Continental Cement Company, L.L.C. S-4 28 Mar 14 Registration of securities issued in business combination transactions Financial data

Document_and_Entity_Informatio

Document and Entity Information	12 Months Ended
	Dec. 28, 2013
Document Information [Line Items]	'
Document Type	'S-4
Amendment Flag	'false
Document Period End Date	28-Dec-13
Entity Registrant Name	'Summit Materials, LLC
Entity Central Index Key	'0001571371
Entity Filer Category	'Non-accelerated Filer
Continental Cement Company, L.L.C. [Member]	'
Document Information [Line Items]	'
Document Type	'S-4
Amendment Flag	'false
Document Period End Date	28-Dec-13
Entity Registrant Name	'Continental Cement Company, L.L.C.
Entity Central Index Key	'0001571274
Entity Filer Category	'Non-accelerated Filer

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 28, 2013	Dec. 31, 2012	Dec. 29, 2012
In Thousands, unless otherwise specified
Current assets:	'	'	'
Cash	$14,917	'	$27,431
Accounts receivable, net	99,337	'	100,298
Costs and estimated earnings in excess of billings	10,767	'	11,575
Due from Affiliates	400	'	1,900
Inventories	96,432	'	92,977
Other current assets	13,181	'	10,068
Total current assets	234,634	'	242,349
Property, plant and equipment, net	831,778	'	813,607
Goodwill	127,038	'	179,120
Intangible assets, net	15,147	'	8,606
Other assets	39,197	'	37,531
Total assets	1,247,794	'	1,281,213
Current liabilities:	'	'	'
Current portion of debt	30,220	'	4,000
Current portion of acquisition-related liabilities	10,635	'	9,525
Accounts payable	72,104	'	61,634
Accrued expenses	57,251	'	49,822
Billings in excess of costs and estimated earnings	9,263	'	6,926
Total current liabilities	179,473	'	131,907
Long-term debt	658,767	'	635,843
Acquisition-related liabilities	23,756	'	23,919
Other noncurrent liabilities	77,480	'	84,266
Total liabilities	939,476	'	875,935
Commitments and contingencies	'	'	'
Redeemable noncontrolling interest	24,767	'	22,850
Member's interest:	'	'	'
Member's equity	486,896	'	484,584
Accumulated deficit	-198,511	'	-94,085
Accumulated other comprehensive loss	-6,045	'	-9,130
Member's interest	282,340	'	381,369
Noncontrolling interest	1,211	'	1,059
Total member's interest	283,551	'	382,428
Total liabilities, redeemable members' interest and member's interest	1,247,794	'	1,281,213
Continental Cement Company, L.L.C. [Member]	'	'	'
Current assets:	'	'	'
Cash	9	599	599
Accounts receivable, net	7,353	9,924	'
Due from Affiliates	2,990	10,303	'
Inventories	10,402	7,073	'
Other current assets	482	815	'
Total current assets	21,236	28,714	'
Property, plant and equipment, net	306,204	291,666	'
Goodwill	24,096	24,096	'
Other assets	12,576	11,447	'
Total assets	364,112	355,923	'
Current liabilities:	'	'	'
Current portion of debt	1,018	965	'
Accounts payable	10,165	7,248	'
Accrued expenses	9,997	11,523	'
Total current liabilities	21,180	19,736	'
Long-term debt	154,590	155,394	'
Pension and post-retirement benefit obligations	19,457	25,568	'
Other noncurrent liabilities	850	1,524	'
Total liabilities	196,077	202,222	'
Commitments and contingencies	'	'	'
Redeemable members' interest (100,000,000 Class B units issued and authorized)	23,450	22,850	'
Member's interest:	'	'	'
Member's equity	135,180	135,118	'
Accumulated deficit	17,029	7,764	'
Accumulated other comprehensive loss	-7,624	-12,031	'
Member's interest	144,585	130,851	'
Total liabilities, redeemable members' interest and member's interest	$364,112	$355,923	'

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 31, 2012	Dec. 31, 2011
				Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Revenue:	'	'	'	'	'	'
Product	$593,570	$588,762	$427,419	$64,181	$65,213	$57,804
Service	322,631	337,492	361,657	15,490	13,366	8,708
Revenue from related parties:	'	'	'	'	'	'
Product	600	7,900	8,600	16,578	16,303	12,269
Service	'	'	'	'	'	707
Total revenue	916,201	926,254	789,076	96,249	94,882	79,488
Cost of revenue (excluding items shown separately below):	'	'	'	'	'	'
Product	430,172	444,569	317,360	46,137	49,541	41,221
Service	246,880	268,777	280,294	9,105	8,778	6,500
Total cost of revenue	677,052	713,346	597,654	55,242	58,319	47,721
General and administrative expenses	142,000	127,215	95,826	8,367	6,706	4,761
Goodwill impairment	68,202	'	'	0	0	'
Depreciation, depletion, amortization and accretion	72,934	68,290	61,377	11,812	10,479	9,984
Transaction costs	3,990	1,988	9,120	'	'	'
Operating (loss) income	-47,977	15,415	25,099	20,828	19,378	17,022
Other (income) expense, net	-1,737	-1,182	-21,244	-90	131	-61
Loss on debt financings	3,115	9,469	'	'	'	'
Interest expense	56,443	58,079	47,784	11,053	12,622	14,621
(Loss) from continuing operations before taxes	-105,798	-50,951	-1,441	'	'	'
Income tax (benefit) expense	-2,647	-3,920	3,408	'	'	'
Loss from continuing operations	-103,151	-47,031	-4,849	'	'	'
Loss from discontinued operations	528	3,546	5,201	'	'	'
Net (loss) income	-103,679	-50,577	-10,050	9,865	6,625	2,462
Net income attributable to noncontrolling interest	3,112	1,919	695	'	'	'
Net loss attributable to member of Summit Materials, LLC	($106,791)	($52,496)	($10,745)	'	'	'

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive (Loss) Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 31, 2012	Dec. 31, 2011
				Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Net income (loss)	($103,679)	($50,577)	($10,050)	$9,865	$6,625	$2,462
Other comprehensive income (loss):	'	'	'	'	'	'
Pension and postretirement liability adjustment	4,407	-3,648	-5,675	4,407	-3,648	-5,675
Comprehensive income (loss)	-99,272	-54,225	-15,725	14,272	2,977	-3,213
Less comprehensive income (loss) attributable to the noncontrolling interest	4,434	824	-675	'	'	'
Comprehensive loss attributable to member of Summit Materials, LLC	($103,706)	($55,049)	($15,050)	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 31, 2012	Dec. 31, 2011
				Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Cash flow from operating activities:	'	'	'	'	'	'
Net income (loss)	($103,679)	($50,577)	($10,050)	$9,865	$6,625	$2,462
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'	'	'	'	'
Depreciation, depletion, amortization and accretion	75,927	72,179	64,983	'	'	'
Depreciation, depletion, amortization and accretion	72,934	68,290	61,377	11,812	10,479	9,984
Financing fee amortization	3,256	3,266	2,335	300	'	'
Share-based compensation expense	2,315	2,533	2,484	'	'	'
Deferred income tax benefit	-4,408	-3,468	-1,974	'	'	'
Net loss on asset disposals	12,419	2,564	2,349	'	'	'
Goodwill impairment	68,202	'	'	0	0	'
Bargain purchase gain	'	'	-12,133	'	'	'
Revaluation of asset retirement obligations	'	'	-3,420	'	'	'
Revaluation of contingent consideration	'	-409	-10,344	'	'	'
Loss on debt financings	2,989	9,469	'	'	'	'
Other	-1,098	-465	894	801	-78	308
Decrease (increase) in operating assets, net of acquisitions:	'	'	'	'	'	'
Account receivable	9,884	5,201	13,901	2,695	-1,924	-1,232
Inventories	499	-1,726	-12,643	-3,329	2,841	-3,191
Costs and estimated earnings in excess of billings	196	6,931	-613	'	'	'
Other current assets	-453	3,494	-4,823	333	58	-251
Other assets	-1,708	1,189	-1,016	-1,304	308	-2,872
Increase (decrease) in operating liabilities, net of acquisitions:	'	'	'	'	'	'
Accounts payable	4,067	-6,076	6,612	2,093	-907	865
Accrued expenses	-742	17,175	-6,455	-1,574	6,685	650
Billings in excess of costs and estimated earnings	1,998	2,589	-8,209	'	'	'
Pension and post-retirement benefit obligations	'	'	'	-1,704	-1,368	-1,644
Other liabilities	-3,252	-1,590	1,375	-1,099	-340	-48
Net cash provided by operating activities	66,412	62,279	23,253	18,589	22,379	5,031
Cash flow from investing activities:	'	'	'	'	'	'
Acquisitions, net of cash acquired	-61,601	-48,757	-161,073	'	'	'
Loans to and repayments from affiliates, net	'	'	'	7,118	-10,220	'
Purchases of property, plant and equipment	-65,999	-45,488	-38,656	-25,594	-12,805	-7,110
Proceeds from the sale of property, plant and equipment	16,085	8,836	7,157	3	69	168
Other	'	69	241	'	-79	'
Net cash used for investing activities	-111,515	-85,340	-192,331	-18,473	-23,035	-6,942
Cash flow from financing activities:	'	'	'	'	'	'
Capital contributions by member	'	'	103,630	'	'	'
Proceeds from borrowings	'	'	'	'	7,000	36,500
Net proceeds from debt issuance	230,817	713,361	96,748	'	'	'
Principal payments on long-term debt	'	'	'	-750	-5,783	-34,500
Payments on long-term debt	-188,424	-697,438	-49,000	'	'	'
Payments on acquisition-related liabilities	-9,801	-7,519	-4,593	'	'	'
Other	-3	-702	-10	44	-17	-43
Net cash (used for) provided by financing activities	32,589	7,702	146,775	-706	1,200	1,957
Net (decrease) increase in cash	-12,514	-15,359	-22,303	-590	544	46
Cash-beginning of period	27,431	42,790	65,093	599	55	9
Cash-end of period	$14,917	$27,431	$42,790	$9	$599	$55

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Redeemable Noncontrolling Interest and Member's Interest (USD $)

12 Months Ended

In Thousands, unless otherwise specified

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Redeemable Noncontrolling Interest [Member]

Redeemable Noncontrolling Interest [Member]

Redeemable Noncontrolling Interest [Member]

Member's Equity [Member]

Member's Equity [Member]

Member's Equity [Member]

Member's Equity [Member]

Member's Equity [Member]

Member's Equity [Member]

Accumulated Deficit [Member]

Accumulated Deficit [Member]

Accumulated Deficit [Member]

Accumulated Deficit [Member]

Accumulated Deficit [Member]

Accumulated Deficit [Member]

Accumulated Other Comprehensive Loss (AOCI) [Member]

Accumulated Other Comprehensive Loss (AOCI) [Member]

Accumulated Other Comprehensive Loss (AOCI) [Member]

Accumulated Other Comprehensive Loss (AOCI) [Member]

Accumulated Other Comprehensive Loss (AOCI) [Member]

Accumulated Other Comprehensive Loss (AOCI) [Member]

Noncontrolling Interest [Member]

Noncontrolling Interest [Member]

Noncontrolling Interest [Member]

Total Member's Interest [Member]

Total Member's Interest [Member]

Total Member's Interest [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Beginning Balance

'

'

'

'

'

'

$484,584

$482,707

$376,593

'

'

'

($94,085)

($40,932)

($29,555)

'

'

'

($9,130)

($6,577)

($2,272)

'

'

'

$1,059

$1,174

$1,227

$382,428

$436,372

$345,993

Beginning Balance

'

'

'

22,850

21,300

21,300

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Beginning balance, Redeemable members' interest

'

22,250

21,650

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accretion of redeemable members' interest

600

600

600

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Contributed capital

'

'

'

'

'

'

'

'

103,630

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

103,630

Other comprehensive income (loss)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ending balance, Redeemable members' interest

23,450

22,850

22,250

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Beginning balance

'

128,412

132,169

'

'

'

'

'

'

'

135,056

135,000

'

'

'

'

1,739

-123

'

'

'

'

-8,383

-2,708

'

'

'

'

'

'

Accretion / Redemption value adjustment

-600

-600

-600

-2,365

657

632

'

'

'

'

'

'

2,365

-657

-632

-600

-600

-600

'

'

'

'

'

'

'

'

'

2,365

-657

-632

Net (loss) income

9,865

6,625

2,462

2,960

1,988

738

'

'

'

'

'

'

-106,791

-52,496

-10,745

9,865

6,625

2,462

'

'

'

'

'

'

152

-69

-43

-106,639

-52,565

-10,788

Other comprehensive income (loss)

4,407

-3,648

-5,675

1,322

-1,095

-1,370

'

'

'

'

'

'

'

'

'

'

'

'

3,085

-2,553

-4,305

4,407

-3,648

-5,675

'

'

'

3,085

-2,553

-4,305

Repurchase of member's interest

'

'

'

'

'

'

-3

-656

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-3

-656

'

Share-based compensation

62

62

56

'

'

'

2,315

2,533

2,484

62

62

56

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,315

2,533

2,484

Payment of dividends

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-46

-10

'

-46

-10

Ending balance

144,585

130,851

128,412

'

'

'

'

'

'

135,180

135,118

135,056

'

'

'

17,029

7,764

1,739

'

'

'

-7,624

-12,031

-8,383

'

'

'

'

'

'

Ending Balance

'

'

'

'

'

'

486,896

484,584

482,707

'

'

'

-198,511

-94,085

-40,932

'

'

'

-6,045

-9,130

-6,577

'

'

'

1,211

1,059

1,174

283,551

382,428

436,372

Ending Balance

'

'

'

$24,767

$22,850

$21,300

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (Continental Cement Company, L.L.C. [Member])	Dec. 28, 2013	Dec. 31, 2012
Class B Units [Member]	'	'
Redeemable,Class B units issued	100,000,000	100,000,000
Redeemable, Class B units authorized	100,000,000	100,000,000
Class A Units [Member]	'	'
Member's equity, Class A units issued	100	100
Member's equity Class A units authorized	100	100

Summary_of_Organization_and_Si

Summary of Organization and Significant Accounting Policies

12 Months Ended

Dec. 28, 2013

Summary of Organization and Significant Accounting Policies

'

(1) Summary of Organization and Significant Accounting Policies

Summit Materials, LLC (“Summit Materials” or the “Company”) is a vertically-integrated, heavy building materials company. Across its subsidiaries, it is engaged in the manufacturing and sale of aggregates, cement, ready-mixed concrete and asphalt paving mix. It is also engaged in road paving and related construction services. Summit Materials owns and operates quarries, sand and gravel pits, a cement plant, cement distribution terminals, asphalt plants, ready–mixed concrete plants and landfill sites. The operations of Summit Materials are conducted primarily across 14 states, with the most significant portion of the Company’s revenue generated in Texas, Kansas, Kentucky, Missouri and Utah.

Summit Materials is a 100 percent-owned subsidiary of Summit Materials Holdings L.P. (“Parent”) whose major indirect owners are certain investment funds affiliated with Blackstone Capital Partners V L.P. (“BCP”). Summit Materials has a number of subsidiaries that have individually made a number of acquisitions through 2013. The Company is organized by geographic region and has three operating segments, which are also its reporting segments: the Central; West; and East regions.

Noncontrolling interests represent a 30% redeemable ownership in Continental Cement Company, L.L.C. (“Continental Cement”) and a 20% ownership in Ohio Valley Asphalt, LLC. In 2013, Continental Cement changed its fiscal year from a calendar year to a 52-week year with each quarter composed of 13 weeks ending on a Saturday, consistent with Summit Materials’ fiscal year. Continental Cement’s fiscal year end in 2013 was December 28 compared to the calendar year ended December 31 in 2012 and 2011. The effect of this change to Summit Materials’ financial position, results of operations and liquidity was immaterial.

Principles of Consolidation—The consolidated financial statements include the accounts of the Company and its majority owned subsidiaries. All intercompany balances and transactions have been eliminated. The Company attributes consolidated member’s interests and net income separately to the controlling and noncontrolling interests. The Company accounts for investments in entities for which it has an ownership of 20% to 50% using the equity method of accounting.

Use of Estimates—The consolidated financial statements of the Company have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”), which require management to make estimates and assumptions that affect the reported amounts and disclosures in the consolidated financial statements. 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, goodwill, intangible and other long-lived assets, pension and other postretirement obligations, asset retirement obligations and the redeemable noncontrolling interest. Estimates also include revenue earned and costs to complete open contracts. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management adjusts such estimates and assumptions when circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from estimates made. Changes in estimates, including those resulting from continuing changes in the economic environment, will be reflected in the Company’s consolidated financial statements in the period in which the change in estimate occurs.

Business and Credit Concentrations—The majority of Summit Materials’ customers are located in Texas, Kansas, Kentucky, Missouri and Utah. Summit Materials’ accounts receivable consist primarily of amounts due from customers within these areas. Collection of these accounts is, therefore, dependent on the economic conditions in the aforementioned states. However, credit granted within Summit Materials’ trade areas has been granted to a wide variety of customers. Management does not believe that any significant concentrations of credit exist with respect to individual customers or groups of customers. No single customer accounted for more than 10% of revenue in 2013, 2012 or 2011.

Accounts Receivable—Accounts receivable are stated at the amount management expects to collect from outstanding balances. Management provides for probable uncollectible amounts through a charge to earnings and a credit to a valuation allowance based on its assessment of the collectability of individual accounts. In establishing the allowance, management considers historical losses adjusted to take into account current market conditions and its customers’ financial condition, the amount of receivables in dispute, the current receivables aging and current payment terms. Balances that remain outstanding after reasonable collection efforts are exercised are written off through a charge to the valuation allowance.

The balances billed but not paid by customers, pursuant to retainage provisions included in contracts, will be due near or upon completion of the contracts.

Revenue and Cost Recognition—Revenue for product sales are recognized when evidence of an arrangement exists, the fee is fixed or determinable, title passes, which is generally when the product is shipped, and collection is reasonably assured. Product revenue includes sales of aggregates, cement and other materials to customers, net of discounts, allowances or taxes, as applicable. Internal product sales are eliminated from service revenue in the consolidated statements of operations.

Revenue from construction contracts are included in service revenue and are recognized under the percentage-of-completion accounting method. The percent complete is measured by the cost incurred to date compared to the estimated total cost of each project. This method is used as management considers expended cost to be the best available measure of progress on these contracts, the majority of which are completed within one year, but may occasionally extend beyond one year. Inherent uncertainties in estimating costs make it at least reasonably possible that the estimates used will change within the near term and over the life of the contracts.

Contract costs include all direct material and labor costs and those indirect costs related to contract performance and completion. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are estimable. General and administrative costs are charged to expense as incurred.

Changes in job performance, job conditions and estimated profitability, including those arising from contract penalty provisions and final contract settlements, may result in revisions to costs and income. Such revisions are recognized in the period in which they are determined. An amount equal to contract costs incurred that are attributable to claims is included in revenue when realization is probable and the amount can be reliably estimated.

Costs and estimated earnings in excess of billings are composed principally of revenue recognized on contracts (on the percentage-of-completion method) for which billings had not been presented to customers because the amount were not billable under the contract terms at the balance sheet date. In accordance with the contract terms, the unbilled receivables at December 28, 2013 will be billed in 2014. Billings in excess of costs and estimated earnings represent billings in excess of revenue recognized.

Revenue from the receipt of waste fuels is classified as service revenue and is based on fees charged for the waste disposal, which are recognized when the waste is accepted.

Inventories—Inventories consist of stone removed from quarries and processed for future sale, raw materials and finished concrete blocks. Inventories are valued at the lower of cost or market and are accounted for on a first-in first-out basis or an average cost basis. If items become obsolete or otherwise unusable or if quantities exceed what is projected to be sold within a reasonable period of time, they will be charged to costs of production in the period that the items are designated as obsolete or excess inventory. Stripping costs are costs of removing overburden and waste material to access aggregate materials and are recognized in cost of revenue in the same period as the revenue from the sale of the inventory.

Property, Plant and Equipment, net—Property, plant and equipment are recorded at cost, less accumulated depreciation, depletion and amortization. Expenditures for additions and improvements that significantly add to the productive capacity or extend the useful life of an asset are capitalized. Repair and maintenance costs that do not substantially add to the productive capacity or extend the useful life of the asset are expensed as incurred.

Landfill airspace is included in property, plant and equipment at cost and is amortized based on utilization of the asset. Management reassesses the landfill airspace capacity with any changes in value recorded in cost of revenue. Capitalized landfill costs include expenditures for the acquisition of land and related airspace, engineering and permitting costs, cell construction costs and direct site improvement costs.

Upon disposal, the cost and related accumulated depreciation are removed from the Company’s accounts and any gain or loss is included in general and administrative expenses.

Depreciation on property, plant and equipment, including assets subject to capital leases, is computed on a straight-line basis or based on the economic usage over the estimated useful life of the asset. The estimated useful lives are generally as follows:

Buildings and improvements

7–40 years

Plant, machinery and equipment

3–40 years

Truck and auto fleet

3–10 years

Mobile equipment and barges

3–20 years

Landfill airspace and improvements

5–60 years

Depletion of mineral reserves is calculated for proven and probable reserves by the units of production method on a site-by-site basis. Leasehold improvements are amortized on a straight-line basis over the lesser of the asset’s useful life or the remaining lease term.

The Company reviews the carrying value of property, plant and equipment for impairment whenever events or circumstances indicate that the carrying value of an asset may not be recoverable from the estimated future cash flows expected to result from its use and eventual disposition. Such indicators may include, among others, deterioration in general economic conditions, adverse changes in the markets in which an entity operates, increases in input costs that have a negative effect on earnings and cash flows or a trend of negative or declining cash flows over multiple periods. In addition, assets are assessed for impairment charges when identified for disposition. Projected losses from disposition are recognized in the period in which they become estimable, which may be in advance of the actual disposition. The net loss from asset dispositions recognized in general and administrative expenses in fiscal years 2013, 2012 and 2011 was $12.4 million, $2.6 million and $2.3 million, respectively. No material impairment charges have been recognized on assets held for use in 2013, 2012 or 2011. The losses are commonly a result of the cash flows expected from selling the asset being less than the expected cash flows that could be generated from holding the asset for use.

Accrued Mining and Landfill Reclamation—The mining reclamation reserve and financial commitments for landfill closure and post-closure activities are based on management’s estimate of future cost requirements to reclaim property at both currently operating and closed sites. Estimates of these obligations have been developed based on management’s interpretation of current requirements and proposed regulatory changes and are intended to approximate fair value. Costs are estimated in current dollars, inflated until the expected time of payment, using an inflation rate of 2.5%, and then discounted back to present value using a credit-adjusted, risk-free rate on obligations of similar maturity, adjusted to reflect the Company’s credit rating. Changes in the credit-adjusted, risk-free rate do not change recorded liabilities. However, subsequent increases in the recognized obligations are measured using a current credit-adjusted, risk-free rate. Decreases in the recognized obligations are measured at the initial credit-adjusted, risk-free rate.

Significant changes in inflation rates or the amount or timing of future cost estimates typically result in both (1) a current adjustment to the recorded liability (and corresponding adjustment to the asset) and (2) a change in accretion of the liability and depreciation of the asset to be recorded prospectively over the remaining capacity of the unmined quarry or landfill.

Intangible Assets—The Company’s intangible assets are primarily composed of lease agreements, reserve rights and trade names. The assets related to lease agreements are a result of the submarket royalty rates paid under agreements, primarily, for extracting aggregate. The values were determined as of the respective acquisition dates by a comparison of market-royalty rates to contract-royalty rates. The reserve rights relate to aggregate reserves to which the Company has the rights of ownership, but do not own the reserves. The intangible assets are amortized on a straight-line basis over the lives of the leases. Continental Cement’s trade name composes the majority of the remaining intangible assets. The following table shows intangible assets by type and in total:

December 28, 2013

December 29, 2012

Gross

Accumulated

Net

Gross

Accumulated

Net

Carrying

Amortization

Carrying

Carrying

Amortization

Carrying

Amount

Amount

Amount

Amount

Leases

$

10,430

$

(1,604

)

$

8,826

$

8,940

$

(1,092

)

$

7,848

Reserve rights

5,890

(221

)

5,669

—

—

—

Trade names

1,020

(368

)

652

1,020

(262

)

758

Total intangible assets

$

17,340

$

(2,193

)

$

15,147

$

9,960

$

(1,354

)

$

8,606

Amortization expense in 2013, 2012 and 2011 was $0.8 million, $0.6 million and $0.5 million, respectively. The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows:

2014

$

897

2015

897

2016

897

2017

893

2018

893

Thereafter

10,670

Total

$

15,147

Goodwill—Goodwill represents the purchase price paid in excess of the fair value of net tangible and intangible assets acquired. Goodwill recorded in connection with the Company’s acquisitions is primarily attributable to the expected profitability, assembled workforces of the acquired businesses and the synergies expected to arise after the Company’s acquisition of those businesses. Goodwill is not amortized, but is tested annually for impairment as of the first day of the fourth quarter and whenever events or circumstances indicate that goodwill may be impaired. The test for goodwill impairment is a two-step process to first identify potential goodwill impairment for each reporting unit and then, if necessary, measure the amount of the impairment loss. Goodwill is tested for impairment based on the Company’s operating companies, which management has determined to be the Company’s reporting units, which are one level below its segments in the Central and West regions. The East region is considered to be a single reporting unit.

Income Taxes—As a limited liability company, Summit Materials’ federal and state income tax attributes are generally passed to Parent. However, certain of the Company’s subsidiaries are taxable entities, the provisions for which are included in the consolidated financial statements. For the Company’s taxable entities, deferred income tax assets and liabilities are computed for differences between the tax basis and financial statement amounts that will result in taxable or deductible amounts in the future based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. A valuation allowance is recognized for deferred tax assets if it is more likely than not that some portion or all of the net deferred tax assets will not be realized.

The Company evaluates the tax positions taken on income tax returns that remain open to examination by the respective tax authorities from prior years and positions expected to be taken on the current year tax returns to identify uncertain tax positions. Interest and penalties are recorded in income tax expense.

Fair Value Measurements—The fair value accounting guidance establishes the following fair value hierarchy that prioritizes the inputs used to measure fair value:

Level 1

—

Unadjusted quoted prices for identical assets or liabilities in active markets.

Level 2

—

Inputs other than Level 1 that are based on observable market data, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in inactive markets, inputs that are observable that are not prices and inputs that are derived from or corroborated by observable markets.

Level 3

—

Valuations developed from unobservable data, reflecting the Company’s own assumptions, which market participants would use in pricing the asset or liability.

Assets and liabilities measured at fair value in the consolidated balance sheets as of year-end 2013 and 2012 are as follows:

2013

2012

Accrued expenses:

Current portion of contingent consideration

$

—

$

746

Acquisition- related liabilities

Contingent consideration

$

1,908

$

1,908

Certain acquisitions made by the Company require the payment of additional consideration contingent upon the achievement of specified operating results, referred to as contingent consideration or earn-out obligations. These payments will not be made if earn-out thresholds are not achieved. No material earn-out payments have been made to date.

Summit Materials records contingent consideration at fair value on the acquisition date and then measures its fair value each reporting period. Any adjustments to fair value are recognized in earnings in the period identified. Management of the Company determines the appropriate policies and procedures to be used when determining the fair value of contingent consideration. Its fair values are based on unobservable inputs, or Level 3 inputs, including projected probability-weighted cash payments and an 8.4% discount rate, which reflects the Company’s credit risk. 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 significantly lower, or higher, fair value measurement. In 2012 and 2011, we recognized reductions to contingent consideration of $0.4 million and $10.3 million, respectively, due primarily to revised estimates of the probability of achieving the specified targets.

Financial Instruments—The Company’s financial instruments include certain acquisition-related liabilities (deferred consideration and noncompete obligations) and debt. The fair value of the deferred consideration and noncompete obligations approximate their carrying value of $28.3 million and $4.2 million, respectively, as of December 28, 2013 and $23.4 million and $7.4 million, respectively, as of December 29, 2012. The fair value was determined based on Level 3 inputs, including the cash payment terms in the purchase agreements and a discount rate reflecting the Company’s credit risk.

The fair value of long-term debt was approximately $696.5 million and $670.7 million as of December 28, 2013 and December 29, 2012, respectively, compared to its carrying value of $663.0 million and $639.8 million, respectively. Fair value was determined based on Level 2 inputs, including observable inputs, specifically quoted prices for these instruments in inactive markets. The fair value of Company’s revolving credit facility approximated its carrying value of $26.0 million at December 28, 2013.

Reclassifications—Certain amounts have been reclassified in prior periods to conform to the presentation in the consolidated financial statements as of and for the year ended December 28, 2013.

Continental Cement Company, L.L.C. [Member]

'

Summary of Organization and Significant Accounting Policies

'

-1

Summary of Organization and Significant Accounting Policies

(a)

Business Activities and Organization

Continental Cement Company, L.L.C. (the “Company” or “Continental Cement”) produces Portland cement at its plant located in Hannibal, Missouri. Cement distribution terminals are maintained in Hannibal and St. Louis, Missouri and Bettendorf, Iowa. The Company’s primary customers are ready-mixed concrete and concrete products producers and contractors located in the Midwestern United States.

Green America Recycling, L.L.C. (“GAR”), a wholly owned subsidiary of the Company, is engaged in the business of securing, processing and blending hazardous and nonhazardous waste materials primarily for use as supplemental fuels in Continental Cement’s manufacturing process. GAR’s primary customers are commercial transportation disposal facilities and petroleum and chemical manufacturers located in the continental United States.

The Company, a Delaware limited liability company, is governed by the Amended and Restated Continental Cement Limited Liability Company Agreement (as amended, the “LLC Agreement”). As such, liability of the Company’s members is generally limited to the amount of their net investment in the Company. Continental Cement is an indirect non–wholly owned subsidiary of Summit Materials, LLC (“Summit Materials”).

In 2013, Continental Cement changed its fiscal year from a calendar year to a 52-week year with each quarter composed of 13 weeks ending on a Saturday, consistent with that of Summit Materials. Continental Cement’s fiscal year end in 2013 was December 28 compared to the calendar year ended December 31 in 2012 and 2011. The effect of this change to Continental Cement’s financial position, results of operations and liquidity was immaterial.

(b)

Principles of Consolidation

The consolidated financial statements of the Company include the accounts of Continental Cement and its wholly owned subsidiary, GAR. All significant intercompany balances and transactions have been eliminated.

(c)

Use of Estimates

The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), which require management to make estimates and assumptions that affect the reported amounts and disclosures in the consolidated financial statements. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and reported amounts of expenses. Such estimates include the valuation of accounts receivable, inventories, goodwill, intangible and other long-lived assets, pension and other postretirement obligations, asset retirement obligations and the redeemable members’ interest. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management adjusts such estimates and assumptions when circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from estimates made. Changes in estimates, including those resulting from continuing changes in the economic environment, will be reflected in the Company’s consolidated financial statements in the period in which the change in estimate occurs.

(d)

Business and Credit Concentrations

The Company’s customers are primarily located in Missouri, Iowa and Illinois. The Company’s accounts receivable balances are due primarily from ready-mixed concrete and concrete products producers and contractors within this area. Collection of these accounts is, therefore, dependent on the economic conditions of the area. However, credit granted within the Company’s trade area has been granted to a wide variety of customers, and management does not believe that any significant concentrations of credit exist with respect to individual customers or groups of customers who are engaged in similar activities that would be similarly affected by changes in economic or other conditions. The Company had approximately 16%, 13% and 14%, of cement sales with companies owned by a certain minority owner of the Company for the years ended December 28, 2013, December 31, 2012 and December 31, 2011, respectively.

(e)

Accounts Receivable

Accounts receivable is stated at the amount management expects to collect from outstanding balances. Management provides for probable uncollected amounts through a charge to earnings and a credit to the allowance for doubtful accounts based on its assessment of the status of individual accounts. In establishing the allowance, management considers historical losses adjusted to take into account current market conditions and the Company’s customers’ financial condition, the amount of receivables in dispute, the current receivables aging and current payment terms. Balances that are still outstanding after management has used reasonable collection efforts are written off through a charge to the allowance for doubtful accounts. Changes in the allowance for doubtful accounts have not been material to the consolidated financial statements.

(f)

Revenue Recognition

Revenue from the sale of cement is recognized when evidence of an arrangement exists, the fee is fixed or determinable, title passes, which is generally when the product is shipped, and collection is reasonably assured. Cement sales are recorded net of discounts, allowances and sales taxes, as applicable. The Company records freight revenue on a net basis together with freight costs within cost of sales.

Revenue from the receipt of waste fuels is recognized when the waste is accepted and a corresponding liability is recognized for the costs to process the waste into fuel for the manufacturing of cement or to ship the waste offsite for disposal in accordance with applicable regulations.

(g)

Inventories

Inventories of raw materials, work in process and finished goods are carried at the lower of cost (determined using the average cost method) or market. If items become obsolete or otherwise unusable, they will be charged to costs of production when that determination is made by management.

(h)

Property, Plant and Equipment, net

Property, plant and equipment are recorded at cost, less accumulated depreciation and depletion. Expenditures for additions and improvements that significantly add to the productive capacity or extend the useful life of an asset are capitalized. Repair and maintenance costs that do not substantially extend the life of the Company’s property, plant and equipment are expensed as incurred.

Upon disposal, the cost and related accumulated depreciation are removed from the Company’s accounts and any gain or loss is included in operating income.

Depreciation on property, plant and equipment is computed on a straight-line basis. These estimated useful lives are as follows:

Building and improvements

30 – 40 years

Plant, machinery and equipment

3 – 40 years

Mobile equipment and barges

3 – 20 years

Other

3 – 7 years

Depletion of mineral reserves is calculated over proven and probable reserves by the units of production method on a site-by-site basis.

The Company reviews the carrying value of property, plant and equipment for impairment whenever events or circumstances indicate that the carrying value of an asset may not be recoverable from the estimated future cash flows expected to result from its use and eventual disposition. Such indicators may include, among others, deterioration in general economic conditions, negative developments in equity and credit markets, adverse changes in the markets in which an entity operates, increases in input costs that have a negative effect on earnings and cash flows or a trend of negative or declining cash flows over multiple periods.

(i)

Accrued Mining Reclamation

The mining reclamation obligations are based on management’s estimate of future cost requirements to reclaim property at quarry sites. Estimates of these obligations have been developed based on management’s interpretation of current requirements and proposed regulatory changes and are intended to approximate fair value. Costs are estimated in current dollars, inflated until the expected time of payment, using an inflation rate of 2.5%, and then discounted back to present value using a risk-free rate on obligations of similar maturity, adjusted to reflect the Company’s credit rating. Changes in the credit-adjusted, risk-free rate do not change recorded liabilities. However, subsequent increases in the recognized obligations are measured using a current credit-adjusted, risk-free rate. Decreases in the recognized obligations are measured at the initial credit-adjusted, risk-free rate.

