Cash payments: Supplemental Cash Flow Information [Abstract] Actuarial (gain) loss Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Number of units, Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Consolidated Entities [Axis] Consolidated Entities [Axis] Goodwill Goodwill Disclosure [Text Block] Other Other Intangible Assets [Member] Number of businesses sold Number Of Businesses Sold Number Of Businesses Sold Redemption premium Redemption Premium Security Exchange Name Security Exchange Name Canadian Subsidiary Credit Agreement, Operating Activities Canadian Subsidiary Credit Agreement Operating Activities [Member] Represents information pertaining to credit agreement of wholly-owned Canadian subsidiary to be used for operating activities. Number of units, Forfeited/Canceled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Summary of Contract Assets and Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Options, Forfeited/Canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Operating leases Operating Lease, Weighted Average Remaining Lease Term Current liabilities Liability, Defined Benefit Plan, Current Cement Cement [Member] Represents the cement segment of the reporting entity. Components of net periodic benefit cost: Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Accrued Mining and Landfill Reclamation Asset Retirement Obligation and Environmental Cost [Policy Text Block] Shares available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Percentage of benefits to be paid on tax receivable agreement Percentage Of Tax Receivable Agreement Percentage of benefits related to tax receivable agreement paid by entity. Net (decrease) increase in cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 2023 Long-Term Debt, Maturity, Year Two Net deferred tax asset Deferred Tax Assets Liabilities, Net, Excluding Recorded In Noncurrent Liabilities Amount, after allocation of valuation allowances, deferred tax liability and foreign deferred tax liability. Net gain on asset and business disposals Gain (Loss) on Disposition of Assets LP Units Limited Partnership Units [Member] Units representing ownership interest in a limited partnership (LP). Short-term—government Short Term Government Securities [Member] Short term government securities. Current portion of acquisition-related liabilities Acquisition Related Liabilities Current The amount of consideration for a business acquisition due in the current period. Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Amortization expense Amortization of Intangible Assets Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Deferred tax assets Deferred Tax Assets, Net Operating leases Operating Lease, Weighted Average Discount Rate, Percent Anti dilutive shares excluded from calculation of earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Components of Inventories Schedule of Inventory, Current [Table Text Block] Amounts recognized in accumulated other comprehensive income: Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [Abstract] Operating leases: Operating Leases [Abstract] Operating Leases [Abstract] Tax receivable agreement (benefit) expense Income Tax Reconciliation, Effect of TRA Expense Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) TRA expense. Business Combination and Asset Acquisition [Abstract] Number of states in which the entity operates Number of States in which Entity Operates Business Acquisition [Axis] Business Acquisition [Axis] Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] Collection terms Revenue From Contract With Customer, Collection Terms Revenue From Contract With Customer, Collection Terms Intrinsic value, units outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Award Type [Domain] Award Type [Domain] Estimated amortization expense Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Local Phone Number Local Phone Number Schedule Of Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Table] Schedule Of Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Table] Schedule Of Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Table] Amortization of gain Defined Benefit Plan, Amortization of Gain (Loss) 6 1/8% Senior Notes, due 2023, issued at par Six Point One Two Five Percentage Senior Notes Due Twenty Twenty Three Issued At Par [Member] Represents 6.125 percent senior notes of the entity due in 2023, issued at par. Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Accumulated Earnings/Deficit Retained Earnings [Member] Depreciation, depletion, amortization and accretion Depreciation Depletion Amortization And Accretion On Asset Retirement Obligation Depreciation depletion amortization and accretion on asset retirement obligation. Non cash financing activities: Non Cash Financing Activities [Abstract] Non Cash Financing Activities [Abstract] Summit Inc. Ownership Percentage Noncontrolling Interest, Ownership Percentage by Parent Members' equity Member Units [Member] Dispositions Goodwill, Disposed During Period Goodwill, Disposed During Period Accounts receivable, net Increase (Decrease) in Accounts Receivable Amounts recognized in other comprehensive (income) loss: Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] Senior notes, aggregate principal amount redeemed Debt Instrument, Repurchased Face Amount 2026 Royalty Agreement Future Minimum Payments Due Year Five Royalty Agreement Future Minimum Payments Due Year Five Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Finance cash payments on finance leases Finance Lease, Principal Payments Basic (USD per share) Earnings Per Share, Basic Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Condensed Consolidating Balance Sheets Condensed Balance Sheet [Table Text Block] Investment in limited partnership Deferred Tax Liability, Investment in Partnership Deferred tax liability attributable to investment in limited partnership. Document Information [Line Items] Document Information [Line Items] Number of units, Beginning balance (in shares) Number of units, Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 2022 Long-Term Debt, Maturity, Year One Finance leases: Finance Leases [Abstract] Finance Leases [Abstract] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Schedule Of Cash Flow Supplemental [Table] Schedule Of Cash Flow Supplemental [Table] Schedule Of Cash Flow Supplemental [Table] Plants, machinery and equipment Machinery and Equipment [Member] Net deferred tax liability Deferred Tax Liabilities, Net Working capital (e.g., accrued compensation, prepaid assets) Deferred Tax Assets Liabilities Working Capital Deferred Tax Assets Liabilities Working Capital Other Other Noncash Income (Expense) Accelerated depreciation Deferred Tax Liabilities, Property, Plant and Equipment Net intangible assets Deferred Tax Assets, Intangible Assets Excluding Goodwill Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets excluding goodwill. Entity Voluntary Filers Entity Voluntary Filers Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Plan Name [Axis] Plan Name [Axis] Total debt Long-term debt Long-term Debt Level 1 Fair Value, Inputs, Level 1 [Member] Cash flow from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Goodwill, impairment loss Goodwill, Impairment Loss Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] State and local income taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Entity Small Business Entity Small Business Operating Leases Lessee, Operating Lease, Liability, Payment, Due [Abstract] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] International Defined Benefit Plan, Equity Securities, Non-US [Member] Acquisition-related liabilities Acquisition Related Liabilities Non Current The amount of consideration for a business acquisition that is not due in the next twelve months. Divestitures Contract with Customer, Asset, Divestitures Contract with Customer, Asset, Divestitures Liabilities and Stockholders' Equity / Member's Interest Liabilities and Equity [Abstract] Unrecognized tax benefits that if recognized would affect the annual effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Accounts payable Increase (Decrease) in Accounts Payable Acquired obligations Asset Retirement Obligation, Liabilities Acquired Amount of asset retirement obligations acquired during the period. Schedule Of Cash Flow Supplemental [Line Items] Schedule Of Cash Flow Supplemental [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Net contributed capital Contribution To Members Equity Capital contributed to limited liability company (LLC). Entity Interactive Data Current Entity Interactive Data Current Thereafter Long-Term Debt, Maturity, after Year Five 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Four Stock option exercises Stock Issued During