Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Property, plant and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Award Timing Predetermined Award Timing Predetermined [Flag] Holdings Core And Main Holdings, LP [Member] Core And Main Holdings, LP Weighted average interest rate (percent) Long-Term Debt, Weighted Average Interest Rate, at Point in Time Goodwill, expected tax deductible amount Business Combination, Goodwill, Expected Tax Deductible, Amount Entity File Number Entity File Number Additional Paid In Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Basic earnings per share: Earnings Per Share, Basic [Abstract] Supplemental Financial Statement Information Additional Financial Information Disclosure [Text Block] Intangible Asset, Acquired, Finite-Lived [Line Items] Intangible Asset, Acquired, Finite-Lived [Line Items] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Increase (decrease) in accounts payable Increase (Decrease) in Accounts Payable Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic (in dollars per share) Net income per share - basic (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Related Parties Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Revenue Revenue from Contract with Customer [Text Block] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Interest Rate Swap Maturing July 27, 2028 Interest Rate Swap, One [Member] Interest Rate Swap, One Adjustment to Compensation, Amount Adjustment to Compensation Amount Unamortized Discount and Debt Issuance Costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (Increase) decrease in other assets Increase (Decrease) in Other Operating Assets Basis of Presentation - Consolidation Consolidation, Policy [Policy Text Block] Equity-based compensation expense Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Cash paid for income taxes Income Taxes Paid Measurement adjustment gain (loss) for interest rate swap Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Total stockholders’ equity attributable to Core & Main, Inc. Equity, Attributable to Parent Insider Trading Policies and Procedures [Line Items] Schedule of depreciation expense Property, Plant and Equipment [Table Text Block] Common stock, authorized (in shares) Common Stock, Shares Authorized Goodwill and Intangible Assets Disclosure [Abstract] Current assets: Assets, Current [Abstract] Total liabilities and stockholders’ equity Liabilities and Equity Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Long-term debt, Principal Long-Term Debt, Gross, Excluding Current Maturities Amount before unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Fair value of this cash flow interest rate swap asset Cash Flow Hedge Derivative Instrument Assets at Fair Value Transaction value Business Combination, Transaction Valuation Business Combination, Transaction Valuation Cover [Abstract] Operating lease right-of-use assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Operating Lease Right-Of-Use Assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Operating Lease Right-Of-Use Assets Maximum Maximum [Member] Less: net income attributable to non-controlling interests Net income attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Intangible assets, net Net Intangible Finite-Lived Intangible Assets, Net Income Taxes [Line Items] Income Tax Contingency [Line Items] Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares) Stock Issued During Period, Shares, Exchange Of Partnership Interests Stock Issued During Period, Shares, Exchange Of Partnership Interests Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Acquisitions Business Combination [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Common stock Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Other liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Goodwill Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Goodwill Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Goodwill Statement of Stockholders' Equity [Abstract] Statement of Cash Flows [Abstract] Current maturities of long-term debt Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount Less: comprehensive income attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Total comprehensive income attributable to Core & Main, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Management Feeder Continuing Limited Partners, Holdings [Member] Continuing Limited Partners, Holdings Name Measure Name Distributions to non-controlling interest holders Payments to Noncontrolling Interests Current operating lease liabilities Operating Lease, Liability, Current Exchange of Partnership Interests and Class B Shares for Class A Shares Stock Issued During Period, Value, Exchange Of Partnership Interestshares Stock Issued During Period, Value, Exchange Of Partnership Interestshares Class of Stock and Other Items [Line Items] Class of Stock [Line Items] Deferred income taxes Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Pro forma tax rate per agreements (percent) Tax Receivable Agreements, Pro Forma Tax Rate Per Agreement Tax Receivable Agreements, Pro Forma Tax Rate Per Agreement Award Timing Method Award Timing Method [Text Block] Award Type Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Income Tax Contingency [Table] Income Tax Contingency [Table] Legal Entity [Axis] Legal Entity [Axis] Total assets Assets Fiscal 2027 Finite-Lived Intangible Asset, Expected Amortization, Year One Trading Symbol Trading Symbol Entity Address, City or Town Entity Address, City or Town Cash Flows From Operating Activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Basis of Presentation & Description of Business Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Weighted Average Amortization Period Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Schedule of intangible assets acquired and assumptions utilized in the valuation Business Combination, Intangible Asset, Acquired, Finite-Lived [Table Text Block] Fiscal 