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Excluded EPS Calculation [Table] Intangible assets amortization period Intangible Asset, Finite-Lived, Useful Life Too Sweet Cakes, LLC Too Sweet Cakes, LLC Purchases [Member] Too Sweet Cakes, LLC Purchases Sale of stock (in shares) Sale of Stock, Number of Shares Issued in Transaction Nature of Operation, Product Information, Concentration of Risk [Table] Nature of Operation, Product Information, Concentration of Risk [Table] Schedule of RSU Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Exercise Price Award Exercise Price Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Related Party Transaction [Axis] Related Party Transaction [Axis] Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested 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Fiscal Year Unitholder distributions Temporary Equity, Partners' Capital Account, Distributions Temporary Equity, Partners' Capital Account, Distributions Income Statement [Abstract] Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Change from net income attributable to Black Rock Coffee Bar, Inc. and transfers from noncontrolling interest Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net Deferred income tax asset Deferred Income Tax Assets, Net Schedule of Components of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Schedule of Intangible Assets Intangible Asset, Finite-Lived [Table Text Block] Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions Schedule of Share-Based Payment Award, Stock Options, 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[Abstract] Proceeds from long-term debt Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Increase in additional paid-in capital as a result of common stock issuances pursuant to vesting of equity awards Consolidation, Less Than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance Of Interest By Parent Consolidation, Less Than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance Of Interest By Parent Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Registrant Name Entity Registrant Name Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Prepaid expenses and deposits Prepaid Expenses And Deposits, Current Prepaid Expenses And Deposits, Current Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and Contingencies (Note 13) Commitments and Contingencies Intangible assets, gross Intangible Asset, Finite-Lived, before Accumulated Amortization Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Property and equipment, gross Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] TRA liability due to exchanges of LLC units Increase (Decrease) In Tax Receivable Agreement Liability Increase (Decrease) In Tax Receivable Agreement Liability Manufacturing equipment Machinery and Equipment [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Receivable Type [Axis] Receivable Type [Axis] Merchandise and supplies Inventory, Supplies, Net of Reserves Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Furniture and fixtures Furniture and Fixtures [Member] Counterparty Name [Axis] Counterparty Name [Axis] Store operating costs and expenses (exclusive of depreciation and amortization presented separately below): Operating Costs and Expenses [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Temporary equity, beginning balance Temporary equity, ending balance Temporary Equity, Carrying Amount, Attributable to Parent Inventories Inventories Inventory, Net All Award Types Award Type [Domain] Federal Funds Rate Federal Funds Rate [Member] Federal Funds Rate Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Remainder of 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Expected term (years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Operating lease initial terms Lessee, Operating Lease, Term of Contract Ownership (as a percent) Subsidiary, Ownership Percentage, Noncontrolling Owner PEO Name PEO Name Alternate Base Rate (ABR) Alternate Base Rate (ABR) [Member] Alternate Base Rate (ABR) Leasehold improvements Leasehold Improvements [Member] Payments for redemption of outstanding Series A units Payments for Repurchase of Equity Beginning balance Ending balance Contract with Customer, Liability Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Finance obligations Finance Obligations Finance Obligations Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Term Benchmark Rate Term Benchmark Rate [Member] Term Benchmark Rate Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] 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 Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Accounts payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Organization and Nature of Operations Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Equity-based compensation Share-Based Payment Arrangement, Noncash Expense Labor and related expenses Labor and related expenses Labor and Related Expense Total lease cost Lease, Cost Interest income from related party Interest Income (Expense), Related Party Interest Income (Expense), Related Party Schedule of Components of Inventories Schedule of Inventory, Current [Table Text Block] Leases Lessee, Operating Leases [Text Block] 2027 Long-Term Debt, Maturity, Year One Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Basic net income per share attributable to Class A common shareholders (in dollars per share) Earnings Per Share, Basic Gift card and loyalty program liability Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Long-term debt, net of current portion Total long-term debt Long-Term Debt, Excluding Current Maturities Award Type Award Type [Axis] Number of votes per share Common Stock, Votes Per Share Common Stock, Votes Per