Period, Value, Stock Options Exercised Multiemployer Plan Name [Axis] Retirement Plan Name [Axis] Cash Defined Benefit Plan, Cash [Member] Voting power (as a percent) Subsidiary Entity Parent Voting Control Percentage The percentage of the the subsidiary's voting power that is controlled by the parent registrant. Balance Sheet Location [Domain] Balance Sheet Location [Domain] Income Tax Authority [Domain] Income Tax Authority [Domain] Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Changes in revenue billed, contract price or cost estimates Contract With Customer, Liability, Cumulative Catch-up Adjustment To Revenue, Change In Revenue Billed, Contract Price Or Cost Estimates, Excluding Manual Reclasses Contract With Customer, Liability, Cumulative Catch-up Adjustment To Revenue, Change In Revenue Billed, Contract Price Or Cost Estimates, Excluding Manual Reclasses Entity Address, State or Province Entity Address, State or Province Leases Lessee, Finance Leases [Text Block] Schedule of Changes in Ownership of Summit Holdings Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block] Payroll and benefits Accrued Employee Benefits, Current Deferred tax assets Deferred Income Tax Assets, Net Current liabilities: Liabilities, Current [Abstract] Capital contributions by member Proceeds from Partnership Contribution Liability recognized Liability, Defined Benefit Plan General and administrative expenses General and administrative expenses General and Administrative Expense Tax Receivable Agreement Tax Receivable Agreement [Member] Information pertaining to the tax receivable agreement. Inventories Inventory Disclosure [Text Block] Noncontrolling Interest Noncontrolling Interest In Lp [Member] Noncontrolling interest attributable to the ownership in Summit Materials Holdings, L.P., of which Summit Materials, LLC is a an indirect wholly owned subsidiary. Accounting Policies [Abstract] Accounting Policies [Abstract] 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Total scheduled payments Contractual Obligation Non-cash loss on debt financings Non Cash Gain Loss On Debt Refinancing Non-cash loss on debt refinancing. Operating lease liability Total operating lease liabilities Operating Lease, Liability Document Transition Report Document Transition Report Common stock Common Stock, Value, Issued Finance lease Finance Lease, Weighted Average Discount Rate, Percent Term of payment for deferred consideration Deferred Consideration, Payment Term Term of payment for deferred consideration associated with a business acquisition. Number of units, Beginning balance (in dollars per share) Number of units, Ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Leases Lessee, Operating Leases [Text Block] Schedule of Carrying Value and Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Amortization Funded status of plans Defined Benefit Plan, Funded (Unfunded) Status of Plan Acquisitions and Dispositions Business Combination Disclosure [Text Block] Change in cost estimate Asset Retirement Obligation, Revision of Estimate ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Auditor [Line Items] Auditor [Line Items] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Ownership [Axis] Ownership [Axis] Legal Entity [Axis] Legal Entity [Axis] Add: Share-based payment arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Goodwill Goodwill [Line Items] Amortization of prior year service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax Assumed health care cost trend rates Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Class of Stock [Axis] Class of Stock [Axis] Interest expense (income) Interest Income (Expense), Net Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Work in process Inventory, Work in Process, Net of Reserves Thereafter Finance Lease, Liability, to be Paid, after Year Five Financial liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Accrued expenses Total Accrued Liabilities, Current Entity [Domain] Entity [Domain] Revenue Revenue from Contract with Customer, Excluding Assessed Tax 5 1⁄8% Senior Notes, due 2025 Five Point One Two Five Percentage Senior Notes Due Twenty Twenty Five [Member] Represents the 5.125 percent senior notes of the entity due in 2025. Finished goods Inventory, Finished Goods, Net of Reserves Decrease (increase) in operating assets, net of acquisitions and dispositions: Increase (Decrease) in Operating Assets [Abstract] Revenue Recognition Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Time-vesting stock options Share-based Payment Arrangement, Option [Member] Consolidation Items [Domain] Consolidation Items [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Equity [Abstract] Equity [Abstract] Measurement Input Type [Domain] Measurement Input Type [Domain] Variable Rate [Axis] Variable Rate [Axis] Segment Information Segment Reporting Disclosure [Text Block] Finance lease Finance Lease, Weighted Average Remaining Lease Term Paving and related services Paving And Related Services [Member] Paving and related services. LP Units Lp Units [Member] Lp Units [Member] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Activity for Asset Retirement Obligations Schedule of Change in Asset Retirement Obligation [Table Text Block] Other Other Products Or Services [Member] Other products or services. Long term portion of deferred consideration and noncompete obligations Deferred Consideration and Noncompete Obligations Noncurrent Fair Value Disclosure Deferred consideration and noncompete obligations noncurrent fair value. Increase (Decrease) In Stockholders' Equity [Rollforward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Year Focus Document Fiscal Year Focus Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Variable Rate [Domain] Variable Rate [Domain] U.S. Mid cap growth Defined Benefit Plan, Equity Securities, US, Mid Cap, Growth [Member] Defined Benefit Plan, Equity Securities, US, Mid Cap, Growth [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Payments on debt Payments on long-term debt Repayments of Debt 2027 - 2031 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] East East [Member] Represents the east region segment of the reporting entity. Term of purchase commitments Purchase Commitment Terms Term of purchase commitment, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Company Information Entity Information [Line Items] Other income, net Other Nonoperating Income (Expense) Long-term debt Long-term Debt, Fair Value Other liabilities Increase (Decrease) in Other Operating Liabilities Other Payments for (Proceeds from) Other Investing Activities Shares redeemed to settle taxes and other Other Equity Activity, Value Represents other stockholder equity activity. Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Maximum Maximum [Member] Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Capital Unit, Class [Domain] Capital Unit, Class [Domain] Auditor Information [Abstract] Auditor Information Provision for income taxes: Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] 6.125 Senior Notes, due 2023 Six Point One Two Five Percentage Senior Notes Due Twenty Twenty Three [Member] Represents 6.125 percent senior notes of the entity due in 2023. Raw materials Inventory, Raw Materials, Net of Reserves Components of Accrued Expenses Schedule of Accrued Liabilities [Table Text Block] Award Type [Axis] Award Type [Axis] Continental Cement Continental Cement Company L L C [Member] Continental Cement Company L.L.C., formerly an non-wholly owned indirect subsidiary, which became a wholly owned indirect subsidiary following parent's purchase of the noncontrolling interest. Cash flow from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Noncontrolling interest in Summit Holdings Stockholders' Equity Attributable to Noncontrolling Interest, Excluding Portion Attributable To Noncontrolling Interest Of Wholly Owned Indirect Subsidiary Of Registrant Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest), excluding portion attributable to noncontrolling interest of the wholly owned indirect subsidiary of the registrant. Aggregate stockpiles Inventory, Ore Stockpiles on Leach Pads, Gross Schedule of Operating Lease Liability Maturities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Stockholders’ equity Stockholders' Equity Attributable to Parent City Area Code City Area Code Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Estimated useful life Property, Plant and Equipment, Useful Life Stockholders' equity / Member's interest Stockholders' Equity Attributable to Parent [Abstract] Tax receivable agreement benefit Tax Receivable Agreement Expense (Income) Amount of expense (income) recognized for the period related to the tax receivable agreement. Business and Credit Concentrations