5,226) 20,360 25,586 (5,020) 20,566 Intellectual property 21,400 (2,339) 19,061 — — — Other 104,884 (7,183) 97,701 5,012 (585) 4,427 Total intangible assets $ 207,922 $ (28,335) $ 179,587 $ 87,053 $ (18,972) $ 68,081
Schedule of Estimated Amortization Expense for Intangible Assets	The estimated amortization expense for the intangible assets for each of the five years subsequent to March 30, 2024 is as follows: 2024 (nine months) $ 33,705 2025 44,713 2026 34,345 2027 6,629 2028 5,707 2029 4,999 Thereafter 49,489 Total $ 179,587

REVENUE RECOGNITION (Tables)

REVENUE RECOGNITION (Tables)	3 Months Ended
	Mar. 30, 2024
Revenue from External Customer [Line Items]
Schedule of Revenue by Product	Revenue by product for the three months ended March 30, 2024 and April 1, 2023 is as follows: Three months ended March 30, 2024 April 1, 2023 Revenue by product*: Aggregates $ 145,511 $ 143,653 Cement 224,097 49,013 Ready-mix concrete 312,047 138,778 Asphalt 27,985 26,635 Paving and related services 40,922 27,184 Other 54,453 50,125 Total revenue $ 805,015 $ 435,388 *Revenue from liquid asphalt terminals is included in asphalt revenue.
Schedule of Accounts Receivable, Net	Accounts receivable, net consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Trade accounts receivable $ 441,049 $ 228,697 Construction contract receivables 15,110 51,567 Retention receivables 10,649 13,541 Receivables from related parties 518 — Accounts receivable 467,326 293,805 Less: Allowance for doubtful accounts (12,676) (6,553) Accounts receivable, net $ 454,650 $ 287,252
Summit Materials, LLC
Revenue from External Customer [Line Items]
Schedule of Revenue by Product	Revenue by product for the three months ended March 30, 2024 and April 1, 2023 is as follows: Three months ended March 30, 2024 April 1, 2023 Revenue by product*: Aggregates $ 145,511 $ 143,653 Cement 224,097 49,013 Ready-mix concrete 312,047 138,778 Asphalt 27,985 26,635 Paving and related services 40,922 27,184 Other 54,453 50,125 Total revenue $ 805,015 $ 435,388 *Revenue from liquid asphalt terminals is included in asphalt revenue.
Schedule of Accounts Receivable, Net	Accounts receivable, net consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Trade accounts receivable $ 441,198 $ 228,697 Construction contract receivables 15,110 51,567 Retention receivables 10,649 13,541 Receivables from related parties 518 — Accounts receivable 467,475 293,805 Less: Allowance for doubtful accounts (12,676) (6,553) Accounts receivable, net $ 454,799 $ 287,252

INVENTORIES (Tables)

INVENTORIES (Tables)	3 Months Ended
	Mar. 30, 2024
Inventory [Line Items]
Schedule of Components of Inventories	Inventories consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Aggregate stockpiles $ 172,593 $ 165,272 Finished goods 85,921 43,122 Work in process 22,507 10,702 Raw materials 57,480 22,254 Total $ 338,501 $ 241,350
Summit Materials, LLC
Inventory [Line Items]
Schedule of Components of Inventories	Inventories consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Aggregate stockpiles $ 172,593 $ 165,272 Finished goods 85,921 43,122 Work in process 22,507 10,702 Raw materials 57,480 22,254 Total $ 338,501 $ 241,350

ACCRUED EXPENSES (Tables)

ACCRUED EXPENSES (Tables)	3 Months Ended
	Mar. 30, 2024
Schedule Of Accrued Expenses [Line Items]
Schedule of Components of Accrued Expenses	Accrued expenses consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Interest $ 43,210 $ 27,593 Payroll and benefits 29,616 63,888 Finance lease obligations 4,698 4,020 Insurance 34,653 25,277 Current portion of accrued taxes and TRA liability 23,317 11,042 Deferred asset purchase payments 7,269 5,903 Professional fees 6,580 2,036 Other (1) 42,433 31,932 Total $ 191,776 $ 171,691 (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 March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Interest $ 43,210 $ 27,593 Payroll and benefits 29,616 63,888 Finance lease obligations 4,698 4,020 Insurance 34,653 25,277 Accrued taxes 21,475 12,285 Deferred asset purchase payments 7,269 5,903 Professional fees 6,580 2,036 Other (1) 42,433 31,932 Total $ 189,934 $ 172,934 _______________________________________________________________________ (1) Consists primarily of current portion of asset retirement obligations and miscellaneous accruals.

DEBT (Tables)

DEBT (Tables)	3 Months Ended
	Mar. 30, 2024
Debt Instrument [Line Items]
Schedule of Debt	Debt consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Term Loan, due 2029: $1,010.0 million and $504.5 million, net of $2.4 million and $4.0 million discount at March 30, 2024 and December 30, 2023, respectively $ 1,007,601 $ 500,473 6 1 ⁄ 2 % Senior Notes, due 2027 300,000 300,000 5 1 ⁄ 4 % Senior Notes, due 2029 700,000 700,000 7 1 ⁄ 4 % Senior Notes, due 2031 800,000 800,000 Total 2,807,601 2,300,473 Current portion of long-term debt 7,575 3,822 Long-term debt $ 2,800,026 $ 2,296,651
Schedule of Contractual Payments of Long-Term Debt	The contractual payments of long-term debt, including current maturities, for the five years subsequent to March 30, 2024, are as follows: 2024 (nine months) $ 5,050 2025 12,625 2026 10,100 2027 310,100 2028 10,100 2029 1,662,025 Thereafter 800,000 Total 2,810,000 Less: Original issue net discount (2,399) Less: Deferred financing costs (27,317) Total debt $ 2,780,284
Shedule of Activity for Deferred Financing Fees	The following table presents the activity for the deferred financing fees for the three months ended March 30, 2024 and April 1, 2023: Deferred financing fees Balance—December 30, 2023 $ 14,463 Loan origination fees 17,550 Amortization (1,550) Write off of deferred financing fees (1,462) Balance—March 30, 2024 $ 29,001 Balance—December 31, 2022 $ 11,489 Loan origination fees 1,566 Amortization (616) Write off of deferred financing fees (160) Balance—April 1, 2023 $ 12,279
Summit Materials, LLC
Debt Instrument [Line Items]
Schedule of Debt	Debt consisted of the following as of March 30, 2024 and December 30, 2023: March 30, 2024 December 30, 2023 Term Loan, due 2029: $1,010.0 million and $504.5 million, net of $2.4 million and $4.0 million discount at March 30, 2024 and December 30, 2023, respectively $ 1,007,601 $ 500,473 6 1/2 % Senior Notes, due 2027 300,000 300,000 5 1/4 % Senior Notes, due 2029 700,000 700,000 7 1 ⁄ 4 % Senior Notes, due 2031 800,000 800,000 Total 2,807,601 2,300,473 Current portion of long-term debt 7,575 3,822 Long-term debt $ 2,800,026 $ 2,296,651
Schedule of Contractual Payments of Long-Term Debt	The contractual payments of long-term debt, including current maturities, for the five years subsequent to March 30, 2024, are as follows: 2024 (nine months) $ 5,050 2025 12,625 2026 10,100 2027 310,100 2028 10,100 2029 1,662,025 Thereafter 800,000 Total 2,810,000 Less: Original issue net discount (2,399) Less: Deferred financing costs (27,317) Total debt $ 2,780,284
Shedule of Activity for Deferred Financing Fees	The following table presents the activity for the deferred financing fees for the three months ended March 30, 2024 and April 1, 2023: Deferred financing fees Balance—December 30, 2023 $ 14,463 Loan origination fees 17,550 Amortization (1,550) Write off of deferred financing fees (1,462) Balance—March 30, 2024 $ 29,001 Balance—December 31, 2022 $ 11,489 Loan origination fees 1,566 Amortization (616) Write off of deferred financing fees (160) Balance—April 1, 2023 $ 12,279

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 30, 2024
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 March 30, 2024 April 1, 2023 Net loss attributable to Summit Inc. $ (66,866) $ (30,804) Weighted average shares of Class A stock outstanding 167,446,041 118,564,556 Add: Nonvested restricted stock awards of retirement eligible shares 65,534 115,100 Weighted average shares outstanding 167,511,575 118,679,656 Basic loss per share $ (0.40) $ (0.26) Diluted net loss attributable to Summit Inc. $ (66,866) $ (30,804) Weighted average shares outstanding 167,511,575 118,679,656 Add: weighted average of LP Units — — Add: stock options — — Add: warrants — — Add: restricted stock units — — Add: performance stock units — — Weighted average dilutive shares outstanding 167,511,575 118,679,656 Diluted loss per share $ (0.40) $ (0.26)
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 March 30, 2024 April 1, 2023 Antidilutive shares: LP Units 511,565 1,311,257 Time-vesting stock options 239,429 279,680 Warrants 31,519 31,519 Time-vesting restricted stock units 1,186,426 1,051,844 Market-based restricted stock units 550,165 439,704

STOCKHOLDERS' EQUITY_MEMBERS'_2

STOCKHOLDERS' EQUITY/MEMBERS' INTEREST (Tables)	3 Months Ended
	Mar. 30, 2024
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 30, 2023 119,529,380 763,243 120,292,623 99.4 % Exchanges during period 763,243 (763,243) — Stock option exercises 29,216 — 29,216 Issuance of Class A common stock 54,720,000 — 54,720,000 Other equity transactions 412,411 — 412,411 Balance — March 30, 2024 175,454,250 — 175,454,250 100.0 % Balance — December 31, 2022 118,408,655 1,312,004 119,720,659 98.9 % Exchanges during period 2,000 (2,000) — Stock option exercises 902 — 902 Other equity transactions 407,114 — 407,114 Balance — April 1, 2023 118,818,671 1,310,004 120,128,675 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 30, 2023 $ 6,840 $ 435 $ 7,275 Foreign currency translation adjustment, net of tax — (3,585) (3,585) Balance — March 30, 2024 $ 6,840 $ (3,150) $ 3,690 Balance — December 31, 2022 $ 6,356 $ (3,272) $ 3,084 Foreign currency translation adjustment, net of tax — 161 161 Balance — April 1, 2023 $ 6,356 $ (3,111) $ 3,245
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 30, 2023 $ (120) $ (15,689) $ (15,809) Foreign currency translation adjustment — (4,724) (4,724) Balance — March 30, 2024 $ (120) $ (20,413) $ (20,533) Balance — December 31, 2022 $ (762) $ (20,614) $ (21,376) Foreign currency translation adjustment — 203 203 Balance — April 1, 2023 $ (762) $ (20,411) $ (21,173)

SUPPLEMENTAL CASH FLOW INFORM_2

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)	3 Months Ended
	Mar. 30, 2024
Schedule Of Cash Flow Supplemental [Line Items]
Schedule of Supplemental Cash Flow Information	Supplemental cash flow information is as follows: Three months ended March 30, 2024 April 1, 2023 Cash payments: Interest $ 32,422 $ 37,970 Payments for income taxes, net 2,623 2,088 Operating cash payments on operating leases 4,846 2,402 Operating cash payments on finance leases 694 149 Finance cash payments on finance leases 1,572 4,011 Non cash investing and financing activities: Accrued liabilities for purchases of property, plant and equipment $ 29,281 $ 21,911 Right of use assets obtained in exchange for operating lease obligations 62,305 679 Right of use assets obtained in exchange for finance leases obligations 26,235 413 Exchange of LP Units to shares of Class A common stock 32,633 60 Issuance of Class A common stock 1,973,750 —
Summit Materials, LLC
Schedule Of Cash Flow Supplemental [Line Items]
Schedule of Supplemental Cash Flow Information	Supplemental cash flow information is as follows: Three months ended March 30, 2024 April 1, 2023 Cash payments: Interest $ 32,422 $ 37,970 Payments for income taxes, net 2,623 2,088 Operating cash payments on operating leases 4,846 2,402 Operating cash payments on finance leases 694 149 Finance cash payments on finance leases 1,572 4,011 Non cash investing and financing activities: Accrued liabilities for purchases of property, plant and equipment $ 29,281 $ 21,911 Right of use assets obtained in exchange for operating lease obligations 62,305 679 Right of use assets obtained in exchange for finance leases obligations 26,235 413

LEASES (Tables)

