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v3.26.1

Organization, Description of Business and Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2026 USD ($) | Jun. 30, 2025 USD ($) $ / shares shares | Mar. 31, 2026 client issuer $ / shares shares | Mar. 31, 2025 client
Summary of Significant Accounting Policies |  |  |  |
Number of issuers of credit card receivable | issuer |  |  | 2 |
Common stock, shares outstanding, after reorganization |  | 64,060,082 |  |
Shares repurchased | $ | $ 58.9 |  |  |
Purchased Receivables | Purchase concentration | Top five clients |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Number of major suppliers | client |  |  | 5 | 5
Concentration risk percentage |  |  | 41.30% | 53.40%
Purchased Receivables | Purchase concentration | Top client |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage |  |  | 9.20% | 17.00%
Class B units |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Vesting period |  | 3 years |  |
JCAP TopCo, LLC [Member] | Class A And Class C Units |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Number of units outstanding |  |  | 132,828,019 |
JCAP TopCo, LLC [Member] | Class B units |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Number of units outstanding |  | 27,937,232 |  |
IPO |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Offering price | $ / shares |  | $ 15 | $ 15 |
Net proceeds | $ |  | $ 4.5 |  |
Shares issued (in shares) |  | 625,000 |  |
Sale of Stock, Number of Shares Issued in Transaction |  | 10,875,000 |  |
JCAP TopCo, LLC [Member] |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Exchange ratio of stock |  |  | 2.4150549 |
JCAP TopCo, LLC [Member] | Class A And Class C Units |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Shares Issued, Conversion of stock |  |  | 55,000,000 |
JCAP TopCo, LLC [Member] | Class B units |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Shares Issued, Conversion of stock |  | 9,060,082 |  |
JCAP TopCo, LLC [Member] | Class B units | Management Stockholders |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Shares Issued, Conversion of stock |  | 6,418,775 |  |
Jefferson Capital Holdings, LLC | J C Flowers |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Ownership percentage | 53.10% |  | 67.60% |
Jefferson Capital Holdings, LLC | Management Stockholders |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Ownership percentage, Noncontrolling owner |  |  | 14.50% |
Jefferson Capital Holdings, LLC | IPO | Investors |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Ownership percentage, Noncontrolling owner |  |  | 32.40% |
Jefferson Capital Holdings, LLC | JCAP TopCo, LLC [Member] |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Ownership percentage |  | 100.00% |  |
JCAP TopCo, LLC [Member] |  |  |  |
Summary of Significant Accounting Policies |  |  |  |
Ownership percentage |  | 100.00% |  |

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