Concentration Risk, Credit Risk, Policy [Policy Text Block] Non-cash compensation Non Cash Compensation Expense Non Cash Compensation Expense Noncurrent operating lease liabilities Noncurrent operating lease liabilities Operating Lease, Liability, Noncurrent Total lease payments Finance Lease, Liability, Payment, Due Current Current Income Tax Expense (Benefit) Debt instrument, face amount Debt Instrument, Face Amount Net periodic (expense) benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) U.S. Small cap value Defined Benefit Plan, Equity Securities, US, Small Cap, Value [Member] Defined Benefit Plan, Equity Securities, US, Small Cap, Value [Member] Operating segment Operating Segments [Member] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Exchange of LP Units to shares of Class A common stock Conversion of Stock, Amount Converted Restricted Stock Units Restricted Stock Units (RSUs) [Member] Summary of Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Condensed Financial Statements [Table] Condensed Financial Statements [Table] Total finance lease liabilities Finance Lease, Liability Schedule of Lease Assets and Liabilities Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Construction contract receivables Billed Contracts Receivable Business Acquisition [Line Items] Business Acquisition [Line Items] Equity Securities Defined Benefit Plan, Equity Securities [Member] Income Statement [Abstract] Income Statement [Abstract] Entity Registrant Name Entity Registrant Name Deferred finance costs Deferred Costs [Abstract] 2024 Finance Lease, Liability, to be Paid, Year Three 2025 Finance Lease, Liability, to be Paid, Year Four Options, Forfeited/Canceled (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Income tax expense (benefit) Income tax expense (benefit) Income tax expense (benefit) Income Tax Expense (Benefit) Other Commitments [Domain] Other Commitments [Domain] 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Accounts receivable, net Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Tax Identification Number Entity Tax Identification Number Change in fair value of plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Financial assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets Document Fiscal Period Focus Document Fiscal Period Focus 2023 Royalty Agreement Future Minimum Payments Due Year Two Royalty Agreement Future Minimum Payments Due Year Two Total current assets Assets, Current Total lease payments Lessee, Operating Lease, Liability, to be Paid Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Property and equipment, gross Finance Lease, Right-Of-Use Asset, Gross Finance Lease, Right-Of-Use Asset, Gross Number of units, Forfeited/Canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Capital Units by Class [Axis] Capital Units by Class [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Current portion of debt Current portion of long-term debt Long-term Debt, Current Maturities Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Options, Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Equity Component [Domain] Equity Component [Domain] 2022 Lessee, Operating Lease, Liability, to be Paid, Year One Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Issuers Summit Materials Llc And Summit Materials Finance Corp [Member] Information pertaining to Summit Materials, LLC and Summit Materials Finance Corp. (collectively, the "Issuers"). Property, plant and equipment Property, plant and equipment including finance lease right-of-use asset, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Schedule Of Deferred Income Tax Assets And Liabilities [Table] Schedule Of Deferred Income Tax Assets And Liabilities [Table] Schedule Of Deferred Income Tax Assets And Liabilities [Table] Supplemental balance sheet information related to leases: Assets and Liabilities, Lessee [Abstract] Fair Value of Company's Pension Plans' Assets Schedule of Allocation of Plan Assets [Table Text Block] Senior Notes' Guarantor and Non-Guarantor Financial Information Condensed Financial Statements [Text Block] Number of unfunded healthcare and life insurance benefit plans Number Of Unfunded Healthcare And Life Insurance Benefit Plans Number Of Unfunded Healthcare And Life Insurance Benefit Plans 2025 Lessee, Operating Lease, Liability, to be Paid, Year Four Gross Carrying Amount Intangible Assets, Gross (Excluding Goodwill) Purchase price percentage Purchase Price Percentage Lower Of Fair Market Value Purchase Price Percentage Lower Of Fair Market Value Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Line Items] Current finance lease liabilities Finance lease obligations Finance Lease, Liability, Current Income from operations before taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Auditor Location Auditor Location Segment Reporting [Abstract] Segment Reporting [Abstract] Canadian Subsidiary Credit Agreement Canadian Subsidiary Credit Agreement [Member] Represents information pertaining to credit agreement of wholly-owned Canadian subsidiary. Equipment lease term Lessee, Finance Lease, Term of Contract Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] Interest on lease liabilities Finance Lease, Interest Expense Senior Secured Credit Facilities Senior Secured Credit Facilities [Member] Represents Senior Secured Credit Facilities of the entity. Use of Estimates Use of Estimates, Policy [Policy Text Block] Schedule of Basic Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Prepayment premium Debt Instrument, Prepayment Premium Amount of fee for an early repayment of debt. Finance Leases Finance Lease, Liability, Payment, Due [Abstract] Schedule of Capitalization, Equity [Table] Schedule of Capitalization, Equity [Table] Title of 12(b) Security Title of 12(b) Security 2015 Omnibus Equity Incentive Plan Two Thousand Fifteen Omnibus Equity Incentive Plan [Member] Two Thousand Fifteen Omnibus Equity Incentive Plan [Member] Basis differences from divestitures Effective Income Tax Rate Reconciliation, Divestment Differences Effective Income Tax Rate Reconciliation, Divestment Differences Change in deferred tax asset, net Deferred Income Taxes and Tax Credits Schedule Of Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] Schedule Of Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] Schedule Of Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Weighted average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Table] Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Table] Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Table] Net income attributable to Summit Inc/LLC Net income attributable to Summit Inc. Net Income (Loss) Available to Common Stockholders, Basic Document Type Document Type Product and Service [Domain] Product and Service [Domain] Debt instrument interest rate (as a percent) Senior notes, interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage First lien leverage ratio First Lien Leverage Ratio First lien leverage ratio as defined in the terms of the agreement. Net income attributable to Summit Holdings Net Income (Loss) Attributable to Noncontrolling Interest Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Mineral bearing land and leased interests Land And Asset Retirement Costs [Member] Land and asset retirement costs. Truck and auto fleet Truck And Auto Fleet [Member] Truck and auto fleet. 2024 Contractual Obligation, to be Paid, Year Three Schedule of Lease Cost Lease, Cost [Table Text Block] Equipment And Building Equipment And Building [Member] Equipment And Building Product Product [Member] 100% Owned Guarantors Guarantor Subsidiaries [Member] Postretirement liability adjustment Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Weighted average shares of Class A common stock: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Schedule of Finance Lease Liability Maturities Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Percentage of par value of senior notes Percentage Of Par Value On Senior Notes Percentage of par value on senior notes. Less foreign deferred tax liability (included in other noncurrent liabilities) Deferred Tax Liability, Included in Other Noncurrent Liabilities Amount of deferred tax liability included in other non-current liabilities. 