LEASES (Tables)	3 Months Ended
	Mar. 30, 2024
Lessee, Lease, Description [Line Items]
Schedule of Lease Cost	The components of lease expense were as follows: Three months ended March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887
Schedule of Lease Assets and Liabilities	The components of lease expense were as follows: Three months ended March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887
Schedule of Finance Lease Liability Maturities	The components of lease expense were as follows: Three months ended March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887
Schedule of Operating Lease Liability Maturities	The components of lease expense were as follows: Three months ended March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887
Summit Materials, LLC
Lessee, Lease, Description [Line Items]
Schedule of Lease Cost	The components of lease expense were as follows: Three months ended March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887
Schedule of Lease Assets and Liabilities	The components of lease expense were as follows: Three months ended March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887
Schedule of Finance Lease Liability Maturities	The components of lease expense were as follows: Three months ended March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887
Schedule of Operating Lease Liability Maturities	The components of lease expense were as follows: Three months ended March 30, 2024 April 1, 2023 Operating lease cost $ 6,029 $ 2,641 Variable lease cost 1,665 30 Short-term lease cost 9,322 7,270 Financing lease cost: Amortization of right-of-use assets 1,459 818 Interest on lease liabilities 645 148 Total lease cost $ 19,120 $ 10,907 March 30, 2024 December 30, 2023 Supplemental balance sheet information related to leases: Operating leases: Operating lease right-of-use assets $ 89,251 $ 36,553 Current operating lease liabilities $ 16,745 $ 8,596 Noncurrent operating lease liabilities 78,618 33,230 Total operating lease liabilities $ 95,363 $ 41,826 Finance leases: Property and equipment, gross $ 53,619 $ 30,136 Less accumulated depreciation (11,715) (12,088) Property and equipment, net $ 41,904 $ 18,048 Current finance lease liabilities $ 4,698 $ 4,020 Long-term finance lease liabilities 32,189 14,357 Total finance lease liabilities $ 36,887 $ 18,377 Weighted average remaining lease term (years): Operating leases 7.7 8.4 Finance lease 10.6 6.0 Weighted average discount rate: Operating leases 7.1 % 5.1 % Finance leases 8.1 % 7.7 % Maturities of lease liabilities, as of March 30, 2024, were as follows: Operating Leases Finance Leases 2024 (nine months) $ 17,288 $ 5,734 2025 20,808 6,570 2026 17,554 5,072 2027 14,089 4,870 2028 10,906 4,627 2029 9,407 4,477 Thereafter 33,031 24,743 Total lease payments 123,083 56,093 Less imputed interest (27,720) (19,206) Present value of lease payments $ 95,363 $ 36,887

FAIR VALUE (Tables)

FAIR VALUE (Tables)	3 Months Ended
	Mar. 30, 2024
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 March 30, 2024 and December 30, 2023 was: March 30, 2024 December 30, 2023 Current portion of acquisition-related liabilities and Accrued expenses: Contingent consideration $ 1,701 $ 139 Acquisition-related liabilities and Other noncurrent liabilities: Contingent consideration $ 7,727 $ 9,254
Schedule of Carrying Value and Fair Value of Financial Instruments	The carrying value and fair value of these financial instruments as of March 30, 2024 and December 30, 2023 was: March 30, 2024 December 30, 2023 Fair Value Carrying Value Fair Value Carrying Value Level 1 Long-term debt(1) $ 2,826,313 $ 2,807,601 $ 2,329,606 $ 2,300,473 Level 3 Current portion of deferred consideration and noncompete obligations(2) 7,292 7,292 6,868 6,868 Long term portion of deferred consideration and noncompete obligations(3) 12,928 12,928 18,767 18,767 (1) $7.6 million and $3.8 million was included in current portion of debt as of March 30, 2024 and December 30, 2023, 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 March 30, 2024 and December 30, 2023 was: March 30, 2024 December 30, 2023 Current portion of acquisition-related liabilities and Accrued expenses: Contingent consideration $ 1,701 $ 139 Acquisition-related liabilities and Other noncurrent liabilities: Contingent consideration $ 7,727 $ 9,254
Schedule of Carrying Value and Fair Value of Financial Instruments	The carrying value and fair value of these financial instruments as of March 30, 2024 and December 30, 2023 was: March 30, 2024 December 30, 2023 Fair Value Carrying Value Fair Value Carrying Value Level 1 Long-term debt(1) $ 2,826,313 $ 2,807,601 $ 2,329,606 $ 2,300,473 Level 3 Current portion of deferred consideration and noncompete obligations(2) 7,292 7,292 6,868 6,868 Long term portion of deferred consideration and noncompete obligations(3) 12,928 12,928 18,767 18,767 (1) $7.6 million and $3.8 million was included in current portion of debt as of March 30, 2024 and December 30, 2023, 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)	3 Months Ended
	Mar. 30, 2024
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 March 30, 2024 and December 30, 2023 and for the three months ended March 30, 2024 and April 1, 2023: Three months ended March 30, 2024 April 1, 2023 Revenue*: West $ 304,538 $ 250,882 East 268,694 130,389 Cement 231,783 54,117 Total revenue $ 805,015 $ 435,388 *Intercompany sales are immaterial and the presentation above only reflects sales to external customers. Three months ended March 30, 2024 April 1, 2023 Loss from operations before taxes $ (78,335) $ (37,678) Interest expense 51,892 27,420 Depreciation, depletion and amortization 94,963 50,188 Accretion 1,008 706 Loss on debt financings 5,453 493 Gain on sale of businesses (14,985) — Non-cash compensation 6,720 4,708 Argos USA acquisition and integration costs 61,294 — Other (6,785) (4,636) Total Adjusted EBITDA $ 121,225 $ 41,201 Total Adjusted EBITDA by Segment: West $ 43,400 $ 32,678 East 37,476 18,852 Cement 59,454 10 Corporate and other (19,105) (10,339) Total Adjusted EBITDA $ 121,225 $ 41,201 Three months ended March 30, 2024 April 1, 2023 Purchases of property, plant and equipment West $ 25,844 $ 38,174 East 16,224 15,518 Cement 12,036 6,996 Total reportable segments 54,104 60,688 Corporate and other 4,415 2,896 Total purchases of property, plant and equipment $ 58,519 $ 63,584 Three months ended March 30, 2024 April 1, 2023 Depreciation, depletion, amortization and accretion: West $ 30,338 $ 26,373 East 23,081 15,535 Cement 40,705 7,998 Total reportable segments 94,124 49,906 Corporate and other 1,847 988 Total depreciation, depletion, amortization and accretion $ 95,971 $ 50,894 March 30, 2024 December 30, 2023 Total assets: West $ 1,970,633 $ 1,837,214 East 1,608,962 1,171,944 Cement 4,032,512 904,508 Total reportable segments 7,612,107 3,913,666 Corporate and other 517,793 1,235,916 Total $ 8,129,900 $ 5,149,582
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 March 30, 2024 and December 30, 2023 and for the three months ended March 30, 2024 and April 1, 2023: Three months ended March 30, 2024 April 1, 2023 Revenue*: West $ 304,538 $ 250,882 East 268,694 130,389 Cement 231,783 54,117 Total revenue $ 805,015 $ 435,388 *Intercompany sales are immaterial and the presentation above only reflects sales to external customers. Three months ended March 30, 2024 April 1, 2023 Loss from operations before taxes $ (78,526) $ (37,678) Interest expense 51,892 27,420 Depreciation, depletion and amortization 94,963 50,188 Accretion 1,008 706 Loss on debt financings 5,453 493 Gain on sale of businesses (14,985) — Non-cash compensation 6,720 4,708 Argos USA acquisition and integration costs 61,294 — Other (6,594) (4,636) Total Adjusted EBITDA $ 121,225 $ 41,201 Total Adjusted EBITDA by Segment: West $ 43,400 $ 32,678 East 37,476 18,852 Cement 59,454 10 Corporate and other (19,105) (10,339) Total Adjusted EBITDA $ 121,225 $ 41,201 Three months ended March 30, 2024 April 1, 2023 Purchases of property, plant and equipment West $ 25,844 $ 38,174 East 16,224 15,518 Cement 12,036 6,996 Total reportable segments 54,104 60,688 Corporate and other 4,415 2,896 Total purchases of property, plant and equipment $ 58,519 $ 63,584 Three months ended March 30, 2024 April 1, 2023 Depreciation, depletion, amortization and accretion: West $ 30,338 $ 26,373 East 23,081 15,535 Cement 40,705 7,998 Total reportable segments 94,124 49,906 Corporate and other 1,847 988 Total depreciation, depletion, amortization and accretion $ 95,971 $ 50,894 March 30, 2024 December 30, 2023 Total assets: West $ 1,970,633 $ 1,837,214 East 1,608,962 1,171,944 Cement 4,032,512 904,508 Total reportable segments 7,612,107 3,913,666 Corporate and other 633,171 1,298,863 Total $ 8,245,278 $ 5,212,529