Significant changes in inflation rates or the amount or timing of future cost estimates typically result in both (1) a current adjustment to the recorded liability (and corresponding adjustment to the asset) and (2) a change in accretion of the liability and depreciation of the asset to be recorded prospectively over the remaining capacity of the unmined quarry.

(j)

Goodwill

Goodwill is the excess of cost over the fair value of net assets of businesses acquired and was $24.1 million as of December 28, 2013 and December 31, 2012. Goodwill is not amortized, but is tested annually for impairment and whenever events or circumstances change that would make it more likely than not that an impairment may have occurred.

Continental Cement performs an annual impairment analysis as of the first day of the fourth quarter of each fiscal year for its one reporting unit. The first step of the goodwill impairment test compares the fair value of the reporting unit to its carrying value. Management estimates the fair value of the reporting unit primarily based on the discounted projected cash flows of the underlying operations. A number of significant assumptions and estimates are required to forecast operating cash flows, including macroeconomic trends in the private construction and public infrastructure industries, expected success in securing future sales and the appropriate interest rate used to discount the projected cash flows. During the 2013 and 2012 annual reviews of goodwill, management concluded that the estimated fair value of the reporting unit was substantially in excess of its carrying value, resulting in no indication of impairment. The Company has recorded no goodwill impairment charges to date.

(k)

Income Taxes

Continental Cement and GAR are limited liability companies that pass their tax attributes for federal and state tax purposes to their members and are generally not subject to federal or state income tax.

(m)

Reclassifications

Certain amounts have been reclassified in prior periods to conform to the presentation in the consolidated financial statements as of and for the year ended December 28, 2013.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 28, 2013
Business Combinations [Abstract]	'
Acquisitions	'
	(2) Acquisitions
	The Company has acquired a number of entities since its formation in 2009, which were financed through a combination of debt and contributions from Parent. The operations of each acquisition have been included in the Company’s consolidated results of operations since the respective dates of the acquisitions. The Company measures all assets acquired and liabilities assumed at their acquisition-date fair value.
	2013 Acquisitions
	Central region
		•		On April 1, 2013, the Company acquired certain aggregates, ready-mixed concrete and asphalt assets of Lafarge North America, Inc. in and around Wichita, Kansas, with borrowings under the Company’s senior secured revolving credit facility.
	West region
		•		On April 1, 2013, the Company acquired all of the membership interests of Westroc, LLC, an aggregates and ready-mixed concrete provider near Salt Lake City, Utah, with borrowings under the Company’s senior secured revolving credit facility.
	2012 Acquisitions
	Central region
		•		On February 29, 2012, the Company acquired certain assets of Norris Quarries, LLC, an aggregates business in northwest Missouri, with proceeds from debt, including the Company’s senior secured revolving credit facility.
	West region
		•		On November 30, 2012, the Company acquired all of the stock of Sandco, Inc., an aggregates and ready-mixed concrete business in Colorado, with cash on-hand.
	East region
		•		On October 5, 2012, the Company acquired certain assets of Kay & Kay Contracting, LLC, an aggregates, asphalt and paving business in Kentucky, with cash on-hand.
	Pro Forma Financial Information—The following unaudited supplemental pro forma information presents the financial results as if the 2012 acquisitions occurred on January 1, 2011. This supplemental pro forma information has been prepared for comparative purposes and does not purport to be indicative of what would have occurred had the acquisitions been made on January 1, 2011, nor is it indicative of any future results. The 2013 acquisitions were not material individually or in the aggregate.
			Year ended
			December 28, 2013			December 29, 2012
	Revenue		$	916,201		$	976,797
	Net loss			(103,679	)		(45,976	)
	The purchase price allocation for the 2012 and 2013 acquisitions has been finalized. The following table summarizes aggregated information regarding the fair values of the assets acquired and liabilities assumed as of the respective acquisition dates in 2013 and 2012:
			2013			2012
	Financial assets		$	8,302		$	1,397
	Inventories			3,954			6,988
	Property, plant and equipment			40,580			21,543
	Other assets			52			1,330
	Intangible assets(1)			7,428			3,172
	Financial liabilities			(6,164	)		(944	)
	Other long-term liabilities			(1,050	)		(364	)
	Net assets acquired			53,102			33,122
	Goodwill			16,120			26,230
	Total purchase price			69,222			59,352
	Noncash transactions:
	Acquisition related liabilities			(7,902	)		(10,547	)
	Other			281			(48	)
	Total noncash transactions			(7,621	)		(10,595	)
	Net cash paid for acquisitions		$	61,601		$	48,757
	-1	Intangible assets acquired relate to aggregate reserves to which the Company has the rights of ownership, but do not own the reserves ($5.9 million) and the differential between contractual lease rates and market rates for leases of aggregate reserves and office space. The acquired intangible assets in total, the reserve rights and the lease assets have weighted-average lives of 18 years, 20 years and 11 years, respectively.

Goodwill

Goodwill	12 Months Ended
	Dec. 28, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill	'
	(3) Goodwill
	The Company had eight reporting units with goodwill for which the annual goodwill impairment test was completed. The first step of the goodwill impairment test employed by the Company compares the fair value of the reporting units to their carrying values. Management estimates the fair value of the reporting units primarily based on the discounted projected cash flows of the underlying operations. A number of significant assumptions and estimates are required to forecast operating cash flows, including macroeconomic trends in the public infrastructure and private construction industry, the timing of work embedded in backlog, performance and profitability under contracts, expected success in securing future sales and the appropriate interest rate used to discount the projected cash flows. These assumptions may vary significantly among the reporting units. This discounted cash flow analysis is corroborated by “top-down” analyses, including a market assessment of the Company’s enterprise value.
	During the annual test performed as of the first day of the fourth quarter of 2013, management concluded that the estimated fair value of the Utah-based operations in the West region and the East region were less than their carrying values. The estimated fair value of these operating units was estimated by applying a 50 percent weighting to both the discounted cash flow valuation and the market assessment, a discount rate of 11.0% and internal growth projections.
	The second step of the test requires the allocation of the reporting unit’s fair value to its assets and liabilities, including any unrecognized intangible assets, in a hypothetical analysis that calculates the implied fair value of goodwill as if the reporting unit was being acquired in a business combination. If the implied fair value of goodwill is less than the carrying value, the difference is recorded as an impairment loss. Based on the step two analysis, goodwill impairment charges recognized in the year ended December 28, 2013 was $68.2 million, as a result of current uncertainties in the timing of a sustained recovery in the Utah and Kentucky construction markets. No impairment charges were recognized prior to 2013.
	The following table presents goodwill by reportable segments and in total:
		Central		West			East			Total
	Beginning Balance—December 31, 2011	$	53,585	$	91,598		$	8,192		$	153,375
	Acquisitions		19,204		(205	)		6,746			25,745
	Balance, December 29, 2012		72,789		91,393			14,938			179,120
	Acquisitions		—		16,120			—			16,120
	Impairment		—		(53,264	)		(14,938	)		(68,202	)
	Balance, December 28, 2013	$	72,789	$	54,249		$	—		$	127,038

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Dec. 28, 2013
Discontinued Operations And Disposal Groups [Abstract]	'
Discontinued Operations	'
	(4) Discontinued Operations
	The Company’s discontinued operations include a railroad construction and repair business (referred to herein as railroad), environmental remediation operations and certain concrete paving operations. The railroad business involved building and repairing railroad sidings. The environmental remediation operations primarily involved the repair of retaining walls along highways in Kentucky and the removal and remediation of underground fuel storage tanks. The railroad and environmental remediation operations were sold in 2012 in separate transactions for aggregate proceeds of $3.1 million. The concrete paving operations were wound down in the second quarter of 2013 and, as of March 7, 2014, all assets have been sold. The results of these operations have been removed from the results of continuing operations for all periods presented. Prior to recognition as discontinued operations, all of these businesses were included in the East region’s operations.
	Debt and interest expense were not allocated to these businesses since there was no debt specifically attributable to the operations. The discontinued businesses are organized within a limited liability company that 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. The railroad, environmental remediation and concrete paving businesses’ revenue and loss before income tax expense, including an immaterial gain on sale, in fiscal years 2013, 2012 and 2011 are summarized below:
		2013		2012		2011
	Total revenue	$	3,884	$	50,152	$	49,537
	Loss from discontinued operations before income tax expense		528		3,546		5,201

Accounts_Receivable_Net

Accounts Receivable, Net	12 Months Ended
	Dec. 28, 2013
Accounts Receivable, net	'
	(5) Accounts Receivable, Net
	Accounts receivable, net consists of the following as of year-end 2013 and 2012:
			2013			2012
	Trade accounts receivable		$	85,188		$	88,637
	Retention receivables			15,966			13,181
	Receivables from related parties			202			1,871
	Accounts receivable			101,356			103,689
	Less: Allowance for doubtful accounts			(2,019	)		(3,391	)
	Accounts receivable, net		$	99,337		$	100,298
	Retention receivables are amounts earned by the Company, but held by customers until projects have been fully completed or near completion. Amounts are expected to be billed and collected within a year.
Continental Cement Company, L.L.C. [Member]	'
Accounts Receivable, net	'
	-2	Accounts Receivable, net
	Accounts receivable, net consists of the following as of year-end 2013 and 2012:
			2013			2012
	Trade accounts receivable from unaffiliated entities		$	6,961		$	8,859
	Trade accounts receivable from related parties			422			1,193
	Accounts receivable			7,383			10,052
	Less: allowance for doubtful accounts			(30	)		(128	)
	Accounts receivable, net		$	7,353		$	9,924

Inventories

Inventories	12 Months Ended
	Dec. 28, 2013
Inventories	'
	(6) Inventories
	Inventories consist of the following as of year-end 2013 and 2012:
			2013		2012
	Aggregate stockpiles		$	70,300	$	62,872
	Finished goods			11,207		9,342
	Work in process			2,623		2,679
	Raw materials			12,302		18,084
	Total		$	96,432	$	92,977
Continental Cement Company, L.L.C. [Member]	'
Inventories	'
	-3	Inventories
	Inventories consist of the following as of year-end 2013 and 2012:
			2013		2012
	Raw materials		$	972	$	475
	Work-in-process			2,623		2,248
	Finished goods			6,807		4,350
	Total inventories		$	10,402	$	7,073

Property_Plant_and_Equipment_n

Property, Plant and Equipment, net	12 Months Ended
	Dec. 28, 2013
Property, Plant and Equipment, net	'
	(7) Property, Plant and Equipment, net
	Property, plant and equipment, net consist of the following as of year-end 2013 and 2012:
			2013			2012
	Land (mineral bearing) and asset retirement costs		$	107,007		$	106,135
	Land (non-mineral bearing)			81,331			69,560
	Buildings and improvements			77,535			78,168
	Plants, machinery and equipment			680,942			623,949
	Truck and auto fleet			19,165			19,399
	Landfill airspace and improvements			46,841			46,841
	Construction in progress			29,560			20,734
	Other			1,779			5,134
	Property, plant and equipment			1,044,160			969,920
	Less accumulated depreciation, depletion and amortization			(212,382	)		(156,313	)
	Property, plant and equipment, net		$	831,778		$	813,607
	Depreciation, depletion and amortization expense of property, plant and equipment was $71.4 million, $68.6 million and $61.8 million for the years ended December 28, 2013, December 29, 2012 and December 31, 2011, respectively.
	Property, plant and equipment at year-end 2013 and 2012 include $11.3 million (net of $1.3 million accumulated amortization) and $3.1 million (net of $0.2 million accumulated amortization), respectively, of capital leases for certain equipment and a building. Approximately $2.1 million of the future obligations associated with the capital leases are included in accrued expenses and the present value of the remaining capital lease payments is included in other noncurrent liabilities on the consolidated balance sheets. Future minimum rental commitments under long-term capital leases are $2.1 million, $1.1 million, $2.9 million, $0.4 million and $0.4 million for the years ended 2014, 2015, 2016, 2017 and 2018, respectively.
Continental Cement Company, L.L.C. [Member]	'
Property, Plant and Equipment, net	'
	-4	Property, Plant and Equipment, net
	Property, plant and equipment, net consist of the following as of year-end 2013 and 2012:
			2013			2012
	Land (non-mineral bearing)		$	4,605		$	4,605
	Land (mineral bearing) and asset retirement costs			16,524			15,449
	Buildings and improvements			40,795			40,681
	Plants, machinery and equipment			247,681			231,454
	Mobile equipment and barges			8,060			7,859
	Construction in progress			23,394			15,301
	Other			1,845			1,373
	Property, plant and equipment			342,904			316,722
	Less accumulated depreciation, depletion and amortization			(36,700	)		(25,056	)
	Property, plant and equipment, net		$	306,204		$	291,666
	The Company is developing an underground mine through which over 200 years of limestone reserves may be accessed. Limestone is a raw material used in the production of cement. As of year-end 2013 and 2012, the underground mine development costs included in construction in progress totaled $22.9 million and $6.6 million, respectively. Costs for mine development are capitalized and include costs incurred for site preparation and development of the mine.
	Depreciation and depletion expense of property, plant and equipment was $11.6 million, $10.3 million and $9.8 million, for the years ended December 28, 2013, December 31, 2012 and December 31, 2011, respectively.

Debt

Debt	12 Months Ended
	Dec. 28, 2013
Debt Disclosure [Abstract]	'
Debt	'
	(8) Debt
	Debt as of year-end 2013 and 2012 are summarized as follows:
		2013			2012
	Senior secured credit facility, revolver due 2017	$	26,000		$	—
	Long-term debt:
	$250.0 million senior notes, net of discount of $4.0 million at December 28, 2013 and $4.7 million at December 29, 2012	$	245,971		$	245,303
	$419.9 million senior secured credit facility, term loan net of discount of $2.9 million at December 28, 2013 and $3.5 million at December 29, 2012		417,016			394,540
	Total		662,987			639,843
	Current portion of long-term debt		4,220			4,000
	Long-term debt	$	658,767		$	635,843
	Accrued interest expense on long-term debt as of year-end 2013 and 2012 was $17.1 million and $19.7 million, respectively, and is included in accrued expenses on the consolidated balance sheets.
	The total contractual payments of long-term debt for the five years subsequent to December 28, 2013 are as follows:
	2014	$	4,220
	2015		4,220
	2016		5,275
	2017		4,220
	2018		3,165
	Thereafter		648,790
	Total		669,890
	Less: Original issue discount		(6,903	)
	Total debt	$	662,987
	Summit Materials and Summit Materials Finance Corp. issued $250.0 million aggregate principal amount of 10.5% Senior Notes due January 31, 2020 (“Senior Notes”) under an indenture dated January 30, 2012 (as amended and supplemented, the “Indenture”). In addition to the Senior Notes, the Company has a credit facility which provides for term loans in an aggregate amount of $422.0 million and revolving credit commitments in an aggregate amount of $150.0 million (the “Senior Secured Credit Facility”). The debt was initially issued with an original issuance discount of $9.5 million, which was recorded as a reduction to debt and is being accreted as interest expense over the term of the debt. As a result of these transactions, $9.5 million of financing fees were charged to earnings in the year ended December 29, 2012.
	Senior Notes—The Senior Notes bear interest at 10.5% per year, payable semi-annually in arrears; interest payments commenced on July 31, 2012. The Indenture contains covenants limiting, among other things, the Company 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 the Company’s assets, enter into certain transactions with affiliates, and designate subsidiaries as unrestricted subsidiaries. The Indenture also contains customary events of default.
	Senior Secured Credit Facility—Under the Senior Secured Credit Facility, the Company has entered into term loans totaling $422.0 million with required principal repayments of 0.25% of term debt due on the last business day of each March, June, September and December. In February 2013, the Company consummated a repricing, which included additional borrowings of $25.0 million, an interest rate reduction of 1.0% and a deferral of the March 2013 principal payment. The unpaid principal balance is due in full on the maturity date, which is January 30, 2019. As a result of this repricing, $3.1 million of financing fees were charged to earnings in the year ended December 28, 2013.
	Our senior secured credit facilities include an uncommitted incremental facility that will allow us the option to increase the amount available under the term loan facility and/or the senior secured revolving credit facility by (i) $135.0 million plus (ii) an additional amount so long as we are in pro forma compliance with a consolidated first lien net leverage ratio. The term loans bear interest per annum equal to, at the Company’s option, either (i) a base rate determined by reference to the highest of (a) the federal funds rate plus 0.50%, (b) the prime rate of Bank of America, N.A. and (c) the British Bankers Association London Interbank Offered Rate (“LIBOR”) plus 1.00%, subject to a base rate floor of 2.25%, plus an applicable margin of 2.75% for base rate loans, or (ii) a LIBOR rate determined by reference to Reuters prior to the interest period relevant to such borrowing adjusted for certain additional costs, subject to a LIBOR floor of 1.25% plus an applicable margin of 3.75% for LIBOR rate loans. The interest rate in effect at December 28, 2013 was 5.0%.
	Under the Senior Secured Credit Facility, the Company has revolving credit commitments of $150.0 million. The revolving credit facility matures on January 30, 2017 and bears interest per annum equal to, at the Company’s option, either (i) a base rate determined by reference to the highest of (a) the federal funds rate plus 0.50%, (b) the prime rate of Bank of America, N.A. and (c) LIBOR plus 1.00%, plus an applicable margin of 2.5% for base rate loans or (ii) a LIBOR rate determined by reference to Reuters prior to the interest period relevant to such borrowing adjusted for certain additional costs plus an applicable margin of 3.5% for LIBOR rate loans. The interest rate in effect at December 28, 2013 was 4.4%.
	There was $26.0 million outstanding under the revolver facility as of December 28, 2013, leaving remaining borrowing capacity of $105.7 million, which is net of $18.3 million of outstanding letters of credit. The outstanding letters of credit are renewed annually and support required bonding on construction projects and the Company’s insurance liabilities.
	The Company must adhere to certain financial covenants related to its debt and interest leverage ratios, as defined in the Senior Secured Credit Facility. The consolidated first lien net leverage ratio, reported each quarter, should be no greater than 4.75:1.0 from January 1, 2013 through June 30, 2014; 4.50:1.0 from July 1, 2014 through June 30, 2015, and 4.25:1.0 thereafter. The interest coverage ratio must be at least 1.70:1.0 from January 1, 2013 through December 31, 2014 and 1.85:1.0 thereafter.
	As of December 28, 2013 and December 29, 2012, the Company was in compliance with all covenants. The Company’s 100 percent-owned subsidiary companies and its non wholly-owned subsidiary, Continental Cement, subject to certain exclusions and exceptions are named as subsidiary guarantors of the Senior Notes and the Senior Secured Credit Facility. In addition, the Company has pledged substantially all of its assets as collateral, subject to certain exclusions and exceptions, for the Senior Secured Credit Facility.
	As of December 28, 2013 and December 29, 2012, $11.5 million and $12.6 million, respectively, of deferred financing fees were being amortized over the term of the debt using the effective interest method.

Members_Interest

Member's Interest	12 Months Ended
	Dec. 28, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Member's Interest	'
	(9) Member’s Interest
	The Company’s membership interests are held by Parent. Business affairs of the Company are managed by the Board of Directors (“Board”) of Summit Materials Holdings, GP, Ltd., the general partner of Parent, which, as of December 28, 2013, was composed of six directors. Directors of the Board are appointed by the unit holders of Parent, which is the indirect sole member of the Company.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 28, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	(10) Income Taxes
	For the years ended 2013, 2012 and 2011, income taxes consist of the following:
		2013			2012			2011
	Provision for income taxes:
	Current	$	1,761		$	(452	)	$	5,382
	Deferred		(4,408	)		(3,468	)		(1,974	)
	Income tax (benefit) expense	$	(2,647	)	$	(3,920	)	$	3,408
	The effective tax rate on pre-tax income differs from the U.S. statutory rate due to the following:
		2013			2012			2011
	Income tax benefit at federal statutory tax rate	$	(37,160	)	$	(19,074	)	$	(6,895	)
	Book loss not subject to income tax		32,801			16,167			13,790
	State and local income taxes		130			(90	)		666
	Depletion expense		(411	)		(377	)		(372	)
	Domestic production activities deduction		—			—			(273	)
	Goodwill impairment		1,046			—			—
	Bargain purchase gain		—			—			(4,250	)
	Effective rate change		—			(532	)		627
	Valuation allowance		729			36			(360	)
	Other		218			(50	)		475
	Income tax (benefit) provision	$	(2,647	)	$	(3,920	)	$	3,408
	The following table summarizes the components of the net deferred income tax liability as of year-end 2013 and 2012:
		2013			2012
	Deferred tax assets (liabilities):
	Mining reclamation reserve	$	1,502		$	1,449
	Accelerated depreciation		(33,146	)		(34,733	)
	Net operating loss		2,227			2,134
	Capital losses on securities		997			989
	Landfill closure reserve		(63	)		(30	)
	Working capital (e.g., accrued compensation, prepaid assets)		2,399			3,101
	Deferred tax liabilities, net		(26,084	)		(27,090	)
	Less valuation allowance on loss carryforwards		(1,826	)		(1,025	)
	Total	$	(27,910	)	$	(28,115	)
	Included in accompanying consolidated balance sheets under the following captions:
	Other current assets	$	2,316		$	2,275
	Other noncurrent liability		(30,226	)		(30,390	)
	Total	$	(27,910	)	$	(28,115	)
	In assessing the realizability of deferred tax assets as of year-end 2013 and 2012, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible (including the effect of available carryback and carryforward periods), projected future taxable income and tax-planning strategies in making this assessment. Management anticipates the deferred income tax asset related to losses on securities and net operating losses will not be fully utilized before their expiration in 2014; therefore, a valuation allowance has been recorded as of year-end 2013 and 2012. In 2011, $0.8 million of capital loss was carried back for a tax benefit recovery of $0.3 million. The remaining capital loss of $1.0 million is not expected to be utilized; therefore, the remaining balance has been fully reserved in the valuation allowance as of year-end 2013. At December 28, 2013, the Company has net operating loss carryforwards for federal and state income tax purposes of $5.2 million and $0.7 million, respectively, which are available to offset future federal and state taxable income, if any, through 2033.
	Summit Materials does not have any uncertain tax positions as of December 28, 2013. Tax years from 2010 to 2013 remain open and subject to audit by federal and state tax authorities. No income tax expense or benefit was recognized in other comprehensive loss in 2013, 2012 or 2011.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 28, 2013
Employee Benefit Plans	'
	(11) Employee Benefit Plans
	Deferred Compensation Plan—The Company sponsors employee 401(k) savings plans for all salaried employees and certain union employees. The plans provide for various required and discretionary Company matches of employees’ eligible compensation contributed to the plans. The expense for all defined contribution plans amounted to $2.3 million, $2.2 million and $1.9 million for the years ended December 28, 2013, December 29, 2012 and December 31, 2011, respectively.
	Defined Benefit and Other Postretirement Benefits Plans—The Company’s subsidiary, Continental Cement, sponsors two noncontributory defined benefit pension plans for hourly and salaried employees. The salaried employee pension plan was closed to new participants and frozen in January 2000 and the hourly employee pension plan was closed to new participants in May 2003 and frozen in January 2014. Pension benefits for certain eligible hourly employees are based on a monthly pension factor for each year of credited service. Pension benefits for certain eligible salaried employees are generally based on years of service and average eligible compensation.
	Continental Cement also sponsors unfunded healthcare and life insurance benefits plan for certain eligible retired employees. Effective January 1, 2012, the Company eliminated all future retiree health and life coverage for active salaried, nonunion hourly and certain union employees that retire on or after January 1, 2012. Effective January 1, 2014, the plan was amended to eliminate all future retiree health and life coverage for the remaining union employees.
	The funded status of the pension and other postretirement benefit plans is recognized in the consolidated balance sheets as the difference between the fair value of plan assets and the benefit obligations. For defined benefit pension plans, the benefit obligation is the projected benefit obligation (“PBO”) and for the other postretirement benefit plans, the benefit obligation is the accumulated postretirement benefit obligation (“APBO”). The PBO represents the actuarial present value of benefits expected to be paid upon retirement based on estimated future compensation levels. However, since the plans’ participants are not subject to future compensation increases, the plans’ PBO equals the APBO. The APBO represents the actuarial present value of postretirement benefits attributed to employee services already rendered. The fair value of plan assets represents the current market value of assets held by an irrevocable trust fund for the sole benefit of participants. The measurement of the benefit obligations are based on the Company’s estimates and actuarial valuations. These valuations reflect the terms of the plan and use participant-specific information, such as compensation, age and years of service, as well as certain assumptions that require significant judgment, including estimates of discount rates, expected return on plan assets, rate of compensation increases, interest-crediting rates and mortality rates.
	The Company uses its fiscal year-end as the measurement date for its defined benefit pension and other postretirement benefit plans.
	Obligations and Funded Status—The following information is as of year-end 2013 and 2012 and for the years ended December 28, 2013, December 29, 2012 and December 31, 2011:
			2013							2012
			Pension			Other				Pension			Other
			benefits			benefits				benefits			benefits
	Change in benefit obligations:
	Beginning of period		$	28,674		$	15,810			$	26,514		$	14,467
	Service cost			295			236				276			207
	Interest cost			963			513				1,055			585
	Actuarial (gain) loss			(2,674	)		(1,048	)			2,347			1,597
	Special termination benefits			—			39				—			—
	Benefits paid			(1,614	)		(1,395	)			(1,518	)		(1,046	)
	End of period			25,644			14,155				28,674			15,810
	Change in fair value of plan assets:
	Beginning of period			17,863			—				16,639			—
	Actual return on plan assets			1,512			—				1,205			—
	Employer contributions			1,313			1,395				1,537			1,046
	Benefits paid			(1,614	)		(1,395	)			(1,518	)		(1,046	)
	End of period			19,074			—				17,863			—
	Funded status of plans		$	(6,570	)	$	(14,155	)		$	(10,811	)	$	(15,810	)
	Current liabilities		$	—		$	(1,268	)		$	—		$	(1,055	)
	Noncurrent liabilities			(6,570	)		(12,887	)			(10,811	)		(14,755	)
	Liability recognized		$	(6,570	)	$	(14,155	)		$	(10,811	)	$	(15,810	)
	Amounts recognized in accumulated other comprehensive income:
	Net actuarial loss		$	4,831		$	4,139			$	8,056		$	5,501
	Prior service cost			—			(1,346	)			—			(1,526	)
	Total amount recognized		$	4,831		$	2,793			$	8,056		$	3,975
	The amount recognized in accumulated other comprehensive income (“AOCI”) is the actuarial loss and prior service cost, which has not yet been recognized in periodic benefit cost, adjusted for amounts allocated to the redeemable noncontrolling interest. At December 28, 2013, the actuarial loss expected to be amortized from AOCI to periodic benefit cost in 2014 is $0.1 million and $0.2 million for the pension and postretirement obligations, respectively.
			2013							2012						2011
			Pension			Other				Pension			Other			Pension			Other
			benefits			benefits				benefits			benefits			benefits			benefits
	Amounts recognized in other comprehensive (gain) loss:
	Net actuarial (gain) loss		$	(2,838	)	$	(1,048	)		$	2,444		$	1,597		$	4,066		$	3,390
	Prior service cost			—			180				—			—			—			(1,705	)
	Amortization of prior year service cost			—			—				—			180			—			—
	Amortization of (gain) loss			(387	)		(314	)			(261	)		(312	)		(5	)		(71	)
	Total amount recognized		$	(3,225	)	$	(1,182	)		$	2,183		$	1,465		$	4,061		$	1,614
	Components of net periodic benefit cost:
	Service cost		$	295		$	236			$	276		$	207		$	275		$	227
	Interest cost			963			513				1,055			585			1,161			710
	Amortization of loss			387			314				262			312			5			69
	Expected return on plan assets			(1,348	)		—				(1,301	)		(180	)		(1,400	)		—
	Special termination benefits			—			39				—			—			—			—
	Amortization of prior service credit			—			(180	)			—			—			—			—
	Net periodic benefit cost		$	297		$	922			$	292		$	924		$	41		$	1,006
	Assumptions—Weighted-average assumptions used to determine the benefit obligations as of year-end 2013 and 2012 are:
			2013			2012
			Pension		Other	Pension		Other
			benefits		benefits	benefits		benefits
	Discount rate		4.21% - 4.46%		4.33%	3.30% - 3.57%		3.41%
	Expected long-term rate of return on plan assets		7.50%		N/A	7.50%		N/A
	Weighted-average assumptions used to determine net periodic benefit cost for years ended December 28, 2013, December 29, 2012 and December 31, 2011:
			2013			2012				2011
			Pension		Other	Pension		Other		Pension		Other
			benefits		benefits	benefits		benefits		benefits		benefits
	Discount rate		3.30% - 3.57%		3.41%	3.89% - 4.07%		4.00%		4.94% - 5.12.%		5.07%
	Expected long-term rate of return on plan assets		7.50%		N/A	7.50%		N/A		8.50%		N/A
	The expected long-term return on plan assets is based upon the Plans’ consideration of historical and forward-looking returns and the Company’s estimation of what a portfolio, with the target allocation described below, will earn over a long-term horizon. The discount rate is derived using the Citigroup Pension Discount Curve.
Assumed health care cost trend rates are 9% grading to 7% and 9% grading to 7% as of year-end 2013 and 2012, respectively. Assumed health care cost trend rates have a significant effect on the amounts reported for the Company’s post retirement medical and life plans. A one percentage-point change in assumed health care cost trend rates would have the following effects as of year-end 2013 and 2012:
		2013							2012
		Increase			Decrease				Increase			Decrease
Total service cost and interest cost components		$	66		$	(55	)		$	73		$	(63	)
Estimated APBO			1,251			(1,073	)			1,555			(1,331	)
Plan Assets—The defined benefit pension plans’ (the “Plans”) investment strategy is to minimize investment risk while generating acceptable returns. The Plans currently invest a relatively high proportion of the plan assets in fixed income securities, while the remainder is invested in equity securities, cash reserves and precious metals. The equity securities are diversified into funds with growth and value investment strategies. The target allocation for plan assets is as follows: equity securities – 30%; fixed income securities –63%; cash reserves –5%; and precious metals –2%. The Plans’ current investment allocations are within the tolerance of the target allocation. The Company had no Level 3 investments as of or for the years ended December 28, 2013 and December 29, 2012.
At year-end 2013 and 2012, the Plans’ assets were invested predominantly in fixed-income securities and publicly traded equities, but may invest in other asset classes in the future subject to the parameters of the investment policy. The Plans’ investments in fixed-income assets include U.S. Treasury and U.S. agency securities and corporate bonds. The Plans’ investments in equity assets include U.S. and international securities and equity funds. The Company estimates the fair value of the Plans’ assets using various valuation techniques and, to the extent available, quoted market prices in active markets or observable market inputs. The descriptions and fair value methodologies for the Plans’ assets are as follows:
Fixed Income Securities—Corporate and government bonds are classified as Level 2 assets, as they are either valued at quoted market prices from observable pricing sources at the reporting date or valued based upon comparable securities with similar yields and credit ratings.
Equity Securities—Equity securities are valued at the closing market price reported on a U.S. exchange where the security is actively traded and are therefore classified as Level 1 assets.
Cash—The carrying amounts of cash approximate fair value due to the short-term maturity.
Precious Metals—Precious metals are valued at the closing market price reported on a U.S. exchange where the security is actively traded and are therefore classified as Level 1 assets.
The fair value of the Company’s pension plans’ assets by asset class and fair value hierarchy level as of year-end 2013 and 2012 are as follows:
		2013
		Total fair			Quoted prices in active				Observable
		value			markets for identical				inputs (Level 2)
					assets (Level 1)
Fixed income securities:
Intermediate—government		$	1,647		$	—			$	1,647
Intermediate—corporate			3,138			—				3,138
Short-term—government			2,168			—				2,168
Short-term—corporate			4,040			—				4,040
Equity securities:
U.S. Large cap value			1,221			1,221				—
U.S. Large cap growth			1,536			1,536				—
U.S. Mid cap value			600			600				—
U.S. Mid cap growth			603			603				—
U.S. Small cap value			610			610				—
U.S. Small cap growth			599			599				—
International			889			889				—
Cash			1,665			1,665				—
Precious metals			358			358				—
Total		$	19,074		$	8,081			$	10,993
		2012
		Total fair			Quoted prices in active				Observable
		value			markets for identical				inputs (Level 2)
					assets (Level 1)
Fixed income securities:
Intermediate—government		$	1,247		$	—			$	1,247
Intermediate—corporate			4,402			—				4,402
Short-term—government			2,038			—				2,038
Short-term—corporate			3,123			—				3,123
Equity securities:
U.S. Large cap value			1,063			1,063				—
U.S. Large cap growth			1,037			1,037				—
U.S. Mid cap value			542			542				—
U.S. Mid cap growth			536			536				—
U.S. Small cap value			546			546				—
U.S. Small cap growth			539			539				—
International			1,134			1,134				—
Cash			1,656			1,656				—
Total		$	17,863		$	7,053			$	10,810
Cash Flows—The Company expects to contribute approximately $1.0 million and $1.3 million in 2014 to its pension plans and other postretirement benefit plans, respectively.
The estimated benefit payments for each of the next five years and the five-year period thereafter are as follows:
		Pension			Other
		benefits			benefits
2014		$	1,694		$	1,269
2015			1,704			1,109
2016			1,739			1,130
2017			1,737			963
2018			1,774			1,018
2019 - 2023			8,667			4,512
Total		$	17,315		$	10,001
Continental Cement Company, L.L.C. [Member]	'
Employee Benefit Plans	'
	-8	Employee Benefit Plans
	Deferred Compensation Plan
	The Company sponsors an Employee 401(k) Savings Plan for all salaried employees and certain union employees. The plan provides for various required and discretionary Company matches of employees’ eligible compensation contributed to the plan and a discretionary profit sharing contribution as determined by the Company’s Board of Directors. The Company’s contributions to the plan were $0.5 million, $0.4 million and $0.3 million, for the years ended December 28, 2013, December 31, 2012 and December 31, 2011, respectively.
	Defined Benefit Plans and Other Postretirement Benefits
	Continental Cement sponsors two noncontributory defined benefit pension plans for hourly and salaried employees. The salaried employee pension plan was closed to new participants and frozen in January 2000 and the hourly employee pension plan was closed to new participants in May 2003 and frozen in January 2014. Pension benefits for certain eligible hourly employees are based on a monthly pension factor for each year of credited service. Pension benefits for certain eligible salaried employees are generally based on years of service and average eligible compensation.
	Continental Cement also sponsors an unfunded healthcare and life insurance benefits plan for certain eligible retired employees. The retiree healthcare and life insurance plan was closed for salaried employees in January 2003 and hourly employees in July 2006. Effective January 1, 2012, the Company eliminated all future retiree health and life coverage for active salaried, nonunion hourly and certain union employees that retire on or after January 1, 2012. Effective January 1, 2014, the plan was amended to eliminate all future retiree health and life coverage for the remaining union employees.
	The funded status of the pension and other postretirement benefit plans is recognized in the consolidated balance sheets as the difference between the fair value of plan assets and the benefit obligations. For defined benefit pension plans, the benefit obligation is the projected benefit obligation (“PBO”) and for the other postretirement benefit plans the benefit obligation is the accumulated postretirement benefit obligation (“APBO”). The PBO represents the actuarial present value of benefits expected to be paid upon retirement based on estimated future compensation levels. However, since the plans’ participants are not subject to future compensation increases, the plans’ PBO equals the APBO. The APBO represents the actuarial present value of postretirement benefits attributed to employee services already rendered. The fair value of plan assets represents the current market value of assets held by an irrevocable trust fund for the sole benefit of participants. The measurement of the benefit obligation is based on Continental Cement’s estimates and actuarial valuations provided by third-party actuaries. These valuations reflect the terms of the plan and use participant-specific information such as compensation, age and years of service, as well as certain assumptions that require significant judgment, including estimates of discount rates, expected return on plan assets, rate of compensation increases, interest crediting rates and mortality rates.
	The Company uses its fiscal year-end as the measurement date for its defined benefit pension and other postretirement benefit plans.
	Obligations and Funded Status—The following information is as of year-end 2013 and 2012 and for the years ended December 28, 2013, December 31, 2012 and December 31, 2011:
			2013							2012
			Pension			Other				Pension			Other
			benefits			benefits				benefits			benefits
	Change in benefit obligations:
	Beginning of period		$	28,674		$	15,810			$	26,514		$	14,467
	Service cost			295			236				276			207
	Interest cost			963			513				1,055			585
	Actuarial (gain) loss			(2,674	)		(1,048	)			2,347			1,597
	Special termination benefits			—			39				—			—
	Benefits paid			(1,614	)		(1,395	)			(1,518	)		(1,046	)
	End of period			25,644			14,155				28,674			15,810
	Change in fair value of plan assets:
	Beginning of period			17,863			—				16,639			—
	Actual return on plan assets			1,512			—				1,205			—
	Employer contributions			1,313			1,395				1,537			1,046
	Benefits paid			(1,614	)		(1,395	)			(1,518	)		(1,046	)
	End of period			19,074			—				17,863			—
	Funded status of plans		$	(6,570	)	$	(14,155	)		$	(10,811	)	$	(15,810	)
	Current liabilities		$	—		$	(1,268	)		$	—		$	(1,055	)
	Noncurrent liabilities			(6,570	)		(12,887	)			(10,811	)		(14,755	)
	Liability recognized		$	(6,570	)	$	(14,155	)		$	(10,811	)	$	(15,810	)
	Amounts recognized in accumulated other comprehensive income:
	Net actuarial loss		$	4,831		$	4,139			$	8,056		$	5,501
	Prior service cost			—			(1,346	)			—			(1,526	)
	Total amount recognized		$	4,831		$	2,793			$	8,056		$	3,975
	The amount recognized in accumulated other comprehensive income (“AOCI”) is the actuarial loss, which has not yet been recognized in periodic benefit cost. At December 28, 2013, the actuarial loss expected to be amortized from AOCI to periodic benefit cost in 2014 is $0.1 million and $0.2 million for the pension and postretirement obligations, respectively.
			2013							2012						2011
			Pension			Other				Pension			Other			Pension			Other
			benefits			benefits				benefits			benefits			benefits			benefits
	Amounts recognized in other comprehensive (gain) loss:
	Net actuarial (gain) loss		$	(2,838	)	$	(1,048	)		$	2,444		$	1,597		$	4,066		$	3,390
	Prior service cost			—			180				—			—			—			(1,705	)
	Amortization of prior year service cost			—			—				—			180			—			—
	Amortization of (gain) loss			(387	)		(314	)			(261	)		(312	)		(5	)		(71	)
	Total amount recognized		$	(3,225	)	$	(1,182	)		$	2,183		$	1,465		$	4,061		$	1,614
	Components of net periodic benefit cost:
	Service cost		$	295		$	236			$	276		$	207		$	275		$	227
	Interest cost			963			513				1,055			585			1,161			710
	Amortization of loss			387			314				262			312			5			69
	Expected return on plan assets			(1,348	)		—				(1,301	)		(180	)		(1,400	)		—
	Special termination benefits			—			39				—			—			—			—
	Amortization of Prior Service Credit			—			(180	)			—			—			—			—
	Net periodic benefit cost		$	297		$	922			$	292		$	924		$	41		$	1,006
	Assumptions—Weighted-average assumptions used to determine the benefit obligations as of year-end 2013 and 2012 are:
			2013					2012
			Pension			Other		Pension				Other
			benefits			benefits		benefits				benefits
	Discount rate			4.21% - 4.46%		4.33%			3.30% - 3.57%			3.41%
	Expected long-term rate of return on plan assets			7.5	%	N/A			7.5	%		N/A
	Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 28, 2013, December 31, 2012 and December 31, 2011:
			2013							2012						2011
			Pension			Other				Pension			Other			Pension			Other
			benefits			benefits				benefits			benefits			benefits			benefits
	Discount rate			3.30% - 3.57%			3.41%				3.89% - 4.07%			4.00%			4.94% - 5.12.%			5.07%
Expected long-term rate of return on plan assets			7.5	%		N/A				7.5	%		N/A			8.5	%		N/A
The expected long-term return on plan assets is based upon the plans’ consideration of historical and forward-looking returns and the Company’s estimation of what a portfolio, with the target allocation described below, will earn over a long-term horizon. The discount rate is derived using the Citigroup Pension Discount Curve.
Assumed health care cost trend rates are 9% grading to 7% and 9% grading to 7% as of year end 2013 and 2012, respectively. Assumed health care cost trend rates have a significant effect on the amounts reported for the Company’s post-retirement medical and life plans. A one percentage-point change in assumed health care cost trend rates would have the following effects as of year-end 2013 and 2012:
		2013							2012
		Increase			Decrease				Increase			Decrease
Total service cost and interest cost components		$	66		$	(55	)		$	73		$	(63	)
Estimated APBO			1,251			(1,073	)			1,555			(1,331	)
Plan Assets—The defined benefit pension plans’ (the “Plans”) investment strategy is to minimize investment risk while generating acceptable returns. The Plans currently invest a relatively high proportion of their assets in fixed income securities, while the remainder is invested in equity securities, cash reserves and precious metals. The equity securities are diversified into funds with growth and value investment strategies. The target allocation for plan assets is as follows: equity securities – 30%; fixed income securities –63%; cash reserves –5%; and precious metals –2%. The Plans’ current investment allocations are within the tolerance of the target allocation.
Fair value determinations are based on the following hierarchy, which prioritizes the inputs used to measure fair value:
	•		Level 1—Quoted prices in active markets for identical assets and liabilities
	•		Level 2—Observable inputs, other than quoted prices, for similar assets or liabilities in active markets
	•		Level 3—Unobservable inputs, which includes the use of valuation models
The Company had no Level 3 investments as of or during the years ended December 28, 2013 and December 31, 2012. At year-end 2013 and 2012, the Plans’ assets were invested predominantly in publicly traded fixed-income securities and equities, but may invest in other asset classes in the future subject to the parameters of the investment policy. The Plans’ investments in fixed-income assets include U.S. Treasury and U.S. agency securities and corporate bonds. The Plans’ investments in equities include U.S. and international securities and equity funds. The Company estimates the fair value of the Plans’ assets using various valuation techniques and, to the extent available, quoted market prices in active markets or observable market inputs. The descriptions and fair value methodologies for the Plans’ assets are as follows:
Fixed Income Securities—Corporate and government bonds are classified as Level 2 assets, as they are either valued at quoted market prices from observable pricing sources at the reporting date or valued based upon comparable securities with similar yields and credit ratings.
Equity Securities—Equity securities are valued at the closing market price reported on a U.S. exchange where the security is actively traded and are therefore classified as Level 1 assets.
Cash—The carrying amounts of cash approximate fair value due to the short-term maturity.
Precious Metals—Precious metals are valued at the closing market price reported on a U.S. exchange where the security is actively traded and are therefore classified as Level 1 assets.
The fair value of the Company’s pension plans’ assets by asset class and fair value hierarchy level as of year-end 2013 and 2012 are as follows:
		2013
		Total fair			Quoted prices in active				Observable
		value			markets for identical				inputs (Level 2)
					assets (Level 1)
Fixed income securities:
Intermediate—government		$	1,647		$	—			$	1,647
Intermediate—corporate			3,138			—				3,138
Short-term—government			2,168			—				2,168
Short-term—corporate			4,040			—				4,040
Equity securities:
U.S. Large cap value			1,221			1,221				—
U.S. Large cap growth			1,536			1,536				—
U.S. Mid cap value			600			600				—
U.S. Mid cap growth			603			603				—
U.S. Small cap value			610			610				—
U.S. Small cap growth			599			599				—
International			889			889				—
Cash			1,665			1,665				—
Precious metals			358			358				—
Total		$	19,074		$	8,081			$	10,993
		2012
		Total			Quoted prices in active				Observable
		fair			markets for identical				inputs
		value			assets (Level 1)				(Level 2)
Fixed income securities:
Intermediate—government		$	1,247		$	—			$	1,247
Intermediate—corporate			4,402			—				4,402
Short-term—government			2,038			—				2,038
Short-term—corporate			3,123			—				3,123
Equity securities:
U.S. Large cap value			1,063			1,063				—
U.S. Large cap growth			1,037			1,037				—
U.S. Mid cap value			542			542				—
U.S. Mid cap growth			536			536				—
U.S. Small cap value			546			546				—
U.S. Small cap growth			539			539				—
International			1,134			1,134				—
Cash			1,656			1,656				—
Total		$	17,863		$	7,053			$	10,810
Cash Flows—The Company expects to contribute approximately $1.0 million to its pension plans and $1.3 million to its other postretirement benefit plans in 2014.
The estimated benefit payments for each of the next five years and the five-year period thereafter are as follows:
		Pension			Other
		benefits			benefits
2014		$	1,694		$	1,269
2015			1,704			1,109
2016			1,739			1,130
2017			1,737			963
2018			1,774			1,018
2019 - 2023			8,667			4,512
Total		$	17,315		$	10,001