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Three Number of noncontributory defined benefit pension plans Number Of Noncontributory Defined Benefit Pension Plans Number Of Noncontributory Defined Benefit Pension Plans Income on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Revenue: Revenues [Abstract] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Document Period End Date Document Period End Date Fixed Income Securities Fixed Income Securities [Member] Reclassification [Line Items] Reclassification [Line Items] Consolidated Entities [Domain] Consolidated Entities [Domain] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Non-Guarantors Non-Guarantor Subsidiaries [Member] Noncompete agreements, payment term (in general) Noncompete Agreements, Payment Term Noncompete Agreements, Payment Term Summary of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Number of additional shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Stock-Based Compensation Shareholders' Equity and Share-based Payments [Text Block] Estimated Amortization Expense for Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Earnings per share of Class A common stock: Earnings Per Share [Abstract] Foreign currency translation adjustment, net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Write-off of debt discount Debt Instrument, Debt Discount Write-Off Debt Instrument, Debt Discount Write-Off Thereafter Contractual Obligation, to be Paid, after Year Five Condensed Consolidating Statements of Operations and Comprehensive Income Condensed Income Statement [Table Text Block] Common Class A and Restricted Stock Common Class A And Restricted Stock [Member] Common Class A And Restricted Stock Options, Beginning balance (in dollars per share) Options, Ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Less accumulated depreciation Finance Lease, Right-of-Use Asset, Accumulated Amortization Entity Current Reporting Status Entity Current Reporting Status Reconciliation of basic to diluted loss per share Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Beginning of period End of period Total fair value Defined Benefit Plan, Plan Assets, Amount Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Proceeds from investment by member Proceeds from (Repayments) of Partnership Contribution The cash inflow (outflow) from capital received or paid in cash from a partner in a partnership during the period. Expected contributions in 2021 Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Total debt Long-term Debt, Net Carrying amount of long-term debt, net of unamortized discount or premium and debt issuance costs, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Amortization Amortization of Debt Issuance Costs Gain on sale of property, plant and equipment Gain on sale of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment Costs and estimated earnings in excess of billings Balance—January 2, 2021 Balance—January 1, 2022 Contract with Customer, Asset, after Allowance for Credit Loss, Current Eliminations Consolidation, Eliminations [Member] Costs and estimated earnings in excess of billings Contract With Customer, Asset, Cumulative Catch-up Adjustment To Revenue, Change In Revenue Billed, Contract Price Or Estimates, Noncash Contract With Customer, Asset, Cumulative Catch-up Adjustment To Revenue, Change In Revenue Billed, Contract Price Or Estimates, Noncash Discount Rate Measurement Input, Discount Rate [Member] Other Contract with Customer, Asset, Increase (Decrease) for Other Activity Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, from other activities. Leases [Abstract] Leases [Abstract] Cost of revenue (excluding items shown separately below): Cost of Goods and Services Sold [Abstract] Income Taxes Income Tax, Policy [Policy Text Block] LIBOR London Interbank Offered Rate (LIBOR) [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] 2026 Contractual Obligation, to be Paid, Year Five (Decrease) increase in operating liabilities, net of acquisitions and dispositions: Increase (Decrease) in Operating Liabilities [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Diluted (in shares) Weighted average dilutive shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Income Taxes Income Tax Disclosure [Text Block] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Basis spread on variable rate Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Operating Engineers Local 101 Pension Plan Operating Engineers Local 101 Pension Plan [Member] Operating Engineers Local 101 Pension Plan [Member] Deferred tax asset, Investment in limited partnership Deferred Tax Assets, Investments Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Financing lease cost: Finance Lease Cost1 [Abstract] Finance Lease Cost1 [Abstract] Cash flow from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] General and administrative expenses General and Administrative Expense [Member] Principles of Consolidation Consolidation, Policy [Policy Text Block] Entity Shell Company Entity Shell Company West West [Member] Represents the west region segment of the reporting entity. Loans received from and payments made on loans from other Summit Companies Proceeds from (Repayments of) Related Party Debt Expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Total current liabilities Liabilities, Current Loss Contingencies [Table] Loss Contingencies [Table] Asphalt Asphalt [Member] Asphalt. Current Fiscal Year End Date Current Fiscal Year End Date Permanent differences Income Tax Reconciliation Permanent Difference Income Tax Reconciliation Permanent Difference General and administrative expenses General Administrative And Other Expenses General, administrative and other expenses. Statement [Table] Statement [Table] New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Other Commitments [Axis] Other Commitments [Axis] 5 1⁄4% Senior Notes, due 2029 Five Point Two Five Percent Senior Notes Due Two Thousand Twenty Nine [Member] Five Point Two Five Percent Senior Notes Due Two Thousand Twenty Nine Amounts Recognized in Other Comprehensive (Income) Loss Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Other Contract with Customer, Liability, Increase (Decrease) for Other Activities Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from other activities. Statistical Measurement [Axis] Statistical Measurement [Axis] Options, Vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Long-term finance lease liabilities Finance Lease, Liability, Noncurrent Distributions to LP Unitholders Limited Partners' Capital Account, Distribution Amount Intangible assets Total Intangible assets, net Finite-Lived Intangible Assets, Net Goodwill Beginning balance Ending balance Goodwill Settlement of reclamation obligations Asset Retirement Obligation, Liabilities Settled Goodwill by Reportable Segment and in Total Schedule of Goodwill [Table Text Block] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Operating lease cost Operating Lease, Cost Change in retirement plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Schedule of Remaining Payments Under Noncompete and Deferred Consideration Agreements Schedule of Business Acquisitions by Acquisition, Noncompete and Deferred Consideration [Table Text Block] Tabular disclosure of acquisition related liabilities, including deferred consideration and noncompete arrangements. Inventory [Line Items] Inventory [Line Items] Deferred Deferred Income Tax Expense (Benefit) Ohio Valley Asphalt Ohio Valley Asphalt [Member] Ohio Valley Asphalt , LLC, a majority owned indirect subsidiary of Summit Materials, LLC. Weighted average contractual term, unrecognized compensation cost Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Revolving Credit Facility Senior Secured Credit Facility Revolving Credit Facility [Member] Represents revolving credit facility under the entity's Senior Secured Credit Facility. Retention receivables Retention Receivables Amounts earned by entity but held by customers until projects have been fully completed or near completion and are expected to be billed and collected within one year of the balance sheet date (or the normal operating cycle, whichever is longer). Earnings per Share Earnings Per Share, Policy [Policy Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Accounts Receivable Receivable [Policy Text Block] Operating lease right-of-use assets Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Net operating loss Deferred Tax Assets, Operating Loss Carryforwards Interest cost Defined Benefit Plan, Interest Cost Income Statement Location [Axis] Income Statement Location [Axis] Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Ready-mix concrete Ready Mixed Concrete [Member] Ready mixed concrete. 