GUARANTOR AND NON-GUARANTOR F_2

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Tables) - Summit Materials, LLC	3 Months Ended
	Mar. 30, 2024
Schedule of Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheets March 30, 2024 Non- Issuers Guarantors Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 444,621 $ 3,035 $ 41,760 $ (3,208) $ 486,208 Accounts receivable, net 1,723 433,440 19,613 23 454,799 Intercompany receivables 2,962,527 2,333,674 — (5,296,201) — Cost and estimated earnings in excess of billings — 10,722 959 — 11,681 Inventories — 330,727 7,774 — 338,501 Other current assets 6,675 36,480 2,364 — 45,519 Total current assets 3,415,546 3,148,078 72,470 (5,299,386) 1,336,708 Property, plant and equipment, net 43,770 4,292,849 80,736 — 4,417,355 Goodwill — 1,934,795 56,687 — 1,991,482 Intangible assets, net — 175,298 4,289 — 179,587 Operating lease right-of-use assets 8,539 76,672 4,040 — 89,251 Other assets 5,391,496 280,725 1,017 (5,442,343) 230,895 Total assets $ 8,859,351 $ 9,908,417 $ 219,239 $ (10,741,729) $ 8,245,278 Liabilities and Members' Interest Current liabilities: Current portion of debt $ 7,575 $ — $ — $ — $ 7,575 Current portion of acquisition-related liabilities — 8,993 — — 8,993 Accounts payable 33,255 249,732 8,053 (126) 290,914 Accrued expenses 100,272 90,021 2,849 (3,208) 189,934 Current operating lease liabilities 1,329 14,862 554 — 16,745 Intercompany payables 1,418,021 3,876,327 1,704 (5,296,052) — Billings in excess of costs and estimated earnings — 5,495 510 — 6,005 Total current liabilities 1,560,452 4,245,430 13,670 (5,299,386) 520,166 Long-term debt 2,772,709 — — — 2,772,709 Acquisition-related liabilities — 20,655 — — 20,655 Noncurrent operating lease liabilities 12,163 63,140 3,315 — 78,618 Other noncurrent liabilities 270,274 318,398 119,290 (98,585) 609,377 Total liabilities 4,615,598 4,647,623 136,275 (5,397,971) 4,001,525 Total members' interest 4,243,753 5,260,794 82,964 (5,343,758) 4,243,753 Total liabilities and members' interest $ 8,859,351 $ 9,908,417 $ 219,239 $ (10,741,729) $ 8,245,278 Condensed Consolidating Balance Sheets December 30, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 310,410 $ 3,115 $ 44,899 $ (2,755) $ 355,669 Restricted cash 800,000 — — — 800,000 Accounts receivable, net 6,441 255,836 24,998 (23) 287,252 Intercompany receivables 1,087,570 2,331,879 — (3,419,449) — Cost and estimated earnings in excess of billings — 9,228 1,061 — 10,289 Inventories — 234,738 6,612 — 241,350 Other current assets 11,480 13,264 645 — 25,389 Total current assets 2,215,901 2,848,060 78,215 (3,422,227) 1,719,949 Property, plant and equipment, net 35,812 1,858,020 82,988 — 1,976,820 Goodwill — 1,167,685 58,176 — 1,225,861 Intangible assets, net — 63,655 4,426 — 68,081 Operating lease right-of-use assets 3,749 28,511 4,293 — 36,553 Other assets 5,384,259 235,719 933 (5,435,646) 185,265 Total assets $ 7,639,721 $ 6,201,650 $ 229,031 $ (8,857,873) $ 5,212,529 Liabilities and Members' Interest Current liabilities: Current portion of debt $ 3,822 $ — $ — $ — $ 3,822 Current portion of acquisition-related liabilities — 7,007 — — 7,007 Accounts payable 4,290 111,061 8,293 (23) 123,621 Accrued expenses 88,318 82,065 5,306 (2,755) 172,934 Current operating lease liabilities 804 7,230 562 — 8,596 Intercompany payables 2,890,124 525,230 4,095 (3,419,449) — Billings in excess of costs and estimated earnings — 7,280 948 — 8,228 Total current liabilities 2,987,358 739,873 19,204 (3,422,227) 324,208 Long-term debt 2,283,639 — — — 2,283,639 Acquisition-related liabilities — 28,021 — — 28,021 Noncurrent operating lease liabilities 7,951 21,587 3,692 — 33,230 Other noncurrent liabilities 5,768 196,759 119,820 (133,921) 188,426 Total liabilities 5,284,716 986,240 142,716 (3,556,148) 2,857,524 Total members' interest 2,355,005 5,215,410 86,315 (5,301,725) 2,355,005 Total liabilities and members' interest $ 7,639,721 $ 6,201,650 $ 229,031 $ (8,857,873) $ 5,212,529
Schedule of Pro Forma Condensed Combined Statement of Operations	Condensed Consolidating Statements of Operations For the three months ended March 30, 2024 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 823,366 $ 22,140 $ (40,491) $ 805,015 Cost of revenue (excluding items shown separately below) — 649,602 14,900 (40,491) 624,011 General and administrative expenses 49,110 79,117 1,659 — 129,886 Depreciation, depletion, amortization and accretion 1,846 91,191 2,934 — 95,971 Operating (loss) income (50,956) 3,456 2,647 — (44,853) Other income, net (44,353) (1,383) (608) 43,110 (3,234) Interest expense (income) 70,951 (20,431) 1,372 — 51,892 Gain on sale of business — (14,985) — — (14,985) (Loss) income from operation before taxes (77,554) 40,255 1,883 (43,110) (78,526) Income tax expense (benefit) 776 (1,482) 510 — (196) Net (loss) income attributable to Summit LLC $ (78,330) $ 41,737 $ 1,373 $ (43,110) $ (78,330) Comprehensive (loss) income attributable to member of Summit Materials, LLC $ (83,054) $ 41,737 $ 6,097 $ (47,834) $ (83,054) Condensed Consolidating Statements of Operations For the three months ended April 1, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Revenue $ — $ 408,422 $ 27,761 $ (795) $ 435,388 Cost of revenue (excluding items shown separately below) — 335,210 19,622 (795) 354,037 General and administrative expenses 15,221 28,947 1,764 — 45,932 Depreciation, depletion, amortization and accretion 988 47,153 2,753 — 50,894 Operating (loss) income (16,209) (2,888) 3,622 — (15,475) Other income, net (19,147) (277) (508) 14,715 (5,217) Interest expense (income) 39,845 (13,795) 1,370 — 27,420 Loss on sale of business — — — — — (Loss) income from operation before taxes (36,907) 11,184 2,760 (14,715) (37,678) Income tax expense (benefit) 304 (1,510) 739 — (467) Net (loss) income attributable to Summit LLC $ (37,211) $ 12,694 $ 2,021 $ (14,715) $ (37,211) Comprehensive (loss) income attributable to member of Summit Materials, LLC $ (37,008) $ 12,694 $ 1,818 $ (14,512) $ (37,008)
Schedule of Condensed Consolidating Statements of Cash Flows	Condensed Consolidating Statements of Cash Flows For the three months ended March 30, 2024 Non- Issuers Guarantors Guarantors Eliminations Consolidated Net cash (used in) provided by operating activities $ (22,707) $ (14,571) $ 3,773 $ — $ (33,505) Cash flow from investing activities: Acquisitions, net of cash acquired 97,153 (1,198,072) — — (1,100,919) Purchase of property, plant and equipment (4,415) (52,077) (2,027) — (58,519) Proceeds from the sale of property, plant, and equipment — 2,662 2 — 2,664 Proceeds from the sale of a business — 75,993 — — 75,993 Other — (22,640) — — (22,640) Net cash provided by (used in) investing activities 92,738 (1,194,134) (2,025) — (1,103,421) Cash flow from financing activities: Capital distributions to member (52,015) 52,608 — — 593 Net proceeds from debt issuance 1,007,475 — — — 1,007,475 Loans received from and payments made on loans from other Summit Companies (1,161,406) 1,165,362 (3,503) (453) — Payments on long-term debt (504,464) (1,928) — — (506,392) Payments on acquisition-related liabilities — (6,124) — — (6,124) Debt issuance costs (17,550) — — — (17,550) Other (7,860) (1,293) (256) — (9,409) Net cash (used in) provided by financing activities (735,820) 1,208,625 (3,759) (453) 468,593 Impact of cash on foreign currency — — (1,128) — (1,128) Net increase (decrease) in cash and cash equivalents and restricted cash (665,789) (80) (3,139) (453) (669,461) Cash and cash equivalents and restricted cash—beginning of period 1,110,410 3,115 44,899 (2,755) 1,155,669 Cash and cash equivalents and restricted cash—end of period $ 444,621 $ 3,035 $ 41,760 $ (3,208) $ 486,208 Condensed Consolidating Statements of Cash Flows For the three months ended April 1, 2023 Non- Issuers Guarantors Guarantors Eliminations Consolidated Net cash (used in) provided by operating activities $ (55,528) $ 49,394 $ 6,469 $ — $ 335 Cash flow from investing activities: Acquisitions, net of cash acquired — (55,477) — — (55,477) Purchase of property, plant and equipment (2,895) (58,356) (2,333) — (63,584) Proceeds from the sale of property, plant, and equipment — 1,777 — — 1,777 Other — (1,045) — — (1,045) Net cash used in investing activities (2,895) (113,101) (2,333) — (118,329) Cash flow from financing activities: Capital distributions to member (55,870) 55,885 — — 15 Loans received from and payments made on loans from other Summit Companies (25,853) 24,951 (2,646) 3,548 — Payments on long-term debt (1,274) (3,140) — — (4,414) Payments on acquisition-related liabilities — (11,374) — — (11,374) Debt issuance costs (1,566) — — — (1,566) Other (2,740) (2,766) (213) — (5,719) Net cash (used in) provided by financing activities (87,303) 63,556 (2,859) 3,548 (23,058) Impact of cash on foreign currency — — 58 — 58 Net increase (decrease) in cash and cash equivalents (145,726) (151) 1,335 3,548 (140,994) Cash and cash equivalents—beginning of period 498,307 2,864 26,298 (7,018) 520,451 Cash and cash equivalents—end of period $ 352,581 $ 2,713 $ 27,633 $ (3,470) $ 379,457

SUMMARY OF ORGANIZATION AND S_3

SUMMARY OF ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands		3 Months Ended
	Jan. 12, 2024 USD ($) shares	Mar. 30, 2024 USD ($) state cementPlant segment	Apr. 01, 2023 USD ($)	Dec. 30, 2023 USD ($)
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Number of operating segments | segment		3
Number of reportable segments | segment		3
Proceeds from debt issuances		$ 1,007,475	$ 0
Number of states in which the entity operates | state		24
Transaction and integration costs		$ 62,208	364
Deferred tax liabilities		$ 205,669		$ 15,854
Argos USA
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Cash consideration	$ 1,200,000
Net cash paid for acquisitions	3,119,213
Argos USA | Seven Point Two Five Percent Senior Notes Due Two Thousand Thirty One | Senior Notes
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Proceeds from debt issuances	$ 800,000
Argos USA | Preferred Stock
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Business acquisition number of shares (in shares) | shares	1
Argos USA | Common Class A
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Business acquisition number of shares (in shares) | shares	54,720,000
Revision of Prior Period, Reclassification, Adjustment
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Transaction and integration costs			400
Deferred tax liabilities				15,900
Cement plant
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Number of plants | cementPlant		6
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
Proceeds from debt issuances		$ 1,007,475	0
Number of states in which the entity operates | state		24
Transaction and integration costs		$ 62,208	$ 364
Deferred tax liabilities		$ 342,040		$ 100,812
Summit Materials, LLC | Argos USA
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Cash consideration	$ 1,200,000
Net cash paid for acquisitions	3,119,213
Summit Materials, LLC | Argos USA | Seven Point Two Five Percent Senior Notes Due Two Thousand Thirty One | Senior Notes
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Proceeds from debt issuances	$ 800,000
Summit Materials, LLC | Argos USA | Preferred Stock
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Business acquisition number of shares (in shares) | shares	1
Summit Materials, LLC | Argos USA | Common Class A
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Business acquisition number of shares (in shares) | shares	54,720,000
Summit Materials, LLC | Cement plant
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]
Number of plants | cementPlant		6

ACQUISITIONS, DISPOSTIONS, GO_3

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Narrative (Details) $ / shares in Units, T in Millions		3 Months Ended
	Jan. 12, 2024 USD ($) T ready-mixPlant integratedCementPlant grindingFacility port inlandTerminal $ / shares shares	Mar. 31, 2024 USD ($)	Mar. 30, 2024 USD ($) business $ / shares	Mar. 30, 2024 USD ($) $ / shares	Apr. 01, 2023 USD ($)	Dec. 30, 2023 $ / shares
Business Acquisition [Line Items]
Preferred stock, par value (in usd per share) | $ / shares			$ 0.01	$ 0.01		$ 0.01
Argos USA acquisition and integration costs			$ 61,294,000		$ 0
Amortization expense			9,200,000		900,000
Proceeds from sale of businesses			75,993,000		0
Gain on sale of business			$ 14,985,000		0
East
Business Acquisition [Line Items]
Number of businesses sold | business			2
Proceeds from sale of businesses			$ 76,000,000
Gain on sale of business			15,000,000
Summit Materials, LLC
Business Acquisition [Line Items]
Argos USA acquisition and integration costs			61,294,000		0
Amortization expense			9,200,000		900,000
Proceeds from sale of businesses			75,993,000		0
Gain on sale of business			$ 14,985,000		$ 0
Summit Materials, LLC | East
Business Acquisition [Line Items]
Number of businesses sold | business			2
Proceeds from sale of businesses			$ 76,000,000
Gain on sale of business			$ 15,000,000
Argos USA
Business Acquisition [Line Items]
Purchase Price	$ 3,119,213,000
Cash consideration	$ 1,200,000,000
Preferred stock, par value (in usd per share) | $ / shares	$ 0.01
Number of integrated cement plants | integratedCementPlant	4
Number of grinding facilities | grindingFacility	2
Number of ready-mix concrete plants | ready-mixPlant	140
Number of ports | port	8
Number of inland | inlandTerminal	10
Cement grinding capacity per annum | T	9.6
import capacity of cement per annum | T	5.4
Revenue of acquiree since acquisition date, actual		$ 352,400,000
Earnings or loss of acquiree since acquisition date, actual		$ 18,900,000
Percentage of voting interests acquired	25.01%
Intangible assets, net	$ 100,000,000
Argos USA | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets, net	$ 85,000,000
Weighted average useful life	3 years
Argos USA | Contractual Intangible Assets
Business Acquisition [Line Items]
Intangible assets, net	$ 15,000,000
Weighted average useful life	8 years
Argos USA | Intellectual Property Licenses
Business Acquisition [Line Items]
Intangible assets, net	$ 21,400,000
Argos USA | Preferred Stock
Business Acquisition [Line Items]
Business acquisition number of shares (in shares) | shares	1
Argos USA | Common Class A
Business Acquisition [Line Items]
Business acquisition number of shares (in shares) | shares	54,720,000
Share price (in usd per share) | $ / shares	$ 36.07
Argos USA | Summit Materials, LLC
Business Acquisition [Line Items]
Purchase Price	$ 3,119,213,000
Cash consideration	$ 1,200,000,000
Preferred stock, par value (in usd per share) | $ / shares	$ 0.01
Number of integrated cement plants | integratedCementPlant	4
Number of grinding facilities | grindingFacility	2
Number of ready-mix concrete plants | ready-mixPlant	140
Number of ports | port	8
Number of inland | inlandTerminal	10
Cement grinding capacity per annum | T	9.6
import capacity of cement per annum | T	5.4
Revenue of acquiree since acquisition date, actual				$ 352,400,000
Earnings or loss of acquiree since acquisition date, actual				$ 18,900,000
Percentage of voting interests acquired	25.01%
Intangible assets, net	$ 100,000,000
Argos USA | Summit Materials, LLC | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets, net	$ 85,000,000
Weighted average useful life	3 years
Argos USA | Summit Materials, LLC | Contractual Intangible Assets
Business Acquisition [Line Items]
Intangible assets, net	$ 15,000,000
Weighted average useful life	8 years
Argos USA | Summit Materials, LLC | Intellectual Property Licenses
Business Acquisition [Line Items]
Intangible assets, net	$ 21,400,000
Argos USA | Summit Materials, LLC | Preferred Stock
Business Acquisition [Line Items]
Business acquisition number of shares (in shares) | shares	1
Argos USA | Summit Materials, LLC | Common Class A
Business Acquisition [Line Items]
Business acquisition number of shares (in shares) | shares	54,720,000
Share price (in usd per share) | $ / shares	$ 36.07

