| RECAST - Condensed Consolidated Balance Sheet (Details) - USD ($)$ in Thousands
 | Dec. 31, 2022 | Sep. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | 
| ASSETS |  |  |  |  |  |  |  | 
| Cash and cash equivalents | $ 664,095 |  | $ 225,464 | [1] |  |  |  | 
| Trading securities | 1,929,840 |  | 1,158,377 | [1] |  |  |  | 
| Restricted cash | 449,979 |  | 547,950 | [1] |  |  |  | 
| Margin lending, brokerage and other receivables, net | 403,568 |  | 147,659 | [1] |  |  |  | 
| Loans issued | 639,377 |  | 92,446 | [1] |  |  |  | 
| Other assets | 47,754 |  | 27,044 | [1] |  |  |  | 
| Fixed assets, net | 43,862 |  | 17,823 | [1] |  |  |  | 
| Right-of-use asset | 24,054 |  | 7,431 | [1] |  |  |  | 
| Intangible assets, net | 9,010 |  | 5,163 | [1] |  |  |  | 
| Goodwill | 9,460 |  | 5,898 | [1] |  |  |  | 
| Available-for-sale securities, at fair value | 174,326 |  | 161,364 | [1] |  |  |  | 
| Insurance contract assets | 11,243 |  | 5,712 | [1] |  |  |  | 
| Assets held for sale | 961,566 |  | 825,419 | [1] |  |  |  | 
| TOTAL ASSETS | 5,368,134 |  | 3,227,750 | [1] |  |  |  | 
| LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Securities repurchase agreement obligations | 1,233,928 |  | 840,224 | [1] |  |  |  | 
| Customer liabilities | 1,786,452 |  | 765,628 | [1] |  |  |  | 
| Margin lending and trade payables | 142,341 |  | 45,083 | [1] |  |  |  | 
| Liabilities from insurance activity | 156,542 |  | 119,490 | [1] |  |  |  | 
| Current income tax liability | 0 |  | 14,556 | [1] |  |  |  | 
| Securities sold, not yet purchased – at fair value | 0 |  | 13,865 | [1] |  |  | $ 8,569 | 
| Debt securities issued | 37,192 |  | 34,390 | [1] |  |  |  | 
| Lease liability | 24,175 |  | 7,504 | [1] |  |  |  | 
| Other liabilities | 37,940 |  | 21,477 | [1] |  |  |  | 
| Liability arising from continuing involvement | 319,694 |  | 6,447 |  |  |  |  | 
| Liabilities held for sale | 931,484 |  | 812,478 | [1] |  |  |  | 
| TOTAL LIABILITIES | 4,685,803 |  | 2,681,142 | [1] |  |  |  | 
| Commitments and Contingent Liabilities (Note 26) | 0 |  | 0 | [1] |  |  |  | 
| SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Preferred stock - $0.001 par value; 20,000,000 shares authorized, no shares issued or outstanding | 0 |  | 0 | [1] |  |  |  | 
| Common stock - $0.001 par value; 500,000,000 shares authorized; | 59 |  | 59 | [1] |  |  |  | 
| Additional paid in capital | 159,580 |  | 174,745 | [1] |  |  |  | 
| Retained earnings | 592,115 |  | 441,924 | [1] |  |  |  | 
| Accumulated other comprehensive loss | (60,920) |  | (63,125) | [1] |  |  |  | 
| TOTAL FRHC SHAREHOLDERS’ EQUITY | 690,834 |  | 553,603 | [1] |  |  |  | 
| Non-controlling interest | (8,503) |  | (6,995) | [1] |  |  |  | 
| TOTAL SHAREHOLDERS’ EQUITY | 682,331 | $ 621,331 | 546,608 | [1] | $ 633,007 | $ 583,132 | $ 307,671 | 
| TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY | 5,368,134 |  | 3,227,750 | [1] |  |  |  | 
| Recast discontinued operations |  |  |  |  |  |  |  | 
| ASSETS |  |  |  |  |  |  |  | 
| Cash and cash equivalents | 582,314 |  | 428,480 |  |  |  |  | 