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Four Other liabilities, current and non-current Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities Entity Emerging Growth Company Entity Emerging Growth Company Fiscal 2029 Long-Term Debt, Maturity, Year Three Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Tax benefit arrangement payable, current Tax Benefit Arrangement Payable Current Tax Benefit Arrangement Payable Current Level 2 Fair Value, Inputs, Level 2 [Member] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Common stock, outstanding (in shares) Common Stock, Shares, Outstanding PEO PEO [Member] Schedule of net sales disaggregated by product category Disaggregation of Revenue [Table Text Block] Debt instrument, SOFR floor Debt Instrument, SOFR Floor Debt Instrument, SOFR Floor Internal Use Software Internal Use Software [Member] Internal Use Software Weighted Average Discount Rate Acquired Finite-Lived Intangible Assets, Valuation Assumption, Discount Rate, Percentage Acquired Finite-Lived Intangible Assets, Valuation Assumption, Discount Rate, Percentage Estimated deferred tax asset target per agreement Tax Receivable Agreements, Estimated Deferred Tax Asset Target Per Agreement Tax Receivable Agreements, Estimated Deferred Tax Asset Target Per Agreement Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Fair value of this cash flow interest rate swap liability Cash Flow Hedge Derivative Instrument Liabilities at Fair Value Schedule of estimated aggregate amortization expense on intangible assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Retained Earnings Retained Earnings [Member] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Aggregate future debt payments Maturities of Long-Term Debt [Abstract] Effective fixed rate (percent) Debt Instrument, Interest Rate, Effective Percentage Schedule of accrued compensation and benefits Schedule of Accrued Liabilities [Table Text Block] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Cash and cash equivalents at the beginning of the period Cash and cash equivalents at the end of the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Provision for income taxes Income Tax Expense (Benefit) Applicable margin (percent) Debt Instrument, Basis Spread on Variable Rate Class B Common Stock Common Class B [Member] Tax expense Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value 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and Liability Assumed [Table Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Borrowings on asset-based revolving credit facility Proceeds from Long-Term Lines of Credit Cash Flows From Investing Activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Related Party Transactions [Abstract] Amortization expense related to intangible assets: Amortization [Abstract] Cash flow Cash Flow Hedging [Member] Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Schedule of cash and non-cash impacts associated with leases Lease, Cost [Table Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Depreciation Depreciation Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Fiscal 2026 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Weighted Average Attrition Rate Acquired Finite-Lived Intangible Assets, Valuation Assumption, Attrition Rate, Percentage Acquired Finite-Lived Intangible Assets, Valuation Assumption, Attrition Rate, Percentage Storm drainage products Storm Drainage Products [Member] Storm Drainage Products Equity Components [Axis] Equity Components [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Inventories Business Combination, Recognized Asset Acquired, Inventory, Current Base Rate Component, Addition To Prime, SOFR, Federal Funds Rate Base Rate Component, Addition To Prime, SOFR, Federal Funds Rate [Member] Base Rate Component, Addition To Prime, SOFR, Federal Funds Rate Receivables Business Combination, Recognized Asset Acquired, Receivable, Current Accumulated Impairment Goodwill, Impaired, Accumulated Impairment Loss Other Performance Measure, Amount Other Performance Measure, Amount Payment of contingent consideration Payments of Debt Issuance Costs Entity Address, State or Province Entity Address, State or Province Related Party [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Derivative Instrument [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] Accounting Changes and Error Corrections [Abstract] Entities [Table] Entities [Table] Entity [Domain] Entity [Domain] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Allowance for credit losses Accounts and Financing Receivable, Allowance for Credit Loss Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Cash paid for interest (excluding effects of interest rate swap) Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation - Accounting Basis of Accounting, Policy [Policy Text Block] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Effective tax rate (percent) Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Other compensation and benefits Other Employee-related Liabilities, Current Mark R. Witkowski [Member] Mark R. Witkowski Tax receivable agreement liabilities Tax Benefit Arrangement Payable Noncurrent Tax Benefit Arrangement Payable Noncurrent Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Ownership [Domain] Ownership [Domain] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Contingent consideration liability Business Combination, Contingent Consideration, Liability Amortization expense Amortization of Intangible Assets Selling, general and administrative Selling, General and Administrative Expense Deferred Income Tax Assets, Net Deferred Income Tax Assets, Net Capital expenditures Payments to Acquire Productive Assets Depreciation and amortization Depreciation, Depletion and Amortization Other assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Schedule of aggregate future debt payments Schedule of Maturities of Long-Term Debt [Table Text Block] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Activity