Accrued_Mining_and_Landfill_Re

Accrued Mining and Landfill Reclamation	12 Months Ended
	Dec. 28, 2013
Asset Retirement Obligation Disclosure [Abstract]	'
Accrued Mining and Landfill Reclamation	'
	(12) Accrued Mining and Landfill Reclamation
	The Company has asset retirement obligations arising from regulatory requirements to perform certain reclamation activities at the time that certain quarries and landfills are closed, which are primarily included in other noncurrent liabilities on the consolidated balance sheets. The current portion of the liabilities, $0.5 million and $0.4 million as of December 28, 2013 and December 29, 2012, respectively, is included in accrued and other liabilities on the consolidated balance sheets. The liability was initially measured at fair value and subsequently is adjusted for accretion expense, payments and changes in the amount or timing of the estimated cash flows. The corresponding asset retirement costs are capitalized as part of the carrying amount of the related long-lived asset and depreciated over the asset’s remaining useful life. The following table presents the activity for the asset retirement obligations for the years ended December 28, 2013 and December 29, 2012:
		2013			2012
	Beginning balance	$	14,844		$	13,328
	Acquired obligations		286			364
	Change in cost estimate		721			604
	Settlement of reclamation obligations		(1,201	)		(77	)
	Additional liabilities incurred		414			—
	Accretion expense		717			625
	Ending balance	$	15,781		$	14,844

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 28, 2013
Commitments and Contingencies	'
	(13) Commitments and Contingencies
	Litigation and Claims—Summit Materials is party to certain legal actions arising from the ordinary course of business activities. In the opinion of management, these actions are without merit or the ultimate disposition, if any, resulting from them will not have a material effect on Summit Materials’ consolidated financial position, results of operations or liquidity. Summit Materials’ policy is to record legal fees as incurred.
	The Company is obligated under an indemnification agreement entered into with the sellers of Harper Contracting, Inc., Harper Sand and Gravel, Inc., Harper Excavating, Inc., Harper Ready Mix Company, Inc. and Harper Investments, Inc. (collectively, “Harper”) for the sellers’ ownership interests in a joint venture agreement. Summit Materials has the rights to any benefits under the joint venture as well as the assumption of any obligations, but does not own equity interests in the joint venture. The joint venture has incurred significant losses on a highway project in Utah, which have resulted in requests for funding from the joint venture partners and ultimately from the Company. Through year-end 2013, the Company has funded $8.8 million, $4.0 million in 2012 and $4.8 million in 2011. In 2012 and 2011, the Company recognized losses on the indemnification agreement of $8.0 million and $1.9 million, respectively, which are included in general and administrative expenses. As of year-end 2013 and 2012, an accrual of $4.3 million was recorded in other noncurrent liabilities as management’s best estimate of future funding obligations.
	In February 2011, the Company incurred a property loss related to a sunken barge with cement product aboard. In the year-ended December 28, 2013, the Company recognized $0.8 million of charges for lost product aboard the barge and costs to remove the barge from the waterway. As of December 28, 2013 and December 29, 2012, $0.9 million is included in accrued expenses as management’s best estimate of the remaining costs to remove the barge.
	Environmental Remediation—Summit Materials’ mining operations are subject to and affected by federal, state 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. Summit Materials 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 Summit Materials’ business, as it is with other companies engaged in similar businesses and there can be no assurance that environmental liabilities will not have a material adverse effect on Summit Materials’ consolidated financial position, results of operations or liquidity.
	Other—During the course of business, there may be revisions to project costs and conditions that can give rise to change orders. Revisions can also result in claims we might make against the customer or a subcontractor to recover project variances that have not been satisfactorily addressed through change orders with the customer. As of year-end 2013 and 2012, unapproved change orders and claims were $3.2 million ($0.5 million in costs and estimated earnings in excess of billings and $2.7 million in other assets) and $4.8 million ($1.6 million in costs and estimated earnings in excess of billings and $3.2 million in other assets), respectively.
	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 position, results of operations, and cash flows of the Company. The terms of the purchase commitments are generally less than one year.
Continental Cement Company, L.L.C. [Member]	'
Commitments and Contingencies	'
	-9	Commitments and Contingencies
	Litigation and Claims
	Continental Cement is party to certain legal actions arising from the ordinary course of business activities. In the opinion of management, these actions are without merit or that the ultimate disposition, if any, resulting from them will not have a material effect on Continental Cement’s consolidated financial position, results of operations or liquidity. Continental Cement’s policy is to record legal fees as incurred.
	In February 2011, Continental Cement incurred a property loss related to a sunken barge with cement product aboard. As of December 28, 2013 and December 31, 2012, the Company had a $0.9 million accrual for the estimated remaining costs to remove the barge.
	Environmental Remediation
	Continental Cement’s manufacturing operations are subject to and affected by Federal, state 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. Continental Cement 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 Continental Cement’s business, as it is with other companies engaged in similar businesses and there can be no assurance that environmental liabilities will not have a material adverse effect on Continental Cement’s financial position, results of operations or liquidity in the future.
	Other
	Continental Cement 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 position, results of operations, and cash flows of Continental Cement. The terms of the purchase commitments are generally less than one year.
	As of December 28, 2013, approximately 62% of the Company’s employees were represented by labor organizations under collective bargaining agreements. The Company’s collective bargaining agreements for such employees generally expire between 2013 and 2015. The contract that expired in 2013 contract was successfully renegotiated and ratified in December 2013 and is expected to be finalized in the first quarter of 2014 with a term that will extend through 2018.

RelatedParty_Transactions

Related-Party Transactions	12 Months Ended
	Dec. 28, 2013
Related-Party Transactions	'
	(14) Related-Party Transactions
	The Company incurred management fees paid to Blackstone Management Partners L.L.C. (“BMP”) totaling $2.6 million, $2.1 million and $3.0 million in 2013, 2012 and 2011, respectively, under terms of an agreement dated July 30, 2009, between Parent and BMP. Under the terms of the agreement, BMP is permitted to, and has, assigned a portion of the fees to which it is entitled to receive to Silverhawk Summit, L.P. and to certain members of management. The fees were paid for consultancy services related to acquisition activities and are included in general and administrative expenses.
	The Company purchased equipment from a noncontrolling member of Continental Cement for approximately $2.3 million, inclusive of $0.1 million of interest, in 2011, which was paid for in 2012.
	Summit Materials earned revenue of $0.6 million, $7.9 million and $8.6 million and incurred costs of $0.2 million, $0.2 million and $0.7 million in connection with several transactions with unconsolidated affiliates for the years ended December 28, 2013, December 29, 2012 and December 31, 2011, respectively. As of December 28, 2013 and December 29, 2012, accounts receivable from affiliates was $0.4 million and $1.9 million, respectively, and accounts payable to affiliates was zero and $0.2 million, respectively.
	Cement sales to companies owned by certain noncontrolling members of Continental Cement were approximately $12.7 million, $12.5 million and $9.5 million for the years ended December 28, 2013, December 29, 2012 and December 2011, respectively, and accounts receivable due from these parties were approximately $0.2 million and $1.0 million as of December 28, 2013 and December 29, 2012, respectively.
	As of year-end 2013 and 2012, the Company had accrued interest payments of $0.7 million and $2.1 million, respectively, due to a certain noncontrolling member for a related-party note, which is expected to be paid in 2014. The principal balance on the note was repaid as part of the January 2012 financing transactions.
Continental Cement Company, L.L.C. [Member]	'
Related-Party Transactions	'
	-10	Related-Party Transactions
	The Company purchased equipment from a certain noncontrolling member for approximately $2.3 million in 2011, which was paid for in 2012.
	As of year-end 2013 and 2012, the Company had accrued interest payments of $0.7 million and $2.1 million, respectively, due to a certain noncontrolling member for a related-party note, which is expected to be paid in 2014. The principal balance on the note was repaid in January 2012.
	Cement sales to companies owned by certain noncontrolling members of Continental Cement were approximately $12.7 million, $12.5 million and $9.5 million during the years ended December 28, 2013, December 31, 2012 and December 31, 2011, respectively, and accounts receivables due from these parties were approximately $0.2 million and $1.0 million as of December 28, 2013 and December 31, 2012, respectively.
	Cement sales to subsidiaries of Summit Materials were approximately $4.5 million, $3.8 million and $2.8 million for the years ended December 28, 2013, December 31, 2012 and December 31, 2011, respectively, and accounts receivable due from these parties were approximately $0.2 million as of December 28, 2013 and December 31, 2012.
	Waste fuel sales by Continental Cement to American Environmental Services, Inc., which owned a noncontrolling interest in GAR until the Company purchased its interest in 2011, were approximately $0.7 million in the year ended December 31, 2011. After the Company purchased American Environmental Services, Inc.’s interest in GAR, American Environmental Services, Inc. ceased to be a related party.

AcquisitionRelated_Liabilities

Acquisition-Related Liabilities	12 Months Ended
	Dec. 28, 2013
Business Combinations [Abstract]	'
Acquisition-Related Liabilities	'
	(15) Acquisition-Related Liabilities
	A number of acquisition-related liabilities have been recorded subject to terms in the relevant purchase agreements. There are three main categories of such obligations, deferred consideration, noncompete payments and earn-out obligations. Noncompete payments have been accrued where certain former owners of newly acquired companies have entered into standard noncompete arrangements. Subject to terms and conditions stated in these noncompete agreements, payments are generally made over a five-year period. Deferred consideration is purchase price consideration paid in the future as agreed to in the purchase agreement and is not contingent on future events. Deferred consideration is scheduled to be paid in years ranging from 5 to 20 years in either monthly, quarterly or annual installments. The remaining payments due under these noncompete and deferred consideration agreements are as follows:
	2014	$	10,790
	2015		6,742
	2016		5,950
	2017		5,910
	2018		5,370
	Thereafter		9,963
	Total scheduled payments		44,725
	Present value adjustments		(12,242	)
	Total noncompete obligations and deferred consideration	$	32,483
	Accretion on the deferred consideration and noncompete obligations is recorded in interest expense.

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	12 Months Ended
	Dec. 28, 2013
Supplemental Cash Flow Information	'
	(16) Supplemental Cash Flow Information
	Supplemental cash flow information for the years ended December 28, 2013, December 29, 2012 and December 31, 2011 is as follows:
			2013		2012			2011
	Cash payments:
	Interest		$	52,001	$	36,357		$	41,790
	Income taxes			457		799			5,608
Continental Cement Company, L.L.C. [Member]	'
Supplemental Cash Flow Information	'
	-11	Supplemental Cash Flow Information
	Supplemental cash flow information is as follows for the years ended December 28, 2013, December 31, 2012 and December 31, 2011:
			2013		2012			2011
	Cash paid for interest		$	11,488	$	7,353		$	12,946
	Non cash financing activities:
	Proceeds on borrowings due to Summit Materials		$	—	$	156,842		$	—
	Repayment by Summit Materials of long-term debt and accrued interest			—		(156,842	)		—

Leasing_Arrangements

Leasing Arrangements	12 Months Ended
	Dec. 28, 2013
Leasing Arrangements	'
	(17) Leasing Arrangements
	Rent expense, including short-term rentals, during the years ended December 28, 2013, December 29, 2012 and December 31, 2011 was $4.0 million, $3.5 million and $4.3 million, respectively. The Company has lease agreements associated with quarry facilities under which royalty payments are made. The payments are generally based on tons sold in a particular period; however, certain agreements have minimum annual payments. Royalty expense recorded in cost of revenue during the years ended December 28, 2013, December 29, 2012 and December 31, 2011 was $4.5 million, $3.9 million and $3.1 million, respectively. Minimum contractual commitments under long-term operating leases, which primarily relate to land, plant and equipment and under royalty agreements as of December 28, 2013, are as follows:
			Operating		Royalty
			Leases		Agreements
	2014		$	4,034	$	2,044
	2015			3,890		2,065
	2016			3,098		1,974
	2017			2,376		2,047
	2018			1,983		1,434
Continental Cement Company, L.L.C. [Member]	'
Leasing Arrangements	'
	-12	Leasing Arrangements
	Rent expense incurred, including short term rentals, primarily related to land and equipment, was $0.4 million, $0.5 million and $0.4 million for the years ended December 28, 2013, December 31, 2012 and December 31, 2011, respectively.
	Minimum rental commitments under long-term operating leases as of December 28, 2013, are as follows:
	2014		$	378
	2015			341
	2016			325
	2017			291
	2018			291

Redeemable_Noncontrolling_Inte

Redeemable Noncontrolling Interest	12 Months Ended
	Dec. 28, 2013
Noncontrolling Interest [Abstract]	'
Redeemable Noncontrolling Interest	'
	(18) Redeemable Noncontrolling Interest
	The Company owns 100 Class A Units of Continental Cement, which represent an approximately 70% economic interest and have a preference in liquidation to the Class B Units. Continental Cement issued 100,000,000 Class B Units in May 2010, which remain outstanding and represent an approximately 30% economic interest.
	Continental Cement’s Class A Units include a cumulative distribution preference which requires, to the extent distributions are authorized by its Board of Directors, Continental Cement Class A Units receive, prior to any distributions to the Class B Unit holders, a priority return of 11% accruing daily and compounding annually on each anniversary of the date of issuance to Class A Unit holders. To the extent the priority return is not made in a given year, the amount of the priority return will increase the liquidation preference of the Class A Units up to an 80% allowable sharing percentage in distributions and liquidation proceeds. The Company holds all the Class A Units. No distributions are currently anticipated.
	The Continental Cement Amended and Restated Limited Liability Company Agreement (as amended, the “LLC Agreement”) provides Summit Materials with a call option that allows the Company to call the Class B Units held by the owners of Continental Cement prior to Summit Materials’ purchase of the Class A Units (“Rollover Members”), at a strike price that approximates fair value, on the earlier of May 2016, on the date that Summit Materials affects an initial public offering or upon any other change of control of Summit Materials. The Rollover Members have a put option that allows them to put the Class B Units to Summit Materials, at a strike price that approximates fair value, exercisable if there is a change of control of the Summit Materials Class A Units, or after May 2016. Finally, the LLC Agreement includes transfer restrictions which prohibit the Rollover Members from transferring their Class B Units without the consent of the Board of Continental Cement.
	Because the Class B Units can be put to Continental Cement by the Rollover Members in the future based on the passage of time, which can be accelerated upon the occurrence of a contingent event, Summit Materials’ noncontrolling interest is classified in temporary equity. The redemption value is based upon the estimated fair value of Continental Cement, which is valued using Level 3 inputs. Summit Materials elected to accrete changes in the redemption value of the noncontrolling interest over the period from the date of issuance to the earliest anticipated redemption date of the instrument, which is currently May 2016, using an interest method. The accretion is as an adjustment to the consolidated accumulated deficit. The redemption value of the redeemable noncontrolling interest as of year-end 2013 and 2012 approximated its carrying value.

Employee_Long_Term_Incentive_P

Employee Long Term Incentive Plan	12 Months Ended
	Dec. 28, 2013
Contractors [Abstract]	'
Employee Long Term Incentive Plan	'
	(19) Employee Long Term Incentive Plan
	Certain employees of the Company hold Class D unit interests in Parent that provide rights to cash distributions based on a predetermined distribution formula upon the general partner of Parent declaring a distribution.
	Certain of the Class D units vest with the passage of time (time-vesting interests) and the remaining vest when certain investment returns are achieved by the investors of Parent (performance-vesting interests). Of the time-vesting-interests, 20% vest on the first anniversary and the remaining 80% vest monthly over a period of four years following the first anniversary date. Units that are not vested in accordance with their terms within eight years are automatically forfeited without consideration.
	If the employee leaves the Company, the Company can (1) purchase the vested Class D units for a lump sum payment provided certain conditions have been met or (2) elect to convert all of the employee’s Class D units into a right to receive future distributions capped at a termination amount. The termination amount is determined as an amount equal to the fair market value of the Class D unit holder’s vested interests minus any amounts already distributed to the Class D unit holders respective of those Class D units plus interest on the difference between such fair market value and amounts already distributed. The fair value of the time-vesting Class D units granted in 2013, 2012 and 2011 totaled $1.6 million, $1.1 million and $3.4 million, respectively. The weighted-average grant-date fair value in 2013, 2012 and 2011 was $2,786, $3,761 and $3,876, respectively. The following table summarizes information for the Class D unit interests:
		Time-vesting Interests					Performance-vesting
							Interests
		Number of			Weighted		Number of			Weighted
		units			average grant-		units			average grant-
					date fair value					date fair value
					per unit					per unit
	Beginning balance—December 29, 2012		1,692		$	3,864		4,202		$	3,087
	Granted		584			2,786		759			2,314
	Vested		(772	)		3,896		—			—
	Forfeited		(2	)		3,893		(5	)		3,176
	Cancelled		(61	)		2,208		(79	)		1,388
	Balance—December 28, 2013		1,441					4,877
	The estimated fair value at December 28, 2013 of shares vested during 2013 was $2.2 million. As of year-end 2013 and 2012, the cumulative amount of units vested total 2,531 and 1,732, respectively. The fair value of the Class D units is estimated as of the grant date using Monte Carlo simulations, which requires the input of subjective assumptions, including the expected volatility and the expected term. The following table presents the weighted average assumptions used to estimate the fair value of grants in 2013, 2012 and 2011:
		2013			2012		2011
	Class D Units
	Risk-free interest rate		0.50%			1.62%		1.71% - 2.39%
	Dividend yield		None			None		None
	Volatility		58%			47%		42% - 49%
	Expected term		4 years			6 - 8 years		6 - 8 years
	The risk-free rate is based on the yield at the date of grant of a U.S. Treasury security with a maturity period approximating the expected term. As the Company has no plans to issue regular dividends, a dividend yield of zero was used. The volatility assumption is based on reported data of a peer group of publically traded companies for which historical information was available adjusted for the Company’s capital structure. The expected term is based on expectations about future exercises and represents the period of time that the units granted are expected to be outstanding.
	Compensation expense for time-vesting interest granted is based on the grant-date fair value. The Company recognizes these compensation costs on a straight-line basis over the service period, which is generally the vesting period of the award. A forfeiture rate assumption is factored into the compensation cost based on historical forfeitures. Compensation expense for performance-vesting interests would be recognized based on the grant date fair value. However, no compensation expense has been recognized for the performance-vesting interests, as management does not believe it is currently probable that certain investment returns, the performance criteria, will be achieved.
	Share-based compensation expense, which is recognized in general and administrative expenses, totaled $2.3 million, $2.5 million and $2.5 million in the years ended December 28, 2013, December 29, 2012 and December 31, 2011, respectively. As of December 28, 2013, unrecognized compensation cost totaled $4.6 million. The weighted average remaining contractual term over which the unrecognized compensation cost is to be recognized is 2.6 years as of year-end 2013.

Segment_Information

Segment Information	12 Months Ended
	Dec. 28, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	(20) Segment Information
	The Company has determined that it has three operating segments, which are its reportable segments: Central; West; and East regions. These segments are consistent with the Company’s management reporting structure. The operating results of each segment are regularly reviewed and evaluated separately by the Chief Executive Officer, the Company’s Chief Operating Decision Maker (“CODM”). The CODM primarily evaluates the performance of its segments and allocates resources to them based on segment profit, which is computed as earnings from continuing operations before interest, taxes, depreciation, depletion, amortization, accretion and goodwill impairment. In addition, certain items such as management fees are excluded from the calculation of segment profit.
	Each region has several acquired subsidiaries that are engaged in various activities including quarry mining, aggregate production and contracting. Assets employed by 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 for the following fiscal years:
			2013			2012			2011
	Revenue:
	Central region		$	329,621		$	302,113		$	264,008
	West region			426,195			484,922			362,577
	East region			160,385			139,219			162,491
	Total revenue		$	916,201		$	926,254		$	789,076
			2013			2012			2011
	Segment profit (loss):
	Central region		$	72,918		$	65,767		$	65,651
	West region			28,607			14,429			36,442
	East region			15,134			10,782			15,504
	Corporate and other(1)			(24,878	)		(15,560	)		(9,877	)
	Total reportable segments and corporate			91,781			75,418			107,720
	Interest expense			56,443			58,079			47,784
	Depreciation, depletion, amortization and accretion			72,934			68,290			61,377
	Goodwill impairment			68,202			—			—
	Loss from continuing operations before taxes		$	(105,798	)	$	(50,951	)	$	(1,441	)
	-1	Corporate results primarily consist of compensation and office expenses for employees included in the Company’s headquarters and transactions costs.
			2013			2012			2011
	Cash paid for capital expenditures:
	Central region		$	33,030		$	20,996		$	20,078
	West region			21,856			14,993			9,256
	East region			7,753			8,736			9,311
	Total reportable segments			62,639			44,725			38,645
	Corporate and other			3,360			763			11
	Total capital expenditures		$	65,999		$	45,488		$	38,656
			2013			2012			2011
	Depreciation, depletion, amortization and accretion:
	Central region		$	33,808		$	30,215		$	27,646
	West region			24,167			23,771			19,706
	East region			14,493			14,223			13,938
	Total reportable segments			72,468			68,209			61,290
	Corporate and other			466			81			87
	Total depreciation, depletion, amortization and accretion		$	72,934		$	68,290		$	61,377
			2013			2012			2011
	Total assets:
	Central region		$	657,421		$	610,003		$	587,341
	West region			383,544			428,115			451,017
	East region			192,486			224,603			238,018
	Total reportable segments			1,233,451			1,262,721			1,276,376
	Corporate and other			14,343			18,492			7,889
	Total assets		$	1,247,794		$	1,281,213		$	1,284,265
			2013			2012			2011
	Revenue by product:*
	Aggregates		$	159,019		$	146,991		$	116,082
	Cement			76,211			77,676			69,664
	Ready-mixed concrete			112,878			100,941			94,302
	Asphalt			219,811			242,458			182,952
	Construction and paving			478,280			505,189			464,866
	Other			(129,998	)		(147,001	)		(138,790	)
	Total revenue		$	916,201		$	926,254		$	789,076
	*	Revenue by product includes intracompany sales transferred at market value. The elimination of intracompany transactions is included in Other.