ACQUISITIONS, DISPOSTIONS, GO_4

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Pro forma Revenue and Net Income (Details) - Argos USA - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Business Acquisition [Line Items]
Total Revenues	$ 848,902	$ 835,396
Net income attributable to Summit Inc.	(66,269)	(35,844)
Summit Materials, LLC
Business Acquisition [Line Items]
Total Revenues	848,902	835,396
Net income attributable to Summit Inc.	$ (66,269)	$ (35,844)

ACQUISITIONS, DISPOSTIONS, GO_5

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Pro forma Preliminary Price Allocation (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 12, 2024	Mar. 30, 2024	Apr. 01, 2023
Business Acquisition [Line Items]
Cash consideration		$ 1,100,919	$ 55,477
Summit Materials, LLC
Business Acquisition [Line Items]
Cash consideration		$ 1,100,919	$ 55,477
Argos USA
Business Acquisition [Line Items]
Cash consideration	$ 1,145,463
Fair value of stock consideration issued	1,973,750
Total fair value of consideration transferred	3,119,213
Argos USA | Summit Materials, LLC
Business Acquisition [Line Items]
Cash consideration	1,145,463
Fair value of stock consideration issued	1,973,750
Total fair value of consideration transferred	$ 3,119,213

ACQUISITIONS, DISPOSTIONS, GO_6

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Fair Value of Assets Acquired And Liabilities Assumed (Details) - USD ($) $ in Thousands	Jan. 12, 2024	Mar. 30, 2024	Dec. 30, 2023
Business Acquisition [Line Items]
Goodwill		$ 1,990,482	$ 1,224,861
Summit Materials, LLC
Business Acquisition [Line Items]
Goodwill		$ 1,991,482	$ 1,225,861
Argos USA
Business Acquisition [Line Items]
Purchase Price	$ 3,119,213
Cash and cash equivalents	97,153
Accounts receivable, net	156,195
Inventories	95,448
Other current assets	18,178
Intangible assets, net	100,000
Property, plant and equipment	2,447,340
Operating lease right of use assets	55,756
Other assets	52,684
Accounts payable	(113,929)
Accrued expenses	(73,039)
Current operating lease liabilities	(7,545)
Noncurrent operating lease liabilities	(48,211)
Deferred tax liabilities	(263,530)
Other long-term liabilities	(166,233)
Net assets acquired	2,350,267
Goodwill	768,946
Argos USA | Summit Materials, LLC
Business Acquisition [Line Items]
Purchase Price	3,119,213
Cash and cash equivalents	97,153
Accounts receivable, net	156,195
Inventories	95,448
Other current assets	18,178
Intangible assets, net	100,000
Property, plant and equipment	2,447,340
Operating lease right of use assets	55,756
Other assets	52,684
Accounts payable	(113,929)
Accrued expenses	(73,039)
Current operating lease liabilities	(7,545)
Noncurrent operating lease liabilities	(48,211)
Deferred tax liabilities	(263,530)
Other long-term liabilities	(166,233)
Net assets acquired	2,350,267
Goodwill	$ 768,946

ACQUISITIONS, DISPOSTIONS, GO_7

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Acquisitions by Region (Details)	3 Months Ended	12 Months Ended
	Mar. 30, 2024 acquisition Segment	Dec. 30, 2023 acquisition
Argos USA
Business Acquisition [Line Items]
Number of segments affected by acquisition | Segment	3
Summit Materials, LLC | Argos USA
Business Acquisition [Line Items]
Number of segments affected by acquisition | Segment	3
West
Business Acquisition [Line Items]
Number of businesses acquired	1	3
Number of aggregate-based operations acquired	1
West | Summit Materials, LLC
Business Acquisition [Line Items]
Number of businesses acquired	1	3
Number of aggregate-based operations acquired	1
East
Business Acquisition [Line Items]
Number of businesses acquired	0	1
East | Summit Materials, LLC
Business Acquisition [Line Items]
Number of businesses acquired	0	1
Cement
Business Acquisition [Line Items]
Number of businesses acquired	0	0
Cement | Summit Materials, LLC
Business Acquisition [Line Items]
Number of businesses acquired	0	0

ACQUISITIONS, DISPOSTIONS, GO_8

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jan. 12, 2024	Mar. 30, 2024	Dec. 30, 2023
Business Acquisition [Line Items]
Goodwill		$ 1,990,482	$ 1,224,861
Summit Materials, LLC
Business Acquisition [Line Items]
Goodwill		1,991,482	1,225,861
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Financial assets		1,740	12,747
Inventories		161	6,251
Property, plant and equipment		15,170	125,207
Other assets		333	1,085
Financial liabilities		(903)	(11,973)
Other long-term liabilities		(407)	(802)
Net assets acquired		16,094	132,515
Goodwill		36,515	108,590
Purchase price		52,609	241,105
Other		0	(1,597)
Net cash paid for acquisitions		52,609	239,508
Series of Individually Immaterial Business Acquisitions | Summit Materials, LLC
Business Acquisition [Line Items]
Financial assets		1,740	12,747
Inventories		161	6,251
Property, plant and equipment		15,170	125,207
Other assets		333	1,085
Financial liabilities		(903)	(11,973)
Other long-term liabilities		(407)	(802)
Net assets acquired		16,094	132,515
Goodwill		36,515	108,590
Purchase price		52,609	241,105
Other		0	(1,597)
Net cash paid for acquisitions		$ 52,609	$ 239,508
Argos USA
Business Acquisition [Line Items]
Inventories	$ 95,448
Property, plant and equipment	2,447,340
Other long-term liabilities	(166,233)
Net assets acquired	2,350,267
Goodwill	768,946
Net cash paid for acquisitions	3,119,213
Argos USA | Summit Materials, LLC
Business Acquisition [Line Items]
Inventories	95,448
Property, plant and equipment	2,447,340
Other long-term liabilities	(166,233)
Net assets acquired	2,350,267
Goodwill	768,946
Net cash paid for acquisitions	$ 3,119,213

ACQUISITIONS, DISPOSTIONS, GO_9

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Summary of Goodwill by Reportable Segments (Details) $ in Thousands	3 Months Ended
	Mar. 30, 2024 USD ($)
Goodwill [Roll Forward]
Balance—December 30, 2023	$ 1,224,861
Acquisitions	805,047
Dispositions	(37,938)
Foreign currency translation adjustments	(1,488)
Balance—March 30, 2024	1,990,482
West
Goodwill [Roll Forward]
Balance—December 30, 2023	658,704
Acquisitions	36,101
Dispositions	0
Foreign currency translation adjustments	(1,488)
Balance—March 30, 2024	693,317
East
Goodwill [Roll Forward]
Balance—December 30, 2023	361,501
Acquisitions	0
Dispositions	(37,938)
Foreign currency translation adjustments	0
Balance—March 30, 2024	323,563
Cement
Goodwill [Roll Forward]
Balance—December 30, 2023	204,656
Acquisitions	768,946
Dispositions	0
Foreign currency translation adjustments	0
Balance—March 30, 2024	973,602
Summit Materials, LLC
Goodwill [Roll Forward]
Balance—December 30, 2023	1,225,861
Acquisitions	805,047
Dispositions	(37,938)
Foreign currency translation adjustments	(1,488)
Balance—March 30, 2024	1,991,482
Summit Materials, LLC | West
Goodwill [Roll Forward]
Balance—December 30, 2023	659,704
Acquisitions	36,101
Dispositions	0
Foreign currency translation adjustments	(1,488)
Balance—March 30, 2024	694,317
Summit Materials, LLC | East
Goodwill [Roll Forward]
Balance—December 30, 2023	361,501
Acquisitions	0
Dispositions	(37,938)
Foreign currency translation adjustments	0
Balance—March 30, 2024	323,563
Summit Materials, LLC | Cement
Goodwill [Roll Forward]
Balance—December 30, 2023	204,656
Acquisitions	768,946
Dispositions	0
Foreign currency translation adjustments	0
Balance—March 30, 2024	$ 973,602

ACQUISITIONS, DISPOSTIONS, G_10

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Intangible Assets By Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023	Dec. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (28,335)		$ (18,972)
Amortization expense	9,200	$ 900
Intangible Assets Excluding Intangible Assets Held for Sale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	207,922		87,053
Accumulated Amortization	(28,335)		(18,972)
Net Carrying Amount	179,587		68,081
Operating permits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	38,677		38,677
Accumulated Amortization	(6,089)		(5,691)
Net Carrying Amount	32,588		32,986
Mineral leases
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,375		17,778
Accumulated Amortization	(7,498)		(7,676)
Net Carrying Amount	9,877		10,102
Reserve rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,586		25,586
Accumulated Amortization	(5,226)		(5,020)
Net Carrying Amount	20,360		20,566
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,400		0
Accumulated Amortization	(2,339)		0
Net Carrying Amount	19,061		0
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	104,884		5,012
Accumulated Amortization	(7,183)		(585)
Net Carrying Amount	97,701		4,427
Summit Materials, LLC
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	(28,335)		(18,972)
Amortization expense	9,200	$ 900
Summit Materials, LLC | Intangible Assets Excluding Intangible Assets Held for Sale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	207,922		87,053
Accumulated Amortization	(28,335)		(18,972)
Net Carrying Amount	179,587		68,081
Summit Materials, LLC | Operating permits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	38,677		38,677
Accumulated Amortization	(6,089)		(5,691)
Net Carrying Amount	32,588		32,986
Summit Materials, LLC | Mineral leases
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,375		17,778
Accumulated Amortization	(7,498)		(7,676)
Net Carrying Amount	9,877		10,102
Summit Materials, LLC | Reserve rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,586		25,586
Accumulated Amortization	(5,226)		(5,020)
Net Carrying Amount	20,360		20,566
Summit Materials, LLC | Intellectual property
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,400		0
Accumulated Amortization	(2,339)		0
Net Carrying Amount	19,061		0
Summit Materials, LLC | Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	104,884		5,012
Accumulated Amortization	(7,183)		(585)
Net Carrying Amount	$ 97,701		$ 4,427

ACQUISITIONS, DISPOSTIONS, G_11

ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 30, 2023
Estimated amortization expense
2024 (nine months)	$ 33,705
2025	44,713
2026	34,345
2027	6,629
2028	5,707
2029	4,999
Thereafter	49,489
Total	179,587	$ 68,081
Summit Materials, LLC
Estimated amortization expense
2024 (nine months)	33,705
2025	44,713
2026	34,345
2027	6,629
2028	5,707
2029	4,999
Thereafter	49,489
Total	$ 179,587	$ 68,081

REVENUE RECOGNITION - By Produc

REVENUE RECOGNITION - By Product (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Revenue from External Customer [Line Items]
Total revenue	$ 805,015	$ 435,388
Aggregates
Revenue from External Customer [Line Items]
Total revenue	145,511	143,653
Cement
Revenue from External Customer [Line Items]
Total revenue	224,097	49,013
Ready-mix concrete
Revenue from External Customer [Line Items]
Total revenue	312,047	138,778
Asphalt
Revenue from External Customer [Line Items]
Total revenue	27,985	26,635
Paving and related services
Revenue from External Customer [Line Items]
Total revenue	40,922	27,184
Other
Revenue from External Customer [Line Items]
Total revenue	54,453	50,125
Summit Materials, LLC
Revenue from External Customer [Line Items]
Total revenue	805,015	435,388
Summit Materials, LLC | Aggregates
Revenue from External Customer [Line Items]
Total revenue	145,511	143,653
Summit Materials, LLC | Cement
Revenue from External Customer [Line Items]
Total revenue	224,097	49,013
Summit Materials, LLC | Ready-mix concrete
Revenue from External Customer [Line Items]
Total revenue	312,047	138,778
Summit Materials, LLC | Asphalt
Revenue from External Customer [Line Items]
Total revenue	27,985	26,635
Summit Materials, LLC | Paving and related services
Revenue from External Customer [Line Items]
Total revenue	40,922	27,184
Summit Materials, LLC | Other
Revenue from External Customer [Line Items]
Total revenue	$ 54,453	$ 50,125

REVENUE RECOGNITION - Schedule

REVENUE RECOGNITION - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Dec. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 441,049	$ 228,697
Construction contract receivables	15,110	51,567
Retention receivables	10,649	13,541
Receivables from related parties	518	0
Accounts receivable	467,326	293,805
Less: Allowance for doubtful accounts	(12,676)	(6,553)
Accounts receivable, net	$ 454,650	$ 287,252
Other Receivable, after Allowance for Credit Loss, Related Party, Type [Extensible Enumeration]	Related Party [Member]	Related Party [Member]
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	$ 441,198	$ 228,697
Construction contract receivables	15,110	51,567
Retention receivables	10,649	13,541
Receivables from related parties	518	0
Accounts receivable	467,475	293,805
Less: Allowance for doubtful accounts	(12,676)	(6,553)
Accounts receivable, net	$ 454,799	$ 287,252
Other Receivable, after Allowance for Credit Loss, Related Party, Type [Extensible Enumeration]	Related Party [Member]	Related Party [Member]
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	Mar. 30, 2024	Dec. 30, 2023
Inventory [Line Items]
Aggregate stockpiles	$ 172,593	$ 165,272
Finished goods	85,921	43,122
Work in process	22,507	10,702
Raw materials	57,480	22,254
Total	338,501	241,350
Summit Materials, LLC
Inventory [Line Items]
Aggregate stockpiles	172,593	165,272
Finished goods	85,921	43,122
Work in process	22,507	10,702
Raw materials	57,480	22,254
Total	$ 338,501	$ 241,350

ACCRUED EXPENSES (Details)

ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 30, 2023
Schedule Of Accrued Expenses [Line Items]
Interest	$ 43,210	$ 27,593
Payroll and benefits	29,616	63,888
Finance lease obligations	4,698	4,020
Insurance	34,653	25,277
Current portion of accrued taxes and TRA liability	23,317	11,042
Deferred asset purchase payments	7,269	5,903
Professional fees	6,580	2,036
Other	42,433	31,932
Total	191,776	171,691
Summit Materials, LLC
Schedule Of Accrued Expenses [Line Items]
Interest	43,210	27,593
Payroll and benefits	29,616	63,888
Finance lease obligations	4,698	4,020
Insurance	34,653	25,277
Current portion of accrued taxes and TRA liability	21,475	12,285
Deferred asset purchase payments	7,269	5,903
Professional fees	6,580	2,036
Other	42,433	31,932
Total	$ 189,934	$ 172,934

DEBT - Schedule of Debt (Detail

DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 30, 2023
Debt Instrument [Line Items]
Total debt	$ 2,807,601	$ 2,300,473
Current portion of long-term debt	7,575	3,822
Long-term debt	2,800,026	2,296,651
Gross amount	2,810,000
Debt discount	2,399
Term Loan, due 2027
Debt Instrument [Line Items]
Total debt	1,007,601	500,473
Gross amount	1,010,000	504,500
Debt discount	2,400	4,000
Summit Materials, LLC
Debt Instrument [Line Items]
Total debt	2,807,601	2,300,473
Current portion of long-term debt	7,575	3,822
Long-term debt	2,800,026	2,296,651
Gross amount	2,810,000
Debt discount	2,399
Summit Materials, LLC | Term Loan, due 2027
Debt Instrument [Line Items]
Total debt	1,007,601	500,473
Gross amount	1,010,000	504,500
Debt discount	2,400	4,000
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 | 7 1/4% Senior Notes Due 2031
Debt Instrument [Line Items]
Total debt	$ 800,000	800,000
Debt instrument interest rate (as a percent)	7.25%
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%
Senior Notes | Summit Materials, LLC | 7 1/4% Senior Notes Due 2031
Debt Instrument [Line Items]
Total debt	$ 800,000	$ 800,000
Debt instrument interest rate (as a percent)	7.25%

DEBT - Schedule of Contractual

DEBT - Schedule of Contractual Payments of Long-Term Debt (Details) $ in Thousands	Mar. 30, 2024 USD ($)
Debt Instrument [Line Items]
2024 (nine months)	$ 5,050
2025	12,625
2026	10,100
2027	310,100
2028	10,100
2029	1,662,025
Thereafter	800,000
Total	2,810,000
Less: Original issue net discount	(2,399)
Less: Deferred financing costs	(27,317)
Total debt	2,780,284
Summit Materials, LLC
Debt Instrument [Line Items]
2024 (nine months)	5,050
2025	12,625
2026	10,100
2027	310,100
2028	10,100
2029	1,662,025
Thereafter	800,000
Total	2,810,000
Less: Original issue net discount	(2,399)
Less: Deferred financing costs	(27,317)
Total debt	$ 2,780,284

DEBT - Senior Notes (Details)

DEBT - Senior Notes (Details) - USD ($)	Dec. 14, 2023	Aug. 11, 2020	Mar. 15, 2019	Mar. 30, 2024
Issuers | 5 1/4% Senior Notes Due 2029
Debt Instrument [Line Items]
Debt instrument, face amount		$ 700,000,000
Senior notes, interest rate (as a percent)		5.25%
Proceeds net of related fees and expenses		$ 690,400,000
Issuers | 6 1/2% Senior Notes, due 2027
Debt Instrument [Line Items]
Debt instrument, face amount			$ 300,000,000
Senior notes, interest rate (as a percent)			6.50%
Senior Notes | 7 1/4% Senior Notes Due 2031
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)				7.25%
Senior Notes | 5 1/4% Senior Notes Due 2029
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)				5.25%
Senior Notes | 6 1/2% Senior Notes, due 2027
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)				6.50%
Senior Notes | Issuers | 7 1/4% Senior Notes Due 2031
Debt Instrument [Line Items]
Debt instrument, face amount	$ 800,000,000
Senior notes, interest rate (as a percent)	7.25%
Percentage of par value of senior notes	100%
Proceeds net of related fees and expenses	$ 788,300,000
Senior Notes | Issuers | 5 1/4% Senior Notes Due 2029
Debt Instrument [Line Items]
Debt instrument, face amount		$ 700,000,000
Senior notes, interest rate (as a percent)		5.25%
Percentage of par value of senior notes		100%
Proceeds net of related fees and expenses		$ 690,400,000
Senior Notes | Issuers | 6 1/2% Senior Notes, due 2027
Debt Instrument [Line Items]
Debt instrument, face amount			$ 300,000,000
Senior notes, interest rate (as a percent)			6.50%
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)		1 Months Ended	3 Months Ended
	Jan. 12, 2024 USD ($)	Sep. 30, 2023 USD ($)	Mar. 30, 2024 USD ($)	Apr. 01, 2023 USD ($)	Jan. 11, 2024 USD ($)	Dec. 30, 2023 USD ($)
Debt Instrument [Line Items]
Write off of deferred financing fees			$ 1,462,000	$ 160,000
Repayments of term loan			506,392,000	4,414,000
Summit Materials, LLC
Debt Instrument [Line Items]
Write off of deferred financing fees			1,462,000	160,000
Repayments of term loan			506,392,000	$ 4,414,000
Summit Materials, LLC | Line of Credit
Debt Instrument [Line Items]
Write off of deferred financing fees			1,500,000
Term Loan, due 2027 | Summit Materials, LLC
Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,010,000,000
Effective interest rate	7.83%
Prepayment premium percentage	1%
Quarterly amortization payments, percentage	0.25%
Amount refinanced	$ 504,500,000
Refinancing expense			5,500,000
Write off of debt discount			4,000,000
Write off of deferred financing fees			1,500,000
Maturity date adjustment, amount outstanding threshold			125,000,000
Term Loan, due 2027 | Summit Materials, LLC | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Term Loan, due 2027 | Summit Materials, LLC | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1%
Term Loan, due 2027 | Summit Materials, LLC | Secured Overnight Financing Rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit commitment	$ 625,000,000				$ 395,000,000
Revolving Credit Facility | Summit Materials, LLC
Debt Instrument [Line Items]
Amount outstanding			0			$ 0
Remaining borrowing capacity			604,100,000
Revolving Credit Facility | Summit Materials, LLC | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Revolving Credit Facility | Summit Materials, LLC | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1%
Revolving Credit Facility | Summit Materials, LLC | Secured Overnight Financing Rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Revolving Credit Facility | Summit Materials, LLC | Secured Overnight Financing Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0%
Letter of Credit | Summit Materials, LLC
Debt Instrument [Line Items]
Amount outstanding			$ 20,900,000
Senior Secured Credit Facilities | Summit Materials, LLC
Debt Instrument [Line Items]
First lien leverage ratio			4.75
Senior Secured Credit Facilities | Summit Materials, LLC | Line of Credit | Argos USA
Debt Instrument [Line Items]
Amount outstanding			$ 11,400,000
Bridge Loan
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	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Accumulated Amortization [Roll Forward]
Beginning balance	$ 14,463	$ 11,489
Loan origination fees	17,550	1,566
Amortization	(1,550)	(616)
Write off of deferred financing fees	(1,462)	(160)
Ending balance	29,001	12,279
Summit Materials, LLC
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Accumulated Amortization [Roll Forward]
Beginning balance	14,463	11,489
Loan origination fees	17,550	1,566
Amortization	(1,550)	(616)
Write off of deferred financing fees	(1,462)	(160)
Ending balance	$ 29,001	$ 12,279

DEBT - Other (Details)

DEBT - Other (Details) - CAD ($)	Jan. 15, 2015	Mar. 30, 2024	Dec. 30, 2023
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 (Details)

INCOME TAXES (Details) - USD ($)	3 Months Ended			12 Months Ended
	Mar. 30, 2024	Sep. 30, 2023	Apr. 01, 2023	Dec. 31, 2015	Dec. 30, 2023
Income Taxes [Line Items]
Income tax benefit	$ (11,065,000)		$ (6,466,000)
Valuation allowance	1,113,000				$ 1,113,000
Income tax provision, interest or penalties recognized	$ 0		0
Tax Receivable Agreement
Income Taxes [Line Items]
Exchanges during period (in shares)	763,243
Increase in Tax Receivable Agreement liability	$ 6,700,000
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 benefit	$ (196,000)		(467,000)
Income tax provision, interest or penalties recognized	0		$ 0
Current portion of tax receivable agreement interests	3,500,000				6,318,000
Tax receivable agreement interest, net of current portion	122,631,000				$ 126,131,000
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	3,500,000
Tax receivable agreement interest, net of current portion	$ 122,600,000

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Reconciliation of basic to diluted loss per share
Net loss attributable to Summit Inc.	$ (66,866)	$ (30,804)
Diluted net loss attributable to Summit Inc.	$ (66,866)	$ (30,804)
LP Units
Reconciliation of basic to diluted loss per share
Anti dilutive shares excluded from calculation of earnings per share (in shares)	511,565	1,311,257
Add: stock options
Reconciliation of basic to diluted loss per share
Anti dilutive shares excluded from calculation of earnings per share (in shares)	239,429	279,680
Warrants
Reconciliation of basic to diluted loss per share
Anti dilutive shares excluded from calculation of earnings per share (in shares)	31,519	31,519
Time-vesting restricted stock units
Reconciliation of basic to diluted loss per share
Anti dilutive shares excluded from calculation of earnings per share (in shares)	1,186,426	1,051,844
Market-based restricted stock units
Reconciliation of basic to diluted loss per share
Anti dilutive shares excluded from calculation of earnings per share (in shares)	550,165	439,704
Common Class A And Restricted Stock
Reconciliation of basic to diluted loss per share
Weighted average shares of Class A stock outstanding (in shares)	167,511,575	118,679,656
Weighted average shares outstanding (in shares)	167,511,575	118,679,656
Basic earning per share (in usd per share)	$ (0.40)	$ (0.26)
Weighted average dilutive shares outstanding (in shares)	167,511,575	118,679,656
Common Class A
Reconciliation of basic to diluted loss per share
Weighted average shares of Class A stock outstanding (in shares)	167,446,041	118,564,556
Weighted average shares outstanding (in shares)	167,446,041	118,564,556
Basic earning per share (in usd per share)	$ (0.40)	$ (0.26)
Add: warrants (in shares)	0	0
Weighted average dilutive shares outstanding (in shares)	167,511,575	118,679,656
Diluted earning per share (in usd per share)	$ (0.40)	$ (0.26)
Common Class A | LP Units
Reconciliation of basic to diluted loss per share
Add: share-based payment arrangements (in shares)	0	0
Common Class A | Add: stock options
Reconciliation of basic to diluted loss per share
Add: share-based payment arrangements (in shares)	0	0
Common Class A | Add: restricted stock units
Reconciliation of basic to diluted loss per share
Add: share-based payment arrangements (in shares)	0	0
Common Class A | Add: performance stock units
Reconciliation of basic to diluted loss per share
Add: share-based payment arrangements (in shares)	0	0
Restricted Stock
Reconciliation of basic to diluted loss per share
Add: Nonvested restricted stock awards of retirement eligible shares (in shares)	65,534	115,100

