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v3.25.4

Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 28, 2025 shares | Sep. 15, 2025 USD ($) $ / shares shares | Dec. 31, 2025 shares | Dec. 31, 2025 vote shares | Sep. 11, 2025 shares
Class of Stock [Line Items] |  |  |  |  |
Common stock to LLC unit ratio |  |  | 1 | 1 |
LLC units outstanding |  |  |  |  | 50,055,807
Offering cost | $ |  | $ 8.0 |  |  |
Stock Transfered During Period, Shares | 539,019 |  |  |  |
Black Rock OpCo |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
LLC units outstanding |  |  | 17,478,452 | 17,478,452 |
Economic interest |  |  | 34.90% | 34.90% |
LLC Units held by Black Rock Coffee Bar, Inc. |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
LLC units outstanding |  |  |  |  | 17,478,452
Continuing Equity Owners |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
LLC units outstanding |  |  | 32,577,355 | 32,577,355 | 32,577,355
Voting Percentage |  |  | 92.90% | 92.90% |
Black Rock OpCo | LLC Units held by Black Rock Coffee Bar, Inc. | LLC Units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Sale of stock (in shares) |  | 3,857,642 |  |  |
Net proceeds from IPO | $ |  | $ 71.8 |  |  |
Continuing Equity Owners | Black Rock OpCo |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Economic interest |  |  | 65.10% | 65.10% |
Common stock units subject to time based requirements (in shares) |  |  |  | 80,500 |
Continuing Equity Owners | LLC Units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Sale of stock (in shares) |  | 13,054,122 |  |  |
Net proceeds from IPO | $ |  | $ 242.8 |  |  |
IPO |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Sale of stock (in shares) |  | 16,911,764 |  |  |
Public offering price | $ / shares |  | $ 20.00 |  |  |
Issuance of common stock | $ |  | $ 314.6 |  |  |
Net proceeds from IPO | $ |  | $ 306.5 |  |  |
Over-Allotment Option |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Sale of stock (in shares) |  | 2,205,882 |  |  |
Class A Common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of votes per share | vote |  |  |  | 1 |
Shares outstanding (in shares) |  |  | 17,478,452 | 17,478,452 |
Voting Percentage |  |  | 7.10% | 7.10% |
Class B Common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of votes per share | vote |  |  |  | 1 |
Shares outstanding (in shares) |  |  | 10,916,155 | 10,916,155 |
Class B Common stock | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
LLC units and class c common stock (in shares) | 539,019 |  | 539,000 |  |
Class C Common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of votes per share | vote |  |  |  | 10 |
Shares outstanding (in shares) |  |  | 21,661,200 | 21,661,200 |
Class C Common stock | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
LLC units and class c common stock (in shares) |  |  | (539,000) |  |

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