Senior_Notes_Guarantor_and_Non

Senior Notes' Guarantor and Non-Guarantor Financial Information	12 Months Ended
	Dec. 28, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Senior Notes' Guarantor and Non-Guarantor Financial Information	'
	(21) Senior Notes’ Guarantor and Non-Guarantor Financial Information
	The Company’s 100 percent-owned subsidiary companies (“Wholly-owned Guarantors”) and Continental Cement (“Non Wholly-owned Guarantor”), are named as guarantors (collectively, the “Guarantors”) of the Senior Notes. Other partially-owned subsidiaries do not guarantee the Senior Notes (collectively, the “Non-Guarantors”), including a subsidiary of Continental Cement. The Guarantors provide a joint and several, full and unconditional guarantee of the Senior Notes. There are no significant restrictions on the Company’s ability to obtain funds from any of the Guarantor Subsidiaries in the form of a dividend or loan. Additionally, there are no significant restrictions on a Guarantor Subsidiary’s ability to obtain funds from the Company or its direct or indirect subsidiaries.
	The following condensed consolidating balance sheets, statements of operations and cash flows are provided for Summit Materials (referred to as “Parent” in the condensed financial statements below), the Non-Wholly-owned Guarantor, the Wholly-owned Guarantors and the Non-Guarantors. Summit Materials Finance Corp. as a co-issuer of the Senior Notes, had no transactions during the respective periods or assets as of December 28, 2013 and December 29, 2012. 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 results of operations, cash flows or financial position had the guarantor or non-guarantor subsidiaries operated as independent entities.
	Condensed Consolidating Balance Sheets
	December 28, 2013
		Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
		Materials,			Wholly-			owned			Guarantors
		LLC			owned			Guarantors
		(Parent)			Guarantor
	Assets
	Current assets:
	Cash	$	10,375		$	9		$	3,442		$	3,631		$	(2,540	)	$	14,917
	Accounts receivable, net		—			4,587			93,102			3,100			(1,452	)		99,337
	Intercompany receivables		38,134			3,433			30,787			—			(72,354	)		—
	Cost and estimated earnings in excess of billings		—			—			10,539			228			—			10,767
	Inventories		—			10,402			85,372			658			—			96,432
	Other current assets		750			444			11,715			272			—			13,181
	Total current assets		49,259			18,875			234,957			7,889			(76,346	)		234,634
	Property, plant and equipment, net		3,969			301,908			518,935			6,966			—			831,778
	Goodwill		—			23,124			102,942			972			—			127,038
	Intangible assets, net		—			642			14,505			—			—			15,147
	Other assets		296,494			17,973			37,535			1,303			(314,108	)		39,197
	Total assets	$	349,722		$	362,522		$	908,874		$	17,130		$	(390,454	)	$	1,247,794
	Liabilities, Redeemable Noncontrolling Interest and Member’s Interest
	Current liabilities:
	Current portion of debt	$	26,010		$	1,018		$	3,192		$	—		$	—		$	30,220
	Current portion of acquisition-related liabilities		2,000			—			8,635			—			—			10,635
	Accounts payable		5,455			9,387			57,142			1,572			(1,452	)		72,104
	Accrued expenses		12,041			9,185			37,342			1,223			(2,540	)		57,251
	Intercompany payables		—			—			71,556			798			(72,354	)		—
	Billings in excess of costs and estimated earnings		—			—			8,837			426			—			9,263
	Total current liabilities		45,506			19,590			186,704			4,019			(76,346	)		179,473
	Long-term debt		19,587			154,590			484,590			—			—			658,767
	Acquisition-related liabilities		85			—			23,671			—			—			23,756
	Other noncurrent liabilities		959			20,306			56,215			—			—			77,480
	Total liabilities		66,137			194,486			751,180			4,019			(76,346	)		939,476
	Redeemable noncontrolling interest		—			—			—			—			24,767			24,767
	Redeemable members’ interest		—			23,450			—			—			(23,450	)		—
	Total member’s interest		283,585			144,586			157,694			13,111			(315,425	)		283,551
	Total liabilities, redeemable noncontrolling interest and member’s interest	$	349,722		$	362,522		$	908,874		$	17,130		$	(390,454	)	$	1,247,794
	Condensed Consolidating Balance Sheets
	December 29, 2012
		Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
		Materials,			Wholly-			owned			Guarantors
		LLC			owned			Guarantors
		(Parent)			Guarantor
	Assets
	Current assets:
	Cash	$	697		$	397		$	30,981		$	680		$	(5,324	)	$	27,431
	Accounts receivable, net		—			7,421			90,765			3,255			(1,143	)		100,298
	Intercompany receivables		14,931			15,557			9,018			—			(39,506	)		—
	Cost and estimated earnings in excess of billings		—			—			11,428			147			—			11,575
	Inventories		—			7,073			84,555			1,349			—			92,977
	Other current assets		25			726			8,447			2,409			(1,539	)		10,068
	Total current assets		15,653			31,174			235,194			7,840			(47,512	)		242,349
	Property, plant and equipment, net		1,074			287,677			517,994			6,862			—			813,607
	Goodwill		—			23,124			155,024			972			—			179,120
	Intangible assets, net		—			742			7,864			—			—			8,606
	Other assets		374,581			11,891			161,442			1,315			(511,698	)		37,531
	Total assets	$	391,308		$	354,608		$	1,077,518		$	16,989		$	(559,210	)	$	1,281,213
	Liabilities, Redeemable Noncontrolling Interest and Member’s Interest
	Current liabilities:
	Current portion of debt	$	—		$	965		$	3,035		$	—		$	—		$	4,000
Current portion of acquisition-related liabilities		—			—			9,525			—			—			9,525
Accounts payable		2,745			6,715			51,179			2,138			(1,143	)		61,634
Accrued expenses		6,877			10,742			38,050			1,015			(6,862	)		49,822
Intercompany payables		—			—			33,396			6,110			(39,506	)		—
Billings in excess of costs and estimated earnings		—			—			6,656			270			—			6,926
Total current liabilities		9,622			18,422			141,841			9,533			(47,511	)		131,907
Long-term debt		—			155,394			480,449			—			—			635,843
Acquisition-related liabilities		—			—			23,919			—			—			23,919
Other noncurrent liabilities		395			27,091			56,780			—			—			84,266
Total liabilities		10,017			200,907			702,989			9,533			(47,511	)		875,935
Redeemable noncontrolling interest		—			—			—			—			22,850			22,850
Redeemable members’ interest		—			22,850			—			—			(22,850	)		—
Total member’s interest		381,291			130,851			374,529			7,456			(511,699	)		382,428
Total liabilities, redeemable noncontrolling interest and member’s interest	$	391,308		$	354,608		$	1,077,518		$	16,989		$	(559,210	)	$	1,281,213
Condensed Consolidating Statements of Operations and Comprehensive (Loss) Income
Year ended December 28, 2013
	Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
	Materials			Wholly-			owned			Guarantors
	LLC			owned			Guarantors
	(Parent)			Guarantor
Total revenue	$	—		$	80,759		$	807,921		$	41,910		$	(14,389	)	$	916,201
Cost of revenue (excluding items shown separately below)		—			55,241			611,799			24,401			(14,389	)		677,052
General and administrative expenses		7,241			7,673			125,778			1,308			—			142,000
Goodwill impairment		—			—			68,202			—			—			68,202
Depreciation, depletion, amortization and accretion		465			11,378			60,078			1,013			—			72,934
Transaction costs		—			—			3,990			—			—			3,990
Operating (loss) income		(7,706	)		6,467			(61,926	)		15,188			—			(47,977	)
Other expense (income), net		99,085			(3,737	)		(3,410	)		274			(90,834	)		1,378
Interest expense		—			10,702			49,591			382			(4,232	)		56,443
(Loss) income from continuing operations before taxes		(106,791	)		(498	)		(108,107	)		14,532			95,066			(105,798	)
Income tax expense		—			—			(2,647	)		—			—			(2,647	)
(Loss) income from continuing operations		(106,791	)		(498	)		(105,460	)		14,532			95,066			(103,151	)
Loss from discontinued operations		—			—			528			—			—			528
Net (loss) income		(106,791	)		(498	)		(105,988	)		14,532			95,066			(103,679	)
Net income attributable to noncontrolling interest		—			—			—			—			3,112			3,112
Net (loss) income attributable to member of Summit Materials, LLC	$	(106,791	)	$	(498	)	$	(105,988	)	$	14,532		$	91,954		$	(106,791	)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	$	(106,791	)	$	3,909		$	(105,988	)	$	14,532		$	90,632		$	(103,706	)
Condensed Consolidating Statements of Operations and Comprehensive (Loss) Income
Year ended December 29, 2012
	Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
	Materials			Wholly-			owned			Guarantors
	LLC			owned			Guarantors
	(Parent)			Guarantor
Total revenue	$	—		$	81,516		$	824,796		$	33,074		$	(13,132	)	$	926,254
Cost of revenue (excluding items shown separately below)		—			58,319			649,577			18,582			(13,132	)		713,346
General and administrative expenses		8			6,235			119,645			1,327			—			127,215
Depreciation, depletion, amortization and accretion		81			10,093			57,080			1,036			—			68,290
Transaction costs		—			—			1,988			—			—			1,988
Operating (loss) income		(89	)		6,869			(3,494	)		12,129			—			15,415
Other expense (income), net		52,400			(2,065	)		6,630			(101	)		(48,577	)		8,287
Interest expense		—			12,045			47,293			633			(1,892	)		58,079
(Loss) income from continuing operations before taxes		(52,489	)		(3,111	)		(57,417	)		11,597			50,469			(50,951	)
Income tax expense		5			—			(3,925	)		—			—			(3,920	)
(Loss) income from continuing operations		(52,494	)		(3,111	)		(53,492	)		11,597			50,469			(47,031	)
Loss from discontinued operations		—			—			3,546			—			—			3,546
Net (loss) income		(52,494	)		(3,111	)		(57,038	)		11,597			50,469			(50,577	)
Net income attributable to noncontrolling interest		—			—			—			—			1,919			1,919
Net (loss) income attributable to member of Summit Materials, LLC	$	(52,494	)	$	(3,111	)	$	(57,038	)	$	11,597		$	48,550		$	(52,496	)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	$	(52,494	)	$	(6,759	)	$	(57,038	)	$	11,597		$	49,645		$	(55,049	)
Condensed Consolidating Statements of Operations and Comprehensive (Loss) Income
Year ended December 31, 2011
	Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
	Materials			Wholly-			owned			Guarantors
	LLC			owned			Guarantors
	(Parent)			Guarantor
Total revenue	$	—		$	70,064		$	700,916		$	21,566		$	(3,470	)	$	789,076
Cost of revenue (excluding items shown separately below)		—			41,221			542,699			17,204			(3,470	)		597,654
General and administrative expenses		1,453			3,933			89,011			1,429			—			95,826
Depreciation, depletion, amortization and accretion		87			9,697			50,640			953			—			61,377
Transaction costs		—			—			9,120			—			—			9,120
Operating (loss) income		(1,540	)		15,213			9,446			1,980			—			25,099
Other expense (income), net		8,510			(61	)		(24,375	)		124			(5,442	)		(21,244	)
Interest expense		—			14,004			33,685			647			(552	)		47,784
(Loss) income from continuing operations before taxes		(10,050	)		1,270			136			1,209			5,994			(1,441	)
Income tax expense		—			—			3,408			—			—			3,408
(Loss) income from continuing operations		(10,050	)		1,270			(3,272	)		1,209			5,994			(4,849	)
Loss from discontinued operations		—			—			5,201			—			—			5,201
Net (loss) income		(10,050	)		1,270			(8,473	)		1,209			5,994			(10,050	)
Net income attributable to noncontrolling interest		695			—			695			—			(695	)		695
Net (loss) income attributable to member of Summit Materials, LLC	$	(10,745	)	$	1,270		$	(9,168	)	$	1,209		$	6,689		$	(10,745	)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	$	(9,375	)	$	(4,405	)	$	(13,473	)	$	1,209		$	10,994		$	(15,050	)
Condensed Consolidating Statements of Cash Flows
Year ended December 28, 2013
	Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
	Materials,			Wholly-			owned			Guarantors
	LLC			owned			Guarantors
	(Parent)			Guarantor
Net cash (used for) provided by operating activities	$	(232	)	$	9,003		$	44,746		$	12,895		$	—		$	66,412
Cash flow from investing activities:
Acquisitions, net of cash acquired		—			—			(61,601	)		—			—			(61,601	)
Purchase of property, plant and equipment		(3,359	)		(24,896	)		(36,629	)		(1,115	)		—			(65,999	)
Proceeds from the sale of property, plant, and equipment		—			3			16,020			62			—			16,085
Net cash used for investing activities		(3,359	)		(24,893	)		(82,210	)		(1,053	)		—			(111,515	)
Cash flow from financing activities
Net proceeds from debt issuance		230,817			—			—			—			—			230,817
Loans received from and payments made on loans from other Summit Companies		(29,121	)		15,502			19,726			(8,891	)		2,784			—
Payments on long-term debt		(188,424	)		—			—			—			—			(188,424	)
Payments on acquisition-related liabilities		—			—			(9,801	)		—			—			(9,801	)
Other		(3	)		—			—			—			—			(3	)
Net cash provided by (used for) financing activities		13,269			15,502			9,925			(8,891	)		2,784			32,589
Net decrease (increase) in cash		9,678			(388	)		(27,539	)		2,951			2,784			(12,514	)
Cash—Beginning of period		697			397			30,981			680			(5,324	)		27,431
Cash—End of period	$	10,375		$	9		$	3,442		$	3,631		$	(2,540	)	$	14,917
Condensed Consolidating Statements of Cash Flows
Year ended December 29, 2012
	Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
	Materials,			Wholly-			owned			Guarantors
	LLC			owned			Guarantors
	(Parent)			Guarantor
Net cash provided by operating activities	$	4,845		$	12,806		$	36,649		$	8,217		$	(238	)	$	62,279
Cash flow from investing activities:
Acquisitions, net of cash acquired		—			—			(48,757	)		—			—			(48,757	)
Purchase of property, plant and equipment		(762	)		(12,174	)		(31,818	)		(734	)		—			(45,488	)
Proceeds from the sale of property, plant, and equipment		—			69			8,577			190			—			8,836
Other		—			—			69			—			—			69
Net cash used for investing activities		(762	)		(12,105	)		(71,929	)		(544	)		—			(85,340	)
Cash flow from financing activities
Net proceeds from debt issuance		713,378			(17	)		—			—			—			713,361
Loans received from and payments made on loans from other Summit Companies		(25,371	)		(295	)		39,783			(8,793	)		(5,324	)		—
Payments on long-term debt		(697,438	)		—			—			—			—			(697,438	)
Payments on acquisition-related liabilities		—			—			(7,519	)		—			—			(7,519	)
Other		(656	)		—			—			(284	)		238			(702	)
Net cash (used for) provided by financing activities		(10,087	)		(312	)		32,264			(9,077	)		(5,086	)		7,702
Net decrease (increase) in cash		(6,004	)		389			(3,016	)		(1,404	)		(5,324	)		(15,359	)
Cash—Beginning of period		6,701			8			33,997			2,084			—			42,790
Cash—End of period	$	697		$	397		$	30,981		$	680		$	(5,324	)	$	27,431
Condensed Consolidating Statements of Cash Flows
Year ended December 31, 2011
	Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
	Materials,			Wholly-			owned			Guarantors
	LLC			owned			Guarantors
	(Parent)			Guarantor
Net cash provided by operating activities	$	(824	)	$	3,808		$	17,262		$	2,586		$	421		$	23,253
Cash flow from investing activities:
Acquisitions, net of cash acquired		—			—			(161,073	)		—			—			(161,073	)
Purchase of property, plant and equipment		(11	)		(5,933	)		(31,210	)		(1,502	)		—			(38,656	)
Proceeds from the sale of property, plant, and equipment		—			168			6,880			109			—			7,157
Proceeds from the sale of investments		—			—			377			(136	)		—			241
Cash contribution to affiliates		(135,530	)		—			—			—			135,530			—
Net cash used for investing activities		(135,541	)		(5,765	)		(185,026	)		(1,529	)		135,530			(192,331	)
Cash flow from financing activities
Proceeds from investment by member		103,630			—			135,530			421			(135,951	)		103,630
Net proceeds from debt issuance		—			36,456			60,292			—			—			96,748
Payments on long-term debt		—			(34,500	)		(14,500	)		—			—			(49,000	)
Payments on acquisition-related liabilities		—			—			(4,593	)		—			—			(4,593	)
Other		—			—			—			(10	)		—			(10	)
Net cash (used for) provided by financing activities		103,630			1,956			176,729			411			(135,951	)		146,775
Net decrease (increase) in cash		(32,735	)		(1	)		8,965			1,468			—			(22,303	)
Cash—Beginning of period		39,436			9			25,032			616			—			65,093
Cash—End of period	$	6,701		$	8		$	33,997		$	2,084		$	—		$	42,790

Supplementary_Data_Unaudited

Supplementary Data (Unaudited)	12 Months Ended
	Dec. 28, 2013
Supplementary Data (Unaudited)	'
	(22) Supplementary Data (Unaudited)
	Supplemental financial information (unaudited) by quarter is as follows for the years ended 2013 and 2012:
			2013											2012
			4Q			3Q		2Q			1Q			4Q			3Q		2Q			1Q
	Revenue		$	238,267		$	316,263	$	254,842		$	106,829		$	231,634		$	319,181	$	255,556		$	119,883
	Operating (loss) income			(57,742	)		37,895		13,731			(41,861	)		13,322			33,249		9,015			(40,171	)
	(Loss) income from continuing operations			(70,191	)		22,950		244			(56,154	)		433			19,656		(5,621	)		(61,499	)
	Loss (income) from discontinued operations			271			160		(26	)		123			535			1,287		2,221			(497	)
	Net (loss) income		$	(70,462	)	$	22,790	$	270		$	(56,277	)	$	(102	)	$	18,369	$	(7,842	)	$	(61,002	)
Continental Cement Company, L.L.C. [Member]	'
Supplementary Data (Unaudited)	'
	-13	Supplementary Data (Unaudited)
	Supplemental financial information (unaudited) by quarter is as follows for the years ended December 28, 2013 and December 31, 2012:
			2013											2012
	(in thousands)		4Q			3Q		2Q			1Q			4Q			3Q		2Q			1Q
	Revenues		$	22,509		$	34,155	$	27,224		$	12,361		$	25,304		$	30,430	$	26,141		$	13,007
	Operating income (loss)			9,259			10,965		9,053			(8,449	)		7,625			7,124		9,097			(4,468	)
	Net income (loss)		$	6,668		$	8,157	$	6,272		$	(11,232	)	$	4,694		$	3,977	$	5,999		$	(8,045	)

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 28, 2013
Subsequent Events	'
	(23) Subsequent Events
	On January 17, 2014, Summit Materials and Summit Materials Finance Corp. issued and sold $260.0 million aggregate principal amount of their 10.5% Senior Notes due 2020 (the “Additional Notes”), which mature on January 31, 2020, pursuant to an indenture governing the $250.0 million aggregate principal amount of 10.5% Senior Notes due 2020 that were issued on January 30, 2012 (the “Existing Notes”). The Additional Notes are treated as a single series with the Existing Notes and have substantially the same terms as those of the Existing Notes. The Additional Notes and the Existing Notes will vote as one class under the Indenture. In addition, on January 16, 2014, the Senior Secured Credit Agreement was amended to allow for the issuance of the Additional Notes.
	On January 17, 2014, the Company completed its acquisition of Alleyton Resource Corporation, a Texas corporation, and Colorado Gulf, LP, a Texas limited partnership, and certain real property from Barten Shepard Investments, LP, a Texas limited partnership (“BSI”), collectively, referred to as “Alleyton”, for approximately $179.25 million, with an additional $30.75 million in deferred and contingent payments. The Alleyton acquisition consideration was funded through a portion of the net proceeds from the issue and sale of the Additional Notes.
Continental Cement Company, L.L.C. [Member]	'
Subsequent Events	'
	-14	Subsequent Events
	On January 17, 2014, Summit Materials and Summit Materials Finance Corp. issued and sold an additional $260.0 million aggregate principal amount of their 10.5% Senior Notes due 2020, which mature on January 31, 2020, pursuant to an indenture which also governs the $250.0 million aggregate principal amount of 10.5% Senior Notes due 2020 that were issued on January 30, 2012. As a result, the Company’s guarantee of the Senior Notes increased by the additional $260.0 million of notes issued to $510.0 million.

Accrued_Expenses

Accrued Expenses (Continental Cement Company, L.L.C. [Member])	12 Months Ended
	Dec. 28, 2013
Continental Cement Company, L.L.C. [Member]	'
Accrued Expenses	'
	-5	Accrued Expenses
	Accrued expenses consist of the following as of year-end 2013 and 2012:
			2013		2012
	Accrued interest due to Summit Materials		$	3,848	$	4,283
	Accrued interest due to non-controlling interest			723		2,149
	Accrued post-retirement benefits other than pensions, current portion			1,268		1,055
	Accrued professional fees			340		400
	Accrued payroll, insurance and benefits			758		897
	Accrued bonus liability			884		1,153
	Accrued costs to remove barge from waterway			880		850
	Other			1,296		736
	Total		$	9,997	$	11,523

LongTerm_Debt

Long-Term Debt (Continental Cement Company, L.L.C. [Member])	12 Months Ended
	Dec. 28, 2013
Continental Cement Company, L.L.C. [Member]	'
Long-Term Debt	'
	-6	Long-Term Debt
	Long-term debt, including the current portion of long-term debt, was $155.6 million and $156.4 million as of year-end 2013 and 2012, respectively. Interest costs incurred were $11.1 million, $12.6 million and $14.6 million for the years ended December 28, 2013, December 31, 2012 and December 31, 2011, respectively. The interest rate in effect at December 28, 2013 was 3.7%.
	On January 30, 2012, Summit Materials refinanced its consolidated outstanding indebtedness, including $142.7 million of the Company’s indebtedness and interest thereon, by issuing $250.0 million aggregate principal amount of 10.5% Senior Notes due January 31, 2020 (the “Senior Notes”) and borrowing under a senior secured credit facility composed of $422.0 million in term loans as of December 28, 2013 that mature January 30, 2019 and a $150.0 million revolving credit facility that matures January 30, 2017 (the “Senior Secured Credit Facility”). As a result of the January 2012 financing transactions, Continental Cement’s existing debt was repaid by Summit Materials and was replaced by $156.8 million of long-term debt due to Summit Materials. In addition, Continental Cement recognized a charge to earnings of $0.3 million related to financing fees on the debt repaid.
	The terms of Summit Materials’ debt limit certain transactions of its subsidiaries, including those of Continental Cement. Continental Cement’s ability to incur additional indebtedness or issue certain preferred shares, pay dividends to the noncontrolling members, 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 are limited.
	Continental Cement, excluding GAR, is named as a guarantor of Summit Materials’ debt, for which the Company pledged substantially all of its assets as collateral. Continental Cement, excluding GAR, provides a joint and several, full and unconditional guarantee of Summit Materials’ debt. Summit Materials is and has been current on all required principal and interest payments. As of December 28, 2013, approximately $95.3 million and $60.3 million of the Company’s long-term debt due to Summit Materials represent the amount of Summit Materials’ debt under the Senior Secured Credit facility and Senior Notes, respectively, that has been allocated to the Company.
	Future maturities of long-term debt due to Summit Materials as of December 28, 2013 are as follows:
	2014		$	1,018
	2015			1,018
	2016			1,273
	2017			1,018
	2018			764
	Thereafter			150,517
	Total		$	155,608

Members_Interest1

Members' Interest (Continental Cement Company, L.L.C. [Member])	12 Months Ended
	Dec. 28, 2013
Continental Cement Company, L.L.C. [Member]	'
Members' Interest	'
	-7	Members’ Interest
	Business affairs of the Company are managed by a board of directors (the “Board”) composed of up to seven Directors. As of December 28, 2013 and December 31, 2012, Summit Materials is entitled to appoint four directors to the Board and members representing the noncontrolling interest are entitled to appoint three directors to the Board. Any director may be removed from the Board with or without cause at any time by the directors entitled to appoint such Director.
	The LLC Agreement provides that resolutions of the Board generally require the consent of at least a majority of the Directors.
	The Company had 100 Class A Units issued and outstanding as of December 28, 2013 and December 31, 2012, all of which were indirectly held by Summit Materials. The Class A Units represent an approximately 70% economic interest in the Company and they have a preference in liquidation to the Class B Units. Class A Units are entitled to a priority distribution which accrues daily and compounds annually and requires that Continental Cement make distributions ahead of the Class B Units up to an amount equal to the capital contributions made by Summit Materials in respect to the Class A Units, plus interest on such capital contributions of 11%, to Class A Unit holders prior to making distributions to the Class B Unit holders. To the extent that the priority return is not made in a given year, the amount of the priority return will increase the liquidation preference of the Class A Units.
	The Company had 100,000,000 Class B Units issued and outstanding as of December 28, 2013 and December 31, 2012. The Class B Units represent an approximately 30% economic interest in the Company and are subordinate to the Class A Units.
	The LLC Agreement provides Summit Materials with the right to require the Company to call all of the Class B Units at a strike price that approximates fair value after May 27, 2016, either in anticipation of Summit Materials effecting an initial public offering or if an initial public offering has already occurred. In addition, subject to certain conditions, holders of the Class B Units have the right to require the Company to purchase all of the Class B Units at a strike price that approximates fair value, exercisable after May 27, 2012 if there is a change of control of Summit Materials or at any time after May 27, 2016. The LLC Agreement also includes transfer restrictions which prohibit the Class B Unit holders from transferring their Class B Units without the consent of the Board until May 27, 2015.
	Because the Class B Units can be put to the Company by the Class B Unit holders in the future based on the passage of time, which can be accelerated upon the occurrence of a contingent event, the noncontrolling members’ interest is classified in temporary equity. The redemption value is based upon the estimated fair value of Continental Cement, which is valued using Level 3 inputs. Continental Cement elected to accrete changes in the redemption value of the noncontrolling interest over the period from the date of issuance to the earliest anticipated redemption date of the instrument, which is currently May 2016, using an interest method. The accretion is recorded as an adjustment to retained earnings. The redemption value of the redeemable members’ interest as of year-end 2013 and 2012 approximated its carrying value.
	Net earnings or losses are generally allocated in a manner such that the capital account of each Member is equal to the distributions that would be made to such Member if the Company were dissolved, its affairs wound up, its assets and liabilities settled for cash and the net assets of the Company were distributed in accordance with the LLC Agreement.

Summary_of_Organization_and_Si1

Summary of Organization and Significant Accounting Policies (Policies)

12 Months Ended

Dec. 28, 2013

Principles of Consolidation

'

Principles of Consolidation—The consolidated financial statements include the accounts of the Company and its majority owned subsidiaries. All intercompany balances and transactions have been eliminated. The Company attributes consolidated member’s interests and net income separately to the controlling and noncontrolling interests. The Company accounts for investments in entities for which it has an ownership of 20% to 50% using the equity method of accounting.

Use of Estimates

'

Use of Estimates—The consolidated financial statements of the Company have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”), which require management to make estimates and assumptions that affect the reported amounts and disclosures in the consolidated financial statements. 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, goodwill, intangible and other long-lived assets, pension and other postretirement obligations, asset retirement obligations and the redeemable noncontrolling interest. Estimates also include revenue earned and costs to complete open contracts. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management adjusts such estimates and assumptions when circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from estimates made. Changes in estimates, including those resulting from continuing changes in the economic environment, will be reflected in the Company’s consolidated financial statements in the period in which the change in estimate occurs.

Business and Credit Concentrations

'

Business and Credit Concentrations—The majority of Summit Materials’ customers are located in Texas, Kansas, Kentucky, Missouri and Utah. Summit Materials’ accounts receivable consist primarily of amounts due from customers within these areas. Collection of these accounts is, therefore, dependent on the economic conditions in the aforementioned states. However, credit granted within Summit Materials’ trade areas has been granted to a wide variety of customers. Management does not believe that any significant concentrations of credit exist with respect to individual customers or groups of customers. No single customer accounted for more than 10% of revenue in 2013, 2012 or 2011.

Accounts Receivable

'

Accounts Receivable—Accounts receivable are stated at the amount management expects to collect from outstanding balances. Management provides for probable uncollectible amounts through a charge to earnings and a credit to a valuation allowance based on its assessment of the collectability of individual accounts. In establishing the allowance, management considers historical losses adjusted to take into account current market conditions and its customers’ financial condition, the amount of receivables in dispute, the current receivables aging and current payment terms. Balances that remain outstanding after reasonable collection efforts are exercised are written off through a charge to the valuation allowance.

The balances billed but not paid by customers, pursuant to retainage provisions included in contracts, will be due near or upon completion of the contracts.

Revenue and Cost Recognition

'

Revenue and Cost Recognition—Revenue for product sales are recognized when evidence of an arrangement exists, the fee is fixed or determinable, title passes, which is generally when the product is shipped, and collection is reasonably assured. Product revenue includes sales of aggregates, cement and other materials to customers, net of discounts, allowances or taxes, as applicable. Internal product sales are eliminated from service revenue in the consolidated statements of operations.

Revenue from construction contracts are included in service revenue and are recognized under the percentage-of-completion accounting method. The percent complete is measured by the cost incurred to date compared to the estimated total cost of each project. This method is used as management considers expended cost to be the best available measure of progress on these contracts, the majority of which are completed within one year, but may occasionally extend beyond one year. Inherent uncertainties in estimating costs make it at least reasonably possible that the estimates used will change within the near term and over the life of the contracts.

Contract costs include all direct material and labor costs and those indirect costs related to contract performance and completion. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are estimable. General and administrative costs are charged to expense as incurred.

Changes in job performance, job conditions and estimated profitability, including those arising from contract penalty provisions and final contract settlements, may result in revisions to costs and income. Such revisions are recognized in the period in which they are determined. An amount equal to contract costs incurred that are attributable to claims is included in revenue when realization is probable and the amount can be reliably estimated.

Costs and estimated earnings in excess of billings are composed principally of revenue recognized on contracts (on the percentage-of-completion method) for which billings had not been presented to customers because the amount were not billable under the contract terms at the balance sheet date. In accordance with the contract terms, the unbilled receivables at December 28, 2013 will be billed in 2014. Billings in excess of costs and estimated earnings represent billings in excess of revenue recognized.

Revenue from the receipt of waste fuels is classified as service revenue and is based on fees charged for the waste disposal, which are recognized when the waste is accepted.

Inventories

'

Inventories—Inventories consist of stone removed from quarries and processed for future sale, raw materials and finished concrete blocks. Inventories are valued at the lower of cost or market and are accounted for on a first-in first-out basis or an average cost basis. If items become obsolete or otherwise unusable or if quantities exceed what is projected to be sold within a reasonable period of time, they will be charged to costs of production in the period that the items are designated as obsolete or excess inventory. Stripping costs are costs of removing overburden and waste material to access aggregate materials and are recognized in cost of revenue in the same period as the revenue from the sale of the inventory.

Property, Plant and Equipment, net

'

Property, Plant and Equipment, net—Property, plant and equipment are recorded at cost, less accumulated depreciation, depletion and amortization. Expenditures for additions and improvements that significantly add to the productive capacity or extend the useful life of an asset are capitalized. Repair and maintenance costs that do not substantially add to the productive capacity or extend the useful life of the asset are expensed as incurred.

Landfill airspace is included in property, plant and equipment at cost and is amortized based on utilization of the asset. Management reassesses the landfill airspace capacity with any changes in value recorded in cost of revenue. Capitalized landfill costs include expenditures for the acquisition of land and related airspace, engineering and permitting costs, cell construction costs and direct site improvement costs.

Upon disposal, the cost and related accumulated depreciation are removed from the Company’s accounts and any gain or loss is included in general and administrative expenses.

Depreciation on property, plant and equipment, including assets subject to capital leases, is computed on a straight-line basis or based on the economic usage over the estimated useful life of the asset. The estimated useful lives are generally as follows:

Buildings and improvements

7–40 years

Plant, machinery and equipment

3–40 years

Truck and auto fleet

3–10 years

Mobile equipment and barges

3–20 years

Landfill airspace and improvements

5–60 years

Depletion of mineral reserves is calculated for proven and probable reserves by the units of production method on a site-by-site basis. Leasehold improvements are amortized on a straight-line basis over the lesser of the asset’s useful life or the remaining lease term.

The Company reviews the carrying value of property, plant and equipment for impairment whenever events or circumstances indicate that the carrying value of an asset may not be recoverable from the estimated future cash flows expected to result from its use and eventual disposition. Such indicators may include, among others, deterioration in general economic conditions, adverse changes in the markets in which an entity operates, increases in input costs that have a negative effect on earnings and cash flows or a trend of negative or declining cash flows over multiple periods. In addition, assets are assessed for impairment charges when identified for disposition. Projected losses from disposition are recognized in the period in which they become estimable, which may be in advance of the actual disposition. The net loss from asset dispositions recognized in general and administrative expenses in fiscal years 2013, 2012 and 2011 was $12.4 million, $2.6 million and $2.3 million, respectively. No material impairment charges have been recognized on assets held for use in 2013, 2012 or 2011. The losses are commonly a result of the cash flows expected from selling the asset being less than the expected cash flows that could be generated from holding the asset for use.

Accrued Mining and Landfill Reclamation

'

Accrued Mining and Landfill Reclamation—The mining reclamation reserve and financial commitments for landfill closure and post-closure activities are based on management’s estimate of future cost requirements to reclaim property at both currently operating and closed sites. Estimates of these obligations have been developed based on management’s interpretation of current requirements and proposed regulatory changes and are intended to approximate fair value. Costs are estimated in current dollars, inflated until the expected time of payment, using an inflation rate of 2.5%, and then discounted back to present value using a credit-adjusted, risk-free rate on obligations of similar maturity, adjusted to reflect the Company’s credit rating. Changes in the credit-adjusted, risk-free rate do not change recorded liabilities. However, subsequent increases in the recognized obligations are measured using a current credit-adjusted, risk-free rate. Decreases in the recognized obligations are measured at the initial credit-adjusted, risk-free rate.

Significant changes in inflation rates or the amount or timing of future cost estimates typically result in both (1) a current adjustment to the recorded liability (and corresponding adjustment to the asset) and (2) a change in accretion of the liability and depreciation of the asset to be recorded prospectively over the remaining capacity of the unmined quarry or landfill.

Intangible Assets

'

Intangible Assets—The Company’s intangible assets are primarily composed of lease agreements, reserve rights and trade names. The assets related to lease agreements are a result of the submarket royalty rates paid under agreements, primarily, for extracting aggregate. The values were determined as of the respective acquisition dates by a comparison of market-royalty rates to contract-royalty rates. The reserve rights relate to aggregate reserves to which the Company has the rights of ownership, but do not own the reserves. The intangible assets are amortized on a straight-line basis over the lives of the leases. Continental Cement’s trade name composes the majority of the remaining intangible assets. The following table shows intangible assets by type and in total:

December 28, 2013

December 29, 2012

Gross

Accumulated

Net

Gross

Accumulated

Net

Carrying

Amortization

Carrying

Carrying

Amortization

Carrying

Amount

Amount

Amount

Amount

Leases

$

10,430

$

(1,604

)

$

8,826

$

8,940

$

(1,092

)

$

7,848

Reserve rights

5,890

(221

)

5,669

—

—

—

Trade names

1,020

(368

)

652

1,020

(262

)

758

Total intangible assets

$

17,340

$

(2,193

)

$

15,147

$

9,960

$

(1,354

)

$

8,606

Amortization expense in 2013, 2012 and 2011 was $0.8 million, $0.6 million and $0.5 million, respectively. The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows:

2014

$

897

2015

897

2016

897

2017

893

2018

893

Thereafter

10,670

Total

$

15,147

Goodwill

'

Goodwill—Goodwill represents the purchase price paid in excess of the fair value of net tangible and intangible assets acquired. Goodwill recorded in connection with the Company’s acquisitions is primarily attributable to the expected profitability, assembled workforces of the acquired businesses and the synergies expected to arise after the Company’s acquisition of those businesses. Goodwill is not amortized, but is tested annually for impairment as of the first day of the fourth quarter and whenever events or circumstances indicate that goodwill may be impaired. The test for goodwill impairment is a two-step process to first identify potential goodwill impairment for each reporting unit and then, if necessary, measure the amount of the impairment loss. Goodwill is tested for impairment based on the Company’s operating companies, which management has determined to be the Company’s reporting units, which are one level below its segments in the Central and West regions. The East region is considered to be a single reporting unit.