under equity-based compensation plans, net of tax withholdings Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Value, Period Increase (Decrease) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Value, Period Increase (Decrease) Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving credit facility Revolving Credit Facility [Member] Arrangement Duration Trading Arrangement Duration Federal funds rate, base rate Base Rate Component, Federal Funds Rate [Member] Base Rate Component, Federal Funds Rate Establishment of tax receivable agreement liabilities Adjustments To Additional Paid In Capital, Tax Receivable Agreement Adjustments To Additional Paid In Capital, Tax Receivable Agreement Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Former Limited Partners Limited Partner [Member] Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Closing stock price (in dollars per share) Share Price Other Payment for (Proceeds from) Other Investing Activity Repurchase and Retirement of Class A and Class B shares and corresponding Partnership Interest (in shares) Stock repurchased and retired (in shares) Stock Repurchased and Retired During Period, Shares Other assets, current and non-current Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets Intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Cash Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent ASSETS Assets [Abstract] Long-term debt Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Fiscal 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Three Debt Instrument [Axis] Debt Instrument [Axis] Activity under equity-based compensation plans, net of tax withholdings (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease) Business Combination [Line Items] Business Combination [Line Items] Credit Facility [Domain] Credit Facility [Domain] Gross Intangible Finite-Lived Intangible Assets, Gross Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Non-current operating lease liabilities Operating Lease, Liability, Noncurrent Percent of Company realized tax benefits payable to Limited Partners pursuant to Tax Receivable Agreements Tax Receivable Agreements, Payment To Limited Partners Of Realized Company Tax Benefits, Percent Tax Receivable Agreements, Payment To Limited Partners Of Realized Company Tax Benefits, Percent Canada Waterworks Canada Waterworks [Member] Canada Waterworks Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Ownership [Axis] Ownership [Axis] Fair Value as of Grant Date Award Grant Date Fair Value Reclassification of income to interest expense Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Entity Registrant Name Entity Registrant Name Cash flow hedge gain (loss) to be reclassified within 12 months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Depreciation expense related to property and equipment, including capitalized software Depreciation [Abstract] Schedule of debt Schedule of Long-Term Debt Instruments [Table Text Block] Increase to net income attributable to dilutive instruments Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities Document Quarterly Report Document Quarterly Report Fair value of debt Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Fire protection products Fire Protection Products [Member] Fire Protection Products Operating cash flow payments for operating lease liabilities Operating Lease, Payments, Measurements Of Lease Liabilities Operating Lease, Payments, Measurements Of Lease Liabilities Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Interest Rate Swap Maturing July 27, 2026 Interest Rate Swap, Two [Member] Interest Rate Swap, Two Senior ABL Credit Facility due April 2031 Senior ABL Credit Facility Due July 2026 [Member] Senior ABL Credit Facility Due July 2026 Related Party [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Number of branch locations Number of Stores Schedule of net intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Repayments on asset-based revolving credit facility Repayments of Long-Term Lines of Credit Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Other Proceeds from (Payment for) Other Financing Activity Smart utility products Meter Products [Member] Meter Products Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Notional amount Derivative Liability, Notional Amount Other intangible assets Other Intangible Assets [Member] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Measurement adjustment gain (loss) for interest rate swap Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Non-controlling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Other Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Operating lease liabilities, current and non-current Business Combination, Recognized Liability Assumed, Lease Obligation Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Aggregate principal amount Debt Instrument, Face Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Accumulated Other Comprehensive (Loss) Income AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Equity-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Accumulated other comprehensive (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Gross Goodwill Goodwill, Gross Fiscal 2027 Long-Term Debt, Maturity, Year One Accumulated Other Comprehensive (Loss) Income AOCI Including Portion Attributable to Noncontrolling Interest [Member] Schedule of interest rate swap impact on accumulated other comprehensive loss Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] (Increase) decrease in inventories Increase (Decrease) in Inventories Inventories Inventory, Net Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Share issuances under equity-based compensation plans, net of tax withholdings (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Shares, Period Increase (Decrease) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Shares, Period Increase (Decrease) Minimum Minimum [Member] Company Selected Measure