Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation In accordance with accounting principles generally accepted in the United States of America ("GAAP"), since the Continuing Equity Owners control the Company after the Transactions (i.e., there was no change in control of Black Rock OpCo), the financial statements of the combined entity represent a continuation of the financial position and results of operations of Black Rock OpCo. Accordingly, the historical cost basis of assets, liabilities, and equity of Black Rock OpCo are carried over to the condensed consolidated financial statements of the combined company as a common control transaction. The accompanying unaudited condensed consolidated financial statements for the periods prior to the Transactions have been presented to combine the previously separate entities. These unaudited condensed and consolidated financial statements have been prepared in accordance with GAAP and the applicable rules and regulations of the United States Securities and Exchange Commission ("SEC") for interim financial information. Certain information and footnote disclosures normally included in annual financial statements presented in accordance with GAAP have been omitted pursuant to rules and regulations of the SEC. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair statement of the results for the interim periods presented have been included. The unaudited interim financial information should be read in conjunction with the audited consolidated financial statements contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2025 filed with the SEC on March 4, 2026.
Principles of Consolidation	Principles of Consolidation The accompanying condensed consolidated financial statements include the accounts of Black Rock Coffee Bar, Inc. and Black Rock OpCo. Black Rock OpCo is a variable interest entity and Black Rock Coffee Bar, Inc. is the primary beneficiary and sole managing member of Black Rock OpCo and has decision making authority that significantly affects the performance of the entity. Accordingly, the Company consolidates Black Rock OpCo and reports noncontrolling interest representing the economic interest in Black Rock OpCo held by the Continuing Equity Owners. All intercompany balances and transactions have been eliminated in consolidation. The noncontrolling interests in the condensed consolidated statement of operations for the three months ended March 31, 2026 represents the portion of earnings attributable to the economic interest in Black Rock OpCo held by the Continuing Equity Owners. The noncontrolling interest in the condensed consolidated balance sheets as of March 31, 2026 represents the portion of the net assets of the Company attributable to the Continuing Equity Owners, based on the portion of the LLC Units owned by such unit holders.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Under the Jumpstart Our Business Startups Act of 2012 (the "JOBS Act"), the Company meets the definition of an emerging growth company. Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. The Company has elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the Company is no longer an emerging growth company or until the Company affirmatively and irrevocably opts out of the extended transition period. As a result, the Company's financial statements may not be comparable to companies that comply with new or revised accounting pronouncements as of public company effective dates. Recently Issued Accounting Standards In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The amendments in the update are intended to enhance the transparency and decision usefulness of income tax disclosures, primarily through improvements to the rate reconciliation and income taxes paid information, specifically requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation, and (2) income taxes paid disaggregated by jurisdiction. These amendments are effective for public business entities’ annual periods beginning after December 15, 2024 and interim periods within fiscal years beginning after December 15, 2025. Furthermore, these amendments are effective for private business entities' annual periods beginning after December 15, 2025 and interim periods within fiscal years beginning after December 15, 2026. The application of these amendments should be applied on a prospective basis. Early adoption is permitted for annual financial statements that have not yet been issued. The Company is currently assessing the potential impacts of this standard on its income tax disclosures and expects to provide additional detail and disclosures under the new guidance. In November 2024, the FASB issued ASU No. 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40). The intent of this ASU is to improve public entity financial footnote disclosures around types of expenses in commonly presented expense categories (i.e. cost of sales, selling, general and administrative expenses, and research and development). The amendments in this ASU do not change or remove current expense disclosure requirements, but rather 1) impact where this information appears in the notes to the consolidated financial statements and 2) add additional disclosure requirements for certain expense line items appearing on the face of the consolidated statement of operations. ASU 2024-03, as amended, is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. The Company will assess potential impacts of this standard on its disclosures in future periods.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2026

In accordance with accounting principles generally accepted in the United States of America ("GAAP"), since the Continuing Equity Owners control the Company after the Transactions (i.e., there was no change in control of Black Rock OpCo), the financial statements of the combined entity represent a continuation of the financial position and results of operations of Black Rock OpCo. Accordingly, the historical cost basis of assets, liabilities, and equity of Black Rock OpCo are carried over to the condensed consolidated financial statements of the combined company as a common control transaction.

The accompanying unaudited condensed consolidated financial statements for the periods prior to the
Transactions have been presented to combine the previously separate entities. These unaudited condensed and consolidated financial statements have been prepared in accordance with GAAP and the applicable rules and regulations of the United States Securities and Exchange Commission ("SEC") for interim financial information. Certain information and footnote disclosures normally included in annual financial statements presented in accordance with GAAP have been omitted pursuant to rules and regulations of the SEC. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair statement of the results for the interim periods presented have been included.

The unaudited interim financial information should be read in conjunction with the audited consolidated financial statements contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2025 filed with the SEC on March 4, 2026.

Principles of Consolidation

The accompanying condensed consolidated financial statements include the accounts of Black Rock Coffee Bar, Inc. and Black Rock OpCo. Black Rock OpCo is a variable interest entity and Black Rock Coffee Bar, Inc. is the primary beneficiary and sole managing member of Black Rock OpCo and has decision making authority that significantly affects the performance of the entity. Accordingly, the Company consolidates Black Rock OpCo and reports noncontrolling interest representing the economic interest in Black Rock OpCo held by the Continuing Equity Owners. All intercompany balances and transactions have been eliminated in consolidation.

The noncontrolling interests in the condensed consolidated statement of operations for the three months ended March 31, 2026 represents the portion of earnings attributable to the economic interest in Black Rock OpCo held by the Continuing Equity Owners. The noncontrolling interest in the condensed consolidated balance sheets as of March 31, 2026 represents the portion of the net assets of the Company attributable to the Continuing Equity Owners, based on the portion of the LLC Units owned by such unit holders.

Recent Accounting Pronouncements

Under the Jumpstart Our Business Startups Act of 2012 (the "JOBS Act"), the Company meets the definition of an emerging growth company. Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. The Company has elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the Company is no longer an emerging growth company or until the Company affirmatively and irrevocably opts out of the extended transition period. As a result, the Company's financial statements may not be comparable to companies that comply with new or revised accounting pronouncements as of public company effective dates.

Recently Issued Accounting Standards

In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The amendments in the update are intended to enhance the transparency and decision usefulness of income tax disclosures, primarily through improvements to the rate reconciliation and income taxes paid information, specifically requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation, and (2) income taxes paid disaggregated by jurisdiction. These amendments are effective for public business entities’ annual periods beginning after December 15, 2024 and interim periods within fiscal years beginning after December 15, 2025. Furthermore, these amendments are effective for private business entities' annual periods beginning after December 15, 2025 and interim periods within fiscal years beginning after December 15, 2026. The application of these amendments should be applied on a prospective basis. Early adoption is permitted for annual financial statements that have not yet been issued. The Company is currently assessing the potential impacts of this standard on its income tax disclosures and expects to provide additional detail and disclosures under the new guidance.

In November 2024, the FASB issued ASU No. 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40). The intent of this ASU is to improve public entity financial footnote disclosures around types of expenses in commonly presented expense categories (i.e. cost of sales, selling, general and administrative expenses, and research and development). The amendments in this ASU do not change or remove current expense disclosure requirements, but rather 1) impact where this information appears in the notes to the consolidated financial statements and 2) add additional disclosure requirements for certain expense line items appearing on the face of the consolidated statement of operations. ASU 2024-03, as amended, is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. The Company will assess potential impacts of this standard on its disclosures in future periods.