Share Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Receivables Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings (Accumulated deficit) Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] 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] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Operating lease cost Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Noncontrolling Interest [Abstract] Maximum net rent adjusted leverage ratio Debt Instrument, Covenant, Maximum Net Rent Adjusted Leverage Ratio Debt Instrument, Covenant, Maximum Net Rent Adjusted Leverage Ratio Interest expense Interest Expense, Debt, Excluding Amortization Concentration risk (as a percent) Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Equity Awards Adjustments Equity Awards Adjustments [Member] LLC Units (in shares) Capital Units, Outstanding LLC Units held by Black Rock Coffee Bar, Inc. Black Rock Coffee Bar, Inc [Member] Black Rock Coffee Bar, Inc Total liabilities and shareholders' equity Liabilities and Equity Variable lease cost Variable Lease, Cost Deferred tax asset Deferred Tax Assets, Net Options Stock options Share-Based Payment Arrangement, Option [Member] Noncontrolling interest Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Schedule of Components of Receivables Net and Inventories Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Additional paid-in capital Additional Paid in Capital Purchase of intangible assets Payments to Acquire Intangible Assets Other income (expense), net Other expense (income), net Other Nonoperating Income (Expense) Long-Term Debt Long-Term Debt [Text Block] Pre-opening costs Pre-opening costs Pre-Opening Costs Name Awards Close in Time to MNPI Disclosures, Individual Name Deferred compensation Increase (Decrease) in Deferred Compensation 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] Aggregate Intrinsic Value (in thousands) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Public offering price (in dollars per share) Sale of Stock, Price Per Share Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Receivables, net Receivables, net Receivables, Net, Current Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Preferred stock, par value $0.00001 per share; 20,000,000 shares authorized, no shares issued or outstanding as of June 30, 2026 and December 31, 2025, respectively Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Class of Stock [Domain] Class of Stock [Domain] Supplier [Axis] Supplier [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid during the year for interest, net of capitalized interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Schedule of Changes in Ownership Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block] Trade receivables Trade Accounts Receivable [Member] Reconciliation of profit or loss Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Abstract] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Thereafter Long Term Debt Maturities Repayments Of Principal After Year Four Long Term Debt Maturities Repayments Of Principal After Year Four Name Measure Name Income Taxes and Tax Receivable Agreement Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Adjusted Secured Overnight Financing Rate (SOFR) Adjusted Secured Overnight Financing Rate (SOFR) [Member] Adjusted Secured Overnight Financing Rate (SOFR) Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Adjustments and reconciling items Adjustments And Reconciling Items Adjustments And Reconciling Items Other Other Inventory, Net of Reserves Name Trading Arrangement, Individual Name Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Cash and cash equivalents Cash and Cash Equivalent Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] TRA remeasurement loss Tax Receivable Agreement Remeasurement Loss Tax Receivable Agreement Remeasurement Loss Entity Address, Address Line Two Entity Address, Address Line Two Issuance of Class A common stock pursuant to vesting of equity awards (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Net income (loss) Net income (loss) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Unitholder distributions Payments of Distributions to Affiliates Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Operating lease right-of-use assets obtained in exchange for lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Recapitalized ownership (in shares) Partners' Capital Account, Units, Converted 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 Income tax expense Income tax expense Income Tax Expense (Benefit) Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Beverage, food and packaging costs Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net increase (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 Other Product and Service, Other [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Third anniversary Share-Based Payment Arrangement, Tranche Three [Member] Net income attributable to Black Rock Coffee Bar, Inc. Net income attributable to Black Rock Coffee Bar, Inc. Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Adjustments and reconciling items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Second anniversary Share-Based Payment Arrangement, Tranche Two [Member] Coffee beans and product inventory Inventory, Work in Process and Raw Materials, Net of Reserves Minimum fixed coverage ratio Debt Instrument, Covenant, Minimum Fixed Charge Coverage Ratio Debt Instrument, Covenant, Minimum Fixed Charge Coverage Ratio Restatement Determination Date: Restatement Determination Date [Axis] Interest income Investment Income, Interest Schedule of Company Gift Card and Loyalty Program Liability Activity Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]