STOCKHOLDERS' EQUITY_MEMBERS'_3

STOCKHOLDERS' EQUITY/MEMBERS' INTEREST - Narrative (Details) - USD ($)	Mar. 30, 2024	Dec. 30, 2023	Mar. 31, 2022
Summit Holdings LP
Schedule of Capitalization, Equity [Line Items]
Noncontrolling interest elimination (as a percent)	0%	0.60%
Common Class A
Schedule of Capitalization, Equity [Line Items]
Share repurchase program, authorized amount			$ 250,000,000
Remaining authorized repurchase amount	$ 149,000,000

STOCKHOLDERS' EQUITY_MEMBERS'_4

STOCKHOLDERS' EQUITY/MEMBERS' INTEREST - Equity Offerings (Details) - shares	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023	Dec. 30, 2023	Dec. 31, 2022
Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	119,529,380	118,408,655
Exchanges during period (in shares)	763,243	2,000
Stock option exercises (in shares)	29,216	902
Issuance of Class A common stock (in shares)	54,720,000
Other equity transactions (in shares)	412,411	407,114
Ending balance (in shares)	175,454,250	118,818,671
Summit Materials, Inc. and Summit Holdings, LP
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	120,292,623	119,720,659
Exchanges during period (in shares)	0	0
Stock option exercises (in shares)	29,216	902
Issuance of Class A common stock (in shares)	54,720,000
Other equity transactions (in shares)	412,411	407,114
Ending balance (in shares)	175,454,250	120,128,675
LP Units | Summit Holdings LP
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Number of LP Units outstanding, beginning balance (in shares)	763,243	1,312,004
Number of LP Units exchanged (in shares)	(763,243)	(2,000)
Number of LP Units outstanding, ending balance (in shares)	0	1,310,004
Summit Materials Inc
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ownership percentage	100%	98.90%	99.40%	98.90%

STOCKHOLDERS' EQUITY_MEMBERS'_5

STOCKHOLDERS' EQUITY/MEMBERS' INTEREST - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Changes in each component of accumulated other comprehensive loss
Beginning balance	$ 2,316,580	$ 2,011,990
Ending balance	4,218,637	1,979,946
Summit Materials, LLC
Changes in each component of accumulated other comprehensive loss
Beginning balance	2,355,005	2,143,150
Foreign currency translation adjustment, net of tax	(4,724)	203
Ending balance	4,243,753	2,105,146
Change in retirement plans
Changes in each component of accumulated other comprehensive loss
Beginning balance	6,840	6,356
Ending balance	6,840	6,356
Change in retirement plans | Summit Materials, LLC
Changes in each component of accumulated other comprehensive loss
Beginning balance	(120)	(762)
Ending balance	(120)	(762)
Foreign currency translation adjustments
Changes in each component of accumulated other comprehensive loss
Beginning balance	435	(3,272)
Foreign currency translation adjustment, net of tax	(3,585)	161
Ending balance	(3,150)	(3,111)
Foreign currency translation adjustments | Summit Materials, LLC
Changes in each component of accumulated other comprehensive loss
Beginning balance	(15,689)	(20,614)
Foreign currency translation adjustment, net of tax	(4,724)	203
Ending balance	(20,413)	(20,411)
Accumulated Other Comprehensive Income
Changes in each component of accumulated other comprehensive loss
Beginning balance	7,275	3,084
Foreign currency translation adjustment, net of tax	(3,585)	161
Ending balance	3,690	3,245
Accumulated Other Comprehensive Income | Summit Materials, LLC
Changes in each component of accumulated other comprehensive loss
Beginning balance	(15,809)	(21,376)
Ending balance	$ (20,533)	$ (21,173)

SUPPLEMENTAL CASH FLOW INFORM_3

SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 12, 2024	Mar. 30, 2024	Apr. 01, 2023
Cash payments:
Interest		$ 32,422	$ 37,970
Payments for income taxes, net		2,623	2,088
Operating cash payments on operating leases		4,846	2,402
Operating cash payments on finance leases		694	149
Finance cash payments on finance leases		1,572	4,011
Non cash investing and financing activities:
Accrued liabilities for purchases of property, plant and equipment		29,281	21,911
Right of use assets obtained in exchange for operating lease obligations		62,305	679
Right of use assets obtained in exchange for finance leases obligations		26,235	413
Exchange of LP Units to shares of Class A common stock		32,633	60
Issuance of Class A common stock		1,973,750	0
Argos USA | Preferred Stock
Non cash investing and financing activities:
Business acquisition number of shares (in shares)	1
Argos USA | Common Class A
Non cash investing and financing activities:
Business acquisition number of shares (in shares)	54,720,000
Summit Materials, LLC
Cash payments:
Interest		32,422	37,970
Payments for income taxes, net		2,623	2,088
Operating cash payments on operating leases		4,846	2,402
Operating cash payments on finance leases		694	149
Finance cash payments on finance leases		1,572	4,011
Non cash investing and financing activities:
Accrued liabilities for purchases of property, plant and equipment		29,281	21,911
Right of use assets obtained in exchange for operating lease obligations		62,305	679
Right of use assets obtained in exchange for finance leases obligations		$ 26,235	$ 413
Summit Materials, LLC | Argos USA | Preferred Stock
Non cash investing and financing activities:
Business acquisition number of shares (in shares)	1
Summit Materials, LLC | Argos USA | Common Class A
Non cash investing and financing activities:
Business acquisition number of shares (in shares)	54,720,000

LEASES (Details)

LEASES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023	Dec. 30, 2023
Lease, Cost [Abstract]
Operating lease cost	$ 6,029	$ 2,641
Variable lease cost	1,665	30
Short-term lease cost	9,322	7,270
Financing lease cost:
Amortization of right-of-use assets	1,459	818
Interest on lease liabilities	645	148
Total lease cost	19,120	10,907
Operating leases:
Operating lease right-of-use assets	89,251		$ 36,553
Current operating lease liabilities	16,745		8,596
Noncurrent operating lease liabilities	78,618		33,230
Total operating lease liabilities	95,363		41,826
Finance leases:
Property and equipment, gross	53,619		30,136
Less accumulated depreciation	$ (11,715)		$ (12,088)
Finance lease, right-of-use asset, statement of financial position [Extensible List]	Property, plant and equipment, net		Property, plant and equipment, net
Property and equipment, net	$ 41,904		$ 18,048
Finance lease, liability, current, statement of financial position [Extensible Enumeration]	Accrued expenses		Accrued expenses
Current finance lease liabilities	$ 4,698		$ 4,020
Finance lease, liability, noncurrent, statement of financial position [Extensible Enumeration]	Other noncurrent liabilities		Other noncurrent liabilities
Long-term finance lease liabilities	$ 32,189		$ 14,357
Total finance lease liabilities	$ 36,887		$ 18,377
Weighted average remaining lease term (years):
Operating leases	7 years 8 months 12 days		8 years 4 months 24 days
Finance lease	10 years 7 months 6 days		6 years
Weighted average discount rate:
Operating leases	7.10%		5.10%
Finance leases	8.10%		7.70%
Operating Leases
2024 (nine months)	$ 17,288
2025	20,808
2026	17,554
2027	14,089
2028	10,906
2029	9,407
Thereafter	33,031
Total lease payments	123,083
Less imputed interest	(27,720)
Present value of lease payments	95,363		$ 41,826
Finance Leases
2024 (nine months)	5,734
2025	6,570
2026	5,072
2027	4,870
2028	4,627
2029	4,477
Thereafter	24,743
Total lease payments	56,093
Less imputed interest	(19,206)
Present value of lease payments	36,887		18,377
Summit Materials, LLC
Lease, Cost [Abstract]
Operating lease cost	6,029	2,641
Variable lease cost	1,665	30
Short-term lease cost	9,322	7,270
Financing lease cost:
Amortization of right-of-use assets	1,459	818
Interest on lease liabilities	645	148
Total lease cost	19,120	$ 10,907
Operating leases:
Operating lease right-of-use assets	89,251		36,553
Current operating lease liabilities	16,745		8,596
Noncurrent operating lease liabilities	78,618		33,230
Total operating lease liabilities	95,363		41,826
Finance leases:
Property and equipment, gross	53,619		30,136
Less accumulated depreciation	$ (11,715)		$ (12,088)
Finance lease, right-of-use asset, statement of financial position [Extensible List]	Property, plant and equipment, net		Property, plant and equipment, net
Property and equipment, net	$ 41,904		$ 18,048
Finance lease, liability, current, statement of financial position [Extensible Enumeration]	Accrued expenses		Accrued expenses
Current finance lease liabilities	$ 4,698		$ 4,020
Finance lease, liability, noncurrent, statement of financial position [Extensible Enumeration]	Other noncurrent liabilities		Other noncurrent liabilities
Long-term finance lease liabilities	$ 32,189		$ 14,357
Total finance lease liabilities	$ 36,887		$ 18,377
Weighted average remaining lease term (years):
Operating leases	7 years 8 months 12 days		8 years 4 months 24 days
Finance lease	10 years 7 months 6 days		6 years
Weighted average discount rate:
Operating leases	7.10%		5.10%
Finance leases	8.10%		7.70%
Operating Leases
2024 (nine months)	$ 17,288
2025	20,808
2026	17,554
2027	14,089
2028	10,906
2029	9,407
Thereafter	33,031
Total lease payments	123,083
Less imputed interest	(27,720)
Present value of lease payments	95,363		$ 41,826
Finance Leases
2024 (nine months)	5,734
2025	6,570
2026	5,072
2027	4,870
2028	4,627
2029	4,477
Thereafter	24,743
Total lease payments	56,093
Less imputed interest	(19,206)
Present value of lease payments	$ 36,887		$ 18,377

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jan. 04, 2021	Mar. 30, 2024	Dec. 30, 2023
Loss Contingencies [Line Items]
Anticipated costs		$ 173.3	$ 141.8
Tax incentive receivable			460
Tax incentive liability			460
Payments for tax incentive financing			27.1
Term of purchase commitments		1 year
Site Restoration Obligations | Other noncurrent liabilities
Loss Contingencies [Line Items]
Site restoration obligation, non-current		$ 45.3	44.8
Site Restoration Obligations | Accrued expenses.
Loss Contingencies [Line Items]
Site restoration obligation, current		$ 5.9	5.1
Argos USA
Loss Contingencies [Line Items]
Payment for legal penalty	$ 20
Deferred Prosecution Agreement, term	3 years
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		$ 173.3	141.8
Summit Materials, LLC | Site Restoration Obligations | Other noncurrent liabilities
Loss Contingencies [Line Items]
Site restoration obligation, non-current		45.3	44.8
Summit Materials, LLC | Site Restoration Obligations | Accrued expenses.
Loss Contingencies [Line Items]
Site restoration obligation, current		$ 5.9	$ 5.1

FAIR VALUE - Fair Value Measure

FAIR VALUE - Fair Value Measurements (Details) - Level 3	3 Months Ended
	Mar. 30, 2024 USD ($)	Apr. 01, 2023 USD ($)	Dec. 30, 2023 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	$ 1,701,000		$ 139,000
Acquisition-related liabilities and Other noncurrent liabilities - Contingent consideration	7,727,000		9,254,000
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	1,701,000		139,000
Acquisition-related liabilities and Other noncurrent liabilities - Contingent consideration	7,727,000		$ 9,254,000
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	Mar. 30, 2024	Dec. 30, 2023
Financial Instruments
Current portion of long-term debt	$ 7,575	$ 3,822
Summit Materials, LLC
Financial Instruments
Current portion of long-term debt	7,575	3,822
Level 1 | Fair Value
Financial Instruments
Long-term debt	2,826,313	2,329,606
Level 1 | Carrying Value
Financial Instruments
Long-term debt	2,807,601	2,300,473
Level 1 | Summit Materials, LLC
Financial Instruments
Current portion of long-term debt	7,600	3,800
Level 1 | Summit Materials, LLC | Fair Value
Financial Instruments
Long-term debt	2,826,313	2,329,606
Level 1 | Summit Materials, LLC | Carrying Value
Financial Instruments
Long-term debt	2,807,601	2,300,473
Level 3 | Fair Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	7,292	6,868
Long term portion of deferred consideration and noncompete obligations	12,928	18,767
Level 3 | Carrying Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	7,292	6,868
Long term portion of deferred consideration and noncompete obligations	12,928	18,767
Level 3 | Summit Materials, LLC | Fair Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	7,292	6,868
Long term portion of deferred consideration and noncompete obligations	12,928	18,767
Level 3 | Summit Materials, LLC | Carrying Value
Financial Instruments
Current portion of deferred consideration and noncompete obligations	7,292	6,868
Long term portion of deferred consideration and noncompete obligations	12,928	18,767
Fair Value, Inputs, Level 1 | Fair Value
Financial Instruments
Current portion of long-term debt	$ 7,600	$ 3,800

SEGMENT INFORMATION (Details)

SEGMENT INFORMATION (Details)	3 Months Ended
	Mar. 30, 2024 USD ($) segment	Apr. 01, 2023 USD ($)	Dec. 30, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	3
Number of reportable segments | segment	3
Total revenue	$ 805,015,000	$ 435,388,000
Loss from operations before taxes	(78,335,000)	(37,678,000)
Interest expense	51,892,000	27,420,000
Depreciation, depletion and amortization	94,963,000	50,188,000
Accretion	1,008,000	706,000
Loss on debt financings	5,453,000	493,000
Gain on sale of businesses	(14,985,000)	0
Non-cash compensation	6,720,000	4,708,000
Argos USA acquisition and integration costs	61,294,000	0
Other	(6,785,000)	(4,636,000)
Total Adjusted EBITDA	121,225,000	41,201,000
Total purchases of property, plant and equipment	58,519,000	63,584,000
Total depreciation, depletion, amortization and accretion	95,971,000	50,894,000
Total assets	8,129,900,000		$ 5,149,582,000
Operating segment
Segment Reporting Information [Line Items]
Total purchases of property, plant and equipment	54,104,000	60,688,000
Total depreciation, depletion, amortization and accretion	94,124,000	49,906,000
Total assets	7,612,107,000		3,913,666,000
Corporate and other
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	(19,105,000)	(10,339,000)
Total purchases of property, plant and equipment	4,415,000	2,896,000
Total depreciation, depletion, amortization and accretion	1,847,000	988,000
Total assets	517,793,000		1,235,916,000
West
Segment Reporting Information [Line Items]
Total revenue	304,538,000	250,882,000
West | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	43,400,000	32,678,000
Total purchases of property, plant and equipment	25,844,000	38,174,000
Total depreciation, depletion, amortization and accretion	30,338,000	26,373,000
Total assets	1,970,633,000		1,837,214,000
East
Segment Reporting Information [Line Items]
Total revenue	268,694,000	130,389,000
Gain on sale of businesses	(15,000,000)
East | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	37,476,000	18,852,000
Total purchases of property, plant and equipment	16,224,000	15,518,000
Total depreciation, depletion, amortization and accretion	23,081,000	15,535,000
Total assets	1,608,962,000		1,171,944,000
Cement
Segment Reporting Information [Line Items]
Total revenue	231,783,000	54,117,000
Cement | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	59,454,000	10,000
Total purchases of property, plant and equipment	12,036,000	6,996,000
Total depreciation, depletion, amortization and accretion	40,705,000	7,998,000
Total assets	$ 4,032,512,000		904,508,000
Summit Materials, LLC
Segment Reporting Information [Line Items]
Number of operating segments | segment	3
Number of reportable segments | segment	3
Total revenue	$ 805,015,000	435,388,000
Loss from operations before taxes	(78,526,000)	(37,678,000)
Interest expense	51,892,000	27,420,000
Depreciation, depletion and amortization	94,963,000	50,188,000
Accretion	1,008,000	706,000
Loss on debt financings	5,453,000	493,000
Gain on sale of businesses	(14,985,000)	0
Non-cash compensation	6,720,000	4,708,000
Argos USA acquisition and integration costs	61,294,000	0
Other	(6,594,000)	(4,636,000)
Total Adjusted EBITDA	121,225,000	41,201,000
Total purchases of property, plant and equipment	58,519,000	63,584,000
Total depreciation, depletion, amortization and accretion	95,971,000	50,894,000
Total assets	8,245,278,000		5,212,529,000
Summit Materials, LLC | Operating segment
Segment Reporting Information [Line Items]
Total purchases of property, plant and equipment	54,104,000	60,688,000
Total depreciation, depletion, amortization and accretion	94,124,000	49,906,000
Total assets	7,612,107,000		3,913,666,000
Summit Materials, LLC | Corporate and other
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	(19,105,000)	(10,339,000)
Total purchases of property, plant and equipment	4,415,000	2,896,000
Total depreciation, depletion, amortization and accretion	1,847,000	988,000
Total assets	633,171,000		1,298,863,000
Summit Materials, LLC | West
Segment Reporting Information [Line Items]
Total revenue	304,538,000	250,882,000
Summit Materials, LLC | West | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	43,400,000	32,678,000
Total purchases of property, plant and equipment	25,844,000	38,174,000
Total depreciation, depletion, amortization and accretion	30,338,000	26,373,000
Total assets	1,970,633,000		1,837,214,000
Summit Materials, LLC | East
Segment Reporting Information [Line Items]
Total revenue	268,694,000	130,389,000
Gain on sale of businesses	(15,000,000)
Summit Materials, LLC | East | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	37,476,000	18,852,000
Total purchases of property, plant and equipment	16,224,000	15,518,000
Total depreciation, depletion, amortization and accretion	23,081,000	15,535,000
Total assets	1,608,962,000		1,171,944,000
Summit Materials, LLC | Cement
Segment Reporting Information [Line Items]
Total revenue	231,783,000	54,117,000
Summit Materials, LLC | Cement | Operating segment
Segment Reporting Information [Line Items]
Total Adjusted EBITDA	59,454,000	10,000
Total purchases of property, plant and equipment	12,036,000	6,996,000
Total depreciation, depletion, amortization and accretion	40,705,000	$ 7,998,000
Total assets	$ 4,032,512,000		$ 904,508,000

RELATED PARTY (Details)

RELATED PARTY (Details) - Affiliated Entity T in Thousands, $ in Millions	3 Months Ended
	Mar. 30, 2024 USD ($) T
Related Party Transaction [Line Items]
General and administrative expenses	$ 0.3
Minimum quantity required to be purchased | T	425
Amount purchased during period	$ 9.1
Amount paid during period	5
Amount paid during period	0.3
Summit Materials, LLC
Related Party Transaction [Line Items]
General and administrative expenses	$ 0.3
Minimum quantity required to be purchased | T	425
Amount purchased during period	$ 9.1
Amount paid during period	5
Amount paid during period	$ 0.3

GUARANTOR AND NON-GUARANTOR F_3

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Schedule of Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 30, 2023	Apr. 01, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 498,110	$ 374,162
Restricted cash	0	800,000
Accounts receivable, net	454,650	287,252
Cost and estimated earnings in excess of billings	11,681	10,289
Inventories	338,501	241,350
Total current assets	1,344,961	1,732,124
Property, plant and equipment, net	4,417,355	1,976,820
Goodwill	1,990,482	1,224,861
Intangible assets, net	179,587	68,081
Operating lease right-of-use assets	89,251	36,553
Total assets	8,129,900	5,149,582
Current liabilities:
Current portion of debt	7,575	3,822
Current portion of acquisition-related liabilities	8,993	7,007
Accounts payable	290,914	123,621
Current operating lease liabilities	16,745	8,596
Billings in excess of costs and estimated earnings	6,005	8,228
Total current liabilities	522,008	322,965
Long-term debt	2,772,709	2,283,639
Acquisition-related liabilities	20,655	28,021
Noncurrent operating lease liabilities	78,618	33,230
Total liabilities	3,911,263	2,833,002
Total liabilities and members' interest	8,129,900	5,149,582
Summit Materials, LLC
Current assets:
Cash and cash equivalents	486,208	355,669
Restricted cash	0	800,000
Accounts receivable, net	454,799	287,252
Intercompany receivables	0	0
Cost and estimated earnings in excess of billings	11,681	10,289
Inventories	338,501	241,350
Other current assets	45,519	25,389
Total current assets	1,336,708	1,719,949
Property, plant and equipment, net	4,417,355	1,976,820
Goodwill	1,991,482	1,225,861
Intangible assets, net	179,587	68,081
Operating lease right-of-use assets	89,251	36,553
Other assets	230,895	185,265
Total assets	8,245,278	5,212,529
Current liabilities:
Current portion of debt	7,575	3,822
Current portion of acquisition-related liabilities	8,993	7,007
Accounts payable	290,914	123,621
Accrued expenses	189,934	172,934
Current operating lease liabilities	16,745	8,596
Intercompany payables	0	0
Billings in excess of costs and estimated earnings	6,005	8,228
Total current liabilities	520,166	324,208
Long-term debt	2,772,709	2,283,639
Acquisition-related liabilities	20,655	28,021
Noncurrent operating lease liabilities	78,618	33,230
Other noncurrent liabilities	609,377	188,426
Total liabilities	4,001,525	2,857,524
Total member's interest	4,243,753	2,355,005	$ 2,105,146	$ 2,143,150
Total liabilities and members' interest	8,245,278	5,212,529
Summit Materials, LLC | Eliminations
Current assets:
Cash and cash equivalents	(3,208)	(2,755)
Restricted cash		0
Accounts receivable, net	(23)	(23)
Intercompany receivables	(5,296,201)	(3,419,449)
Cost and estimated earnings in excess of billings	0	0
Inventories	0	0
Other current assets	0	0
Total current assets	(5,299,386)	(3,422,227)
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	(5,442,343)	(5,435,646)
Total assets	(10,741,729)	(8,857,873)
Current liabilities:
Current portion of debt	0	0
Current portion of acquisition-related liabilities	0	0
Accounts payable	(126)	(23)
Accrued expenses	(3,208)	(2,755)
Current operating lease liabilities	0	0
Intercompany payables	(5,296,052)	(3,419,449)
Billings in excess of costs and estimated earnings	0	0
Total current liabilities	(5,299,386)	(3,422,227)
Long-term debt	0	0
Acquisition-related liabilities	0	0
Noncurrent operating lease liabilities	0	0
Other noncurrent liabilities	(98,585)	(133,921)
Total liabilities	(5,397,971)	(3,556,148)
Total member's interest	(5,343,758)	(5,301,725)
Total liabilities and members' interest	(10,741,729)	(8,857,873)
Summit Materials, LLC | Issuers | Reportable Legal Entities
Current assets:
Cash and cash equivalents	444,621	310,410
Restricted cash		800,000
Accounts receivable, net	1,723	6,441
Intercompany receivables	2,962,527	1,087,570
Cost and estimated earnings in excess of billings	0	0
Inventories	0	0
Other current assets	6,675	11,480
Total current assets	3,415,546	2,215,901
Property, plant and equipment, net	43,770	35,812
Goodwill	0	0
Intangible assets, net	0	0
Operating lease right-of-use assets	8,539	3,749
Other assets	5,391,496	5,384,259
Total assets	8,859,351	7,639,721
Current liabilities:
Current portion of debt	7,575	3,822
Current portion of acquisition-related liabilities	0	0
Accounts payable	33,255	4,290
Accrued expenses	100,272	88,318
Current operating lease liabilities	1,329	804
Intercompany payables	1,418,021	2,890,124
Billings in excess of costs and estimated earnings	0	0
Total current liabilities	1,560,452	2,987,358
Long-term debt	2,772,709	2,283,639
Acquisition-related liabilities	0	0
Noncurrent operating lease liabilities	12,163	7,951
Other noncurrent liabilities	270,274	5,768
Total liabilities	4,615,598	5,284,716
Total member's interest	4,243,753	2,355,005
Total liabilities and members' interest	8,859,351	7,639,721
Summit Materials, LLC | Guarantors  | Reportable Legal Entities
Current assets:
Cash and cash equivalents	3,035	3,115
Restricted cash		0
Accounts receivable, net	433,440	255,836
Intercompany receivables	2,333,674	2,331,879
Cost and estimated earnings in excess of billings	10,722	9,228
Inventories	330,727	234,738
Other current assets	36,480	13,264
Total current assets	3,148,078	2,848,060
Property, plant and equipment, net	4,292,849	1,858,020
Goodwill	1,934,795	1,167,685
Intangible assets, net	175,298	63,655
Operating lease right-of-use assets	76,672	28,511
Other assets	280,725	235,719
Total assets	9,908,417	6,201,650
Current liabilities:
Current portion of debt	0	0
Current portion of acquisition-related liabilities	8,993	7,007
Accounts payable	249,732	111,061
Accrued expenses	90,021	82,065
Current operating lease liabilities	14,862	7,230
Intercompany payables	3,876,327	525,230
Billings in excess of costs and estimated earnings	5,495	7,280
Total current liabilities	4,245,430	739,873
Long-term debt	0	0
Acquisition-related liabilities	20,655	28,021
Noncurrent operating lease liabilities	63,140	21,587
Other noncurrent liabilities	318,398	196,759
Total liabilities	4,647,623	986,240
Total member's interest	5,260,794	5,215,410
Total liabilities and members' interest	9,908,417	6,201,650
Summit Materials, LLC | Non-Guarantors | Reportable Legal Entities
Current assets:
Cash and cash equivalents	41,760	44,899
Restricted cash		0
Accounts receivable, net	19,613	24,998
Intercompany receivables	0	0
Cost and estimated earnings in excess of billings	959	1,061
Inventories	7,774	6,612
Other current assets	2,364	645
Total current assets	72,470	78,215
Property, plant and equipment, net	80,736	82,988
Goodwill	56,687	58,176
Intangible assets, net	4,289	4,426
Operating lease right-of-use assets	4,040	4,293
Other assets	1,017	933
Total assets	219,239	229,031
Current liabilities:
Current portion of debt	0	0
Current portion of acquisition-related liabilities	0	0
Accounts payable	8,053	8,293
Accrued expenses	2,849	5,306
Current operating lease liabilities	554	562
Intercompany payables	1,704	4,095
Billings in excess of costs and estimated earnings	510	948
Total current liabilities	13,670	19,204
Long-term debt	0	0
Acquisition-related liabilities	0	0
Noncurrent operating lease liabilities	3,315	3,692
Other noncurrent liabilities	119,290	119,820
Total liabilities	136,275	142,716
Total member's interest	82,964	86,315
Total liabilities and members' interest	$ 219,239	$ 229,031