2023 Contractual Obligation, to be Paid, Year Two Schedule of Contractual Payments of Long-Term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Proceeds from the sale of property, plant and equipment Proceeds from the sale of property, plant, and equipment Proceeds from Sale of Property, Plant, and Equipment Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Additional paid-in capital Additional Paid in Capital, Common Stock Other assets Other Assets, Noncurrent Number of business acquisitions Number of Businesses Acquired Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Assumed health care cost, grading Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Segments [Axis] Segments [Axis] Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Summit Materials Incorporated And Summit Holdings LP Summit Materials Incorporated And Summit Holdings L P [Member] Information pertaining to Summit Materials, Inc. and Summit Holdings, LP. Retirement Benefits [Abstract] Retirement Benefits [Abstract] Commodities Broad Basket Defined Benefit Plan, Equity Securities, Commodities [Member] Defined Benefit Plan, Equity Securities, Commodities [Member] Entity File Number Entity File Number Summary of Activity for Deferred Financing Fees Schedule Of Deferred Financing Fees [Table Text Block] Schedule of deferred financing fees. International Fixed Income Securities, Non-US [Member] Fixed Income Securities, Non-US [Member] Share-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Number of reporting units with goodwill Number Of Reporting Units Being Subjected To Goodwill Impairment Test Represents the number of reporting units subject to goodwill impairment testing. SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Multiemployer Plan Name [Domain] Retirement Plan Name [Domain] Debt issuance costs Payments of Financing Costs Variable lease cost Variable Lease, Cost Net actuarial loss (gain) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Building Building [Member] Multiemployer Plans [Line Items] Multiemployer Plan [Line Items] Number of units, Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Receivables from related parties Accounts Receivable, Related Parties Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Property, plant, and equipment and finance lease right-of-use asset, before accumulated depreciation and amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Noncurrent liabilities Liability, Defined Benefit Plan, Noncurrent Assets Assets [Abstract] 2024 Long-Term Debt, Maturity, Year Three Land (non-mineral bearing) Land [Member] Weighted average strike price, outstanding (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Right of use assets obtained in exchange for finance leases obligations Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Awards granted during the period (in shares) Number of units, granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Property, Plant and Equipment, net Property, Plant and Equipment, Policy [Policy Text Block] Options, Beginning balance (in shares) Options, Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Loss on debt financings Gain Loss On Debt Financing Gain loss on debt financing. Debt Instrument [Axis] Debt Instrument [Axis] Accretion expense Accretion Asset Retirement Obligation, Accretion Expense Reclassification, Type [Domain] Reclassification, Type [Domain] Summit Materials Inc Summit Materials Inc [Member] Summit Materials Inc [Member] Landfill airspace and improvements Landfill Airspace And Improvements [Member] Landfill airspace and improvements. Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Series of Individually Immaterial Business Acquisitions Series of Individually Immaterial Business Acquisitions [Member] Excluding delivery and subcontract revenue Excluding Shipping And Handling [Member] Excluding Shipping And Handling [Member] Amortization of prior service credit Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Offering period Share-Based Compensation Arrangement By Share-Based Payment Award, Offering Period Share-Based Compensation Arrangement By Share-Based Payment Award, Offering Period Discount rate Business Combination, Contingent Consideration, Liability, Measurement Input Noncompete and Deferred Consideration Agreements Noncompete And Deferred Consideration Agreements [Member] Information pertaining to noncompete and deferred consideration agreements associated with business acquisitions. Inventory, Current [Table] Inventory, Current [Table] Right of use assets obtained in exchange for operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Inventories Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Schedule of Capitalization, Equity [Line Items] Schedule of Capitalization, Equity [Line Items] Components of Net Deferred Income Tax Liability Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Target allocation Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Other current assets Increase (Decrease) in Other Current Assets Diluted net income attributable to Summit Inc. Net Income (Loss) Attributable to Parent, Diluted Prime rate Prime Rate [Member] Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Number of operating segments Number of Operating Segments Current portion of acquisition-related liabilities and Accrued expenses - Contingent consideration Business Combination, Contingent Consideration, Liability, Current Gain on sale of businesses Gain on sale of business Gain on sale of businesses Gain (Loss) on Disposition of Business Total amount recognized Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 2024 Lessee, Operating Lease, Liability, to be Paid, Year Three Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Mineral leases Lease Agreements [Member] Number of plants Number of Plants Owned and Operated Number of plants owned and operated by the entity. Less: Capitalized loan costs Deferred Costs Net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Summary of Revenue by Products Disaggregation of Revenue [Table Text Block] 2026 Long-Term Debt, Maturity, Year Five Expense for defined contribution plans Defined Contribution Plan, Cost Delivery and subcontract revenue Shipping and Handling [Member] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Term Loan, due 2024: Senior Secured Credit Facility Term Loan Due Two Thousand Twenty Four [Member] Represents term loan of the entity due in 2024 under the entity's Senior Secured Credit Facility. Accrued Liabilities, Current Accrued Liabilities, Current [Member] Accrued Liabilities, Current Number of shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Operating cash payments on operating leases Operating Lease, Payments Other Property, Plant and Equipment, Other Types [Member] Number of reporting units more likely than not fair value exceeds carrying value Reporting Unit, Initial Assessment, Fair Value in Excess of Carrying Amount, Number Of Reporting Units Reporting Unit, Initial Assessment, Fair Value in Excess of Carrying Amount, Number Of Reporting Units 2025 Contractual Obligation, to be Paid, Year Four Net cash paid for acquisitions Business Combination, Consideration Transferred Less: Income tax benefit at federal statutory tax rate for LLC entities Federal Income Tax Expense (Benefit), Continuing Operations Gross amount Total Long-term Debt, Gross Goodwill [Roll Forward] Goodwill [Roll Forward] Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Property and equipment, net Finance Lease, Right-of-Use Asset, after Accumulated Amortization Warrants Stock Warrants [Member] Stock Warrants [Member] Insurance Accrued Insurance, Current Total liabilities and stockholders' equity / member's interest Liabilities and Equity Other Other Accrued Liabilities, Current Tax receivable agreement liability Tax Receivable Agreement Liability Represents the liability due to former holders of LP Units related to the Tax Receivable Agreement. Billings in excess of costs and estimated earnings Balance—January 2, 2021 Balance—January 1, 2022 Contract with Customer, Liability, Current 2026 Lessee, Operating Lease, Liability, to be Paid, Year Five Options, Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Service Service [Member] Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Weighted average discount rate: Lease Discount Rate [Abstract] Lease Discount Rate [Abstract] Earnings Per Share Earnings Per Share [Text Block] 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Minimum Minimum [Member] 6 1⁄2% Senior Notes, due 2027 Six Point Five Percentage Senior Notes Due Twenty Twenty Seven [Member] Six Point Five Percentage Senior Notes Due Twenty Twenty Seven [Member] Change in Contract with Customer, Asset [Abstract] Change in Contract with Customer, Asset [Abstract] 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Amount outstanding Long-term Line of Credit Impact of foreign currency on cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Schedule of Contingent Consideration and Derivatives Measured at Fair Value Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block] LIBOR Plus 1% London Interbank Offered Rate Libor Plus One Percent [Member] Interest rate at which a bank borrows funds from other banks in the London interbank market plus one percent. Beginning balance Ending balance Debt Issuance Costs, Net Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Number of LP Units outstanding (in shares) Number of LP Units outstanding (in shares) Limited Partners' Capital Account, Units Outstanding Mining reclamation reserve Deferred Tax Assets, Mining Reclamation Reserve Deferred tax assets mining reclamation reserve. Schedule Of Accrued Expenses [Line Items] Schedule Of Accrued Expenses [Line Items] Schedule Of Accrued Expenses [Line Items] 2025 Long-Term Debt, Maturity, Year Four Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Foreign currency translation adjustment Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Debt Debt Disclosure [Text Block] Components of Income Tax Benefit Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] U.S. Large cap growth Defined Benefit Plan, Equity Securities, US, Large Cap, Growth [Member] Defined Benefit Plan, Equity Securities, US, Large Cap, Growth [Member] Senior Notes Senior Notes [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Intermediate—government Intermediate Government Securities [Member] Intermediate government securities. Less accumulated depreciation, depletion and amortization Finance lease right-of-use asset accumulated amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Other Business Combination, Consideration Transferred, Other Number of reportable segments Number of Reportable Segments Professional fees Accrued Professional Fees, Current Acquisitions Goodwill, Acquired During Period Reportable Legal Entities Reportable Legal Entities [Member] Healthcare & Life Ins Other Postretirement Benefits Plan [Member] Performance Stock Units Performance Shares [Member] Commitments and contingencies Commitments and Contingencies Contractual payments of long-term debt Long-term Debt, Fiscal Year Maturity [Abstract] Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Emerging Growth Company Entity Emerging Growth Company Number of LP Units exchanged Limited Partners' Capital Account, Units Exchanged The number of limited partner units exchanged. Proceeds net of related fees and expenses Proceeds from Debt, Net of Issuance Costs Less: Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current General collection and billing period for retention receivables Collection and Billing Period, Retention Receivables The general collection and billing period for retention receivables. Movement in Contract Assets and Contract Liabilities [Roll Forward] Movement in Contract Assets and Contract Liabilities [Roll Forward] Movement in Contract Assets and Contract Liabilities Restricted Stock Restricted Stock [Member] Employee Benefit Plans Compensation and Employee Benefit Plans [Text Block] Loan origination fees Payments of Debt Issuance Costs 6 1/8% Senior Notes, due 2023, , issued at 99.375% of par Six Point One Two Five Percentage Senior Notes Due Twenty Twenty Three Issued At99.375 Percent Of Par [Member] Represents 6.125 percent senior notes of the entity due in 2023, issued at 99.375 percent of par. Proceeds from debt issuances Net proceeds from debt issuance Proceeds from Issuance of Debt Issuers Subsidiary Issuer [Member] Auditor Name Auditor Name Cover [Abstract] Cover [Abstract] Changes in revenue billed, contract price or cost estimates Contract With Customer, Asset, Cumulative Catch-up Adjustment To Revenue, Change In Revenue Billed, Contract Price Or Estimates Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in revenue billed, contract price or cost estimates which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Royalty expense recorded in cost of revenue Royalty Expense Remaining payments on contractual obligations Contractual Obligation, Fiscal Year Maturity [Abstract] Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Contributions of Company Multiemployer Plan, Pension, Significant, Employer Contribution, Cost Summary of Information for the Equity Awards Granted Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions Canadian Subsidiary Credit Agreement, Foreign Exchange Facility Canadian Subsidiary Credit Agreement, Foreign Exchange Facility [Member] Canadian Subsidiary Credit Agreement, Foreign Exchange Facility LP Unit exchanges Stock Issued During Period, Value, Conversion of Units Condensed Consolidating Statements of Cash Flows Condensed Cash Flow Statement [Table Text Block] Divestitures Contract with Customer, Liability, Divestitures Contract with Customer, Liability, Divestitures Asset Retirement Obligations [Line Items] Asset Retirement Obligations [Line Items] Asset Retirement Obligations [Line Items] Less imputed interest Finance Lease, Liability, Undiscounted Excess Amount Office equipment Office Equipment [Member] Aggregates Aggregates [Member] Aggregates. Document Information [Table] Document Information [Table] Carrying Value Reported Value Measurement [Member] Auditor [Table] Auditor [Table] 2026 Finance Lease, Liability, to be Paid, Year Five Common Stock Common Stock [Member] Short-term—corporate Short Term Corporate Securities [Member] Short term corporate securities. Buildings and improvements Building Improvements [Member] Operating income Operating Income (Loss) Current operating lease liabilities Current operating lease liabilities Operating Lease, Liability, Current Summary of Organization and Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Less comprehensive income attributable to Summit Holdings Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Expected long-term rate of return on plan assets, benefit obligation Defined Benefit Plan, Assumptions Used Calculating Benefit Obligations, Expected Long-term Return on Assets An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to determine the benefit obligation. 2023 Finite-Lived Intangible Asset, Expected Amortization, Year Two Share-based compensation expense Share-based Payment Arrangement, Noncash Expense Changes in each component of accumulated other comprehensive loss AOCI Attributable to Parent, Net of Tax [Roll Forward] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Depreciation, depletion and amortization expense Depreciation Less tax effect of other comprehensive loss items Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent LP Unit exchanges (in shares) Exchanges during period (in shares) Stock Issued During Period, Shares, Conversion of Units Accrued expenses Increase (Decrease) in Accrued Liabilities Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Net intangible assets Deferred Tax Liabilities, Intangible Assets Excluding Goodwill Deferred Tax Liabilities, Intangible Assets Excluding Goodwill Schedule of Contractual Commitments for Royalty Agreements Lessee, Royalty Agreements, Liability, Maturity [Table Text Block] Lessee, Royalty Agreements, Liability, Maturity Effective tax rate change Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Property, Plant and Equipment, net and Intangibles, net Property, Plant, and Equipment and Intangible Assets [Text Block] Purchases of property, plant and equipment Total purchases of property, plant and equipment Purchase of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Asset Retirement Obligation, Activity Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Total liabilities Total liabilities Liabilities Debt redeemed Payment for Debt Extinguishment or Debt Prepayment Cost 2022 Finite-Lived Intangible Asset, Expected Amortization, Year One Options, Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Summit Holdings LP Summit Holdings Lp [Member] Summit Materials Holdings L.P., a non-wholly owned subsidiary of the registrant. Weighted average strike price, exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Intrinsic value, options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Summary of Acquisitions by Region Schedule of Business Acquisitions, Number of Acquisitions by Region [Table Text Block] Tabular disclosure of the number of business acquisitions by region Consolidation Items [Axis] Consolidation Items [Axis] Measurement Input Type [Axis] Measurement Input Type [Axis] Other assets Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Adjusted Other Assets Business combination recognized identifiable assets acquired and liabilities assumed adjusted other assets. Common stock, shares issued (in shares) Beginning balance stockholders' equity (in shares) Ending balance stockholders' equity (in shares) Common Stock, Shares, Issued Anticipated costs Asset Retirement Obligation, Anticipated Costs The total undiscounted anticipated costs for site reclamation. Weighted average remaining lease term (years): Weighted Average Lease Term And Discount Rate [Abstract] Weighted Average Lease Term And Discount Rate [Abstract] Total amount recognized Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Members' Interest Members' Equity Notes Disclosure [Text Block] 8 1/2% Senior Notes, due 2022 Senior Notes8.5 Percent Due2022 [Member] Represents 8.5 percent senior notes of the entity due in 2022. Schedule of Assumptions Used Defined Benefit Plan, Assumptions [Table Text Block] Current year decreases (increases) from operations Valuation Allowance, Deferred Tax Asset, Current Year Increase (Decrease) From Operations Valuation Allowance, Deferred Tax Asset, Current Year Increase (Decrease) From Operations Distributions Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared Entity Address, City or Town Entity Address, City or Town Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Estimated Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Schedule of Changes in Each Component of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Interest expense Interest Expense 2022 Finance Lease, Liability, to be Paid, Year One Expected long-term rate of return on plan assets, net periodic benefit cost Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Purchase price Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Current portion of deferred consideration and noncompete obligations Deferred Consideration and Noncompete Obligations Current Fair Value Disclosure Deferred consideration and noncompete obligations current fair value. 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year One Accumulated earnings Retained Earnings (Accumulated Deficit) Beginning balance Ending balance Asset Retirement Obligation Non-income taxes Accrual for Taxes Other than Income Taxes, Current Payments on acquisition-related liabilities Payments of Merger Related Costs, Financing Activities Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Fair Value Estimate of Fair Value Measurement [Member] Accrued Mining and Landfill Reclamation Asset Retirement Obligation Disclosure [Text Block] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Reclassification [Table] Reclassification [Table] Proceeds from stock option exercises Proceeds from Stock Options Exercised 2023 Finance Lease, Liability, to be Paid, Year Two Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Total stockholders’ equity Beginning balance stockholders' equity Ending balance stockholders' equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Amendment Flag Amendment Flag Equity Components [Axis] Equity Components [Axis] Valuation Allowance: SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Inventories Total Inventory, Net Summary of Financial Data for Company's Reportable Business Segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Unrecognized tax benefits Effective Income Tax Rate Reconciliation, Uncertain Tax Positions Effective Income Tax Rate Reconciliation, Uncertain Tax Positions Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Acquisition-related liabilities and Other noncurrent liabilities - Contingent consideration Business Combination, Contingent Consideration, Liability, Noncurrent Percentage added to base rate Debt Instrument, Reference Rate, Additional Percentage Percentage points added to the base rate to determine reference rate. Product and Service [Axis] Product and Service [Axis] Entity Public Float Entity Public Float Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Short-term lease cost Short-term Lease, Cost Obligations and Funded Status Schedule of Net Funded Status [Table Text Block] Deferred tax assets subject to TRA Deferred Tax Assets Subject to Tax Receivable Agreement Deferred tax assets subject to Tax Receivable Agreement. Schedule of Multiemployer Plans [Table] Multiemployer Plan [Table] U.S. Mid cap value Defined Benefit Plan, Equity Securities, US, Mid Cap, Value [Member] Defined Benefit Plan, Equity Securities, US, Mid Cap, Value [Member] Statement [Line Items] Statement [Line Items] Financial Instruments Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Other (income) loss, net Other Nonoperating Income Expense Net Other Nonoperating Income Expense Net Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Federal Domestic Tax Authority [Member] Cement Plant Cement Plant [Member] Cement plant facility. Debt Disclosure [Abstract] Debt Disclosure [Abstract] 2022 Contractual Obligation, to be Paid, Year One Asset retirement obligation, current Asset Retirement Obligation, Current Accrued Expenses [Table] Accrued Expenses [Table] Accrued Expenses [Table] Property, Plant and Equipment, Type [Axis] Long-Lived Intangible Asset [Axis] Long-Lived Tangible Asset [Axis] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Less valuation allowance Deferred tax asset, valuation allowance Beginning balance Ending balance Deferred Tax Assets, Valuation Allowance Intercompany payables Intercompany Payables Liabilities Current Intercompany Payables Liabilities Current Corporate and other Corporate, Non-Segment [Member] 2024 Royalty Agreement Future Minimum Payments Due Year Three Royalty Agreement Future Minimum Payments Due Year Three Options, granted (in shares) Options, Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Document Annual Report Document Annual Report Weighted average remaining lease term (years): Lease Term [Abstract] Lease Term [Abstract] Total assets Total assets Assets Add: Nonvested restricted stock awards of retirement eligible shares (in shares) Weighted Average Number of Shares, Restricted Stock Plan Name [Domain] Plan Name [Domain] Deferred tax assets (liabilities): Components of Deferred Tax Liabilities [Abstract] Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Total Adjusted EBITDA Adjusted Earnings Before Interest Income Taxes Depreciation And Amortization Adjusted earnings before interest, income taxes, depreciation and amortization (Adjusted EBITDA). Construction Industry Laborers Pension Fund Construction Industry Laborers Pension Fund [Member] Construction Industry Laborers Pension Fund [Member] Precious metals Precious Metals [Member] Precious metals. Summary of Accounts Receivable, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Prior service cost Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Canadian Subsidiary Credit Agreement, Guarantees Canadian Subsidiary Credit Agreement Guarantees [Member] Represents information pertaining to credit agreement of wholly-owned Canadian subsidiary to provide guarantees on behalf of that subsidiary. Canadian Subsidiary Credit Agreement, Capital Equipment Canadian Subsidiary Credit Agreement Capital Equipment [Member] Represents information pertaining to credit agreement of wholly-owned Canadian subsidiary to be used for capital equipment. Net cash provided by operating activities Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Operating Activities Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Schedule of Debt Schedule of Debt [Table Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Summit Materials, LLC Summit Materials Llc [Member] Summit Materials, LLC, a wholly owned indirect subsidiary of the registrant. Basic (in shares) Weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (USD per share) Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Schedule of Multiemployer Plans Multiemployer Plan [Table Text Block] Service cost Defined Benefit Plan, Service Cost Net actuarial (gain) loss Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax 2022 Royalty Agreement Future Minimum Payments Due Year One Royalty Agreement Future Minimum Payments Due Year One Payments for income taxes, net Income Taxes Paid, Net Operating permits Construction Permits [Member] Summary Of Significant Accounting Policies And Recent Accounting Pronouncements Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items] Lease, Cost [Abstract] Lease, Cost [Abstract] Net Carrying Amount Intangible Assets, Net (Excluding Goodwill) Comprehensive income attributable to Summit Materials, Inc. / Summit Materials, LLC Comprehensive income (loss) income attributable to member of Summit Materials, LLC Comprehensive Income (Loss), Net of Tax, Attributable to Parent Deferred asset purchase payments Accrued Asset Purchase Payments, Current Accrued Asset Purchase Payments, Current 2025 Royalty Agreement Future Minimum Payments Due Year Four Royalty Agreement Future Minimum Payments Due Year Four Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Number of units, Exercised (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised in Period, Weighted Average Grant Date Fair Value The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to exercise shares or units, other instruments, or cash in accordance with the terms of the arrangement. Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Schedule of Reconciliation of Income Tax (Benefit) Expense Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Accounts payable Accounts Payable, Current Depreciation, depletion and amortization Depreciation, Depletion and Amortization Shares redeemed to settle taxes and other (in shares) Other equity transactions (in shares) Other Equity Activity, Shares Represents other stockholder equity activity, in shares. Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Inventories Increase (Decrease) in Inventories Add: warrants Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Cost of revenue Cost of Goods and Services Sold Common Class B Common Class B [Member] Proceeds from sale of businesses Proceeds from Divestiture of Businesses Entity Central Index Key Entity Central Index Key Change in Contract with Customer, Liability [Abstract] Change in Contract with Customer, Liability [Abstract] Total lease cost Lease, Cost Asset Retirement Obligations [Table] Asset Retirement Obligations [Table] Asset Retirement Obligations [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Letter of Credit Senior Secured Credit Facility Letter Of Credit [Member] Represents letters of credit under the entity's Senior Secured Credit Facility. Reclassification, Type [Axis] Reclassification, Type [Axis] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Revision Of Prior Period Reclassification Adjustment Out Fixed Overhead Expenses Revision Of Prior Period Reclassification Adjustment Out Fixed Overhead Expenses [Member] Revision Of Prior Period Reclassification Adjustment Out Fixed Overhead Expenses Intermediate—corporate Intermediate Corporate Securities [Member] Intermediate corporate securities. Other noncurrent liabilities Other Liabilities, Noncurrent Condensed Financial Information Disclosure [Abstract] Condensed Financial Information Disclosure [Abstract] Beginning of period End of period Defined Benefit Plan, Benefit Obligation Debt Debt Instrument [Line Items] Debt Instrument [Line Items] Trading Symbol Trading Symbol Billings in excess of costs and estimated earnings Contract With Customer, Liability, Cumulative Catch-up Adjustment To Revenue, Change In Revenue Billed, Contract Price Or Cost Estimates Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in revenue billed, contract pric or cost estimates which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. Includes, but is not limited to, change in assessment of whether estimate of variable consideration is constrained. Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Other Miscellaneous Other Income (Expense) Miscellaneous other income (expense). Equipment Equipment [Member] U.S. Large cap value Defined Benefit Plan, Equity Securities, US, Large Cap, Value [Member] Defined Benefit Plan, Equity Securities, US, Large Cap, Value [Member] Long-term debt Long Term Debt Noncurrent, Net Carrying amount of long-term debt, after unamortized (discount) premium and debt issuance costs, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Net deferred tax liabilities Deferred Tax Assets Liabilities Net Before Valuation Allowances Deferred Tax Assets Liabilities Net Before Valuation Allowances Warrants Warrant [Member] Long-term debt Long-term Debt, Excluding Current Maturities Schedule of Goodwill [Table] Schedule of Goodwill [Table] Share-based compensation expense Share-based Payment Arrangement, Expense Acquisition-related liabilities Business Combination, Consideration Transferred, Liabilities Incurred Tax receivable agreement liability Increase (Decrease) in Tax Receivable Agreement Liability Amount of increase (decrease) in tax receivable agreement liability. Mobile equipment and barges Mobile Equipment And Barges [Member] Mobile equipment and barges. Ownership percentage by non controlling owners Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Present value adjustments Liabilities, Fair Value Adjustment Entities [Table] Entities [Table] Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Depreciation, depletion, amortization and accretion Total depreciation, depletion, amortization and accretion Depreciation Depletion Amortization And Accretion The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, depleting assets or accretion of asset retirement obligations to periods that benefit from use of the related assets. Payables and Accruals [Abstract] Payables and Accruals [Abstract] Construction in progress Construction in Progress [Member] Common Class A Common Class A [Member] Cash and cash equivalents—beginning of period Cash and cash equivalents—end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Common stock, par value (USD per share) Common Stock, Par or Stated Value Per Share Total members' interest Beginning balance members' interest Ending balance members' interest Total member's interest Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Current assets: Assets, Current [Abstract] Other Proceeds from (Payments for) Other Financing Activities Intangible Assets by Type and in Total Schedule of Finite-Lived Intangible Assets [Table Text Block] Postemployment Benefits [Abstract] Postemployment Benefits [Abstract] U.S. Small cap growth Defined Benefit Plan, Equity Securities, US, Small Cap, Growth [Member] Defined Benefit Plan, Equity Securities, US, Small Cap, Growth [Member] Stock option exercises (in shares) Options, Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Disclosure [Abstract] Other comprehensive income Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax Interest Interest Payable, Current Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Penalties and interest expense Income Tax Examination, Penalties and Interest Expense Stockholder's Equity Stockholders' Equity Note Disclosure [Text Block] Measurement Basis [Axis] Measurement Basis [Axis] Cash flow hedge adjustments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Five Auditor Firm ID Auditor Firm ID Net cash used in investing activities Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Change in benefit obligations: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Tax Receivable Agreement Tax Receivable Agreement [Policy Text Block] Disclosure of accounting policy for tax receivable agreement. Number of units, Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Intercompany receivables Intercompany Receivables Assets Current Intercompany Receivables Assets Current Amortization of gain Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Other Than Net Prior Service (Cost) Credit, Net of Tax Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss other than net prior service cost (credit) related to pension and other postretirement benefit plans. Class of Stock [Domain] Class of Stock [Domain] Operating cash payments on finance leases Finance Lease, Interest Payment on Liability Summary of Valuation Allowance Summary of Valuation Allowance [Table Text Block] Maximum borrowing capacity Revolving credit commitment Line of Credit Facility, Maximum Borrowing Capacity Foreign currency translation adjustments Goodwill, Foreign Currency Translation Gain (Loss) Royalty Agreements Royalty Agreement Liabilities Payments Due [Abstract] Royalty Agreement Liabilities Payments Due [Abstract] Reserve rights Reserve Rights [Member] Reserve rights. Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of units, Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised in Period The number of equity-based payment instruments, excluding stock (or unit) options, exercised during the reporting period. Ownership [Domain] Ownership [Domain] Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan Emerging Markets Defined Benefit Plan, Equity Securities, Emerging Markets [Member] Defined Benefit Plan, Equity Securities, Emerging Markets [Member] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Federal funds rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Other current assets Other Assets, Current Other assets Increase (Decrease) in Other Noncurrent Assets Members' equity Members' Capital Income tax expense (benefit) at federal statutory tax rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Distributions Distributions from partnership Payments of Distributions to Affiliates Trade accounts receivable Trade Accounts Receivable Trade receivable amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services. Postretirement liability adjustment, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Write off of deferred financing fees Write off of deferred financing fees Write off of Deferred Debt Issuance Cost Inventories Inventory, Policy [Policy Text Block] Pension Benefits Pension Plan [Member] Debt discount Less: Original issue net discount Debt Instrument, Unamortized Discount Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Total noncompete obligations and deferred consideration Contractual Obligations, Present Value Present value of contractual obligations.