| Trading securities | 112,801 |  | 122,497 |  |  |  |  | 
| Restricted cash | 18,052 |  | 28,406 |  |  |  |  | 
| Margin lending, brokerage and other receivables, net | 240,414 |  | 210,087 |  |  |  |  | 
| Loans issued | 17,201 |  | 2,395 |  |  |  |  | 
| Other assets | 34,757 |  | 33,554 |  |  |  |  | 
| TOTAL ASSETS | 961,566 |  | 825,419 |  |  |  |  | 
| LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Securities repurchase agreement obligations | 30,971 |  | 32,469 |  |  |  |  | 
| Customer liabilities | 820,394 |  | 701,584 |  |  |  |  | 
| Debt securities issued | 63,207 |  | 64,637 |  |  |  |  | 
| Other liabilities | 16,912 |  | 13,788 |  |  |  |  | 
| TOTAL LIABILITIES | $ 931,484 |  | 812,478 |  |  |  |  | 
| As previously reported |  |  |  |  |  |  |  | 
| ASSETS |  |  |  |  |  |  |  | 
| Cash and cash equivalents |  |  | 625,547 |  |  |  |  | 
| Trading securities |  |  | 1,203,479 |  |  |  |  | 
| Restricted cash |  |  | 553,680 |  |  |  |  | 
| Margin lending, brokerage and other receivables, net |  |  | 357,567 |  |  |  |  | 
| Loans issued |  |  | 94,797 |  |  |  |  | 
| Other assets |  |  | 37,725 |  |  |  |  | 
| Fixed assets, net |  |  | 21,365 |  |  |  |  | 
| Right-of-use asset |  |  | 15,669 |  |  |  |  | 
| Intangible assets, net |  |  | 5,791 |  |  |  |  | 
| Goodwill |  |  | 5,388 |  |  |  |  | 
| Available-for-sale securities, at fair value |  |  | 1 |  |  |  |  | 
| Insurance contract assets |  |  | 0 |  |  |  |  | 
| Assets held for sale |  |  | 0 |  |  |  |  | 
| TOTAL ASSETS |  |  | 2,921,009 |  |  |  |  | 
| LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Securities repurchase agreement obligations |  |  | 775,178 |  |  |  |  | 
| Customer liabilities |  |  | 1,417,937 |  |  |  |  | 
| Margin lending and trade payables |  |  | 45,229 |  |  |  |  | 
| Liabilities from insurance activity |  |  | 0 |  |  |  |  | 
| Current income tax liability |  |  | 14,556 |  |  |  |  | 
| Securities sold, not yet purchased – at fair value |  |  | 14,103 |  |  |  |  | 
| Debt securities issued |  |  | 99,027 |  |  |  |  | 
| Lease liability |  |  | 15,315 |  |  |  |  | 
| Other liabilities |  |  | 25,542 |  |  |  |  | 
| Liability arising from continuing involvement |  |  | 6,447 |  |  |  |  | 
| Liabilities held for sale |  |  | 0 |  |  |  |  | 
| TOTAL LIABILITIES |  |  | 2,413,334 |  |  |  |  | 
| Commitments and Contingent Liabilities (Note 26) |  |  | 0 |  |  |  |  | 
| SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Preferred stock - $0.001 par value; 20,000,000 shares authorized, no shares issued or outstanding |  |  | 0 |  |  |  |  | 
| Common stock - $0.001 par value; 500,000,000 shares authorized; |  |  | 59 |  |  |  |  | 
| Additional paid in capital |  |  | 141,340 |  |  |  |  | 
| Retained earnings |  |  | 426,563 |  |  |  |  | 
| Accumulated other comprehensive loss |  |  | (53,291) |  |  |  |  | 
| TOTAL FRHC SHAREHOLDERS’ EQUITY |  |  | 514,671 |  |  |  |  | 
| Non-controlling interest |  |  | (6,996) |  |  |  |  | 