Income Taxes

'

Income Taxes—As a limited liability company, Summit Materials’ federal and state income tax attributes are generally passed to Parent. However, certain of the Company’s subsidiaries are taxable entities, the provisions for which are included in the consolidated financial statements. For the Company’s taxable entities, deferred income tax assets and liabilities are computed for differences between the tax basis and financial statement amounts that will result in taxable or deductible amounts in the future based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. A valuation allowance is recognized for deferred tax assets if it is more likely than not that some portion or all of the net deferred tax assets will not be realized.

The Company evaluates the tax positions taken on income tax returns that remain open to examination by the respective tax authorities from prior years and positions expected to be taken on the current year tax returns to identify uncertain tax positions. Interest and penalties are recorded in income tax expense.

Fair Value Measurements

'

Fair Value Measurements—The fair value accounting guidance establishes the following fair value hierarchy that prioritizes the inputs used to measure fair value:

Level 1

—

Unadjusted quoted prices for identical assets or liabilities in active markets.

Level 2

—

Inputs other than Level 1 that are based on observable market data, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in inactive markets, inputs that are observable that are not prices and inputs that are derived from or corroborated by observable markets.

Level 3

—

Valuations developed from unobservable data, reflecting the Company’s own assumptions, which market participants would use in pricing the asset or liability.

Assets and liabilities measured at fair value in the consolidated balance sheets as of year-end 2013 and 2012 are as follows:

2013

2012

Accrued expenses:

Current portion of contingent consideration

$

—

$

746

Acquisition- related liabilities

Contingent consideration

$

1,908

$

1,908

Certain acquisitions made by the Company require the payment of additional consideration contingent upon the achievement of specified operating results, referred to as contingent consideration or earn-out obligations. These payments will not be made if earn-out thresholds are not achieved. No material earn-out payments have been made to date.

Summit Materials records contingent consideration at fair value on the acquisition date and then measures its fair value each reporting period. Any adjustments to fair value are recognized in earnings in the period identified. Management of the Company determines the appropriate policies and procedures to be used when determining the fair value of contingent consideration. Its fair values are based on unobservable inputs, or Level 3 inputs, including projected probability-weighted cash payments and an 8.4% discount rate, which reflects the Company’s credit risk. 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 significantly lower, or higher, fair value measurement. In 2012 and 2011, we recognized reductions to contingent consideration of $0.4 million and $10.3 million, respectively, due primarily to revised estimates of the probability of achieving the specified targets.

Financial Instruments

'

Financial Instruments—The Company’s financial instruments include certain acquisition-related liabilities (deferred consideration and noncompete obligations) and debt. The fair value of the deferred consideration and noncompete obligations approximate their carrying value of $28.3 million and $4.2 million, respectively, as of December 28, 2013 and $23.4 million and $7.4 million, respectively, as of December 29, 2012. The fair value was determined based on Level 3 inputs, including the cash payment terms in the purchase agreements and a discount rate reflecting the Company’s credit risk.

The fair value of long-term debt was approximately $696.5 million and $670.7 million as of December 28, 2013 and December 29, 2012, respectively, compared to its carrying value of $663.0 million and $639.8 million, respectively. Fair value was determined based on Level 2 inputs, including observable inputs, specifically quoted prices for these instruments in inactive markets. The fair value of Company’s revolving credit facility approximated its carrying value of $26.0 million at December 28, 2013.

Reclassifications

'

Reclassifications—Certain amounts have been reclassified in prior periods to conform to the presentation in the consolidated financial statements as of and for the year ended December 28, 2013.

Continental Cement Company, L.L.C. [Member]

'

Principles of Consolidation

'

(b)

Principles of Consolidation

The consolidated financial statements of the Company include the accounts of Continental Cement and its wholly owned subsidiary, GAR. All significant intercompany balances and transactions have been eliminated.

Use of Estimates

'

(c)

Use of Estimates

The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), which require management to make estimates and assumptions that affect the reported amounts and disclosures in the consolidated financial statements. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and reported amounts of expenses. Such estimates include the valuation of accounts receivable, inventories, goodwill, intangible and other long-lived assets, pension and other postretirement obligations, asset retirement obligations and the redeemable members’ interest. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management adjusts such estimates and assumptions when circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from estimates made. Changes in estimates, including those resulting from continuing changes in the economic environment, will be reflected in the Company’s consolidated financial statements in the period in which the change in estimate occurs.

Business and Credit Concentrations

'

(d)

Business and Credit Concentrations

The Company’s customers are primarily located in Missouri, Iowa and Illinois. The Company’s accounts receivable balances are due primarily from ready-mixed concrete and concrete products producers and contractors within this area. Collection of these accounts is, therefore, dependent on the economic conditions of the area. However, credit granted within the Company’s trade area has been granted to a wide variety of customers, and management does not believe that any significant concentrations of credit exist with respect to individual customers or groups of customers who are engaged in similar activities that would be similarly affected by changes in economic or other conditions. The Company had approximately 16%, 13% and 14%, of cement sales with companies owned by a certain minority owner of the Company for the years ended December 28, 2013, December 31, 2012 and December 31, 2011, respectively.

Accounts Receivable

'

(e)

Accounts Receivable

Accounts receivable is stated at the amount management expects to collect from outstanding balances. Management provides for probable uncollected amounts through a charge to earnings and a credit to the allowance for doubtful accounts based on its assessment of the status of individual accounts. In establishing the allowance, management considers historical losses adjusted to take into account current market conditions and the Company’s customers’ financial condition, the amount of receivables in dispute, the current receivables aging and current payment terms. Balances that are still outstanding after management has used reasonable collection efforts are written off through a charge to the allowance for doubtful accounts. Changes in the allowance for doubtful accounts have not been material to the consolidated financial statements.

Inventories

'

(g)

Inventories

Inventories of raw materials, work in process and finished goods are carried at the lower of cost (determined using the average cost method) or market. If items become obsolete or otherwise unusable, they will be charged to costs of production when that determination is made by management.

Property, Plant and Equipment, net

'

(h)

Property, Plant and Equipment, net

Property, plant and equipment are recorded at cost, less accumulated depreciation and depletion. Expenditures for additions and improvements that significantly add to the productive capacity or extend the useful life of an asset are capitalized. Repair and maintenance costs that do not substantially extend the life of the Company’s property, plant and equipment are expensed as incurred.

Upon disposal, the cost and related accumulated depreciation are removed from the Company’s accounts and any gain or loss is included in operating income.

Depreciation on property, plant and equipment is computed on a straight-line basis. These estimated useful lives are as follows:

Building and improvements

30 – 40 years

Plant, machinery and equipment

3 – 40 years

Mobile equipment and barges

3 – 20 years

Other

3 – 7 years

Depletion of mineral reserves is calculated over proven and probable reserves by the units of production method on a site-by-site basis.

The Company reviews the carrying value of property, plant and equipment for impairment whenever events or circumstances indicate that the carrying value of an asset may not be recoverable from the estimated future cash flows expected to result from its use and eventual disposition. Such indicators may include, among others, deterioration in general economic conditions, negative developments in equity and credit markets, adverse changes in the markets in which an entity operates, increases in input costs that have a negative effect on earnings and cash flows or a trend of negative or declining cash flows over multiple periods.

Goodwill

'

(j)

Goodwill

Goodwill is the excess of cost over the fair value of net assets of businesses acquired and was $24.1 million as of December 28, 2013 and December 31, 2012. Goodwill is not amortized, but is tested annually for impairment and whenever events or circumstances change that would make it more likely than not that an impairment may have occurred.

Continental Cement performs an annual impairment analysis as of the first day of the fourth quarter of each fiscal year for its one reporting unit. The first step of the goodwill impairment test compares the fair value of the reporting unit to its carrying value. Management estimates the fair value of the reporting unit primarily based on the discounted projected cash flows of the underlying operations. A number of significant assumptions and estimates are required to forecast operating cash flows, including macroeconomic trends in the private construction and public infrastructure industries, expected success in securing future sales and the appropriate interest rate used to discount the projected cash flows. During the 2013 and 2012 annual reviews of goodwill, management concluded that the estimated fair value of the reporting unit was substantially in excess of its carrying value, resulting in no indication of impairment. The Company has recorded no goodwill impairment charges to date.

Income Taxes

'

(k)

Income Taxes

Continental Cement and GAR are limited liability companies that pass their tax attributes for federal and state tax purposes to their members and are generally not subject to federal or state income tax.

Reclassifications

'

(m)

Reclassifications

Certain amounts have been reclassified in prior periods to conform to the presentation in the consolidated financial statements as of and for the year ended December 28, 2013.

Business Activities and Organization

'

(a)

Business Activities and Organization

Continental Cement Company, L.L.C. (the “Company” or “Continental Cement”) produces Portland cement at its plant located in Hannibal, Missouri. Cement distribution terminals are maintained in Hannibal and St. Louis, Missouri and Bettendorf, Iowa. The Company’s primary customers are ready-mixed concrete and concrete products producers and contractors located in the Midwestern United States.

Green America Recycling, L.L.C. (“GAR”), a wholly owned subsidiary of the Company, is engaged in the business of securing, processing and blending hazardous and nonhazardous waste materials primarily for use as supplemental fuels in Continental Cement’s manufacturing process. GAR’s primary customers are commercial transportation disposal facilities and petroleum and chemical manufacturers located in the continental United States.

The Company, a Delaware limited liability company, is governed by the Amended and Restated Continental Cement Limited Liability Company Agreement (as amended, the “LLC Agreement”). As such, liability of the Company’s members is generally limited to the amount of their net investment in the Company. Continental Cement is an indirect non–wholly owned subsidiary of Summit Materials, LLC (“Summit Materials”).

In 2013, Continental Cement changed its fiscal year from a calendar year to a 52-week year with each quarter composed of 13 weeks ending on a Saturday, consistent with that of Summit Materials. Continental Cement’s fiscal year end in 2013 was December 28 compared to the calendar year ended December 31 in 2012 and 2011. The effect of this change to Continental Cement’s financial position, results of operations and liquidity was immaterial.

Revenue Recognition

'

(f)

Revenue Recognition

Revenue from the sale of cement is recognized when evidence of an arrangement exists, the fee is fixed or determinable, title passes, which is generally when the product is shipped, and collection is reasonably assured. Cement sales are recorded net of discounts, allowances and sales taxes, as applicable. The Company records freight revenue on a net basis together with freight costs within cost of sales.

Revenue from the receipt of waste fuels is recognized when the waste is accepted and a corresponding liability is recognized for the costs to process the waste into fuel for the manufacturing of cement or to ship the waste offsite for disposal in accordance with applicable regulations.

Accrued Mining Reclamation

'

(i)

Accrued Mining Reclamation

The mining reclamation obligations are based on management’s estimate of future cost requirements to reclaim property at quarry sites. Estimates of these obligations have been developed based on management’s interpretation of current requirements and proposed regulatory changes and are intended to approximate fair value. Costs are estimated in current dollars, inflated until the expected time of payment, using an inflation rate of 2.5%, and then discounted back to present value using a risk-free rate on obligations of similar maturity, adjusted to reflect the Company’s credit rating. Changes in the credit-adjusted, risk-free rate do not change recorded liabilities. However, subsequent increases in the recognized obligations are measured using a current credit-adjusted, risk-free rate. Decreases in the recognized obligations are measured at the initial credit-adjusted, risk-free rate.

Significant changes in inflation rates or the amount or timing of future cost estimates typically result in both (1) a current adjustment to the recorded liability (and corresponding adjustment to the asset) and (2) a change in accretion of the liability and depreciation of the asset to be recorded prospectively over the remaining capacity of the unmined quarry.

Summary_of_Organization_and_Si2

Summary of Organization and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 28, 2013
Estimated Useful Lives of Assets	'
	The estimated useful lives are generally as follows:
	Buildings and improvements		7–40 years
	Plant, machinery and equipment		3–40 years
	Truck and auto fleet		3–10 years
	Mobile equipment and barges		3–20 years
	Landfill airspace and improvements		5–60 years
Intangible Assets by Type and in Total	'
	The following table shows intangible assets by type and in total:
		December 28, 2013							December 29, 2012
		Gross		Accumulated			Net		Gross		Accumulated			Net
		Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
		Amount					Amount		Amount					Amount
	Leases	$	10,430	$	(1,604	)	$	8,826	$	8,940	$	(1,092	)	$	7,848
	Reserve rights		5,890		(221	)		5,669		—		—			—
	Trade names		1,020		(368	)		652		1,020		(262	)		758
	Total intangible assets	$	17,340	$	(2,193	)	$	15,147	$	9,960	$	(1,354	)	$	8,606
Estimated Amortization Expense for Intangible Assets	'
	The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows:
	2014	$	897
	2015		897
	2016		897
	2017		893
	2018		893
	Thereafter		10,670
	Total	$	15,147
Assets and Liabilities Measured at Fair Value	'
	Assets and liabilities measured at fair value in the consolidated balance sheets as of year-end 2013 and 2012 are as follows:
		2013		2012
	Accrued expenses:
	Current portion of contingent consideration	$	—	$	746
	Acquisition- related liabilities
	Contingent consideration	$	1,908	$	1,908
Continental Cement Company, L.L.C. [Member]	'
Estimated Useful Lives of Assets	'
	These estimated useful lives are as follows:
	Building and improvements		30 – 40 years
	Plant, machinery and equipment		3 – 40 years
	Mobile equipment and barges		3 – 20 years
	Other		3 – 7 years

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 28, 2013
Business Combinations [Abstract]	'
Schedule of Supplemental Pro Forma Information of Acquisitions	'
	Pro Forma Financial Information—The following unaudited supplemental pro forma information presents the financial results as if the 2012 acquisitions occurred on January 1, 2011. This supplemental pro forma information has been prepared for comparative purposes and does not purport to be indicative of what would have occurred had the acquisitions been made on January 1, 2011, nor is it indicative of any future results. The 2013 acquisitions were not material individually or in the aggregate.
			Year ended
			December 28, 2013			December 29, 2012
	Revenue		$	916,201		$	976,797
	Net loss			(103,679	)		(45,976	)
Summary of Fair Value of Assets Acquired and Liabilities Assumed	'
	The following table summarizes aggregated information regarding the fair values of the assets acquired and liabilities assumed as of the respective acquisition dates in 2013 and 2012:
			2013			2012
	Financial assets		$	8,302		$	1,397
	Inventories			3,954			6,988
	Property, plant and equipment			40,580			21,543
	Other assets			52			1,330
	Intangible assets(1)			7,428			3,172
	Financial liabilities			(6,164	)		(944	)
	Other long-term liabilities			(1,050	)		(364	)
	Net assets acquired			53,102			33,122
	Goodwill			16,120			26,230
	Total purchase price			69,222			59,352
	Noncash transactions:
	Acquisition related liabilities			(7,902	)		(10,547	)
	Other			281			(48	)
	Total noncash transactions			(7,621	)		(10,595	)
	Net cash paid for acquisitions		$	61,601		$	48,757
	-1	Intangible assets acquired relate to aggregate reserves to which the Company has the rights of ownership, but do not own the reserves ($5.9 million) and the differential between contractual lease rates and market rates for leases of aggregate reserves and office space. The acquired intangible assets in total, the reserve rights and the lease assets have weighted-average lives of 18 years, 20 years and 11 years, respectively.

Goodwill_Tables

Goodwill (Tables)	12 Months Ended
	Dec. 28, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill by Reportable Segment and in Total	'
	The following table presents goodwill by reportable segments and in total:
		Central		West			East			Total
	Beginning Balance—December 31, 2011	$	53,585	$	91,598		$	8,192		$	153,375
	Acquisitions		19,204		(205	)		6,746			25,745
	Balance, December 29, 2012		72,789		91,393			14,938			179,120
	Acquisitions		—		16,120			—			16,120
	Impairment		—		(53,264	)		(14,938	)		(68,202	)
	Balance, December 28, 2013	$	72,789	$	54,249		$	—		$	127,038

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 28, 2013
Discontinued Operations And Disposal Groups [Abstract]	'
Revenue and Loss before Income Tax Expense from Discontinued Operations	'
	The railroad, environmental remediation and concrete paving businesses’ revenue and loss before income tax expense, including an immaterial gain on sale, in fiscal years 2013, 2012 and 2011 are summarized below:
		2013		2012		2011
	Total revenue	$	3,884	$	50,152	$	49,537
	Loss from discontinued operations before income tax expense		528		3,546		5,201

Accounts_Receivable_Net_Tables

Accounts Receivable, Net (Tables)	12 Months Ended
	Dec. 28, 2013
Summary of Accounts Receivable, Net	'
	Accounts receivable, net consists of the following as of year-end 2013 and 2012:
		2013			2012
	Trade accounts receivable	$	85,188		$	88,637
	Retention receivables		15,966			13,181
	Receivables from related parties		202			1,871
	Accounts receivable		101,356			103,689
	Less: Allowance for doubtful accounts		(2,019	)		(3,391	)
	Accounts receivable, net	$	99,337		$	100,298
Continental Cement Company, L.L.C. [Member]	'
Summary of Accounts Receivable, Net	'
	Accounts receivable, net consists of the following as of year-end 2013 and 2012:
		2013			2012
	Trade accounts receivable from unaffiliated entities	$	6,961		$	8,859
	Trade accounts receivable from related parties		422			1,193
	Accounts receivable		7,383			10,052
	Less: allowance for doubtful accounts		(30	)		(128	)
	Accounts receivable, net	$	7,353		$	9,924

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Dec. 28, 2013
Components of Inventories	'
	Inventories consist of the following as of year-end 2013 and 2012:
		2013		2012
	Aggregate stockpiles	$	70,300	$	62,872
	Finished goods		11,207		9,342
	Work in process		2,623		2,679
	Raw materials		12,302		18,084
	Total	$	96,432	$	92,977
Continental Cement Company, L.L.C. [Member]	'
Components of Inventories	'
	Inventories consist of the following as of year-end 2013 and 2012:
		2013		2012
	Raw materials	$	972	$	475
	Work-in-process		2,623		2,248
	Finished goods		6,807		4,350
	Total inventories	$	10,402	$	7,073

Property_Plant_and_Equipment_n1

Property, Plant and Equipment, net (Tables)	12 Months Ended
	Dec. 28, 2013
Components of Property, Plant and Equipment	'
	Property, plant and equipment, net consist of the following as of year-end 2013 and 2012:
		2013			2012
	Land (mineral bearing) and asset retirement costs	$	107,007		$	106,135
	Land (non-mineral bearing)		81,331			69,560
	Buildings and improvements		77,535			78,168
	Plants, machinery and equipment		680,942			623,949
	Truck and auto fleet		19,165			19,399
	Landfill airspace and improvements		46,841			46,841
	Construction in progress		29,560			20,734
	Other		1,779			5,134
	Property, plant and equipment		1,044,160			969,920
	Less accumulated depreciation, depletion and amortization		(212,382	)		(156,313	)
	Property, plant and equipment, net	$	831,778		$	813,607
Continental Cement Company, L.L.C. [Member]	'
Components of Property, Plant and Equipment	'
	Property, plant and equipment, net consist of the following as of year-end 2013 and 2012:
		2013			2012
	Land (non-mineral bearing)	$	4,605		$	4,605
	Land (mineral bearing) and asset retirement costs		16,524			15,449
	Buildings and improvements		40,795			40,681
	Plants, machinery and equipment		247,681			231,454
	Mobile equipment and barges		8,060			7,859
	Construction in progress		23,394			15,301
	Other		1,845			1,373
	Property, plant and equipment		342,904			316,722
	Less accumulated depreciation, depletion and amortization		(36,700	)		(25,056	)
	Property, plant and equipment, net	$	306,204		$	291,666

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 28, 2013
Schedule of Debt	'
	Debt as of year-end 2013 and 2012 are summarized as follows:
		2013			2012
	Senior secured credit facility, revolver due 2017	$	26,000		$	—
	Long-term debt:
	$250.0 million senior notes, net of discount of $4.0 million at December 28, 2013 and $4.7 million at December 29, 2012	$	245,971		$	245,303
	$419.9 million senior secured credit facility, term loan net of discount of $2.9 million at December 28, 2013 and $3.5 million at December 29, 2012		417,016			394,540
	Total		662,987			639,843
	Current portion of long-term debt		4,220			4,000
	Long-term debt	$	658,767		$	635,843
Schedule of Contractual Payments Long-Term Debt	'
	The total contractual payments of long-term debt for the five years subsequent to December 28, 2013 are as follows:
	2014	$	4,220
	2015		4,220
	2016		5,275
	2017		4,220
	2018		3,165
	Thereafter		648,790
	Total		669,890
	Less: Original issue discount		(6,903	)
	Total debt	$	662,987
Continental Cement Company, L.L.C. [Member]	'
Schedule of Contractual Payments Long-Term Debt	'
	Future maturities of long-term debt due to Summit Materials as of December 28, 2013 are as follows:
	2014	$	1,018
	2015		1,018
	2016		1,273
	2017		1,018
	2018		764
	Thereafter		150,517
	Total	$	155,608

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 28, 2013
Income Tax Disclosure [Abstract]	'
Components of Income Tax (Benefit) Expense	'
	For the years ended 2013, 2012 and 2011, income taxes consist of the following:
		2013			2012			2011
	Provision for income taxes:
	Current	$	1,761		$	(452	)	$	5,382
	Deferred		(4,408	)		(3,468	)		(1,974	)
	Income tax (benefit) expense	$	(2,647	)	$	(3,920	)	$	3,408
Schedule of Income Tax Provision (Benefit)	'
	The effective tax rate on pre-tax income differs from the U.S. statutory rate due to the following:
		2013			2012			2011
	Income tax benefit at federal statutory tax rate	$	(37,160	)	$	(19,074	)	$	(6,895	)
	Book loss not subject to income tax		32,801			16,167			13,790
	State and local income taxes		130			(90	)		666
	Depletion expense		(411	)		(377	)		(372	)
	Domestic production activities deduction		—			—			(273	)
	Goodwill impairment		1,046			—			—
	Bargain purchase gain		—			—			(4,250	)
	Effective rate change		—			(532	)		627
	Valuation allowance		729			36			(360	)
	Other		218			(50	)		475
	Income tax (benefit) provision	$	(2,647	)	$	(3,920	)	$	3,408
Components of Net Deferred Income Tax Liability	'
	The following table summarizes the components of the net deferred income tax liability as of year-end 2013 and 2012:
		2013			2012
	Deferred tax assets (liabilities):
	Mining reclamation reserve	$	1,502		$	1,449
	Accelerated depreciation		(33,146	)		(34,733	)
	Net operating loss		2,227			2,134
	Capital losses on securities		997			989
	Landfill closure reserve		(63	)		(30	)
	Working capital (e.g., accrued compensation, prepaid assets)		2,399			3,101
	Deferred tax liabilities, net		(26,084	)		(27,090	)
	Less valuation allowance on loss carryforwards		(1,826	)		(1,025	)
	Total	$	(27,910	)	$	(28,115	)
	Included in accompanying consolidated balance sheets under the following captions:
	Other current assets	$	2,316		$	2,275
	Other noncurrent liability		(30,226	)		(30,390	)
	Total	$	(27,910	)	$	(28,115	)

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 28, 2013
Obligations and Funded Status	'
	Obligations and Funded Status—The following information is as of year-end 2013 and 2012 and for the years ended December 28, 2013, December 29, 2012 and December 31, 2011:
		2013							2012
		Pension			Other				Pension			Other
		benefits			benefits				benefits			benefits
	Change in benefit obligations:
	Beginning of period	$	28,674		$	15,810			$	26,514		$	14,467
	Service cost		295			236				276			207
	Interest cost		963			513				1,055			585
	Actuarial (gain) loss		(2,674	)		(1,048	)			2,347			1,597
	Special termination benefits		—			39				—			—
	Benefits paid		(1,614	)		(1,395	)			(1,518	)		(1,046	)
	End of period		25,644			14,155				28,674			15,810
	Change in fair value of plan assets:
	Beginning of period		17,863			—				16,639			—
	Actual return on plan assets		1,512			—				1,205			—
	Employer contributions		1,313			1,395				1,537			1,046
	Benefits paid		(1,614	)		(1,395	)			(1,518	)		(1,046	)
	End of period		19,074			—				17,863			—
	Funded status of plans	$	(6,570	)	$	(14,155	)		$	(10,811	)	$	(15,810	)
	Current liabilities	$	—		$	(1,268	)		$	—		$	(1,055	)
	Noncurrent liabilities		(6,570	)		(12,887	)			(10,811	)		(14,755	)
	Liability recognized	$	(6,570	)	$	(14,155	)		$	(10,811	)	$	(15,810	)
	Amounts recognized in accumulated other comprehensive income:
	Net actuarial loss	$	4,831		$	4,139			$	8,056		$	5,501
	Prior service cost		—			(1,346	)			—			(1,526	)
	Total amount recognized	$	4,831		$	2,793			$	8,056		$	3,975
Amounts Recognized in Other Comprehensive (Gain) Loss	'
		2013							2012						2011
		Pension			Other				Pension			Other			Pension			Other
		benefits			benefits				benefits			benefits			benefits			benefits
	Amounts recognized in other comprehensive (gain) loss:
	Net actuarial (gain) loss	$	(2,838	)	$	(1,048	)		$	2,444		$	1,597		$	4,066		$	3,390
	Prior service cost		—			180				—			—			—			(1,705	)
	Amortization of prior year service cost		—			—				—			180			—			—
	Amortization of (gain) loss		(387	)		(314	)			(261	)		(312	)		(5	)		(71	)
	Total amount recognized	$	(3,225	)	$	(1,182	)		$	2,183		$	1,465		$	4,061		$	1,614
Components of Net Periodic Benefit Cost	'
		2013							2012						2011
		Pension			Other				Pension			Other			Pension			Other
		benefits			benefits				benefits			benefits			benefits			benefits
	Amounts recognized in other comprehensive (gain) loss:
	Net actuarial (gain) loss	$	(2,838	)	$	(1,048	)		$	2,444		$	1,597		$	4,066		$	3,390
	Prior service cost		—			180				—			—			—			(1,705	)
	Amortization of prior year service cost		—			—				—			180			—			—
	Amortization of (gain) loss		(387	)		(314	)			(261	)		(312	)		(5	)		(71	)
	Total amount recognized	$	(3,225	)	$	(1,182	)		$	2,183		$	1,465		$	4,061		$	1,614
	Components of net periodic benefit cost:
	Service cost	$	295		$	236			$	276		$	207		$	275		$	227
	Interest cost		963			513				1,055			585			1,161			710
	Amortization of loss		387			314				262			312			5			69
	Expected return on plan assets		(1,348	)		—				(1,301	)		(180	)		(1,400	)		—
	Special termination benefits		—			39				—			—			—			—
	Amortization of prior service credit		—			(180	)			—			—			—			—
	Net periodic benefit cost	$	297		$	922			$	292		$	924		$	41		$	1,006
Weighted-Average Assumptions Used to Determine Benefit Obligations	'
	Assumptions—Weighted-average assumptions used to determine the benefit obligations as of year-end 2013 and 2012 are:
		2013			2012
		Pension		Other	Pension		Other
		benefits		benefits	benefits		benefits
	Discount rate	4.21% - 4.46%		4.33%	3.30% - 3.57%		3.41%
	Expected long-term rate of return on plan assets	7.50%		N/A	7.50%		N/A
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost	'
	Weighted-average assumptions used to determine net periodic benefit cost for years ended December 28, 2013, December 29, 2012 and December 31, 2011:
		2013			2012				2011
		Pension		Other	Pension		Other		Pension		Other
		benefits		benefits	benefits		benefits		benefits		benefits
	Discount rate	3.30% - 3.57%		3.41%	3.89% - 4.07%		4.00%		4.94% - 5.12.%		5.07%
	Expected long-term rate of return on plan assets	7.50%		N/A	7.50%		N/A		8.50%		N/A
Effects of One Percentage-Point Change in Assumed Health Care Cost Trend Rates	'
	A one percentage-point change in assumed health care cost trend rates would have the following effects as of year-end 2013 and 2012:
		2013							2012
		Increase			Decrease				Increase			Decrease
	Total service cost and interest cost components	$	66		$	(55	)		$	73		$	(63	)
	Estimated APBO		1,251			(1,073	)			1,555			(1,331	)
Fair Value of Company's Pension Plans' Assets	'
	The fair value of the Company’s pension plans’ assets by asset class and fair value hierarchy level as of year-end 2013 and 2012 are as follows:
		2013
		Total fair			Quoted prices in active				Observable
		value			markets for identical				inputs (Level 2)
					assets (Level 1)
	Fixed income securities:
	Intermediate—government	$	1,647		$	—			$	1,647
	Intermediate—corporate		3,138			—				3,138
	Short-term—government		2,168			—				2,168
	Short-term—corporate		4,040			—				4,040
	Equity securities:
	U.S. Large cap value		1,221			1,221				—
	U.S. Large cap growth		1,536			1,536				—
	U.S. Mid cap value		600			600				—
	U.S. Mid cap growth		603			603				—
	U.S. Small cap value		610			610				—
	U.S. Small cap growth		599			599				—
	International		889			889				—
	Cash		1,665			1,665				—
	Precious metals		358			358				—
	Total	$	19,074		$	8,081			$	10,993
		2012
		Total fair			Quoted prices in active				Observable
		value			markets for identical				inputs (Level 2)
					assets (Level 1)
	Fixed income securities:
	Intermediate—government	$	1,247		$	—			$	1,247
	Intermediate—corporate		4,402			—				4,402
	Short-term—government		2,038			—				2,038
	Short-term—corporate		3,123			—				3,123
	Equity securities:
	U.S. Large cap value		1,063			1,063				—
	U.S. Large cap growth		1,037			1,037				—
	U.S. Mid cap value		542			542				—
	U.S. Mid cap growth		536			536				—
	U.S. Small cap value		546			546				—
	U.S. Small cap growth		539			539				—
	International		1,134			1,134				—
	Cash		1,656			1,656				—
	Total	$	17,863		$	7,053			$	10,810
Estimated Benefit Payments	'
	The estimated benefit payments for each of the next five years and the five-year period thereafter are as follows:
		Pension			Other
		benefits			benefits
	2014	$	1,694		$	1,269
	2015		1,704			1,109
	2016		1,739			1,130
	2017		1,737			963
	2018		1,774			1,018
	2019 - 2023		8,667			4,512
	Total	$	17,315		$	10,001
Continental Cement Company, L.L.C. [Member]	'
Weighted-Average Assumptions Used to Determine Benefit Obligations	'
	Assumptions—Weighted-average assumptions used to determine the benefit obligations as of year-end 2013 and 2012 are:
		2013					2012
		Pension			Other		Pension				Other
		benefits			benefits		benefits				benefits
	Discount rate		4.21% - 4.46%		4.33%			3.30% - 3.57%			3.41%
	Expected long-term rate of return on plan assets		7.5	%	N/A			7.5	%		N/A
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost	'
	Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 28, 2013, December 31, 2012 and December 31, 2011:
		2013							2012						2011
		Pension			Other				Pension			Other			Pension			Other
		benefits			benefits				benefits			benefits			benefits			benefits
	Discount rate		3.30% - 3.57%			3.41%				3.89% - 4.07%			4.00%			4.94% - 5.12.%			5.07%
	Expected long-term rate of return on plan assets		7.5	%		N/A				7.5	%		N/A			8.5	%		N/A
Effects of One Percentage-Point Change in Assumed Health Care Cost Trend Rates	'
	A one percentage-point change in assumed health care cost trend rates would have the following effects as of year-end 2013 and 2012:
		2013							2012
		Increase			Decrease				Increase			Decrease
	Total service cost and interest cost components	$	66		$	(55	)		$	73		$	(63	)
	Estimated APBO		1,251			(1,073	)			1,555			(1,331	)
Fair Value of Company's Pension Plans' Assets	'
	The fair value of the Company’s pension plans’ assets by asset class and fair value hierarchy level as of year-end 2013 and 2012 are as follows:
		2013
		Total fair			Quoted prices in active				Observable
		value			markets for identical				inputs (Level 2)
					assets (Level 1)
	Fixed income securities:
	Intermediate—government	$	1,647		$	—			$	1,647
	Intermediate—corporate		3,138			—				3,138
	Short-term—government		2,168			—				2,168
	Short-term—corporate		4,040			—				4,040
	Equity securities:
	U.S. Large cap value		1,221			1,221				—
	U.S. Large cap growth		1,536			1,536				—
	U.S. Mid cap value		600			600				—
	U.S. Mid cap growth		603			603				—
	U.S. Small cap value		610			610				—
	U.S. Small cap growth		599			599				—
	International		889			889				—
	Cash		1,665			1,665				—
	Precious metals		358			358				—
	Total	$	19,074		$	8,081			$	10,993
		2012
		Total			Quoted prices in active				Observable
		fair			markets for identical				inputs
		value			assets (Level 1)				(Level 2)
	Fixed income securities:
	Intermediate—government	$	1,247		$	—			$	1,247
	Intermediate—corporate		4,402			—				4,402
	Short-term—government		2,038			—				2,038
	Short-term—corporate		3,123			—				3,123
	Equity securities:
	U.S. Large cap value		1,063			1,063				—
	U.S. Large cap growth		1,037			1,037				—
	U.S. Mid cap value		542			542				—
	U.S. Mid cap growth		536			536				—
	U.S. Small cap value		546			546				—
	U.S. Small cap growth		539			539				—
	International		1,134			1,134				—
	Cash		1,656			1,656				—
	Total	$	17,863		$	7,053			$	10,810
Estimated Benefit Payments	'
	The estimated benefit payments for each of the next five years and the five-year period thereafter are as follows:
		Pension			Other
		benefits			benefits
	2014	$	1,694		$	1,269
	2015		1,704			1,109
	2016		1,739			1,130
	2017		1,737			963
	2018		1,774			1,018
	2019 - 2023		8,667			4,512
	Total	$	17,315		$	10,001
Changes in Projected Benefit Obligations Fair Value of Plan Assets and Funded Status of Plan	'
	Obligations and Funded Status—The following information is as of year-end 2013 and 2012 and for the years ended December 28, 2013, December 31, 2012 and December 31, 2011:
		2013							2012
		Pension			Other				Pension			Other
		benefits			benefits				benefits			benefits
	Change in benefit obligations:
	Beginning of period	$	28,674		$	15,810			$	26,514		$	14,467
	Service cost		295			236				276			207
	Interest cost		963			513				1,055			585
	Actuarial (gain) loss		(2,674	)		(1,048	)			2,347			1,597
	Special termination benefits		—			39				—			—
	Benefits paid		(1,614	)		(1,395	)			(1,518	)		(1,046	)
	End of period		25,644			14,155				28,674			15,810
	Change in fair value of plan assets:
	Beginning of period		17,863			—				16,639			—
	Actual return on plan assets		1,512			—				1,205			—
	Employer contributions		1,313			1,395				1,537			1,046
	Benefits paid		(1,614	)		(1,395	)			(1,518	)		(1,046	)
	End of period		19,074			—				17,863			—
	Funded status of plans	$	(6,570	)	$	(14,155	)		$	(10,811	)	$	(15,810	)
	Current liabilities	$	—		$	(1,268	)		$	—		$	(1,055	)
	Noncurrent liabilities		(6,570	)		(12,887	)			(10,811	)		(14,755	)
	Liability recognized	$	(6,570	)	$	(14,155	)		$	(10,811	)	$	(15,810	)
	Amounts recognized in accumulated other comprehensive income:
	Net actuarial loss	$	4,831		$	4,139			$	8,056		$	5,501
	Prior service cost		—			(1,346	)			—			(1,526	)
	Total amount recognized	$	4,831		$	2,793			$	8,056		$	3,975
Schedule of Net Periodic Pension Benefit Cost and Other Comprehensive Income	'
		2013							2012						2011
		Pension			Other				Pension			Other			Pension			Other
		benefits			benefits				benefits			benefits			benefits			benefits
	Amounts recognized in other comprehensive (gain) loss:
	Net actuarial (gain) loss	$	(2,838	)	$	(1,048	)		$	2,444		$	1,597		$	4,066		$	3,390
	Prior service cost		—			180				—			—			—			(1,705	)
	Amortization of prior year service cost		—			—				—			180			—			—
	Amortization of (gain) loss		(387	)		(314	)			(261	)		(312	)		(5	)		(71	)
	Total amount recognized	$	(3,225	)	$	(1,182	)		$	2,183		$	1,465		$	4,061		$	1,614
	Components of net periodic benefit cost:
	Service cost	$	295		$	236			$	276		$	207		$	275		$	227
	Interest cost		963			513				1,055			585			1,161			710
	Amortization of loss		387			314				262			312			5			69
	Expected return on plan assets		(1,348	)		—				(1,301	)		(180	)		(1,400	)		—
	Special termination benefits		—			39				—			—			—			—
	Amortization of Prior Service Credit		—			(180	)			—			—			—			—
	Net periodic benefit cost	$	297		$	922			$	292		$	924		$	41		$	1,006

Accrued_Mining_and_Landfill_Re1

Accrued Mining and Landfill Reclamation (Tables)	12 Months Ended
	Dec. 28, 2013
Asset Retirement Obligation Disclosure [Abstract]	'
Activity for Asset Retirement Obligations	'
	long-lived asset and depreciated over the asset’s remaining useful life. The following table presents the activity for the asset retirement obligations for the years ended December 28, 2013 and December 29, 2012:
		2013			2012
	Beginning balance	$	14,844		$	13,328
	Acquired obligations		286			364
	Change in cost estimate		721			604
	Settlement of reclamation obligations		(1,201	)		(77	)
	Additional liabilities incurred		414			—
	Accretion expense		717			625
	Ending balance	$	15,781		$	14,844

AcquisitionRelated_Liabilities1

Acquisition-Related Liabilities (Tables)	12 Months Ended
	Dec. 28, 2013
Business Combinations [Abstract]	'
Remaining Payments Due under Noncompete and Deferred Consideration Agreements	'
	annual installments. The remaining payments due under these noncompete and deferred consideration agreements are as follows:
	2014	$	10,790
	2015		6,742
	2016		5,950
	2017		5,910
	2018		5,370
	Thereafter		9,963
	Total scheduled payments		44,725
	Present value adjustments		(12,242	)
	Total noncompete obligations and deferred consideration	$	32,483

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 28, 2013
Schedule of Supplemental Cash Flow Information	'
	Supplemental cash flow information for the years ended December 28, 2013, December 29, 2012 and December 31, 2011 is as follows:
		2013		2012			2011
	Cash payments:
	Interest	$	52,001	$	36,357		$	41,790
	Income taxes		457		799			5,608
Continental Cement Company, L.L.C. [Member]	'
Schedule of Supplemental Cash Flow Information	'
	Supplemental cash flow information is as follows for the years ended December 28, 2013, December 31, 2012 and December 31, 2011:
		2013		2012			2011
	Cash paid for interest	$	11,488	$	7,353		$	12,946
	Non cash financing activities:
	Proceeds on borrowings due to Summit Materials	$	—	$	156,842		$	—
	Repayment by Summit Materials of long-term debt and accrued interest		—		(156,842	)		—

Leasing_Arrangements_Tables

Leasing Arrangements (Tables)	12 Months Ended
	Dec. 28, 2013
Minimum Contractual Commitments under Long-Term Operating Leases	'
	$4.5 million, $3.9 million and $3.1 million, respectively. Minimum contractual commitments under long-term operating leases, which primarily relate to land, plant and equipment and under royalty agreements as of December 28, 2013, are as follows:
		Operating		Royalty
		Leases		Agreements
	2014	$	4,034	$	2,044
	2015		3,890		2,065
	2016		3,098		1,974
	2017		2,376		2,047
	2018		1,983		1,434
Continental Cement Company, L.L.C. [Member]	'
Minimum Contractual Commitments under Long-Term Operating Leases	'
	Minimum rental commitments under long-term operating leases as of December 28, 2013, are as follows:
	2014	$	378
	2015		341
	2016		325
	2017		291
	2018		291

Employee_Long_Term_Incentive_P1

Employee Long Term Incentive Plan (Tables)	12 Months Ended
	Dec. 28, 2013
Summary of Information for Class D Unit Interests	'
	The following table summarizes information for the Class D unit interests:
		Time-vesting Interests					Performance-vesting
							Interests
		Number of			Weighted		Number of			Weighted
		units			average grant-		units			average grant-
					date fair value					date fair value
					per unit					per unit
	Beginning balance—December 29, 2012		1,692		$	3,864		4,202		$	3,087
	Granted		584			2,786		759			2,314
	Vested		(772	)		3,896		—			—
	Forfeited		(2	)		3,893		(5	)		3,176
	Cancelled		(61	)		2,208		(79	)		1,388
	Balance—December 28, 2013		1,441					4,877
Capital Units [Member]	'
Weighted Average Assumptions Used to Estimate the Fair Value of Grants	'
	The following table presents the weighted average assumptions used to estimate the fair value of grants in 2013, 2012 and 2011:
		2013			2012		2011
	Class D Units
	Risk-free interest rate		0.50%			1.62%		1.71% - 2.39%
	Dividend yield		None			None		None
	Volatility		58%			47%		42% - 49%
	Expected term		4 years			6 - 8 years		6 - 8 years

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 28, 2013
Segment Reporting [Abstract]	'
Summary of Financial Data for Company's Reportable Business Segments	'
	The following tables display selected financial data for the Company’s reportable business segments for the following fiscal years:
			2013			2012			2011
	Revenue:
	Central region		$	329,621		$	302,113		$	264,008
	West region			426,195			484,922			362,577
	East region			160,385			139,219			162,491
	Total revenue		$	916,201		$	926,254		$	789,076
			2013			2012			2011
	Segment profit (loss):
	Central region		$	72,918		$	65,767		$	65,651
	West region			28,607			14,429			36,442
	East region			15,134			10,782			15,504
	Corporate and other(1)			(24,878	)		(15,560	)		(9,877	)
	Total reportable segments and corporate			91,781			75,418			107,720
	Interest expense			56,443			58,079			47,784
	Depreciation, depletion, amortization and accretion			72,934			68,290			61,377
	Goodwill impairment			68,202			—			—
	Loss from continuing operations before taxes		$	(105,798	)	$	(50,951	)	$	(1,441	)
	-1	Corporate results primarily consist of compensation and office expenses for employees included in the Company’s headquarters and transactions costs.
			2013			2012			2011
	Cash paid for capital expenditures:
	Central region		$	33,030		$	20,996		$	20,078
	West region			21,856			14,993			9,256
	East region			7,753			8,736			9,311
	Total reportable segments			62,639			44,725			38,645
	Corporate and other			3,360			763			11
	Total capital expenditures		$	65,999		$	45,488		$	38,656
			2013			2012			2011
	Depreciation, depletion, amortization and accretion:
	Central region		$	33,808		$	30,215		$	27,646
	West region			24,167			23,771			19,706
	East region			14,493			14,223			13,938
	Total reportable segments			72,468			68,209			61,290
	Corporate and other			466			81			87
	Total depreciation, depletion, amortization and accretion		$	72,934		$	68,290		$	61,377
			2013			2012			2011
	Total assets:
	Central region		$	657,421		$	610,003		$	587,341
	West region			383,544			428,115			451,017
	East region			192,486			224,603			238,018
	Total reportable segments			1,233,451			1,262,721			1,276,376
	Corporate and other			14,343			18,492			7,889
	Total assets		$	1,247,794		$	1,281,213		$	1,284,265
			2013			2012			2011
	Revenue by product:*
	Aggregates		$	159,019		$	146,991		$	116,082
	Cement			76,211			77,676			69,664
	Ready-mixed concrete			112,878			100,941			94,302
	Asphalt			219,811			242,458			182,952
	Construction and paving			478,280			505,189			464,866
	Other			(129,998	)		(147,001	)		(138,790	)
	Total revenue		$	916,201		$	926,254		$	789,076
	*	Revenue by product includes intracompany sales transferred at market value. The elimination of intracompany transactions is included in Other.

Senior_Notes_Guarantor_and_Non1

Senior Notes' Guarantor and Non-Guarantor Financial Information (Tables)	12 Months Ended
	Dec. 28, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Schedule of Condensed Consolidating Balance Sheets	'
	Condensed Consolidating Balance Sheets
	December 28, 2013
		Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
		Materials,			Wholly-			owned			Guarantors
		LLC			owned			Guarantors
		(Parent)			Guarantor
	Assets
	Current assets:
	Cash	$	10,375		$	9		$	3,442		$	3,631		$	(2,540	)	$	14,917
	Accounts receivable, net		—			4,587			93,102			3,100			(1,452	)		99,337
	Intercompany receivables		38,134			3,433			30,787			—			(72,354	)		—
	Cost and estimated earnings in excess of billings		—			—			10,539			228			—			10,767
	Inventories		—			10,402			85,372			658			—			96,432
	Other current assets		750			444			11,715			272			—			13,181
	Total current assets		49,259			18,875			234,957			7,889			(76,346	)		234,634
	Property, plant and equipment, net		3,969			301,908			518,935			6,966			—			831,778
	Goodwill		—			23,124			102,942			972			—			127,038
	Intangible assets, net		—			642			14,505			—			—			15,147
	Other assets		296,494			17,973			37,535			1,303			(314,108	)		39,197
	Total assets	$	349,722		$	362,522		$	908,874		$	17,130		$	(390,454	)	$	1,247,794
	Liabilities, Redeemable Noncontrolling Interest and Member’s Interest
	Current liabilities:
	Current portion of debt	$	26,010		$	1,018		$	3,192		$	—		$	—		$	30,220
	Current portion of acquisition-related liabilities		2,000			—			8,635			—			—			10,635
	Accounts payable		5,455			9,387			57,142			1,572			(1,452	)		72,104
	Accrued expenses		12,041			9,185			37,342			1,223			(2,540	)		57,251
	Intercompany payables		—			—			71,556			798			(72,354	)		—
	Billings in excess of costs and estimated earnings		—			—			8,837			426			—			9,263
	Total current liabilities		45,506			19,590			186,704			4,019			(76,346	)		179,473
	Long-term debt		19,587			154,590			484,590			—			—			658,767
	Acquisition-related liabilities		85			—			23,671			—			—			23,756
	Other noncurrent liabilities		959			20,306			56,215			—			—			77,480
	Total liabilities		66,137			194,486			751,180			4,019			(76,346	)		939,476
	Redeemable noncontrolling interest		—			—			—			—			24,767			24,767
	Redeemable members’ interest		—			23,450			—			—			(23,450	)		—
	Total member’s interest		283,585			144,586			157,694			13,111			(315,425	)		283,551
	Total liabilities, redeemable noncontrolling interest and member’s interest	$	349,722		$	362,522		$	908,874		$	17,130		$	(390,454	)	$	1,247,794
	Condensed Consolidating Balance Sheets
	December 29, 2012
		Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
		Materials,			Wholly-			owned			Guarantors
		LLC			owned			Guarantors
		(Parent)			Guarantor
	Assets
	Current assets:
	Cash	$	697		$	397		$	30,981		$	680		$	(5,324	)	$	27,431
	Accounts receivable, net		—			7,421			90,765			3,255			(1,143	)		100,298
	Intercompany receivables		14,931			15,557			9,018			—			(39,506	)		—
	Cost and estimated earnings in excess of billings		—			—			11,428			147			—			11,575
	Inventories		—			7,073			84,555			1,349			—			92,977
	Other current assets		25			726			8,447			2,409			(1,539	)		10,068
	Total current assets		15,653			31,174			235,194			7,840			(47,512	)		242,349
	Property, plant and equipment, net		1,074			287,677			517,994			6,862			—			813,607
	Goodwill		—			23,124			155,024			972			—			179,120
	Intangible assets, net		—			742			7,864			—			—			8,606
	Other assets		374,581			11,891			161,442			1,315			(511,698	)		37,531
	Total assets	$	391,308		$	354,608		$	1,077,518		$	16,989		$	(559,210	)	$	1,281,213
	Liabilities, Redeemable Noncontrolling Interest and Member’s Interest
	Current liabilities:
	Current portion of debt	$	—		$	965		$	3,035		$	—		$	—		$	4,000
	Current portion of acquisition-related liabilities		—			—			9,525			—			—			9,525
	Accounts payable		2,745			6,715			51,179			2,138			(1,143	)		61,634
	Accrued expenses		6,877			10,742			38,050			1,015			(6,862	)		49,822
Intercompany payables		—			—			33,396			6,110			(39,506	)		—
Billings in excess of costs and estimated earnings		—			—			6,656			270			—			6,926
Total current liabilities		9,622			18,422			141,841			9,533			(47,511	)		131,907
Long-term debt		—			155,394			480,449			—			—			635,843
Acquisition-related liabilities		—			—			23,919			—			—			23,919
Other noncurrent liabilities		395			27,091			56,780			—			—			84,266
Total liabilities		10,017			200,907			702,989			9,533			(47,511	)		875,935
Redeemable noncontrolling interest		—			—			—			—			22,850			22,850
Redeemable members’ interest		—			22,850			—			—			(22,850	)		—
Total member’s interest		381,291			130,851			374,529			7,456			(511,699	)		382,428
Total liabilities, redeemable noncontrolling interest and member’s interest	$	391,308		$	354,608		$	1,077,518		$	16,989		$	(559,210	)	$	1,281,213
Schedule of Condensed Consolidating Statements of Operations and Comprehensive (Loss) Income	'
	Condensed Consolidating Statements of Operations and Comprehensive (Loss) Income
	Year ended December 28, 2013
		Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
		Materials			Wholly-			owned			Guarantors
		LLC			owned			Guarantors
		(Parent)			Guarantor
	Total revenue	$	—		$	80,759		$	807,921		$	41,910		$	(14,389	)	$	916,201
	Cost of revenue (excluding items shown separately below)		—			55,241			611,799			24,401			(14,389	)		677,052
	General and administrative expenses		7,241			7,673			125,778			1,308			—			142,000
	Goodwill impairment		—			—			68,202			—			—			68,202
	Depreciation, depletion, amortization and accretion		465			11,378			60,078			1,013			—			72,934
	Transaction costs		—			—			3,990			—			—			3,990
	Operating (loss) income		(7,706	)		6,467			(61,926	)		15,188			—			(47,977	)
	Other expense (income), net		99,085			(3,737	)		(3,410	)		274			(90,834	)		1,378
	Interest expense		—			10,702			49,591			382			(4,232	)		56,443
	(Loss) income from continuing operations before taxes		(106,791	)		(498	)		(108,107	)		14,532			95,066			(105,798	)
	Income tax expense		—			—			(2,647	)		—			—			(2,647	)
	(Loss) income from continuing operations		(106,791	)		(498	)		(105,460	)		14,532			95,066			(103,151	)
	Loss from discontinued operations		—			—			528			—			—			528
	Net (loss) income		(106,791	)		(498	)		(105,988	)		14,532			95,066			(103,679	)
	Net income attributable to noncontrolling interest		—			—			—			—			3,112			3,112
	Net (loss) income attributable to member of Summit Materials, LLC	$	(106,791	)	$	(498	)	$	(105,988	)	$	14,532		$	91,954		$	(106,791	)
	Comprehensive (loss) income attributable to member of Summit Materials, LLC	$	(106,791	)	$	3,909		$	(105,988	)	$	14,532		$	90,632		$	(103,706	)
	Condensed Consolidating Statements of Operations and Comprehensive (Loss) Income
	Year ended December 29, 2012
		Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
		Materials			Wholly-			owned			Guarantors
		LLC			owned			Guarantors
		(Parent)			Guarantor
	Total revenue	$	—		$	81,516		$	824,796		$	33,074		$	(13,132	)	$	926,254
	Cost of revenue (excluding items shown separately below)		—			58,319			649,577			18,582			(13,132	)		713,346
	General and administrative expenses		8			6,235			119,645			1,327			—			127,215
	Depreciation, depletion, amortization and accretion		81			10,093			57,080			1,036			—			68,290
	Transaction costs		—			—			1,988			—			—			1,988
	Operating (loss) income		(89	)		6,869			(3,494	)		12,129			—			15,415
	Other expense (income), net		52,400			(2,065	)		6,630			(101	)		(48,577	)		8,287
	Interest expense		—			12,045			47,293			633			(1,892	)		58,079
	(Loss) income from continuing operations before taxes		(52,489	)		(3,111	)		(57,417	)		11,597			50,469			(50,951	)
	Income tax expense		5			—			(3,925	)		—			—			(3,920	)
	(Loss) income from continuing operations		(52,494	)		(3,111	)		(53,492	)		11,597			50,469			(47,031	)
	Loss from discontinued operations		—			—			3,546			—			—			3,546
	Net (loss) income		(52,494	)		(3,111	)		(57,038	)		11,597			50,469			(50,577	)
	Net income attributable to noncontrolling interest		—			—			—			—			1,919			1,919
	Net (loss) income attributable to member of Summit Materials, LLC	$	(52,494	)	$	(3,111	)	$	(57,038	)	$	11,597		$	48,550		$	(52,496	)
	Comprehensive (loss) income attributable to member of Summit Materials, LLC	$	(52,494	)	$	(6,759	)	$	(57,038	)	$	11,597		$	49,645		$	(55,049	)
	Condensed Consolidating Statements of Operations and Comprehensive (Loss) Income
	Year ended December 31, 2011
		Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
		Materials			Wholly-			owned			Guarantors
		LLC			owned			Guarantors
		(Parent)			Guarantor
	Total revenue	$	—		$	70,064		$	700,916		$	21,566		$	(3,470	)	$	789,076
	Cost of revenue (excluding items shown separately below)		—			41,221			542,699			17,204			(3,470	)		597,654
	General and administrative expenses		1,453			3,933			89,011			1,429			—			95,826
	Depreciation, depletion, amortization and accretion		87			9,697			50,640			953			—			61,377
	Transaction costs		—			—			9,120			—			—			9,120
	Operating (loss) income		(1,540	)		15,213			9,446			1,980			—			25,099
	Other expense (income), net		8,510			(61	)		(24,375	)		124			(5,442	)		(21,244	)
	Interest expense		—			14,004			33,685			647			(552	)		47,784
	(Loss) income from continuing operations before taxes		(10,050	)		1,270			136			1,209			5,994			(1,441	)
	Income tax expense		—			—			3,408			—			—			3,408
	(Loss) income from continuing operations		(10,050	)		1,270			(3,272	)		1,209			5,994			(4,849	)
	Loss from discontinued operations		—			—			5,201			—			—			5,201
Net (loss) income		(10,050	)		1,270			(8,473	)		1,209			5,994			(10,050	)
Net income attributable to noncontrolling interest		695			—			695			—			(695	)		695
Net (loss) income attributable to member of Summit Materials, LLC	$	(10,745	)	$	1,270		$	(9,168	)	$	1,209		$	6,689		$	(10,745	)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	$	(9,375	)	$	(4,405	)	$	(13,473	)	$	1,209		$	10,994		$	(15,050	)
Schedule of Condensed Consolidating Statements of Cash Flows	'
	Condensed Consolidating Statements of Cash Flows
	Year ended December 28, 2013
		Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
		Materials,			Wholly-			owned			Guarantors
		LLC			owned			Guarantors
		(Parent)			Guarantor
	Net cash (used for) provided by operating activities	$	(232	)	$	9,003		$	44,746		$	12,895		$	—		$	66,412
	Cash flow from investing activities:
	Acquisitions, net of cash acquired		—			—			(61,601	)		—			—			(61,601	)
	Purchase of property, plant and equipment		(3,359	)		(24,896	)		(36,629	)		(1,115	)		—			(65,999	)
	Proceeds from the sale of property, plant, and equipment		—			3			16,020			62			—			16,085
	Net cash used for investing activities		(3,359	)		(24,893	)		(82,210	)		(1,053	)		—			(111,515	)
	Cash flow from financing activities
	Net proceeds from debt issuance		230,817			—			—			—			—			230,817
	Loans received from and payments made on loans from other Summit Companies		(29,121	)		15,502			19,726			(8,891	)		2,784			—
	Payments on long-term debt		(188,424	)		—			—			—			—			(188,424	)
	Payments on acquisition-related liabilities		—			—			(9,801	)		—			—			(9,801	)
	Other		(3	)		—			—			—			—			(3	)
	Net cash provided by (used for) financing activities		13,269			15,502			9,925			(8,891	)		2,784			32,589
	Net decrease (increase) in cash		9,678			(388	)		(27,539	)		2,951			2,784			(12,514	)
	Cash—Beginning of period		697			397			30,981			680			(5,324	)		27,431
	Cash—End of period	$	10,375		$	9		$	3,442		$	3,631		$	(2,540	)	$	14,917
	Condensed Consolidating Statements of Cash Flows
	Year ended December 29, 2012
		Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
		Materials,			Wholly-			owned			Guarantors
		LLC			owned			Guarantors
		(Parent)			Guarantor
	Net cash provided by operating activities	$	4,845		$	12,806		$	36,649		$	8,217		$	(238	)	$	62,279
	Cash flow from investing activities:
	Acquisitions, net of cash acquired		—			—			(48,757	)		—			—			(48,757	)
	Purchase of property, plant and equipment		(762	)		(12,174	)		(31,818	)		(734	)		—			(45,488	)
	Proceeds from the sale of property, plant, and equipment		—			69			8,577			190			—			8,836
	Other		—			—			69			—			—			69
	Net cash used for investing activities		(762	)		(12,105	)		(71,929	)		(544	)		—			(85,340	)
	Cash flow from financing activities
	Net proceeds from debt issuance		713,378			(17	)		—			—			—			713,361
	Loans received from and payments made on loans from other Summit Companies		(25,371	)		(295	)		39,783			(8,793	)		(5,324	)		—
	Payments on long-term debt		(697,438	)		—			—			—			—			(697,438	)
	Payments on acquisition-related liabilities		—			—			(7,519	)		—			—			(7,519	)
	Other		(656	)		—			—			(284	)		238			(702	)
	Net cash (used for) provided by financing activities		(10,087	)		(312	)		32,264			(9,077	)		(5,086	)		7,702
	Net decrease (increase) in cash		(6,004	)		389			(3,016	)		(1,404	)		(5,324	)		(15,359	)
	Cash—Beginning of period		6,701			8			33,997			2,084			—			42,790
	Cash—End of period	$	697		$	397		$	30,981		$	680		$	(5,324	)	$	27,431
	Condensed Consolidating Statements of Cash Flows
	Year ended December 31, 2011
		Summit			Non-			Wholly-			Non-			Eliminations			Consolidated
		Materials,			Wholly-			owned			Guarantors
		LLC			owned			Guarantors
		(Parent)			Guarantor
	Net cash provided by operating activities	$	(824	)	$	3,808		$	17,262		$	2,586		$	421		$	23,253
	Cash flow from investing activities:
	Acquisitions, net of cash acquired		—			—			(161,073	)		—			—			(161,073	)
	Purchase of property, plant and equipment		(11	)		(5,933	)		(31,210	)		(1,502	)		—			(38,656	)
	Proceeds from the sale of property, plant, and equipment		—			168			6,880			109			—			7,157
	Proceeds from the sale of investments		—			—			377			(136	)		—			241
	Cash contribution to affiliates		(135,530	)		—			—			—			135,530			—
	Net cash used for investing activities		(135,541	)		(5,765	)		(185,026	)		(1,529	)		135,530			(192,331	)
	Cash flow from financing activities
	Proceeds from investment by member		103,630			—			135,530			421			(135,951	)		103,630
	Net proceeds from debt issuance		—			36,456			60,292			—			—			96,748
	Payments on long-term debt		—			(34,500	)		(14,500	)		—			—			(49,000	)
Payments on acquisition-related liabilities		—			—			(4,593	)		—			—			(4,593	)
Other		—			—			—			(10	)		—			(10	)
Net cash (used for) provided by financing activities		103,630			1,956			176,729			411			(135,951	)		146,775
Net decrease (increase) in cash		(32,735	)		(1	)		8,965			1,468			—			(22,303	)
Cash—Beginning of period		39,436			9			25,032			616			—			65,093
Cash—End of period	$	6,701		$	8		$	33,997		$	2,084		$	—		$	42,790

Supplementary_Data_Unaudited_T

Supplementary Data (Unaudited) (Tables)	12 Months Ended
	Dec. 28, 2013
Supplemental Financial Information	'
	Supplemental financial information (unaudited) by quarter is as follows for the years ended 2013 and 2012:
		2013											2012
		4Q			3Q		2Q			1Q			4Q			3Q		2Q			1Q
	Revenue	$	238,267		$	316,263	$	254,842		$	106,829		$	231,634		$	319,181	$	255,556		$	119,883
	Operating (loss) income		(57,742	)		37,895		13,731			(41,861	)		13,322			33,249		9,015			(40,171	)
	(Loss) income from continuing operations		(70,191	)		22,950		244			(56,154	)		433			19,656		(5,621	)		(61,499	)
	Loss (income) from discontinued operations		271			160		(26	)		123			535			1,287		2,221			(497	)
	Net (loss) income	$	(70,462	)	$	22,790	$	270		$	(56,277	)	$	(102	)	$	18,369	$	(7,842	)	$	(61,002	)
Continental Cement Company, L.L.C. [Member]	'
Supplemental Financial Information	'
	Supplemental financial information (unaudited) by quarter is as follows for the years ended December 28, 2013 and December 31, 2012:
		2013											2012
	(in thousands)	4Q			3Q		2Q			1Q			4Q			3Q		2Q			1Q
	Revenues	$	22,509		$	34,155	$	27,224		$	12,361		$	25,304		$	30,430	$	26,141		$	13,007
	Operating income (loss)		9,259			10,965		9,053			(8,449	)		7,625			7,124		9,097			(4,468	)
	Net income (loss)	$	6,668		$	8,157	$	6,272		$	(11,232	)	$	4,694		$	3,977	$	5,999		$	(8,045	)

Accrued_Expenses_Tables

Accrued Expenses (Tables) (Continental Cement Company, L.L.C. [Member])	12 Months Ended
	Dec. 28, 2013
Continental Cement Company, L.L.C. [Member]	'
Accrued Expenses	'
	Accrued expenses consist of the following as of year-end 2013 and 2012:
		2013		2012
	Accrued interest due to Summit Materials	$	3,848	$	4,283
	Accrued interest due to non-controlling interest		723		2,149
	Accrued post-retirement benefits other than pensions, current portion		1,268		1,055
	Accrued professional fees		340		400
	Accrued payroll, insurance and benefits		758		897
	Accrued bonus liability		884		1,153
	Accrued costs to remove barge from waterway		880		850
	Other		1,296		736
	Total	$	9,997	$	11,523

Summary_of_Organization_and_Si3

Summary of Organization and Significant Accounting Policies - Additional Information (Detail) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 28, 2013

Dec. 28, 2013

Segment

Customer

Customer

Senior Secured Credit Facility, Revolver [Member]

Level 3 [Member]

Level 3 [Member]

Observable Inputs (Level 2) [Member]

Observable Inputs (Level 2) [Member]

Sales [Member]

Sales [Member]

Sales [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Ohio Valley Asphalt, LLC [Member]

Minimum [Member]

Maximum [Member]

Customer

Reporting_Unit

Sales [Member]

Sales [Member]

Sales [Member]

State

Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of operating states

14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of owned subsidiary

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of operating segment

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redeemable noncontrolling interest percentage

'

'

'

'

'

'

'

'

'

'

'

30.00%

'

'

'

'

20.00%

'

'

Ownership investment percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

20.00%

50.00%

Customer accounted revenue

'

'

'

'

'

'

'

'

10.00%

10.00%

10.00%

'

'

16.00%

13.00%

14.00%

'

'

'

Number of customers accounted for more than 10% of total revenue

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net loss from asset dispositions

($12,419,000)

($2,564,000)

($2,349,000)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Impairment charges

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Inflation rate

2.50%

'

'

'

'

'

'

'

'

'

'

2.50%

'

'

'

'

'

'

'

Amortization expense

800,000

600,000

500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount rate

8.40%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reductions recognized in contingent consideration

'

400,000

10,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of deferred consideration

'

'

'

'

28,300,000

4,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of noncompete obligations

'

'

'

'

23,400,000

7,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of long-term debt

'

'

'

'

'

'

696,500,000

670,700,000

'

'

'

'

'

'

'

'

'

'

'

Carrying value of long-term debt

662,987,000

'

'

'

'

'

663,000,000

639,800,000

'

'

'

'

'

'

'

'

'

'

'

Revolving credit facility, fair value

'

'

'

26,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Value of goodwill

127,038,000

179,120,000

153,375,000

'

'

'

'

'

'

'

'

24,096,000

24,096,000

'

'

'

'

'

'

Number of reporting unit for annual impairment analysis

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

Goodwill impairment charges

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

Impairment

$68,202,000

'

'

'

'

'

'

'

'

'

'

$0

$0

'

'

'

'

'

'

Summary_of_Organization_and_Si4

Summary of Organization and Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 28, 2013
Minimum [Member] | Buildings and Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'7 years
Minimum [Member] | Buildings and Improvements [Member] | Continental Cement Company, L.L.C. [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'30 years
Minimum [Member] | Plants, Machinery and Equipment [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'3 years
Minimum [Member] | Plants, Machinery and Equipment [Member] | Continental Cement Company, L.L.C. [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'3 years
Minimum [Member] | Truck and Auto Fleet [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'3 years
Minimum [Member] | Mobile Equipment and Barges [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'3 years
Minimum [Member] | Mobile Equipment and Barges [Member] | Continental Cement Company, L.L.C. [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'3 years
Minimum [Member] | Landfill Airspace and Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'5 years
Minimum [Member] | Other [Member] | Continental Cement Company, L.L.C. [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'3 years
Maximum [Member] | Buildings and Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'40 years
Maximum [Member] | Buildings and Improvements [Member] | Continental Cement Company, L.L.C. [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'40 years
Maximum [Member] | Plants, Machinery and Equipment [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'40 years
Maximum [Member] | Plants, Machinery and Equipment [Member] | Continental Cement Company, L.L.C. [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'40 years
Maximum [Member] | Truck and Auto Fleet [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'10 years
Maximum [Member] | Mobile Equipment and Barges [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'20 years
Maximum [Member] | Mobile Equipment and Barges [Member] | Continental Cement Company, L.L.C. [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'20 years
Maximum [Member] | Landfill Airspace and Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'60 years
Maximum [Member] | Other [Member] | Continental Cement Company, L.L.C. [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life	'7 years

Summary_of_Organization_and_Si5

Summary of Organization and Significant Accounting policies - Intangible Assets by Type and in Total (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	$17,340	$9,960
Accumulated Amortization	-2,193	-1,354
Net Carrying Amount	15,147	8,606
Leases [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	10,430	8,940
Accumulated Amortization	-1,604	-1,092
Net Carrying Amount	8,826	7,848
Reserve Rights [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	5,890	'
Accumulated Amortization	-221	'
Net Carrying Amount	5,669	'
Trade Names [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	1,020	1,020
Accumulated Amortization	-368	-262
Net Carrying Amount	$652	$758

Summary_of_Organization_and_Si6

Summary of Organization and Significant Accounting Policies - Estimated Amortization Expense for Intangible Assets (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Accounting Policies [Abstract]	'	'
2014	$897	'
2015	897	'
2016	897	'
2017	893	'
2018	893	'
Thereafter	10,670	'
Total	$15,147	$8,606

Summary_of_Organization_and_Si7

Summary of Organization and Significant Accounting Policies - Assets and Liabilities Measured at Fair Value (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Accounting Policies [Abstract]	'	'
Current portion of contingent consideration	'	$746
Contingent consideration	$1,908	$1,908

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail)	12 Months Ended
	Dec. 28, 2013
2013 Acquisitions [Member] | Central Region [Member]	'
Business Acquisition [Line Items]	'
Business acquisition date	1-Apr-13
2013 Acquisitions [Member] | West Region [Member]	'
Business Acquisition [Line Items]	'
Business acquisition date	1-Apr-13
2012 Acquisitions [Member] | Central Region [Member]	'
Business Acquisition [Line Items]	'
Business acquisition date	29-Feb-12
2012 Acquisitions [Member] | West Region [Member]	'
Business Acquisition [Line Items]	'
Business acquisition date	30-Nov-12
2012 Acquisitions [Member] | East Region [Member]	'
Business Acquisition [Line Items]	'
Business acquisition date	5-Oct-12

Acquisitions_Supplemental_Pro_

Acquisitions - Supplemental Pro Forma Information of Acquisitions (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Business Combinations [Abstract]	'	'
Revenue	$916,201	$976,797
Net loss	($103,679)	($45,976)

Acquisitions_Summary_of_Fair_V

Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified				Series of Individually Immaterial Business Acquisitions [Member]	Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]	'	'	'	'	'
Financial assets	'	'	'	$8,302	$1,397
Inventories	'	'	'	3,954	6,988
Property, plant and equipment	'	'	'	40,580	21,543
Other assets	'	'	'	52	1,330
Intangible assets	'	'	'	7,428	3,172
Financial liabilities	'	'	'	-6,164	-944
Other long-term liabilities	'	'	'	-1,050	-364
Net assets acquired	'	'	'	53,102	33,122
Goodwill	127,038	179,120	153,375	16,120	26,230
Total purchase price	'	'	'	69,222	59,352
Noncash transactions:	'	'	'	'	'
Acquisition related liabilities	'	'	'	-7,902	-10,547
Other	'	'	'	281	-48
Total noncash transactions	'	'	'	-7,621	-10,595
Net cash paid for acquisitions	'	'	'	$61,601	$48,757