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
	Mar. 30, 2024	Apr. 01, 2023
Condensed Consolidating Statements of Operations
Total revenue	$ 805,015	$ 435,388
Cost of revenue (excluding items shown separately below)	624,011	354,037
Depreciation, depletion, amortization and accretion	95,971	50,894
Operating loss	(44,853)	(15,475)
(Gain) loss on sale of business	(14,985)	0
Loss from operations before taxes	(78,335)	(37,678)
Income tax benefit	(11,065)	(6,466)
Net loss attributable to Summit Inc.	(66,866)	(30,804)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	(70,451)	(30,643)
Summit Materials, LLC
Condensed Consolidating Statements of Operations
Total revenue	805,015	435,388
Cost of revenue (excluding items shown separately below)	624,011	354,037
General and administrative expenses	129,886	45,932
Depreciation, depletion, amortization and accretion	95,971	50,894
Operating loss	(44,853)	(15,475)
Other income, net	(3,234)	(5,217)
Interest expense	51,892	27,420
(Gain) loss on sale of business	(14,985)	0
Loss from operations before taxes	(78,526)	(37,678)
Income tax benefit	(196)	(467)
Net loss attributable to Summit Inc.	(78,330)	(37,211)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	(83,054)	(37,008)
Summit Materials, LLC | Eliminations
Condensed Consolidating Statements of Operations
Total revenue	(40,491)	(795)
Cost of revenue (excluding items shown separately below)	(40,491)	(795)
General and administrative expenses	0	0
Depreciation, depletion, amortization and accretion	0	0
Operating loss	0	0
Other income, net	43,110	14,715
Interest expense	0	0
(Gain) loss on sale of business	0	0
Loss from operations before taxes	(43,110)	(14,715)
Income tax benefit	0	0
Net loss attributable to Summit Inc.	(43,110)	(14,715)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	(47,834)	(14,512)
Issuers | Summit Materials, LLC | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Total revenue	0	0
Cost of revenue (excluding items shown separately below)	0	0
General and administrative expenses	49,110	15,221
Depreciation, depletion, amortization and accretion	1,846	988
Operating loss	(50,956)	(16,209)
Other income, net	(44,353)	(19,147)
Interest expense	70,951	39,845
(Gain) loss on sale of business	0	0
Loss from operations before taxes	(77,554)	(36,907)
Income tax benefit	776	304
Net loss attributable to Summit Inc.	(78,330)	(37,211)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	(83,054)	(37,008)
Guarantors  | Summit Materials, LLC | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Total revenue	823,366	408,422
Cost of revenue (excluding items shown separately below)	649,602	335,210
General and administrative expenses	79,117	28,947
Depreciation, depletion, amortization and accretion	91,191	47,153
Operating loss	3,456	(2,888)
Other income, net	(1,383)	(277)
Interest expense	(20,431)	(13,795)
(Gain) loss on sale of business	(14,985)	0
Loss from operations before taxes	40,255	11,184
Income tax benefit	(1,482)	(1,510)
Net loss attributable to Summit Inc.	41,737	12,694
Comprehensive (loss) income attributable to member of Summit Materials, LLC	41,737	12,694
Non-Guarantors | Summit Materials, LLC | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Total revenue	22,140	27,761
Cost of revenue (excluding items shown separately below)	14,900	19,622
General and administrative expenses	1,659	1,764
Depreciation, depletion, amortization and accretion	2,934	2,753
Operating loss	2,647	3,622
Other income, net	(608)	(508)
Interest expense	1,372	1,370
(Gain) loss on sale of business	0	0
Loss from operations before taxes	1,883	2,760
Income tax benefit	510	739
Net loss attributable to Summit Inc.	1,373	2,021
Comprehensive (loss) income attributable to member of Summit Materials, LLC	$ 6,097	$ 1,818

GUARANTOR AND NON-GUARANTOR F_5

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Schedule of Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Condensed Consolidating Statements of Operations
Net cash (used in) provided by operating activities	$ (40,245)	$ 335
Cash flows from investing activities:
Acquisitions, net of cash acquired	(1,100,919)	(55,477)
Purchase of property, plant and equipment	(58,519)	(63,584)
Proceeds from the sale of property, plant, and equipment	2,664	1,777
Proceeds from sale of businesses	75,993	0
Other	(1,240)	(1,045)
Net cash used in investing activities	(1,103,421)	(118,329)
Cash flows from financing activities:
Proceeds from debt issuances	1,007,475	0
Payments on long-term debt	(506,392)	(4,414)
Payments on acquisition-related liabilities	(6,124)	(11,374)
Debt issuance costs	(17,550)	(1,566)
Other	(9,260)	(5,719)
Net cash provided by (used in) financing activities	468,742	(23,058)
Impact of foreign currency on cash	(1,128)	58
Net decrease in cash and cash equivalents and restricted cash	(676,052)	(140,994)
Cash and cash equivalents and restricted cash—beginning of period	1,174,162	520,451
Cash and cash equivalents and restricted cash—end of period	498,110	379,457
Summit Materials, LLC
Condensed Consolidating Statements of Operations
Net cash (used in) provided by operating activities	(33,505)	335
Cash flows from investing activities:
Acquisitions, net of cash acquired	(1,100,919)	(55,477)
Purchase of property, plant and equipment	(58,519)	(63,584)
Proceeds from the sale of property, plant, and equipment	2,664	1,777
Proceeds from sale of businesses	75,993	0
Other	(22,640)
Other	(1,240)	(1,045)
Net cash used in investing activities	(1,103,421)	(118,329)
Cash flows from financing activities:
Capital distributions to member	593	15
Proceeds from debt issuances	1,007,475	0
Loans received from and payments made on loans from other Summit Companies	0	0
Payments on long-term debt	(506,392)	(4,414)
Payments on acquisition-related liabilities	(6,124)	(11,374)
Debt issuance costs	(17,550)	(1,566)
Other	(9,409)	(5,719)
Net cash provided by (used in) financing activities	468,593	(23,058)
Impact of foreign currency on cash	(1,128)	58
Net decrease in cash and cash equivalents and restricted cash	(669,461)	(140,994)
Cash and cash equivalents and restricted cash—beginning of period	1,155,669	520,451
Cash and cash equivalents and restricted cash—end of period	486,208	379,457
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
Other		0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Capital distributions to member	0	0
Proceeds from debt issuances	0
Loans received from and payments made on loans from other Summit Companies	(453)	3,548
Payments on long-term debt	0	0
Payments on acquisition-related liabilities	0	0
Debt issuance costs	0	0
Other	0	0
Net cash provided by (used in) financing activities	(453)	3,548
Impact of foreign currency on cash	0	0
Net decrease in cash and cash equivalents and restricted cash	(453)	3,548
Cash and cash equivalents and restricted cash—beginning of period	(2,755)	(7,018)
Cash and cash equivalents and restricted cash—end of period	(3,208)	(3,470)
Summit Materials, LLC | Issuers | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Net cash (used in) provided by operating activities	(22,707)	(55,528)
Cash flows from investing activities:
Acquisitions, net of cash acquired	97,153	0
Purchase of property, plant and equipment	(4,415)	(2,895)
Proceeds from the sale of property, plant, and equipment	0	0
Proceeds from sale of businesses	0
Other	0
Other		0
Net cash used in investing activities	92,738	(2,895)
Cash flows from financing activities:
Capital distributions to member	(52,015)	(55,870)
Proceeds from debt issuances	1,007,475
Loans received from and payments made on loans from other Summit Companies	(1,161,406)	(25,853)
Payments on long-term debt	(504,464)	(1,274)
Payments on acquisition-related liabilities	0	0
Debt issuance costs	(17,550)	(1,566)
Other	(7,860)	(2,740)
Net cash provided by (used in) financing activities	(735,820)	(87,303)
Impact of foreign currency on cash	0	0
Net decrease in cash and cash equivalents and restricted cash	(665,789)	(145,726)
Cash and cash equivalents and restricted cash—beginning of period	1,110,410	498,307
Cash and cash equivalents and restricted cash—end of period	444,621	352,581
Summit Materials, LLC | Guarantors  | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Net cash (used in) provided by operating activities	(14,571)	49,394
Cash flows from investing activities:
Acquisitions, net of cash acquired	(1,198,072)	(55,477)
Purchase of property, plant and equipment	(52,077)	(58,356)
Proceeds from the sale of property, plant, and equipment	2,662	1,777
Proceeds from sale of businesses	75,993
Other	(22,640)
Other		(1,045)
Net cash used in investing activities	(1,194,134)	(113,101)
Cash flows from financing activities:
Capital distributions to member	52,608	55,885
Proceeds from debt issuances	0
Loans received from and payments made on loans from other Summit Companies	1,165,362	24,951
Payments on long-term debt	(1,928)	(3,140)
Payments on acquisition-related liabilities	(6,124)	(11,374)
Debt issuance costs	0	0
Other	(1,293)	(2,766)
Net cash provided by (used in) financing activities	1,208,625	63,556
Impact of foreign currency on cash	0	0
Net decrease in cash and cash equivalents and restricted cash	(80)	(151)
Cash and cash equivalents and restricted cash—beginning of period	3,115	2,864
Cash and cash equivalents and restricted cash—end of period	3,035	2,713
Summit Materials, LLC | Non-Guarantors | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Net cash (used in) provided by operating activities	3,773	6,469
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	0
Purchase of property, plant and equipment	(2,027)	(2,333)
Proceeds from the sale of property, plant, and equipment	2	0
Proceeds from sale of businesses	0
Other	0
Other		0
Net cash used in investing activities	(2,025)	(2,333)
Cash flows from financing activities:
Capital distributions to member	0	0
Proceeds from debt issuances	0
Loans received from and payments made on loans from other Summit Companies	(3,503)	(2,646)
Payments on long-term debt	0	0
Payments on acquisition-related liabilities	0	0
Debt issuance costs	0	0
Other	(256)	(213)
Net cash provided by (used in) financing activities	(3,759)	(2,859)
Impact of foreign currency on cash	(1,128)	58
Net decrease in cash and cash equivalents and restricted cash	(3,139)	1,335
Cash and cash equivalents and restricted cash—beginning of period	44,899	26,298
Cash and cash equivalents and restricted cash—end of period	$ 41,760	$ 27,633