| TOTAL SHAREHOLDERS’ EQUITY |  |  | 507,675 |  |  |  |  | 
| TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  | 2,921,009 |  |  |  |  | 
| Revision of prior period, adjustment | Recast discontinued operations |  |  |  |  |  |  |  | 
| ASSETS |  |  |  |  |  |  |  | 
| Cash and cash equivalents |  |  | (400,898) |  |  |  |  | 
| Trading securities |  |  | (122,497) |  |  |  |  | 
| Restricted cash |  |  | (5,730) |  |  |  |  | 
| Margin lending, brokerage and other receivables, net |  |  | (210,087) |  |  |  |  | 
| Loans issued |  |  | (2,395) |  |  |  |  | 
| Other assets |  |  | (18,375) |  |  |  |  | 
| Fixed assets, net |  |  | (3,978) |  |  |  |  | 
| Right-of-use asset |  |  | (8,922) |  |  |  |  | 
| Intangible assets, net |  |  | (2,278) |  |  |  |  | 
| Goodwill |  |  | 0 |  |  |  |  | 
| Available-for-sale securities, at fair value |  |  | 0 |  |  |  |  | 
| Insurance contract assets |  |  | 0 |  |  |  |  | 
| Assets held for sale |  |  | 825,419 |  |  |  |  | 
| TOTAL ASSETS |  |  | 50,259 |  |  |  |  | 
| LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Securities repurchase agreement obligations |  |  | (32,469) |  |  |  |  | 
| Customer liabilities |  |  | (651,326) |  |  |  |  | 
| Margin lending and trade payables |  |  | (147) |  |  |  |  | 
| Liabilities from insurance activity |  |  | 0 |  |  |  |  | 
| Current income tax liability |  |  | 0 |  |  |  |  | 
| Securities sold, not yet purchased – at fair value |  |  | (238) |  |  |  |  | 
| Debt securities issued |  |  | (64,637) |  |  |  |  | 
| Lease liability |  |  | (8,530) |  |  |  |  | 
| Other liabilities |  |  | (4,872) |  |  |  |  | 
| Liability arising from continuing involvement |  |  | 0 |  |  |  |  | 
| Liabilities held for sale |  |  | 812,478 |  |  |  |  | 
| TOTAL LIABILITIES |  |  | 50,259 |  |  |  |  | 
| Commitments and Contingent Liabilities (Note 26) |  |  | 0 |  |  |  |  | 
| SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Preferred stock - $0.001 par value; 20,000,000 shares authorized, no shares issued or outstanding |  |  | 0 |  |  |  |  | 
| Common stock - $0.001 par value; 500,000,000 shares authorized; |  |  | 0 |  |  |  |  | 
| Additional paid in capital |  |  | 0 |  |  |  |  | 
| Retained earnings |  |  | 0 |  |  |  |  | 
| Accumulated other comprehensive loss |  |  | 0 |  |  |  |  | 
| TOTAL FRHC SHAREHOLDERS’ EQUITY |  |  | 0 |  |  |  |  | 
| Non-controlling interest |  |  | 0 |  |  |  |  | 
| TOTAL SHAREHOLDERS’ EQUITY |  |  | 0 |  |  |  |  | 
| TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  | 50,259 |  |  |  |  | 
| Revision of prior period, adjustment | FF Life Acquisition |  |  |  |  |  |  |  | 
| ASSETS |  |  |  |  |  |  |  | 
| Cash and cash equivalents |  |  | 1,427 |  |  |  |  | 
| Trading securities |  |  | 8,875 |  |  |  |  | 
| Restricted cash |  |  | 0 |  |  |  |  | 
| Margin lending, brokerage and other receivables, net |  |  | 173 |  |  |  |  | 
| Loans issued |  |  | 44 |  |  |  |  | 
| Other assets |  |  | 7,267 |  |  |  |  | 
| Fixed assets, net |  |  | 182 |  |  |  |  | 
| Right-of-use asset |  |  | 532 |  |  |  |  | 
| Intangible assets, net |  |  | 1,489 |  |  |  |  | 
| Goodwill |  |  | 359 |  |  |  |  | 
| Available-for-sale securities, at fair value |  |  | 161,363 |  |  |  |  | 
| Insurance contract assets |  |  | 3,555 |  |  |  |  | 
| Assets held for sale |  |  | 0 |  |  |  |  | 
| TOTAL ASSETS |  |  | 185,266 |  |  |  |  | 
| LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Securities repurchase agreement obligations |  |  | 47,691 |  |  |  |  | 
| Customer liabilities |  |  | 0 |  |  |  |  | 
| Margin lending and trade payables |  |  | 0 |  |  |  |  | 
| Liabilities from insurance activity |  |  | 106,329 |  |  |  |  | 
| Current income tax liability |  |  | 0 |  |  |  |  | 
| Securities sold, not yet purchased – at fair value |  |  | 0 |  |  |  |  | 
| Debt securities issued |  |  | 0 |  |  |  |  | 
| Lease liability |  |  | 543 |  |  |  |  | 
| Other liabilities |  |  | 550 |  |  |  |  | 
| Liability arising from continuing involvement |  |  | 0 |  |  |  |  | 
| Liabilities held for sale |  |  | 0 |  |  |  |  | 
| TOTAL LIABILITIES |  |  | 155,113 |  |  |  |  | 
| Commitments and Contingent Liabilities (Note 26) |  |  | 0 |  |  |  |  | 
| SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Preferred stock - $0.001 par value; 20,000,000 shares authorized, no shares issued or outstanding |  |  | 0 |  |  |  |  | 
| Common stock - $0.001 par value; 500,000,000 shares authorized; |  |  | 9,465 |  |  |  |  | 
| Additional paid in capital |  |  | 0 |  |  |  |  | 
| Retained earnings |  |  | 28,131 |  |  |  |  | 
| Accumulated other comprehensive loss |  |  | (7,443) |  |  |  |  | 
| TOTAL FRHC SHAREHOLDERS’ EQUITY |  |  | 30,153 |  |  |  |  | 
| Non-controlling interest |  |  | 1 |  |  |  |  | 
| TOTAL SHAREHOLDERS’ EQUITY |  |  | 30,154 |  |  |  |  | 
| TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  | 185,267 |  |  |  |  | 
| Revision of prior period, adjustment | FF Life Acquisition | Elimi-nations |  |  |  |  |  |  |  | 
| ASSETS |  |  |  |  |  |  |  | 
| Cash and cash equivalents |  |  | (901) |  |  |  |  | 
| Trading securities |  |  | 0 |  |  |  |  | 
| Restricted cash |  |  | 0 |  |  |  |  | 
| Margin lending, brokerage and other receivables, net |  |  | (34) |  |  |  |  | 
| Loans issued |  |  | 0 |  |  |  |  | 
| Other assets |  |  | 0 |  |  |  |  | 
| Fixed assets, net |  |  | 0 |  |  |  |  | 
| Right-of-use asset |  |  | 0 |  |  |  |  | 
| Intangible assets, net |  |  | 0 |  |  |  |  | 
| Goodwill |  |  | 0 |  |  |  |  | 
| Available-for-sale securities, at fair value |  |  | 0 |  |  |  |  | 
| Insurance contract assets |  |  | 0 |  |  |  |  | 
| Assets held for sale |  |  | 0 |  |  |  |  | 
| TOTAL ASSETS |  |  | (935) |  |  |  |  | 
| LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Securities repurchase agreement obligations |  |  | 0 |  |  |  |  | 
| Customer liabilities |  |  | (901) |  |  |  |  | 
| Margin lending and trade payables |  |  | 0 |  |  |  |  | 
| Liabilities from insurance activity |  |  | 0 |  |  |  |  | 
| Current income tax liability |  |  | 0 |  |  |  |  | 