Acquisitions_Summary_of_Fair_V1

Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
		Reserve Rights [Member]	Leases [Member]
Business Acquisition [Line Items]	'	'	'
Acquired intangible assets weighted average life	'18 years	'20 years	'11 years
Aggregate reserves	$5.90	'	'

Goodwill_Additional_Informatio

Goodwill - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
	Unit
Goodwill [Line Items]	'	'	'
Total number of reporting units	8	'	'
Weightage for DCF valuation and market assessment to estimate fair value of operating unit	50.00%	'	'
Discount rate	8.40%	'	'
Goodwill impairment	$68,202,000	'	'
Impairment charges recognized	$0	$0	$0
Goodwill [Member]	'	'	'
Goodwill [Line Items]	'	'	'
Discount rate	11.00%	'	'

Goodwill_Components_of_Goodwil

Goodwill - Components of Goodwill, by Reportable Segment (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Goodwill [Line Items]	'	'
Beginning Balance	$179,120	$153,375
Acquisitions	16,120	25,745
Goodwill impairment	-68,202	'
Ending Balance	127,038	179,120
Central Region [Member]	'	'
Goodwill [Line Items]	'	'
Beginning Balance	72,789	53,585
Acquisitions	'	19,204
Goodwill impairment	'	'
Ending Balance	72,789	72,789
West Region [Member]	'	'
Goodwill [Line Items]	'	'
Beginning Balance	91,393	91,598
Acquisitions	16,120	-205
Goodwill impairment	-53,264	'
Ending Balance	54,249	91,393
East Region [Member]	'	'
Goodwill [Line Items]	'	'
Beginning Balance	14,938	8,192
Acquisitions	'	6,746
Goodwill impairment	-14,938	'
Ending Balance	'	$14,938

Discontinued_Operations_Additi

Discontinued Operations - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 29, 2012
Discontinued Operations And Disposal Groups [Abstract]	'
Sale of railroad construction, repair business and environmental business	$3.10

Discontinued_Operations_Revenu

Discontinued Operations - Revenue and Loss before Income Tax Expense from Discontinued Operations (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Discontinued Operations And Disposal Groups [Abstract]	'	'	'
Total revenue	$3,884	$50,152	$49,537
Loss from discontinued operations before income tax expense	$528	$3,546	$5,201

Accounts_Receivable_Net_Summar

Accounts Receivable, Net - Summary of Accounts Receivable, Net (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012	Dec. 28, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified			Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Trade accounts receivable	$85,188	$88,637	'	'
Trade accounts receivable from unaffiliated entities	'	'	6,961	8,859
Retention receivables	15,966	13,181	'	'
Trade accounts receivable from related parties	'	'	422	1,193
Receivables from related parties	202	1,871	'	'
Accounts receivable	101,356	103,689	7,383	10,052
Less: Allowance for doubtful accounts	-2,019	-3,391	-30	-128
Accounts receivable, net	$99,337	$100,298	$7,353	$9,924

Inventories_Components_of_Inve

Inventories - Components of Inventories (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012	Dec. 28, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified			Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Inventory [Line Items]	'	'	'	'
Aggregate stockpiles	$70,300	$62,872	'	'
Finished goods	11,207	9,342	6,807	4,350
Work in process	2,623	2,679	2,623	2,248
Raw materials	12,302	18,084	972	475
Total	$96,432	$92,977	$10,402	$7,073

Recovered_Sheet1

Property, Plant and Equipment, Net - Components of Property, Plant and Equipment (Detail) (USD $)

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 31, 2012

In Thousands, unless otherwise specified

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Land (Mineral Bearing) and Asset Retirement Costs [Member]

Land (Mineral Bearing) and Asset Retirement Costs [Member]

Land (Mineral Bearing) and Asset Retirement Costs [Member]

Land (Mineral Bearing) and Asset Retirement Costs [Member]

Land (Non-Mineral Bearing) [Member]

Land (Non-Mineral Bearing) [Member]

Land (Non-Mineral Bearing) [Member]

Land (Non-Mineral Bearing) [Member]

Buildings and Improvements [Member]

Buildings and Improvements [Member]

Buildings and Improvements [Member]

Buildings and Improvements [Member]

Plants, Machinery and Equipment [Member]

Plants, Machinery and Equipment [Member]

Plants, Machinery and Equipment [Member]

Plants, Machinery and Equipment [Member]

Truck and Auto Fleet [Member]

Truck and Auto Fleet [Member]

Landfill Airspace and Improvements [Member]

Landfill Airspace and Improvements [Member]

Construction in Progress [Member]

Construction in Progress [Member]

Construction in Progress [Member]

Construction in Progress [Member]

Other [Member]

Other [Member]

Other [Member]

Other [Member]

Mobile Equipment and Barges [Member]

Mobile Equipment and Barges [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Property, Plant and Equipment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, plant and equipment, gross

$1,044,160

$969,920

$342,904

$316,722

$107,007

$106,135

$16,524

$15,449

$81,331

$69,560

$4,605

$4,605

$77,535

$78,168

$40,795

$40,681

$680,942

$623,949

$247,681

$231,454

$19,165

$19,399

$46,841

$46,841

$29,560

$20,734

$23,394

$15,301

$1,779

$5,134

$1,845

$1,373

$8,060

$7,859

Less accumulated depreciation, depletion and amortization

-212,382

-156,313

-36,700

-25,056

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, plant and equipment, net

$831,778

$813,607

$306,204

$291,666

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Recovered_Sheet2

Property, Plant and Equipment, Net - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 29, 2012
				Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Capital Leases for Equipment and Building [Member]	Capital Leases for Equipment and Building [Member]
Property, Plant and Equipment [Line Items]	'	'	'	'	'	'	'	'
Depreciation, depletion and amortization expense	$71,400,000	$68,600,000	$61,800,000	$11,600,000	$10,300,000	$9,800,000	'	'
Property, plant and equipment, net	831,778,000	813,607,000	'	306,204,000	291,666,000	'	11,300,000	3,100,000
Less accumulated depreciation, depletion and amortization	212,382,000	156,313,000	'	36,700,000	25,056,000	'	1,300,000	200,000
Capital leases, accrued expenses obligations	'	'	'	'	'	'	2,100,000	'
Future minimum rental commitments year one	2,100,000	'	'	'	'	'	'	'
Future minimum rental commitments year two	1,100,000	'	'	'	'	'	'	'
Future minimum rental commitments year three	2,900,000	'	'	'	'	'	'	'
Future minimum rental commitments year four	400,000	'	'	'	'	'	'	'
Future minimum rental commitments year five	400,000	'	'	'	'	'	'	'
Underground mine development costs	'	'	'	$22,900,000	$6,600,000	'	'	'

Debt_Schedule_of_Debt_Detail

Debt - Schedule of Debt (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Senior secured credit facility, revolver	$26,000	'
Long-term debt:	'	'
Long-term debt, total	662,987	'
Total	662,987	639,843
Current portion of long-term debt	4,220	4,000
Long-term debt	658,767	635,843
Senior Secured Credit Facility [Member]	'	'
Long-term debt:	'	'
Long-term debt, total	417,016	394,540
Senior Notes [Member]	'	'
Long-term debt:	'	'
Long-term debt, total	$245,971	$245,303

Debt_Schedule_of_Debt_Parenthe

Debt - Schedule of Debt (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Jan. 31, 2012
Senior Notes [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Long-term debt, face value	$250	$250	$250
Original issuance discount	4	4.7	'
Senior Secured Credit Facility [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Long-term debt, face value	419.9	419.9	'
Original issuance discount	2.9	3.5	'
Senior Secured Credit Facility, Revolver [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Revolving senior secured credit facility due date	'2017	'2017	'
Long-term debt, face value	'	'	$150

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Jan. 31, 2012
Debt Instrument [Line Items]	'	'	'
Accrued interest on long term debt	$17,100,000	$19,700,000	'
Original issuance discount	6,903,000	'	9,500,000
Outstanding letters of credit	26,000,000	'	'
Percentage of owned subsidiary	100.00%	'	'
Deferred financing fees, net	11,500,000	12,600,000	'
Senior Secured Credit Facility, Revolver [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Debt instrument, face amount	'	'	150,000,000
Effective interest rate	4.40%	'	'
Maturity date of debt instrument	30-Jan-17	'	'
Outstanding letters of credit	26,000,000	'	'
Senior Secured Credit Facility, Revolver [Member] | Federal Funds Rate [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Basis spread on variable rate	0.50%	'	'
Senior Secured Credit Facility, Revolver [Member] | LIBOR [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Basis spread on variable rate	3.50%	'	'
Senior Secured Credit Facility, Revolver [Member] | Base Rate [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Basis spread on variable rate	2.50%	'	'
Senior Secured Credit Facility, Revolver [Member] | LIBOR Rate Plus [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Basis spread on variable rate	1.00%	'	'
Letter of Credit [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Outstanding letters of credit	18,300,000	'	'
Remaining borrowing capacity	105,700,000	'	'
Senior Secured Credit Facility [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Debt instrument, face amount	419,900,000	419,900,000	'
Maturity date	30-Jan-19	'	'
Maximum borrowing capacity on credit facility	422,000,000	'	'
Quarterly principal repayments percentage	0.25%	'	'
Frequency of periodic payment	'Term debt due on the last business day of each March, June, September and December.	'	'
Additional borrowing	25,000,000	'	'
Change in interest rate	-1.00%	'	'
Write-off of costs from extinguishment of debt	3,100,000	'	'
Credit facility revolving commitments	150,000,000	'	'
Term Loan Credit Facility [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Maximum borrowing capacity on credit facility	'	'	422,000,000
Senior Notes [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Debt instrument, face amount	250,000,000	250,000,000	250,000,000
Interest rate	'	'	10.50%
Maturity date	31-Jan-20	'	'
Debt instrument financing fees	'	9,500,000	'
Commencement of interest payments	31-Jul-12	'	'
Uncommitted Incremental Facility [Member] | Senior Secured Credit Facility [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Line of credit facility additional borrowing capacity	$135,000,000	'	'
Effective interest rate	5.00%	'	'
Uncommitted Incremental Facility [Member] | Senior Secured Credit Facility [Member] | Federal Funds Rate [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Basis spread on variable rate	0.50%	'	'
Uncommitted Incremental Facility [Member] | Senior Secured Credit Facility [Member] | LIBOR [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Basis spread on variable rate	1.00%	'	'
Uncommitted Incremental Facility [Member] | Senior Secured Credit Facility [Member] | Base Rate [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Line of credit facility minimum interest rate	2.25%	'	'
Interest rate - Revolving credit commitments, minimum interest rate	2.75%	'	'
Uncommitted Incremental Facility [Member] | Senior Secured Credit Facility [Member] | LIBOR Rate Plus [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Basis spread on variable rate	3.75%	'	'
Line of credit facility minimum interest rate	1.25%	'	'
First Lien Net Leverage Ratio - April 1, 2012 through June 30, 2014 [Member] | Senior Secured Credit Facility [Member] | Maximum [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
First lien leverage ratio	4.75	'	'
First Lien Net Leverage Ratio - July 1, 2014 to June 30, 2015 [Member] | Senior Secured Credit Facility [Member] | Maximum [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
First lien leverage ratio	4.5	'	'
First Lien Net Leverage Ratio - Thereafter [Member] | Senior Secured Credit Facility [Member] | Maximum [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
First lien leverage ratio	4.25	'	'
Interest Coverage Ratio - January 1, 2013 to December 31, 2014 [Member] | Senior Secured Credit Facility [Member] | Minimum [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Interest coverage ratio, maximum	1.7	'	'
Interest Coverage Ratio - Thereafter [Member] | Senior Secured Credit Facility [Member] | Minimum [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Interest coverage ratio, maximum	1.85	'	'

Debt_Schedule_of_Contractual_P

Debt - Schedule of Contractual Payments Long-Term Debt (Detail) (USD $)	Dec. 28, 2013	Jan. 31, 2012	Dec. 28, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified			Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Long Term Debt Maturities Repayments Of Principal [Line Items]	'	'	'	'
2014	$4,220	'	$1,018	'
2015	4,220	'	1,018	'
2016	5,275	'	1,273	'
2017	4,220	'	1,018	'
2018	3,165	'	764	'
Thereafter	648,790	'	150,517	'
Total	669,890	'	155,608	156,400
Less: Original issue discount	-6,903	-9,500	'	'
Total debt	$662,987	'	'	'

Members_Interest_Additional_in

Member's Interest - Additional information (Detail)	12 Months Ended
	Dec. 28, 2013	Dec. 31, 2012
	Directors	Directors
Limited Partners' Capital Account [Line Items]	'	'
Number of directors	6	'
Continental Cement Company, L.L.C. [Member]	'	'
Limited Partners' Capital Account [Line Items]	'	'
Number of directors	7	'
Directors to be appointed	4	4
Directors to be appointed by noncontrolling interest members	3	3
Anticipated redemption date	'2016-05	'
Class A Units [Member] | Continental Cement Company, L.L.C. [Member]	'	'
Limited Partners' Capital Account [Line Items]	'	'
Member's equity, issued	100	100
Member's equity, outstanding	100	100
Economic interest percentage of classes of capital units	70.00%	'
Interest on capital contributions	11.00%	'
Class B Units [Member] | Continental Cement Company, L.L.C. [Member]	'	'
Limited Partners' Capital Account [Line Items]	'	'
Member's equity, issued	100,000,000	100,000,000
Member's equity, outstanding	100,000,000	100,000,000
Economic interest percentage of classes of capital units	30.00%	'

Income_Taxes_Components_of_Inc

Income Taxes - Components of Income Tax (Benefit) Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Provision for income taxes:	'	'	'
Current	$1,761	($452)	$5,382
Deferred	-4,408	-3,468	-1,974
Income tax (benefit) expense	($2,647)	($3,920)	$3,408

Income_Taxes_Schedule_of_Incom

Income Taxes - Schedule of Income Tax Provision (Benefit) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Income tax benefit at federal statutory tax rate	($37,160)	($19,074)	($6,895)
Book loss not subject to income tax	32,801	16,167	13,790
State and local income taxes	130	-90	666
Depletion expense	-411	-377	-372
Domestic production activities deduction	'	'	-273
Goodwill impairment	1,046	'	'
Bargain purchase gain	'	'	-4,250
Effective rate change	'	-532	627
Valuation allowance	729	36	-360
Other	218	-50	475
Income tax (benefit) expense	($2,647)	($3,920)	$3,408

Income_Taxes_Components_of_Net

Income Taxes - Components of Net Deferred Income Tax Liability (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Deferred tax assets (liabilities):	'	'
Mining reclamation reserve	$1,502	$1,449
Accelerated depreciation	-33,146	-34,733
Net operating loss	2,227	2,134
Capital losses on securities	997	989
Landfill closure reserve	-63	-30
Working capital (e.g., accrued compensation, prepaid assets)	2,399	3,101
Deferred tax liabilities, net	-26,084	-27,090
Less valuation allowance on loss carryforwards	-1,826	-1,025
Total	-27,910	-28,115
Other current assets	2,316	2,275
Other noncurrent liability	-30,226	-30,390
Total	($27,910)	($28,115)

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Income Taxes [Line Items]	'	'	'
Capital loss, carried back	'	'	$800,000
Capital loss, tax benefit recovery	'	'	300,000
Capital loss, not expected to be utilized prior to expiration	'	'	1,000,000
Net operating loss carryforwards for federal income tax purposes	5,200,000	'	'
Net operating loss carryforwards for state income tax purposes	700,000	'	'
Income tax expense or benefit recognized in other comprehensive loss	0	0	0
Uncertain tax positions	$0	'	'
Federal and State Jurisdiction [Member]	'	'	'
Income Taxes [Line Items]	'	'	'
Operating loss carryforwards, expiry year	'2033	'	'
Minimum [Member]	'	'	'
Income Taxes [Line Items]	'	'	'
Tax years open subject to audit	'2010	'	'
Maximum [Member]	'	'	'
Income Taxes [Line Items]	'	'	'
Tax years open subject to audit	'2013	'	'

Employee_Benefit_Plans_Additio

Employee Benefit Plans - Additional Information (Detail) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 28, 2013

Dec. 28, 2013

Dec. 28, 2013

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 28, 2013

Dec. 28, 2013

Dec. 28, 2013

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 28, 2013

Dec. 28, 2013

Dec. 28, 2013

Pension_Plan

Level 3 [Member]

Level 3 [Member]

Equity Securities [Member]

Fixed Income Securities [Member]

Cash [Member]

Precious Metals [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Pension_Plan

Level 3 [Member]

Level 3 [Member]

Equity Securities [Member]

Fixed Income Securities [Member]

Cash [Member]

Precious Metals [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Defined Benefit Plan Disclosure [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expense for defined contribution plans

$2,300,000

$2,200,000

$1,900,000

'

'

'

'

'

'

$500,000

$400,000

$300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of noncontributory defined benefit pension plans

2

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Effective date of plan amended to eliminate

1-Jan-14

'

'

'

'

'

'

'

'

1-Jan-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Actuarial loss expected to be amortized from AOCI

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100,000

100,000

200,000

200,000

Assumed health care cost trend rates

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.00%

7.00%

7.00%

7.00%

9.00%

9.00%

9.00%

9.00%

'

'

'

'

Target allocation

'

'

'

'

'

30.00%

63.00%

5.00%

2.00%

'

'

'

'

'

30.00%

63.00%

5.00%

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

Defined benefit plan fair value of investments

'

'

'

0

0

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected contribution to plans

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,000,000

$1,000,000

$1,300,000

$1,300,000

Employee_Benefit_Plans_Obligat

Employee Benefit Plans - Obligations and Funded Status (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 31, 2012	Dec. 31, 2011
	Pension Benefits [Member]	Pension Benefits [Member]	Pension Benefits [Member]	Pension Benefits [Member]	Pension Benefits [Member]	Pension Benefits [Member]	Other Benefits [Member]	Other Benefits [Member]	Other Benefits [Member]	Other Benefits [Member]	Other Benefits [Member]	Other Benefits [Member]
				Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]				Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Change in benefit obligations:	'	'	'	'	'	'	'	'	'	'	'	'
Beginning of period	$28,674	$26,514	'	$28,674	$26,514	'	$15,810	$14,467	'	$15,810	$14,467	'
Service cost	295	276	275	295	276	275	236	207	227	236	207	227
Interest cost	963	1,055	1,161	963	1,055	1,161	513	585	710	513	585	710
Actuarial (gain) loss	-2,674	2,347	'	-2,674	2,347	'	-1,048	1,597	'	-1,048	1,597	'
Special termination benefits	'	'	'	'	'	'	39	'	'	39	'	'
Benefits paid	-1,614	-1,518	'	-1,614	-1,518	'	-1,395	-1,046	'	-1,395	-1,046	'
End of period	25,644	28,674	26,514	25,644	28,674	26,514	14,155	15,810	14,467	14,155	15,810	14,467
Change in fair value of plan assets:	'	'	'	'	'	'	'	'	'	'	'	'
Beginning of period	17,863	16,639	'	17,863	16,639	'	'	'	'	'	'	'
Actual return on plan assets	1,512	1,205	'	1,512	1,205	'	'	'	'	'	'	'
Employer contributions	1,313	1,537	'	1,313	1,537	'	1,395	1,046	'	1,395	1,046	'
Benefits paid	-1,614	-1,518	'	-1,614	-1,518	'	-1,395	-1,046	'	-1,395	-1,046	'
End of period	19,074	17,863	16,639	19,074	17,863	16,639	'	'	'	'	'	'
Funded status of plans	-6,570	-10,811	'	-6,570	-10,811	'	-14,155	-15,810	'	-14,155	-15,810	'
Current liabilities	'	'	'	'	'	'	-1,268	-1,055	'	-1,268	-1,055	'
Noncurrent liabilities	-6,570	-10,811	'	-6,570	-10,811	'	-12,887	-14,755	'	-12,887	-14,755	'
Liability recognized	-6,570	-10,811	'	-6,570	-10,811	'	-14,155	-15,810	'	-14,155	-15,810	'
Amounts recognized in accumulated other comprehensive income:	'	'	'	'	'	'	'	'	'	'	'	'
Net actuarial loss	4,831	8,056	'	4,831	8,056	'	4,139	5,501	'	4,139	5,501	'
Prior service cost	'	'	'	'	'	'	-1,346	-1,526	'	-1,346	-1,526	'
Total amount recognized	$4,831	$8,056	'	$4,831	$8,056	'	$2,793	$3,975	'	$2,793	$3,975	'

Employee_Benefit_Plans_Amounts

Employee Benefit Plans - Amounts Recognized in Other Comprehensive (Gain) Loss (Detail) (USD $)

12 Months Ended

In Thousands, unless otherwise specified

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Amounts recognized in other comprehensive (gain) loss:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net actuarial (gain) loss

'

'

'

'

'

'

($2,838)

$2,444

$4,066

($2,838)

$2,444

$4,066

($1,048)

$1,597

$3,390

($1,048)

$1,597

$3,390

Prior service cost

'

'

'

'

'

'

'

'

'

'

'

'

180

'

-1,705

180

'

-1,705

Amortization of prior year service cost

'

'

'

'

'

'

'

'

'

'

'

'

'

180

'

'

180

'

Amortization of (gain) loss

'

'

'

'

'

'

-387

-261

-5

-387

-261

-5

-314

-312

-71

-314

-312

-71

Total amount recognized

($4,407)

$3,648

$5,675

($4,407)

$3,648

$5,675

($3,225)

$2,183

$4,061

($3,225)

$2,183

$4,061

($1,182)

$1,465

$1,614

($1,182)

$1,465

$1,614

Employee_Benefit_Plans_Compone

Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 31, 2012	Dec. 31, 2011
	Pension Benefits [Member]	Pension Benefits [Member]	Pension Benefits [Member]	Other Benefits [Member]	Other Benefits [Member]	Other Benefits [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
							Pension Benefits [Member]	Pension Benefits [Member]	Pension Benefits [Member]	Other Benefits [Member]	Other Benefits [Member]	Other Benefits [Member]
Components of net periodic benefit cost:	'	'	'	'	'	'	'	'	'	'	'	'
Service cost	$295	$276	$275	$236	$207	$227	$295	$276	$275	$236	$207	$227
Interest cost	963	1,055	1,161	513	585	710	963	1,055	1,161	513	585	710
Amortization of loss	387	262	5	314	312	69	387	262	5	314	312	69
Expected return on plan assets	-1,348	-1,301	-1,400	'	-180	'	-1,348	-1,301	-1,400	'	-180	'
Special termination benefits	'	'	'	39	'	'	'	'	'	39	'	'
Amortization of prior service credit	'	'	'	-180	'	'	'	'	'	-180	'	'
Net periodic benefit cost	$297	$292	$41	$922	$924	$1,006	$297	$292	$41	$922	$924	$1,006

Employee_Benefit_Plans_Weighte

Employee Benefit Plans - Weighted-Average Assumptions Used to Determine Benefit Obligations (Detail)

12 Months Ended

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2012

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Defined Benefit Plan Disclosure [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount rate

'

'

'

'

'

'

4.21%

3.30%

4.21%

3.30%

4.46%

3.57%

4.46%

3.57%

4.33%

3.41%

4.33%

3.41%

Expected long-term rate of return on plan assets

7.50%

7.50%

8.50%

7.50%

7.50%

8.50%

'

'

'

'

'

'

'

'

'

'

'

'

Expected long-term rate of return on plan assets

'

'

'

7.50%

7.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee_Benefit_Plans_Weighte1

Employee Benefit Plans - Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost (Detail)

12 Months Ended

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Pension Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Other Benefits [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Defined Benefit Plan Disclosure [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount rate

'

'

'

'

'

'

3.30%

3.89%

4.94%

3.30%

3.89%

4.94%

3.57%

4.07%

5.12%

3.57%

4.07%

5.12%

3.41%

4.00%

5.07%

3.41%

4.00%

5.07%

Expected long-term rate of return on plan assets

7.50%

7.50%

8.50%

7.50%

7.50%

8.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee_Benefit_Plans_Effects

Employee Benefit Plans - Effects of One Percentage-Point Change in Assumed Health Care Cost Trend Rates (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 28, 2013	Dec. 31, 2012
			Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Total service cost and interest cost components, Increase	$66	$73	$66	$73
Estimated APBO, Increase	1,251	1,555	1,251	1,555
Total service cost and interest cost components, Decrease	-55	-63	-55	-63
Estimated APBO, Decrease	($1,073)	($1,331)	($1,073)	($1,331)

Employee_Benefit_Plans_Fair_Va

Employee Benefit Plans - Fair Value of Company's Pension Plans' Assets (Detail) (Pension Benefits [Member], USD $)	Dec. 28, 2013	Dec. 31, 2012	Dec. 29, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	$19,074	'	$17,863	$16,639
Fixed Income Securities [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	19,074	'	17,863	'
Fixed Income Securities [Member] | Intermediate - Government [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,647	'	1,247	'
Fixed Income Securities [Member] | Intermediate - Corporate [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	3,138	'	4,402	'
Fixed Income Securities [Member] | Short Term - Government [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	2,168	'	2,038	'
Fixed Income Securities [Member] | Short Term - Corporate [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	4,040	'	3,123	'
Equity Securities [Member] | U.S. Large Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,221	'	1,063	'
Equity Securities [Member] | U.S. Large Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,536	'	1,037	'
Equity Securities [Member] | U.S. Mid Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	600	'	542	'
Equity Securities [Member] | U.S. Mid Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	603	'	536	'
Equity Securities [Member] | U.S. Small Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	610	'	546	'
Equity Securities [Member] | U.S. Small Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	599	'	539	'
Equity Securities [Member] | International [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	889	'	1,134	'
Cash [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,665	'	1,656	'
Precious Metals [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	358	'	'	'
Continental Cement Company, L.L.C. [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	19,074	17,863	17,863	16,639
Continental Cement Company, L.L.C. [Member] | Fixed Income Securities [Member] | Intermediate - Government [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,647	1,247	'	'
Continental Cement Company, L.L.C. [Member] | Fixed Income Securities [Member] | Intermediate - Corporate [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	3,138	4,402	'	'
Continental Cement Company, L.L.C. [Member] | Fixed Income Securities [Member] | Short Term - Government [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	2,168	2,038	'	'
Continental Cement Company, L.L.C. [Member] | Fixed Income Securities [Member] | Short Term - Corporate [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	4,040	3,123	'	'
Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Large Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,221	1,063	'	'
Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Large Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,536	1,037	'	'
Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Mid Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	600	542	'	'
Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Mid Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	603	536	'	'
Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Small Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	610	546	'	'
Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Small Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	599	539	'	'
Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | International [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	889	1,134	'	'
Continental Cement Company, L.L.C. [Member] | Cash [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,665	1,656	'	'
Continental Cement Company, L.L.C. [Member] | Precious Metals [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	358	'	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income Securities [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	8,081	'	7,053	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | U.S. Large Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,221	'	1,063	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | U.S. Large Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,536	'	1,037	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | U.S. Mid Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	600	'	542	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | U.S. Mid Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	603	'	536	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | U.S. Small Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	610	'	546	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | U.S. Small Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	599	'	539	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | International [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	889	'	1,134	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,665	'	1,656	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Precious Metals [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	358	'	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Continental Cement Company, L.L.C. [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	8,081	7,053	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Large Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,221	1,063	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Large Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,536	1,037	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Mid Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	600	542	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Mid Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	603	536	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Small Cap Value [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	610	546	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | U.S. Small Cap Growth [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	599	539	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Continental Cement Company, L.L.C. [Member] | Equity Securities [Member] | International [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	889	1,134	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Continental Cement Company, L.L.C. [Member] | Cash [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,665	1,656	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Continental Cement Company, L.L.C. [Member] | Precious Metals [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	358	'	'	'
Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	10,993	'	10,810	'
Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | Intermediate - Government [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,647	'	1,247	'
Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | Intermediate - Corporate [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	3,138	'	4,402	'
Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | Short Term - Government [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	2,168	'	2,038	'
Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | Short Term - Corporate [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	4,040	'	3,123	'
Observable Inputs (Level 2) [Member] | Continental Cement Company, L.L.C. [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	10,993	10,810	'	'
Observable Inputs (Level 2) [Member] | Continental Cement Company, L.L.C. [Member] | Fixed Income Securities [Member] | Intermediate - Government [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	1,647	1,247	'	'
Observable Inputs (Level 2) [Member] | Continental Cement Company, L.L.C. [Member] | Fixed Income Securities [Member] | Intermediate - Corporate [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	3,138	4,402	'	'
Observable Inputs (Level 2) [Member] | Continental Cement Company, L.L.C. [Member] | Fixed Income Securities [Member] | Short Term - Government [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	2,168	2,038	'	'
Observable Inputs (Level 2) [Member] | Continental Cement Company, L.L.C. [Member] | Fixed Income Securities [Member] | Short Term - Corporate [Member]	'	'	'	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'	'	'	'
Total fair value	$4,040	$3,123	'	'

Employee_Benefit_Plans_Estimat

Employee Benefit Plans - Estimated Benefit Payments (Detail) (USD $)	Dec. 28, 2013
In Thousands, unless otherwise specified
Pension Benefits [Member]	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'
2014	$1,694
2015	1,704
2016	1,739
2017	1,737
2018	1,774
2019 - 2023	8,667
Total	17,315
Pension Benefits [Member] | Continental Cement Company, L.L.C. [Member]	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'
2014	1,694
2015	1,704
2016	1,739
2017	1,737
2018	1,774
2019 - 2023	8,667
Total	17,315
Other Benefits [Member]	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'
2014	1,269
2015	1,109
2016	1,130
2017	963
2018	1,018
2019 - 2023	4,512
Total	10,001
Other Benefits [Member] | Continental Cement Company, L.L.C. [Member]	'
Pension Plans, Postretirement and Other Employee Benefits [Line Items]	'
2014	1,269
2015	1,109
2016	1,130
2017	963
2018	1,018
2019 - 2023	4,512
Total	$10,001

Accrued_Mining_and_Landfill_Re2

Accrued Mining and Landfill Reclamation - Additional Information (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Millions, unless otherwise specified
Asset Retirement Obligation Disclosure [Abstract]	'	'
Current portion of liabilities	$0.50	$0.40

Accrued_Mining_and_Landfill_Re3

Accrued Mining and Landfill Reclamation - Activity for Asset Retirement Obligations (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Asset Retirement Obligation Disclosure [Abstract]	'	'
Beginning balance	$14,844	$13,328
Acquired obligations	286	364
Change in cost estimate	721	604
Settlement of reclamation obligations	-1,201	-77
Additional liabilities incurred	414	'
Accretion expense	717	625
Ending balance	$15,781	$14,844

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended						12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 28, 2013	Dec. 31, 2012	Dec. 28, 2013
				Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Maximum [Member]
					Loss from Catastrophes [Member]	Loss from Catastrophes [Member]
Loss Contingencies [Line Items]	'	'	'	'	'	'	'
Amount funded for loss incurred by joint venture	$8.80	$4	$4.80	'	'	'	'
Accrual recorded in other noncurrent liabilities	4.3	4.3	'	'	'	'	'
Recognized losses on indemnification agreement	'	8	1.9	'	'	'	'
Charges recognized for lost product	0.8	'	'	'	'	'	'
Charges recognized for lost product included in accrued expenses	0.9	0.9	'	'	0.9	0.9	'
Unapproved change orders and claims	3.2	4.8	'	'	'	'	'
Costs and estimated earnings in excess of billings	0.5	1.6	'	'	'	'	'
Other assets	$2.70	$3.20	'	'	'	'	'
Duration of commitments	'	'	'	'	'	'	'1 year
Terms of purchase commitments	'	'	'	'Less than one year	'	'	'
Percentage of company's employees under collective bargaining arrangements	'	'	'	62.00%	'	'	'
Collective bargaining agreements expire period	'	'	'	'Between 2013 and 2015	'	'	'
Contract expiration date	'	'	'	'2013	'	'	'
Contract term extension	'	'	'	'2018	'	'	'

RelatedParty_Transactions_Addi

Related-Party Transactions - Additional Information (Detail) (USD $)

12 Months Ended

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2011

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Blackstone Management Partners L.L.C. [Member]

Blackstone Management Partners L.L.C. [Member]

Blackstone Management Partners L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Noncontrolling [Member]

Noncontrolling [Member]

Noncontrolling [Member]

Summit Materials Llc [Member]

Summit Materials Llc [Member]

Summit Materials Llc [Member]

Green America Recycling Llc [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Related Party Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Management fees incurred

'

'

'

'

'

'

$2,600,000

$2,100,000

$3,000,000

'

'

'

'

'

'

'

'

'

'

Agreement date

'

'

'

'

'

'

30-Jul-09

'

'

'

'

'

'

'

'

'

'

'

'

Purchase of equipment

'

'

'

'

'

'

'

'

2,300,000

'

'

'

'

'

2,300,000

'

'

'

'

Purchase of equipment inclusive of interest

'

'

'

'

'

'

'

'

100,000

'

'

'

'

'

'

'

'

'

'

Revenue from unconsolidated affiliates

600,000

7,900,000

8,600,000

16,578,000

16,303,000

12,269,000

'

'

'

'

'

'

12,700,000

12,500,000

9,500,000

4,500,000

3,800,000

2,800,000

700,000

Costs incurred in connection with several transactions with unconsolidated affiliates

200,000

200,000

700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accounts receivable from affiliates

400,000

1,900,000

'

2,990,000

10,303,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accounts payable to affiliates

0

200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sales to related parties

'

'

'

'

'

'

'

'

'

12,700,000

12,500,000

9,500,000

'

'

'

'

'

'

'

Accounts receivables due from related parties

'

'

'

422,000

1,193,000

'

'

'

'

200,000

1,000,000

'

200,000

1,000,000

'

200,000

200,000

'

'

Accounts payable to noncontrolling member

700,000

2,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accrued interest on related party settlement year

'2014

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accrued interest due to non-controlling interest

'

'

'

$723,000

$2,149,000

'

'

'

'

'

'

'

$700,000

$2,100,000

'

'

'

'

'

AcquisitionRelated_Liabilities2

Acquisition-Related Liabilities - Additional Information (Detail)	12 Months Ended
	Dec. 28, 2013
Minimum [Member]	'
Business Acquisition [Line Items]	'
Period identified for deferred consideration due	'5 years
Maximum [Member]	'
Business Acquisition [Line Items]	'
Period identified for deferred consideration due	'20 years

AcquisitionRelated_Liabilities3

Acquisition-Related Liabilities - Remaining Payments Due under Noncompete and Deferred Consideration Agreements (Detail) (USD $)	Dec. 28, 2013
In Thousands, unless otherwise specified
Business Combinations [Abstract]	'
2014	$10,790
2015	6,742
2016	5,950
2017	5,910
2018	5,370
Thereafter	9,963
Total scheduled payments	44,725
Present value adjustments	-12,242
Total noncompete obligations and deferred consideration	$32,483