Name Company Selected Measure Name Schedule of amortization expense related to intangible assets Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Net income available to common shareholders - diluted Net Income (Loss) Available to Common Stockholders, Diluted All Executive Categories All Executive Categories [Member] Repayments of long-term debt Repayments of Senior Debt Common stock Common Stock, Value, Issued Goodwill changes: Goodwill [Roll Forward] Estimated prospective aggregate amortization expense: Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] Diluted (shares) Weighted average shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Segments Segment Reporting, Policy [Policy Text Block] Commitments and contingencies Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Business Combination [Axis] Business Combination [Axis] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Term loan Loans Payable [Member] Entity Small Business Entity Small Business Number of branch locations acquired Business Combination, Number Of Branch Locations Acquired Business Combination, Number Of Branch Locations Acquired Base Rate Component, SOFR Base Rate Component, SOFR [Member] Base Rate Component, SOFR Income Tax Disclosure [Abstract] Non-Controlling Interests Noncontrolling Interest [Member] Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding Document Transition Report Document Transition Report Pipes, valves & fittings products Pipes, Valves, And Fitting Products [Member] Pipes, Valves, And Fitting Products Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Underlying Securities Award Underlying Securities Amount Senior Term Loan due July 2028 Senior Term Loan Due July 2028 [Member] Senior Term Loan Due July 2028 Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Deferred consideration Business Combination, Contingency Deferred at Acquisition Date, Liability Assumed, Fair Value Business Combination, Contingency Deferred at Acquisition Date, Liability Assumed, Fair Value Income Taxes Income Tax Disclosure [Text Block] Diluted earnings per share: Earnings Per Share, Diluted [Abstract] Class A Common Stock Common Class A [Member] Estimated tax liability per agreement Tax Receivable Agreements, Estimated Tax Liability Per Agreement Tax Receivable Agreements, Estimated Tax Liability Per Agreement Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Total Receivables, net Receivables, Net, Current [Abstract] Scenario [Axis] Scenario [Axis] Total assets acquired Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Assets Acquired Including Goodwill Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Assets Acquired Including Goodwill Total stockholders’ equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Document Type Document Type Basic and Diluted Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Reclassification of income to interest expense Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Derivative Contract [Domain] Derivative Contract [Domain] Business Combination, Intangible Asset, Acquired, Finite-Lived [Table] Business Combination, Intangible Asset, Acquired, Finite-Lived [Table] Net sales Total net sales Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] (Increase) decrease in receivables Increase (Decrease) in Receivables Name Forgone Recovery, Individual Name Total current assets Assets, Current Intangible Asset Amount Finite-Lived Intangible Assets Acquired Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Fee on unfunded commitments (percent) Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Authorized, share repurchase amount Share Repurchase Program, Authorized, Amount Fixed interest rate (percent) Derivative, Fixed Interest Rate Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net income available to Class A common stock Net income available to common shareholders - basic Net Income (Loss) Available to Common Stockholders, Basic Entity Information [Line Items] Entity Information [Line Items] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Current liabilities: Liabilities, Current [Abstract] Total operating expenses Operating Expenses Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Amount outstanding Long-Term Line of Credit Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Accounts payable Business Combination, Recognized Liability Assumed, Accounts Payable, Current Increase (decrease) in accrued liabilities Increase (Decrease) in Accrued Liabilities Diluted (in dollars per share) Net income per share - diluted (in dollars per share) Earnings Per Share, Diluted Forecast Forecast [Member] Accrued Compensation and Benefits Employee-related Liabilities, Current [Abstract] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Trade receivables, net of allowance for credit losses Accounts Receivable, after Allowance for Credit Loss, Current Title of 12(b) Security Title of 12(b) Security Earnings per share: Earnings Per Share [Abstract] Contingent consideration EBITDA target period Business Acquisition, Contingent Consideration EBITDA Target Period Business Acquisition, Contingent Consideration EBITDA Target Period Establishment/adjustment of deferred tax asset associated with Core & Main investment in Core & Main Holdings, LP Adjustments To Additional Paid In Capital, Deferred Tax Liability Adjustment Adjustments To Additional Paid In Capital, Deferred Tax Liability Adjustment Gross profit Gross Profit Repurchase and retirement of equity interests Stock repurchased and retired during period, value Stock Repurchased and Retired During Period, Value Estimated increase in deferred tax liability due to exchange of Partnership Interests Deferred Tax Liability, Estimated Increase Due To Exchange Of Partnership Interests Deferred Tax Liability, Estimated Increase Due To Exchange Of Partnership Interests Noncontrolling Interest [Abstract] Fiscal 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Two Continuing Limited Partners Continuing Limited Partners [Member] Continuing Limited Partners Award Timing Disclosures [Line Items] Debt covenant, consolidated fixed charge coverage ratio Debt Instrument, Covenant, Consolidated Fixed Charge Coverage Ratio, Minimum Debt Instrument, Covenant, Consolidated Fixed Charge Coverage Ratio, Minimum Long-term Debt Long-Term Debt, Gross Accrued compensation and benefits Accrued compensation and benefits Employee-related Liabilities, Current Tax (expense) benefit on interest rate swap adjustments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract] Distributions to non-controlling interest holders Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Fiscal Year Fiscal Period, Policy [Policy Text Block] Net income attributable to Core & Main, Inc. Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Contingent consideration Business Combination, Contingency Recognized at Acquisition Date, Liability Assumed, Fair Value Property, plant and equipment, net Property, Plant and Equipment, Net Repurchase and retirement of equity interests Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Alternate base rate Base Rate [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Supplier rebate receivables Supplier Rebate Receivable, Current Supplier Rebate Receivable, Current Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Customer relationships Customer Relationships [Member] Operating income Operating Income (Loss) Retained earnings Retained Earnings (Accumulated Deficit) Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Non-controlling interests (percent) Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Interest expense Interest Expense, Operating and Nonoperating Current Fiscal Year End Date Current Fiscal Year End Date Class of Stock [Axis] Class of Stock [Axis] Periodic payment as a percentage of original principal Debt Instrument, Periodic Payment, Principal, Percent Debt Instrument, Periodic Payment, Principal, Percent Intangible assets, net: Finite-Lived Intangible Assets, Net [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Schedule of receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Statement [Table] Statement [Table] Adjustments to reconcile net cash from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash Flows From Financing Activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Current maturities of long-term debt, Principal Long-Term Debt, Gross, Current Maturities Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Hedged borrowings Hedged Debt Hedged Debt Non-controlling Interests Noncontrolling Interest Disclosure [Text Block] Receivables, net of allowance for credit losses of $25 and $22, respectively Receivables, net of allowance for credit losses Receivables, Net, Current Variable Rate [Domain] Variable Rate [Domain] Net assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Fiscal 2028 Long-Term Debt, Maturity, Year Two Tax receivable arrangement Tax Benefit Arrangement Payable Tax Benefit Arrangement Payable Termination Date Trading Arrangement Termination Date Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Accrued bonuses and commissions Accrued Bonuses And Commissions, Current Accrued Bonuses And Commissions, Current Foreign currency translation and other Goodwill, Foreign Currency Translation and Measurement Period Adjustments Basic (shares) Weighted average shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock repurchase program, remaining authorized, amount Share Repurchase Program, Remaining Authorized, Amount Cost of sales Cost of Product and Service Sold Schedule of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt covenant, threshold percentage of borrowing base or aggregate effective commitments for fixed charge coverage ratio Debt Instrument, Covenant, Threshold Percentage Of Borrowing Base Or Commitments For Fixed Charge Coverage Debt Instrument, Covenant, Threshold Percentage Of Borrowing Base Or Commitments For Fixed Charge Coverage Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Pioneer Supply Pioneer Supply [Member] Pioneer Supply Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Scenario [Domain] Scenario [Domain] Accumulated other comprehensive loss, cash flow hedge Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, issued (in shares) Common Stock, Shares, Issued Senior Term Loan Due February 2031 Senior Term Loan Due February 2031 [Member] Senior Term Loan Due February 2031 Fiscal 2030 Long-Term Debt, Maturity, Year Four Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Payments pursuant to Tax Receivable Agreements Payments pursuant to Tax Receivable Agreements Payments pursuant to Tax Receivable Agreements Fiscal 2025 Acquisitions Fiscal 2025 Acquisitions [Member] Fiscal 2025 Acquisitions Estimates Use of Estimates, Policy [Policy Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Operating cash flow payments for non-lease components Operating Lease, Payments, Other Lease Components Operating Lease, Payments, Other Lease Components Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Goodwill: Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Fiscal 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Total liabilities Liabilities Preferred dividends Dividends, Preferred Stock Aggregate commitments Line of Credit Facility, Maximum Borrowing Capacity Allocation of transaction price Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Operating expenses: Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Other Liabilities, Current Statement [Line Items] Statement [Line Items] Variable Rate [Axis] Variable Rate [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Deferred income tax expense Increase (Decrease) in Deferred Income Taxes Common Stock Common Stock [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Decrease in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Incremental shares of common stock attributable to dilutive instruments (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment