Less accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Temporary equity Temporary Equity [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Related Party Transaction [Axis] Related Party Transaction [Axis] Remainder of 2025 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Entity File Number Entity File Number Additional Paid-In Capital Additional Paid-in Capital [Member] IPO IPO [Member] Tabular List, Table Tabular List [Table Text Block] Leases [Abstract] Trade receivables Tenant Improvement Allowance Receivables [Member] Tenant Improvement Allowance Receivables Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Accounts payable Increase (Decrease) in Accounts Payable Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Interest expense, net Interest expense, net 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Amount Concentration risk (as a percent) Concentration Risk, Percentage Other assets Increase (Decrease) in Other Operating Assets Principles of Consolidation Consolidation, Policy [Policy Text Block] Equity-based compensation Share-Based Payment Arrangement, Noncash Expense Options Stock options Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total shareholders' equity attributable to Black Rock Coffee Bar, Inc./members' deficit Equity, Attributable to Parent Insider Trading Policies and Procedures [Line Items] Selling, general and administrative expenses Share-Based Payment Arrangement, Expense Overnight Rate Federal Reserve’s Bank of New York Overnight Rate [Member] Federal Reserve’s Bank of New York Overnight Rate Schedule of Components of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Goodwill and Intangible Assets Disclosure [Abstract] Issuance of Class A common stock sold in initial public offering, net of offering costs (in shares) Stock Issued During Period, Shares, New Issues Current assets: Assets, Current [Abstract] Total liabilities, temporary equity and shareholders' equity/members' deficit Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Interest rate Line of Credit Facility, Interest Rate at Period End Stock Options Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] LIABILITIES, TEMPORARY EQUITY AND SHAREHOLDERS' EQUITY/MEMBERS' DEFICIT Liabilities and Equity [Abstract] Unpaid offering costs Accrued Offering Costs Accrued Offering Costs Cover [Abstract] Common units, outstanding (in shares) Common Unit, Outstanding Maximum Maximum [Member] Intangible assets amortization period Finite-Lived Intangible Asset, Useful Life Purchase of LLC Units and unitholder contribution in connection with the initial public offering (in shares) Stock Issued During Period, Shares, Purchase Of Units Stock Issued During Period, Shares, Purchase Of Units Less: net loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Accounting Policies [Abstract] Common stock to LLC unit ratio Common Stock To LLC Unit Ratio Common Stock To LLC Unit Ratio Total intangible assets, net Finite-Lived Intangible Assets, Net Schedule of Future Minimum Lease Payments for Operating Leases Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Total operating lease liabilities Operating Lease, Liability Continuing Equity Owners Continuing Equity Owners [Member] Continuing Equity Owners Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Affiliate Of Co-Founders Affiliate Of Co-Founders [Member] Affiliate Of Co-Founders Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Temporary equity, unitholder contributions Temporary Equity, Partners Capital Account Contributions Temporary Equity, Partners Capital Account Contributions Purchase of noncontrolling interest position Payments for Repurchase of Redeemable Noncontrolling Interest Statement of Cash Flows [Abstract] Current portion of long-term debt Less current portion Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Obligated fixed fronting fee Line of Credit Facility, Fixed Fronting Fee Line of Credit Facility, Fixed Fronting Fee Name Measure Name Weighted average ownership percentage Noncontrolling Interest, Ownership Percentage By Noncontrolling Owners, Weighted Average Noncontrolling Interest, Ownership Percentage By Noncontrolling Owners, Weighted Average Adjusted Term SOFR Rate One Month Adjusted Term Secured Overnight Financing Rate [Member] One Month Adjusted Term Secured Overnight Financing Rate Schedule of Equity-Based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Term loan Secured Debt [Member] Current portion of operating lease liabilities Less current portion Operating Lease, Liability, Current Class of Stock [Line Items] Class of Stock [Line Items] Remainder of 2025 Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Remainder Of Fiscal Year Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Remainder Of Fiscal Year Document Fiscal Period Focus Document Fiscal Period Focus Temporary equity, units authorized (in shares) Temporary Equity, Shares Authorized Award Timing Method Award Timing Method [Text Block] Furniture and fixtures Furniture and Fixtures [Member] Award Type Award Type [Axis] Total Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Total assets Assets Equity-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Less: net loss attributable to Black Rock OpCo prior to the Transactions Net Income (Loss) Attributable to Parent, Prior To Transactions Net Income (Loss) Attributable to Parent, Prior To Transactions Major Supplier Three Three Major Suppliers [Member] Three Major Suppliers LLC Units Member Units [Member] Income Taxes Income Tax, Policy [Policy Text Block] Forgiveness of Related Party Note Receivable Forgiveness of Related Party Note Receivable Forgiveness of Related Party Note Receivable 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] Receivable Type [Axis] Receivable Type [Axis] Intangible Assets Intangible Assets Disclosure [Text Block] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Unitholder contributions Proceeds from Partnership Contribution RSUs Restricted Stock Units (RSUs) [Member] Unitholder distributions Partners' Capital Account, Distributions Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Vesting period four Share-Based Payment Arrangement, Tranche Four [Member] Share-Based Payment Arrangement, Tranche Four Entity Emerging Growth Company Entity Emerging Growth Company 2028 Long-Term Debt, Maturity, Year Three Purchase of intangible assets Payments to Acquire Intangible Assets Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Operating lease right-of use-assets obtained in exchange for lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Outstanding, beginning balance (in shares) Outstanding, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Principal payment Repayments of Lines of Credit 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] Less debt issuance costs Debt Issuance Costs, Net Less capitalized modification fees Debt Instrument, Unamortized Capitalized Modification Fees Debt Instrument, Unamortized Capitalized Modification Fees Temporary equity par value (in dollars per share) Temporary Equity, Par or Stated Value Per Share Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Related Party Related Party [Member] Class C Common stock Common Class C [Member] Unitholder distributions Payments of Distributions to Affiliates Common stock, shares, outstanding (in shares) Shares outstanding (in shares) Common Stock, Shares, Outstanding CEO Chief Executive Officer [Member] Document Information [Table] Document Information [Table] PEO PEO [Member] Suppliers Cost of Goods and Service, Product and Service Benchmark [Member] Schedule For Revenue Recognition Disaggregation of Revenue [Table Text Block] Interest income Investment Income, Interest Supplemental disclosure of noncash investing and financing activities: Noncash Investing and Financing Items [Abstract] Changes in operating 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] Nature of Operation, Product Information, Concentration of Risk [Table] Nature of Operation, Product Information, Concentration of Risk [Table] Volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Accumulated Deficit Retained Earnings [Member] Number of RSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Share-Based Payment Arrangement [Abstract] Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Adjusted Term Secured Overnight Financing Rate Spread Adjusted Term Secured Overnight Financing Rate Spread [Member] Adjusted Term Secured Overnight Financing Rate Spread Income tax expense Income Tax Expense (Benefit) Noncontrolling interest Members' Equity Attributable to Noncontrolling Interest Variable rate Debt Instrument, Basis Spread on Variable Rate Class B Common stock Common Class B [Member] Sale of Stock [Domain] Sale of Stock [Domain] Document Information [Line Items] Document Information [Line Items] Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Common stock units subject to time based requirements (in shares) Partners' Capital Account, Restricted Units Partners' Capital Account, Restricted Units Product and Service [Domain] Product and Service [Domain] Revenue recognized - card and rewards redemptions and breakage Contract with Customer, Liability, Revenue Recognized, Including Opening Balance Contract with Customer, Liability, Revenue Recognized, Including Opening Balance Interest expense Interest Expense, Debt, Excluding Amortization Property and equipment, gross Property, Plant and Equipment, Gross Members’ Deficit Parent [Member] Net loss Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Note payable to RCS SBIC Fund II, L.P and TCW Asset Management Company, LLC Notes Payable, Other Payables [Member] Beverage, food and packaging costs Cost, Direct Material Non-cash operating lease costs Operating Lease, Right-of-Use Asset, Periodic Reduction Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Purchase of LLC Units from Continuing Equity Owners Purchase Of Member Units Purchase Of Member Units City Area Code City Area Code Series A-1 Series A-1 [Member] Series A-1 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] Accrued expenses Accrued Liabilities, Current Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Schedule of Company Gift Card and Loyalty Program Liability Activity Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] 2029 Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, In Year Four Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, In Year Four Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Unrecognized compensation Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Reacquired franchise rights Franchise Rights [Member] Supplier [Axis] Supplier [Axis] Temporary equity, redemption discount on Series A Preferred Units Temporary Equity, Preferred Units Redemption Discount Temporary Equity, Preferred Units Redemption Discount Related Party Transactions [Abstract] Deferred offering costs not yet paid Deferred Offering Costs Incurred But Not Yet Paid Deferred Offering Costs Incurred But Not Yet Paid Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Estimated Useful Lives Property, Plant and Equipment, Useful Life Preferred stock, par value (in dollars per share) Preferred stock, par value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share Schedule of Fair Value Assumptions Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] Total lease cost Lease, Cost Deferred Income [Roll Forward] Deferred Income [Roll Forward] Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Schedule of Components of Net Lease Costs Lease, Cost [Table Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation expense Depreciation Equity Components [Axis] Equity Components [Axis] Entity Ex Transition Period Entity Ex Transition Period Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Less sublease income Sublease Income Deferred Offering Costs Deferred Offering Costs [Policy Text Block] Deferred Offering Costs Series A Series A [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Trade receivables Trade Accounts Receivable [Member] Store operating costs and expenses (exclusive of depreciation and amortization presented separately below): Operating Costs and Expenses [Abstract] Number of reportable segments Number of Reportable Segments Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Advertising Expense Advertising Cost [Policy Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Weighted-Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Payments of debt issuance costs and loan fees Payments of Debt Issuance Costs Entity Address, State or Province Entity Address, State or Province Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Effect of the reorganization transactions Temporary Equity, Elimination as Part of Reorganization Total current liabilities Liabilities, Current Over-Allotment Option Over-Allotment Option [Member] Individual: Individual [Axis] Too Sweet Cakes, LLC Too Sweet Cakes, LLC Purchases [Member] Too Sweet Cakes, LLC Purchases Vesting [Axis] Vesting [Axis] Entity [Domain] Entity [Domain] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation 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 during the year for interest, net of capitalized interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating lease right-of-use assets, net Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Ownership (as a percent) Subsidiary, Ownership Percentage, Noncontrolling Owner Payments on long-term debt Repayments of Long-Term Debt Effective tax rate Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Operating lease cost Operating Lease, Cost Recognition period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Equity [Abstract] Buildings Building [Member] Less: Segment Reconciliation [Abstract] Schedule of Ownership Interest Schedule of Other Ownership Interests [Table Text Block] Segment Reporting Segment Reporting Disclosure [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Purchase fees Shares Acquired, Fees Shares Acquired, Fees Reportable Segment Reportable Segment [Member] Reportable Segment Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] 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] Series A-2 Series A-2 [Member] Series A-2 Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Outstanding preferred units (in shares) Share Repurchase Program, Authorized, Number of Shares Amortization of intangible assets Amortization of Intangible Assets Selling, general and administrative expenses Selling, General and Administrative Expense Deferred income tax asset Deferred Income Tax Assets, Net Depreciation and amortization Depreciation, Depletion and Amortization Schedule of Unrecognized Equity-Based Compensation Share-Based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Other assets Other Assets, Noncurrent Note receivable from related party Note receivable and carrying value Financing Receivable, after Allowance for Credit Loss, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Schedule of Future Principal Maturities of Long-term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Net proceeds from IPO Sale of Stock, Consideration Received on Transaction Payments for redemption of outstanding Series A units Payments for Repurchase of Equity 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] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolving Credit Facility [Member] Debt issuance costs and capitalized modification fees Deferred Debt Issuance Cost, Writeoff Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Vesting period one Share-Based Payment Arrangement, Tranche One [Member] Share ownership threshold Common Stock, Votes Per Share, Ownership Threshold Common Stock, Votes Per Share, Ownership Threshold Gift card and loyalty program liability Contract with Customer, Liability, Current Number of votes per share Number Of Votes Per Share Number Of Votes Per Share Segments [Axis] Segments [Axis] Prepaid expenses and deposits Increase (Decrease) in Prepaid Expense and Other Assets Total temporary equity Temporary equity, beginning balance Temporary equity, ending balance Temporary Equity, Carrying Amount, Attributable to Parent Recapitalized ownership Partners' Capital Account, Units, Converted Other Other Inventory, Net of Reserves Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Equity-Based Compensation Share-Based Payment Arrangement [Text Block] Pre-opening costs Pre-Opening Costs Temporary equity, unitholder distributions Temporary Equity, Partners' Capital Account, Distributions Temporary Equity, Partners' Capital Account, Distributions ASSETS Assets [Abstract] Long-term debt, net of current portion Total 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 Note receivable Financing Receivable, before Allowance for Credit Loss Vesting [Domain] Vesting [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Credit Facility [Domain] Credit Facility [Domain] Intangible assets, gross Finite-Lived Intangible Assets, Gross Shareholders equity/members' deficit Equity, Attributable to Parent [Abstract] 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] Vesting percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Number of states Number of States in which Entity Operates Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Shares purchased Treasury Stock, Value, Acquired, Cost Method Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Reconciliation of profit or loss Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract] Ownership [Axis] Ownership [Axis] Series A Preferred Units Preferred Stock [Text Block] Schedule of Stock by Class Schedule of Stock by Class [Table Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Registrant Name Entity Registrant Name Temporary equity, units outstanding (in shares) Temporary Equity, Shares Outstanding Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Revenue deferred - card activations and rewards earned Contract With Customer, Liability, Revenue Deferred Contract With Customer, Liability, Revenue Deferred Schedule of Long-Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Labor and related expenses Labor and Related Expense The Credit Facility The Credit Facility [Member] The Credit Facility Granted (in shares) Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Title and Position [Domain] Title and Position [Domain] Total operating expenses Costs and Expenses Total unrecognized equity-based compensation Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Document Quarterly Report Stock issued, issuance costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Voting Percentage Common Stock, Voting Percentage Common Stock, Voting Percentage Counterparty Name [Domain] Counterparty Name [Domain] Viking Cake BR, LLC Viking Cake BR, LLC Note Receivable [Member] Viking Cake BR, LLC Note Receivable Number of operating segments Number of Operating Segments 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Outstanding, ending balance, Weighted Average Remaining Contractual Term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Manufacturing equipment Machinery and Equipment [Member] Adjustments and reconciling items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Granted (in usd 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 Related and Nonrelated Parties [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 Stores Number of Stores Major Supplier Two Two Major Suppliers [Member] Two Major Suppliers Schedule of Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Aggregate Intrinsic Value (in thousands) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Total shareholders' equity attributable to Black Rock Coffee Bar, Inc./members' deficit Members' Equity Sale of Stock [Axis] Sale of Stock [Axis] Other intangible assets Other Intangible Assets [Member] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Noncontrolling interest Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Leasehold improvements Leasehold Improvements [Member] Advertising expense Advertising Expense Tax receivable agreement liability Tax Receivable Agreement Liability, Noncurrent Tax Receivable Agreement Liability, Noncurrent Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Purchase of noncontrolled ownership interest Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Previous Credit Facility Previous Credit Facility [Member] Previous Credit Facility Compensation Amount Outstanding Recovery Compensation Amount Debt amount Debt Instrument, Face Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Accrued payroll and benefits Increase (Decrease) in Employee Related Liabilities Deemed distribution for Series A-1 and Series A-2 Preferred Units Temporary Equity, Accretion of Dividends MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Beginning balance (in usd per share) Ending balance (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value SOFR spread Secured Overnight Financing Rate (SOFR), Spread [Member] Secured Overnight Financing Rate (SOFR), Spread Weighted-average shares of Class A common stock outstanding Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Equity-based compensation recognized subsequent to the Transactions APIC, Share-Based Payment Arrangement, Increase for Cost Recognition 2026 Long-Term Debt, Maturity, Year One Segments [Domain] Segments [Domain] 2030 Long-Term Debt, Maturity, Year Five Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Inventories Increase (Decrease) in Inventories OpCo Units Capital Units, Outstanding Inventories Inventories Inventory, Net Amortization of debt issuance costs and loan fees Amortization of debt issuance costs and capitalized modification fees Amortization of Debt Issuance Costs and Discounts Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net Loss Per Share Earnings Per Share, Policy [Policy Text Block] Noncontrolling Interest Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Company Selected Measure Name Company Selected Measure Name Schedule of Amortization Expense Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Preferred stock, par value $0.00001 per share; 20,000,000 shares authorized, no shares issued or outstanding as of September 30, 2025 Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Cash paid for amounts included in the measurement of operating lease liabilities Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Percentage of number of shares outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Annual Percentage Increase Share-Based Compensation Arrangement by Share-Based Payment Award, Annual Percentage Increase Tax Receivable Agreement Tax Receivable Agreement [Policy Text Block] Tax Receivable Agreement All Executive Categories All Executive Categories [Member] Common stock, value, issued Common Stock, Value, Issued Black Rock OpCo Black Rock OpCo [Member] Black Rock OpCo Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Vesting period two Share-Based Payment Arrangement, Tranche Two [Member] Title and Position [Axis] Title and Position [Axis] Diluted (in shares) Weighted-average number of shares of Class A common stock outstanding used to calculated diluted net loss per share Weighted Average Number of Shares Outstanding, Diluted Commitments and Contingencies (Note 15) 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