Supplemental_Cash_Flow_Informa2

Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Jan. 30, 2012	Dec. 28, 2013	Dec. 31, 2012	Dec. 31, 2011
				Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Cash payments:	'	'	'	'	'	'	'
Cash paid for interest	$52,001	$36,357	$41,790	'	$11,488	$7,353	$12,946
Income taxes	457	799	5,608	'	'	'	'
Non cash financing activities:	'	'	'	'	'	'	'
Proceeds on borrowings due to Summit Materials	'	'	'	156,800	'	156,842	'
Repayment by Summit Materials of long-term debt and accrued interest	'	'	'	'	'	($156,842)	'

Leasing_Arrangements_Additiona

Leasing Arrangements - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 31, 2012	Dec. 31, 2011
				Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Operating Leased Assets [Line Items]	'	'	'	'	'	'
Rent expense, including short-term rentals	$4	$3.50	$4.30	$0.40	$0.50	$0.40
Royalty expense recorded in cost of revenue	$4.50	$3.90	$3.10	'	'	'

Leasing_Arrangements_Minimum_C

Leasing Arrangements - Minimum Contractual Commitments under Long-Term Operating Leases (Detail) (USD $)	Dec. 28, 2013
In Thousands, unless otherwise specified
Operating Leased Assets [Line Items]	'
2014, Operating Leases	$4,034
2015, Operating Leases	3,890
2016, Operating Leases	3,098
2017, Operating Leases	2,376
2018, Operating Leases	1,983
2014, Royalty Agreements	2,044
2015, Royalty Agreements	2,065
2016, Royalty Agreements	1,974
2017, Royalty Agreements	2,047
2018, Royalty Agreements	1,434
Continental Cement Company, L.L.C. [Member]	'
Operating Leased Assets [Line Items]	'
2014, Operating Leases	378
2015, Operating Leases	341
2016, Operating Leases	325
2017, Operating Leases	291
2018, Operating Leases	$291

Redeemable_Noncontrolling_Inte1

Redeemable Noncontrolling Interest - Additional Information (Detail)	12 Months Ended			12 Months Ended
	Dec. 28, 2013	Dec. 28, 2013	31-May-10	Dec. 28, 2013	31-May-10
		Class A Units [Member]	Class B Units [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
				Class A Units [Member]	Class B Units [Member]
Redeemable Noncontrolling Interest [Line Items]	'	'	'	'	'
Number of class units issued	'	'	'	100	100,000,000
Economic interest of redeemable noncontrolling interest, approximately	100.00%	70.00%	'	'	'
Redeemable noncontrolling interest percentage, approximately	'	'	30.00%	'	'
Priority return percentage	'	'	'	11.00%	'
Allowable sharing percentage in distributions and liquidation proceeds	'	'	'	80.00%	'
Anticipated redemption date of the instrument	'2016-05	'	'	'	'

Employee_Long_Term_Incentive_P2

Employee Long Term Incentive Plan - Additional Information (Detail) (USD $)	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
The estimated fair value	$2,200,000	'	'
Dividend yield	0.00%	'	'
Share-based compensation expense	2,300,000	2,500,000	2,500,000
Unrecognized compensation cost	4,600,000	'	'
Weighted average remaining contractual term	'2 years 7 months 6 days	'	'
Class D Units [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Cumulative amount of units vested	$2,531	$1,732	'
Dividend yield	'	'	'
Class D Units [Member] | Time-Vesting Interests [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Units vesting on first anniversary	20.00%	'	'
Units vesting monthly following the first anniversary	80.00%	'	'
Number of years required for remaining units to be vested under vesting condition	'4 years	'	'
Period for non vested units for automatic forfeiture without consideration	'8 years	'	'
Fair value of time-vesting units	584	1,100	3,400
Weighted-average grant-date fair value	$2,786	$3,761	$3,876

Employee_Long_Term_Incentive_P3

Employee Long Term Incentive Plan - Summary of Information for Class D Unit Interests (Detail) (Class D Units [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Time-Vesting Interests [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Number of units, Beginning balance	1,692	'	'
Number of units, Granted	584	1,100	3,400
Number of units, Vested	-772	'	'
Number of units, Forfeited	-2	'	'
Number of units, Cancelled	-61	'	'
Number of units, Ending balance	1,441	1,692	'
Weighted average grant-date fair value, Beginning balance	$3,864	'	'
Weighted average grant-date fair value, Granted	$2,786	$3,761	$3,876
Weighted average grant-date fair value, Vested	$3,896	'	'
Weighted average grant-date fair value, Forfeited	$3,893	'	'
Weighted average grant-date fair value, Cancelled	$2,208	'	'
Weighted average grant-date fair value, Ending balance	'	$3,864	'
Performance-Vesting Interests [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Number of units, Beginning balance	4,202	'	'
Number of units, Granted	759	'	'
Number of units, Forfeited	-5	'	'
Number of units, Cancelled	-79	'	'
Number of units, Ending balance	4,877	'	'
Weighted average grant-date fair value, Beginning balance	$3,087	'	'
Weighted average grant-date fair value, Granted	$2,314	'	'
Weighted average grant-date fair value, Vested	$0	'	'
Weighted average grant-date fair value, Forfeited	$3,176	'	'
Weighted average grant-date fair value, Cancelled	$1,388	'	'
Weighted average grant-date fair value, Ending balance	'	'	'

Employee_Long_Term_Incentive_P4

Employee Long Term Incentive Plan - Weighted Average Assumptions Used to Estimate the Fair Value of Grants (Detail)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Class D Units	'	'	'
Dividend yield	0.00%	'	'
Class D Units [Member]	'	'	'
Class D Units	'	'	'
Risk-free interest rate, Minimum	'	'	1.71%
Risk-free interest rate	0.50%	1.62%	'
Risk-free interest rate, Maximum	'	'	2.39%
Dividend yield	'	'	'
Volatility rate, Minimum	'	'	42.00%
Volatility	58.00%	47.00%	'
Volatility rate, Maximum	'	'	49.00%
Expected term	'4 years	'	'
Class D Units [Member] | Minimum [Member]	'	'	'
Class D Units	'	'	'
Expected term	'	'6 years	'6 years
Class D Units [Member] | Maximum [Member]	'	'	'
Class D Units	'	'	'
Expected term	'	'8 years	'8 years

Segment_Information_Additional

Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 28, 2013
	Segment
Segment Reporting [Abstract]	'
Number of operating segments	3

Segment_Information_Summary_of

Segment Information - Summary of Financial Data for Company's Reportable Business Segments (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	$238,267	$316,263	$254,842	$106,829	$231,634	$319,181	$255,556	$119,883	$916,201	$926,254	$789,076
Total capital expenditures	'	'	'	'	'	'	'	'	65,999	45,488	38,656
Income (loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	-105,798	-50,951	-1,441
Interest expense	'	'	'	'	'	'	'	'	56,443	58,079	47,784
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	72,934	68,290	61,377
Goodwill impairment	'	'	'	'	'	'	'	'	68,202	'	'
Total assets	1,247,794	'	'	'	1,281,213	'	'	'	1,247,794	1,281,213	1,284,265
Central Region [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Goodwill impairment	'	'	'	'	'	'	'	'	'	'	'
West Region [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Goodwill impairment	'	'	'	'	'	'	'	'	53,264	'	'
East Region [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Goodwill impairment	'	'	'	'	'	'	'	'	14,938	'	'
Operating Segments [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total capital expenditures	'	'	'	'	'	'	'	'	62,639	44,725	38,645
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	72,468	68,209	61,290
Total assets	1,233,451	'	'	'	1,262,721	'	'	'	1,233,451	1,262,721	1,276,376
Operating Segments [Member] | Aggregates [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	159,019	146,991	116,082
Operating Segments [Member] | Asphalt [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	76,211	77,676	69,664
Operating Segments [Member] | Ready Mixed Concrete [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	112,878	100,941	94,302
Operating Segments [Member] | Cement [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	219,811	242,458	182,952
Operating Segments [Member] | Construction and Paving [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	478,280	505,189	464,866
Operating Segments [Member] | Central Region [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	329,621	302,113	264,008
Total capital expenditures	'	'	'	'	'	'	'	'	33,030	20,996	20,078
Income (loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	72,918	65,767	65,651
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	33,808	30,215	27,646
Total assets	657,421	'	'	'	610,003	'	'	'	657,421	610,003	587,341
Operating Segments [Member] | West Region [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	426,195	484,922	362,577
Total capital expenditures	'	'	'	'	'	'	'	'	21,856	14,993	9,256
Income (loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	28,607	14,429	36,442
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	24,167	23,771	19,706
Total assets	383,544	'	'	'	428,115	'	'	'	383,544	428,115	451,017
Operating Segments [Member] | East Region [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	160,385	139,219	162,491
Total capital expenditures	'	'	'	'	'	'	'	'	7,753	8,736	9,311
Income (loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	15,134	10,782	15,504
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	14,493	14,223	13,938
Total assets	192,486	'	'	'	224,603	'	'	'	192,486	224,603	238,018
Corporate and Other [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total capital expenditures	'	'	'	'	'	'	'	'	3,360	763	11
Income (loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	-24,878	-15,560	-9,877
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	466	81	87
Total assets	14,343	'	'	'	18,492	'	'	'	14,343	18,492	7,889
Operating Segment and Corporate and Other [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Income (loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	91,781	75,418	107,720
Segment Reconciling Items [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	56,443	58,079	47,784
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	72,934	68,290	61,377
Goodwill impairment	'	'	'	'	'	'	'	'	68,202	'	'
Other [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	($129,998)	($147,001)	($138,790)

Senior_Notes_Guarantor_and_Non2

Senior Notes' Guarantor and Non-Guarantor Financial Information - Additional Information (Detail)	Dec. 28, 2013
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]	'
Percentage of ownership	100.00%

Senior_Notes_Guarantor_and_Non3

Senior Notes' Guarantor and Non-Guarantor Financial Information - Schedule of Condensed Consolidating Balance Sheets (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Current assets:	'	'	'
Cash	$14,917	$27,431	'
Accounts receivable, net	99,337	100,298	'
Cost and estimated earnings in excess of billings	10,767	11,575	'
Inventories	96,432	92,977	'
Other current assets	13,181	10,068	'
Total current assets	234,634	242,349	'
Property, plant and equipment, net	831,778	813,607	'
Goodwill	127,038	179,120	153,375
Intangible assets, net	15,147	8,606	'
Other assets	39,197	37,531	'
Total assets	1,247,794	1,281,213	1,284,265
Current liabilities:	'	'	'
Current portion of debt	30,220	4,000	'
Current portion of acquisition-related liabilities	10,635	9,525	'
Accounts payable	72,104	61,634	'
Accrued expenses	57,251	49,822	'
Billings in excess of costs and estimated earnings	9,263	6,926	'
Total current liabilities	179,473	131,907	'
Long-term debt	658,767	635,843	'
Acquisition-related liabilities	23,756	23,919	'
Other noncurrent liabilities	77,480	84,266	'
Total liabilities	939,476	875,935	'
Redeemable noncontrolling interest	24,767	22,850	'
Total member's interest	283,551	382,428	'
Total liabilities, redeemable members' interest and member's interest	1,247,794	1,281,213	'
Summit Materials LLC (Parent) [Member]	'	'	'
Current assets:	'	'	'
Cash	10,375	697	'
Intercompany receivables	38,134	14,931	'
Other current assets	750	25	'
Total current assets	49,259	15,653	'
Property, plant and equipment, net	3,969	1,074	'
Other assets	296,494	374,581	'
Total assets	349,722	391,308	'
Current liabilities:	'	'	'
Current portion of debt	26,010	'	'
Current portion of acquisition-related liabilities	2,000	'	'
Accounts payable	5,455	2,745	'
Accrued expenses	12,041	6,877	'
Total current liabilities	45,506	9,622	'
Long-term debt	19,587	'	'
Acquisition-related liabilities	85	'	'
Other noncurrent liabilities	959	395	'
Total liabilities	66,137	10,017	'
Total member's interest	283,585	381,291	'
Total liabilities, redeemable members' interest and member's interest	349,722	391,308	'
Non-Wholly-Owned Guarantor [Member]	'	'	'
Current assets:	'	'	'
Cash	9	397	'
Accounts receivable, net	4,587	7,421	'
Intercompany receivables	3,433	15,557	'
Inventories	10,402	7,073	'
Other current assets	444	726	'
Total current assets	18,875	31,174	'
Property, plant and equipment, net	301,908	287,677	'
Goodwill	23,124	23,124	'
Intangible assets, net	642	742	'
Other assets	17,973	11,891	'
Total assets	362,522	354,608	'
Current liabilities:	'	'	'
Current portion of debt	1,018	965	'
Accounts payable	9,387	6,715	'
Accrued expenses	9,185	10,742	'
Total current liabilities	19,590	18,422	'
Long-term debt	154,590	155,394	'
Other noncurrent liabilities	20,306	27,091	'
Total liabilities	194,486	200,907	'
Redeemable members' interest	23,450	22,850	'
Total member's interest	144,586	130,851	'
Total liabilities, redeemable members' interest and member's interest	362,522	354,608	'
Wholly-Owned Guarantors [Member]	'	'	'
Current assets:	'	'	'
Cash	3,442	30,981	'
Accounts receivable, net	93,102	90,765	'
Intercompany receivables	30,787	9,018	'
Cost and estimated earnings in excess of billings	10,539	11,428	'
Inventories	85,372	84,555	'
Other current assets	11,715	8,447	'
Total current assets	234,957	235,194	'
Property, plant and equipment, net	518,935	517,994	'
Goodwill	102,942	155,024	'
Intangible assets, net	14,505	7,864	'
Other assets	37,535	161,442	'
Total assets	908,874	1,077,518	'
Current liabilities:	'	'	'
Current portion of debt	3,192	3,035	'
Current portion of acquisition-related liabilities	8,635	9,525	'
Accounts payable	57,142	51,179	'
Accrued expenses	37,342	38,050	'
Intercompany payables	71,556	33,396	'
Billings in excess of costs and estimated earnings	8,837	6,656	'
Total current liabilities	186,704	141,841	'
Long-term debt	484,590	480,449	'
Acquisition-related liabilities	23,671	23,919	'
Other noncurrent liabilities	56,215	56,780	'
Total liabilities	751,180	702,989	'
Total member's interest	157,694	374,529	'
Total liabilities, redeemable members' interest and member's interest	908,874	1,077,518	'
Non-Guarantors [Member]	'	'	'
Current assets:	'	'	'
Cash	3,631	680	'
Accounts receivable, net	3,100	3,255	'
Cost and estimated earnings in excess of billings	228	147	'
Inventories	658	1,349	'
Other current assets	272	2,409	'
Total current assets	7,889	7,840	'
Property, plant and equipment, net	6,966	6,862	'
Goodwill	972	972	'
Other assets	1,303	1,315	'
Total assets	17,130	16,989	'
Current liabilities:	'	'	'
Accounts payable	1,572	2,138	'
Accrued expenses	1,223	1,015	'
Intercompany payables	798	6,110	'
Billings in excess of costs and estimated earnings	426	270	'
Total current liabilities	4,019	9,533	'
Total liabilities	4,019	9,533	'
Total member's interest	13,111	7,456	'
Total liabilities, redeemable members' interest and member's interest	17,130	16,989	'
Eliminations [Member]	'	'	'
Current assets:	'	'	'
Cash	-2,540	-5,324	'
Accounts receivable, net	-1,452	-1,143	'
Intercompany receivables	-72,354	-39,506	'
Other current assets	'	-1,539	'
Total current assets	-76,346	-47,512	'
Other assets	-314,108	-511,698	'
Total assets	-390,454	-559,210	'
Current liabilities:	'	'	'
Accounts payable	-1,452	-1,143	'
Accrued expenses	-2,540	-6,862	'
Intercompany payables	-72,354	-39,506	'
Total current liabilities	-76,346	-47,511	'
Total liabilities	-76,346	-47,511	'
Redeemable noncontrolling interest	24,767	22,850	'
Redeemable members' interest	-23,450	-22,850	'
Total member's interest	-315,425	-511,699	'
Total liabilities, redeemable members' interest and member's interest	($390,454)	($559,210)	'

Senior_Notes_Guarantor_and_Non4

Senior Notes' Guarantor and Non-Guarantor Financial Information - Schedule of Condensed Consolidating Statements of Operations and Comprehensive (Loss) Income (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	$238,267	$316,263	$254,842	$106,829	$231,634	$319,181	$255,556	$119,883	$916,201	$926,254	$789,076
Cost of revenue (excluding items shown separately below)	'	'	'	'	'	'	'	'	677,052	713,346	597,654
General and administrative expenses	'	'	'	'	'	'	'	'	142,000	127,215	95,826
Goodwill impairment	'	'	'	'	'	'	'	'	68,202	'	'
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	72,934	68,290	61,377
Transaction costs	'	'	'	'	'	'	'	'	3,990	1,988	9,120
Operating (loss) income	-57,742	37,895	13,731	-41,861	13,322	33,249	9,015	-40,171	-47,977	15,415	25,099
Other expense (income), net	'	'	'	'	'	'	'	'	1,378	8,287	-21,244
Interest expense	'	'	'	'	'	'	'	'	56,443	58,079	47,784
(Loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	-105,798	-50,951	-1,441
Income tax expense (benefit)	'	'	'	'	'	'	'	'	-2,647	-3,920	3,408
(Loss) income from continuing operations	-70,191	22,950	244	-56,154	433	19,656	-5,621	-61,499	-103,151	-47,031	-4,849
Loss from discontinued operations	271	160	-26	123	535	1,287	2,221	-497	528	3,546	5,201
Net (loss) income	-70,462	22,790	270	-56,277	-102	18,369	-7,842	-61,002	-103,679	-50,577	-10,050
Net income (loss) attributable to noncontrolling interest	'	'	'	'	'	'	'	'	3,112	1,919	695
Net (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	-106,791	-52,496	-10,745
Comprehensive (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	-103,706	-55,049	-15,050
Summit Materials LLC (Parent) [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
General and administrative expenses	'	'	'	'	'	'	'	'	7,241	8	1,453
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	465	81	87
Operating (loss) income	'	'	'	'	'	'	'	'	-7,706	-89	-1,540
Other expense (income), net	'	'	'	'	'	'	'	'	99,085	52,400	8,510
(Loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	-106,791	-52,489	-10,050
Income tax expense (benefit)	'	'	'	'	'	'	'	'	'	5	'
(Loss) income from continuing operations	'	'	'	'	'	'	'	'	-106,791	-52,494	-10,050
Net (loss) income	'	'	'	'	'	'	'	'	-106,791	-52,494	-10,050
Net income (loss) attributable to noncontrolling interest	'	'	'	'	'	'	'	'	'	'	695
Net (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	-106,791	-52,494	-10,745
Comprehensive (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	-106,791	-52,494	-9,375
Non-Wholly-Owned Guarantor [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	80,759	81,516	70,064
Cost of revenue (excluding items shown separately below)	'	'	'	'	'	'	'	'	55,241	58,319	41,221
General and administrative expenses	'	'	'	'	'	'	'	'	7,673	6,235	3,933
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	11,378	10,093	9,697
Operating (loss) income	'	'	'	'	'	'	'	'	6,467	6,869	15,213
Other expense (income), net	'	'	'	'	'	'	'	'	-3,737	-2,065	-61
Interest expense	'	'	'	'	'	'	'	'	10,702	12,045	14,004
(Loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	-498	-3,111	1,270
(Loss) income from continuing operations	'	'	'	'	'	'	'	'	-498	-3,111	1,270
Net (loss) income	'	'	'	'	'	'	'	'	-498	-3,111	1,270
Net (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	-498	-3,111	1,270
Comprehensive (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	3,909	-6,759	-4,405
Wholly-Owned Guarantors [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	807,921	824,796	700,916
Cost of revenue (excluding items shown separately below)	'	'	'	'	'	'	'	'	611,799	649,577	542,699
General and administrative expenses	'	'	'	'	'	'	'	'	125,778	119,645	89,011
Goodwill impairment	'	'	'	'	'	'	'	'	68,202	'	'
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	60,078	57,080	50,640
Transaction costs	'	'	'	'	'	'	'	'	3,990	1,988	9,120
Operating (loss) income	'	'	'	'	'	'	'	'	-61,926	-3,494	9,446
Other expense (income), net	'	'	'	'	'	'	'	'	-3,410	6,630	-24,375
Interest expense	'	'	'	'	'	'	'	'	49,591	47,293	33,685
(Loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	-108,107	-57,417	136
Income tax expense (benefit)	'	'	'	'	'	'	'	'	-2,647	-3,925	3,408
(Loss) income from continuing operations	'	'	'	'	'	'	'	'	-105,460	-53,492	-3,272
Loss from discontinued operations	'	'	'	'	'	'	'	'	528	3,546	5,201
Net (loss) income	'	'	'	'	'	'	'	'	-105,988	-57,038	-8,473
Net income (loss) attributable to noncontrolling interest	'	'	'	'	'	'	'	'	'	'	695
Net (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	-105,988	-57,038	-9,168
Comprehensive (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	-105,988	-57,038	-13,473
Non-Guarantors [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	41,910	33,074	21,566
Cost of revenue (excluding items shown separately below)	'	'	'	'	'	'	'	'	24,401	18,582	17,204
General and administrative expenses	'	'	'	'	'	'	'	'	1,308	1,327	1,429
Depreciation, depletion, amortization and accretion	'	'	'	'	'	'	'	'	1,013	1,036	953
Operating (loss) income	'	'	'	'	'	'	'	'	15,188	12,129	1,980
Other expense (income), net	'	'	'	'	'	'	'	'	274	-101	124
Interest expense	'	'	'	'	'	'	'	'	382	633	647
(Loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	14,532	11,597	1,209
(Loss) income from continuing operations	'	'	'	'	'	'	'	'	14,532	11,597	1,209
Net (loss) income	'	'	'	'	'	'	'	'	14,532	11,597	1,209
Net (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	14,532	11,597	1,209
Comprehensive (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	14,532	11,597	1,209
Eliminations [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	-14,389	-13,132	-3,470
Cost of revenue (excluding items shown separately below)	'	'	'	'	'	'	'	'	-14,389	-13,132	-3,470
Other expense (income), net	'	'	'	'	'	'	'	'	-90,834	-48,577	-5,442
Interest expense	'	'	'	'	'	'	'	'	-4,232	-1,892	-552
(Loss) from continuing operations before taxes	'	'	'	'	'	'	'	'	95,066	50,469	5,994
(Loss) income from continuing operations	'	'	'	'	'	'	'	'	95,066	50,469	5,994
Net (loss) income	'	'	'	'	'	'	'	'	95,066	50,469	5,994
Net income (loss) attributable to noncontrolling interest	'	'	'	'	'	'	'	'	3,112	1,919	-695
Net (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	91,954	48,550	6,689
Comprehensive (loss) income attributable to member of Summit Materials, LLC	'	'	'	'	'	'	'	'	$90,632	$49,645	$10,994

Senior_Notes_Guarantor_and_Non5

Senior Notes' Guarantor and Non-Guarantor Financial Information - Schedule of Condensed Consolidating Statements of Cash Flows (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash (used for) provided by operating activities	$66,412	$62,279	$23,253
Cash flow from investing activities:	'	'	'
Acquisitions, net of cash acquired	-61,601	-48,757	-161,073
Purchase of property, plant and equipment	-65,999	-45,488	-38,656
Proceeds from the sale of property, plant, and equipment	16,085	8,836	7,157
Proceeds from the sale of investments	'	'	241
Other	'	69	241
Net cash used for investing activities	-111,515	-85,340	-192,331
Cash flow from financing activities	'	'	'
Proceeds from investment by member	'	'	103,630
Net proceeds from debt issuance	230,817	713,361	96,748
Payments on long-term debt	-188,424	-697,438	-49,000
Payments on acquisition-related liabilities	-9,801	-7,519	-4,593
Other	-3	-702	-10
Net cash (used for) provided by financing activities	32,589	7,702	146,775
Net decrease (increase) in cash	-12,514	-15,359	-22,303
Cash-beginning of period	27,431	42,790	65,093
Cash-end of period	14,917	27,431	42,790
Summit Materials LLC (Parent) [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash (used for) provided by operating activities	-232	4,845	-824
Cash flow from investing activities:	'	'	'
Purchase of property, plant and equipment	-3,359	-762	-11
Cash contribution to affiliates	'	'	-135,530
Net cash used for investing activities	-3,359	-762	-135,541
Cash flow from financing activities	'	'	'
Proceeds from investment by member	'	'	103,630
Net proceeds from debt issuance	230,817	713,378	'
Loans received from and payments made on loans from other Summit Companies	-29,121	-25,371	'
Payments on long-term debt	-188,424	-697,438	'
Other	-3	-656	'
Net cash (used for) provided by financing activities	13,269	-10,087	103,630
Net decrease (increase) in cash	9,678	-6,004	-32,735
Cash-beginning of period	697	6,701	39,436
Cash-end of period	10,375	697	6,701
Non-Wholly-Owned Guarantor [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash (used for) provided by operating activities	9,003	12,806	3,808
Cash flow from investing activities:	'	'	'
Purchase of property, plant and equipment	-24,896	-12,174	-5,933
Proceeds from the sale of property, plant, and equipment	3	69	168
Net cash used for investing activities	-24,893	-12,105	-5,765
Cash flow from financing activities	'	'	'
Net proceeds from debt issuance	'	-17	36,456
Loans received from and payments made on loans from other Summit Companies	15,502	-295	'
Payments on long-term debt	'	'	-34,500
Net cash (used for) provided by financing activities	15,502	-312	1,956
Net decrease (increase) in cash	-388	389	-1
Cash-beginning of period	397	8	9
Cash-end of period	9	397	8
Wholly-Owned Guarantors [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash (used for) provided by operating activities	44,746	36,649	17,262
Cash flow from investing activities:	'	'	'
Acquisitions, net of cash acquired	-61,601	-48,757	-161,073
Purchase of property, plant and equipment	-36,629	-31,818	-31,210
Proceeds from the sale of property, plant, and equipment	16,020	8,577	6,880
Proceeds from the sale of investments	'	'	377
Other	'	69	'
Net cash used for investing activities	-82,210	-71,929	-185,026
Cash flow from financing activities	'	'	'
Proceeds from investment by member	'	'	135,530
Net proceeds from debt issuance	'	'	60,292
Loans received from and payments made on loans from other Summit Companies	19,726	39,783	'
Payments on long-term debt	'	'	-14,500
Payments on acquisition-related liabilities	-9,801	-7,519	-4,593
Net cash (used for) provided by financing activities	9,925	32,264	176,729
Net decrease (increase) in cash	-27,539	-3,016	8,965
Cash-beginning of period	30,981	33,997	25,032
Cash-end of period	3,442	30,981	33,997
Non-Guarantors [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash (used for) provided by operating activities	12,895	8,217	2,586
Cash flow from investing activities:	'	'	'
Purchase of property, plant and equipment	-1,115	-734	-1,502
Proceeds from the sale of property, plant, and equipment	62	190	109
Proceeds from the sale of investments	'	'	-136
Net cash used for investing activities	-1,053	-544	-1,529
Cash flow from financing activities	'	'	'
Proceeds from investment by member	'	'	421
Loans received from and payments made on loans from other Summit Companies	-8,891	-8,793	'
Other	'	-284	-10
Net cash (used for) provided by financing activities	-8,891	-9,077	411
Net decrease (increase) in cash	2,951	-1,404	1,468
Cash-beginning of period	680	2,084	616
Cash-end of period	3,631	680	2,084
Eliminations [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net cash (used for) provided by operating activities	'	-238	421
Cash flow from investing activities:	'	'	'
Cash contribution to affiliates	'	'	135,530
Net cash used for investing activities	'	'	135,530
Cash flow from financing activities	'	'	'
Proceeds from investment by member	'	'	-135,951
Loans received from and payments made on loans from other Summit Companies	2,784	-5,324	'
Other	'	238	'
Net cash (used for) provided by financing activities	2,784	-5,086	-135,951
Net decrease (increase) in cash	2,784	-5,324	'
Cash-beginning of period	-5,324	'	'
Cash-end of period	($2,540)	($5,324)	'

Supplementary_Data_Unaudited_S

Supplementary Data (Unaudited) - Supplemental Financial Information (Detail) (USD $)	3 Months Ended								12 Months Ended			3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 31, 2012	Dec. 31, 2011
												Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Schedule Of Condensed Statements Of Operations [Line Items]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Revenue	$238,267	$316,263	$254,842	$106,829	$231,634	$319,181	$255,556	$119,883	$916,201	$926,254	$789,076	$22,509	$34,155	$27,224	$12,361	$25,304	$30,430	$26,141	$13,007	$96,249	$94,882	$79,488
Operating (loss) income	-57,742	37,895	13,731	-41,861	13,322	33,249	9,015	-40,171	-47,977	15,415	25,099	9,259	10,965	9,053	-8,449	7,625	7,124	9,097	-4,468	20,828	19,378	17,022
(Loss) income from continuing operations	-70,191	22,950	244	-56,154	433	19,656	-5,621	-61,499	-103,151	-47,031	-4,849	'	'	'	'	'	'	'	'	'	'	'
Loss (income) from discontinued operations	271	160	-26	123	535	1,287	2,221	-497	528	3,546	5,201	'	'	'	'	'	'	'	'	'	'	'
Net (loss) income	($70,462)	$22,790	$270	($56,277)	($102)	$18,369	($7,842)	($61,002)	($103,679)	($50,577)	($10,050)	$6,668	$8,157	$6,272	($11,232)	$4,694	$3,977	$5,999	($8,045)	$9,865	$6,625	$2,462

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)

Dec. 28, 2013

Dec. 28, 2013

Dec. 31, 2012

Dec. 28, 2013

Dec. 28, 2013

Dec. 29, 2012

Jan. 31, 2012

Dec. 28, 2013

Jan. 30, 2012

Jan. 17, 2014

Jan. 17, 2014

Jan. 17, 2014

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Ten Point Five Zero Percent Senior Notes Due Two Thousand Twenty [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Senior Notes [Member]

Ten Point Five Zero Percent Senior Notes Due Two Thousand Twenty [Member]

Subsequent Event [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate principal amount

'

'

'

'

'

'

'

'

'

'

'

$260,000,000

Debt instrument, face amount

'

'

'

'

250,000,000

250,000,000

250,000,000

'

250,000,000

'

510,000,000

250,000,000

Interest rate

'

'

'

'

'

'

10.50%

'

10.50%

'

10.50%

10.50%

Maturity date

'

'

'

31-Jan-20

31-Jan-20

'

'

31-Jan-20

'

'

'

31-Jan-20

Senior Secured Credit Agreement was amended

'

'

'

'

'

'

'

'

'

'

'

16-Jan-14

Acquisition completed Date

'

'

'

'

'

'

'

'

'

17-Jan-14

'

'

Acquisition amount

'

'

'

'

'

'

'

'

'

179,250,000

'

'

Additional acquisition amount

'

'

'

'

'

'

'

'

'

30,750,000

'

'

Aggregate principal amount pursuant to an indenture governing, issued

669,890,000

155,608,000

156,400,000

'

'

'

'

'

'

'

250,000,000

'

Increase in principal amount of notes issued

'

'

'

'

'

'

'

'

'

'

$260,000,000

'

Accrued_Expenses_Components_of

Accrued Expenses - Components of Accrued Expenses and Other Liabilities (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012	Dec. 28, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified			Continental Cement Company, L.L.C. [Member]	Continental Cement Company, L.L.C. [Member]
Accrued Expenses And Other Liabilities [Line Items]	'	'	'	'
Accrued interest due to Summit Materials	'	'	$3,848	$4,283
Accrued interest due to non-controlling interest	'	'	723	2,149
Accrued post-retirement benefits other than pensions, current portion	'	'	1,268	1,055
Accrued professional fees	'	'	340	400
Accrued payroll, insurance and benefits	'	'	758	897
Accrued bonus liability	'	'	884	1,153
Accrued costs to remove barge from waterway	'	'	880	850
Other	'	'	1,296	736
Total	$57,251	$49,822	$9,997	$11,523

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)

12 Months Ended

0 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Jan. 31, 2012

Jan. 30, 2012

Dec. 28, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Jan. 30, 2012

Dec. 28, 2013

Jan. 31, 2012

Dec. 28, 2013

Dec. 28, 2013

Dec. 29, 2012

Dec. 28, 2013

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Senior Secured Credit Facility, Revolver [Member]

Senior Secured Credit Facility, Revolver [Member]

Senior Secured Credit Facility, Revolver [Member]

Senior Secured Credit Facility [Member]

Senior Secured Credit Facility [Member]

Senior Secured Credit Facility [Member]

Senior Notes [Member]

Senior Notes [Member]

Continental Cement Company, L.L.C. [Member]

Continental Cement Company, L.L.C. [Member]

Long Term Debt Maturities Repayments Of Principal [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt due to Summit Materials

$669,890,000

'

'

'

'

'

'

$155,608,000

$156,400,000

'

'

'

'

'

'

'

'

'

Interest costs incurred

56,443,000

58,079,000

47,784,000

'

'

'

'

11,053,000

12,622,000

14,621,000

'

'

'

'

'

'

'

'

Interest rate - revolving credit commitments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.70%

'

'

'

Refinance of Summit Materials consolidated outstanding indebtedness

'

'

'

'

'

'

142,700,000

'

'

'

'

'

'

'

'

'

'

'

Long term debt due to Summit Materials

'

'

'

'

'

'

156,800,000

'

156,842,000

'

60,300,000

'

'

'

'

'

'

95,300,000

Charge on earnings related to financing fees on debt repaid

3,256,000

3,266,000

2,335,000

'

'

'

'

300,000

'

'

'

'

'

'

'

'

'

'

Maturity date

'

'

'

31-Jan-20

'

'

'

'

'

'

31-Jan-20

'

'

'

'

30-Jan-19

'

30-Jan-19

Maturity date of debt instrument

'

'

'

'

'

'

'

'

'

'

'

'

30-Jan-17

'

30-Jan-17

'

'

'

Debt instrument, face amount

'

'

'

250,000,000

250,000,000

250,000,000

'

'

'

'

'

250,000,000

'

150,000,000

150,000,000

419,900,000

419,900,000

'

Maximum borrowing capacity on credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$422,000,000

'

$422,000,000

Interest rate

'

'

'

'

'

10.50%

'

'

'

'

'

10.50%

'

'

'

'

'

'