| Securities sold, not yet purchased – at fair value |  |  | 0 |  |  |  |  | 
| Debt securities issued |  |  | 0 |  |  |  |  | 
| Lease liability |  |  | 0 |  |  |  |  | 
| Other liabilities |  |  | (35) |  |  |  |  | 
| Liability arising from continuing involvement |  |  | 0 |  |  |  |  | 
| Liabilities held for sale |  |  | 0 |  |  |  |  | 
| TOTAL LIABILITIES |  |  | (936) |  |  |  |  | 
| Commitments and Contingent Liabilities (Note 26) |  |  | 0 |  |  |  |  | 
| SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Preferred stock - $0.001 par value; 20,000,000 shares authorized, no shares issued or outstanding |  |  | 0 |  |  |  |  | 
| Common stock - $0.001 par value; 500,000,000 shares authorized; |  |  | (9,465) |  |  |  |  | 
| Additional paid in capital |  |  | 16,499 |  |  |  |  | 
| Retained earnings |  |  | (6,666) |  |  |  |  | 
| Accumulated other comprehensive loss |  |  | (368) |  |  |  |  | 
| TOTAL FRHC SHAREHOLDERS’ EQUITY |  |  | 0 |  |  |  |  | 
| Non-controlling interest |  |  | 0 |  |  |  |  | 
| TOTAL SHAREHOLDERS’ EQUITY |  |  | 0 |  |  |  |  | 
| TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  | (936) |  |  |  |  | 
| Revision of prior period, adjustment | Insurance acquisitions |  |  |  |  |  |  |  | 
| ASSETS |  |  |  |  |  |  |  | 
| Cash and cash equivalents |  |  | 371 |  |  |  |  | 
| Trading securities |  |  | 68,520 |  |  |  |  | 
| Restricted cash |  |  | 0 |  |  |  |  | 
| Margin lending, brokerage and other receivables, net |  |  | 60 |  |  |  |  | 
| Loans issued |  |  | 0 |  |  |  |  | 
| Other assets |  |  | 427 |  |  |  |  | 
| Fixed assets, net |  |  | 254 |  |  |  |  | 
| Right-of-use asset |  |  | 152 |  |  |  |  | 
| Intangible assets, net |  |  | 161 |  |  |  |  | 
| Goodwill |  |  | 151 |  |  |  |  | 
| Available-for-sale securities, at fair value |  |  | 0 |  |  |  |  | 
| Insurance contract assets |  |  | 2,157 |  |  |  |  | 
| Assets held for sale |  |  | 0 |  |  |  |  | 
| TOTAL ASSETS |  |  | 72,253 |  |  |  |  | 
| LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Securities repurchase agreement obligations |  |  | 49,824 |  |  |  |  | 
| Customer liabilities |  |  | 0 |  |  |  |  | 
| Margin lending and trade payables |  |  | 21 |  |  |  |  | 
| Liabilities from insurance activity |  |  | 13,161 |  |  |  |  | 
| Current income tax liability |  |  | 0 |  |  |  |  | 
| Securities sold, not yet purchased – at fair value |  |  | 0 |  |  |  |  | 
| Debt securities issued |  |  | 0 |  |  |  |  | 
| Lease liability |  |  | 176 |  |  |  |  | 
| Other liabilities |  |  | 292 |  |  |  |  | 
| Liability arising from continuing involvement |  |  | 0 |  |  |  |  | 
| Liabilities held for sale |  |  | 0 |  |  |  |  | 
| TOTAL LIABILITIES |  |  | 63,474 |  |  |  |  | 
| Commitments and Contingent Liabilities (Note 26) |  |  | 0 |  |  |  |  | 
| SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Preferred stock - $0.001 par value; 20,000,000 shares authorized, no shares issued or outstanding |  |  | 0 |  |  |  |  | 
| Common stock - $0.001 par value; 500,000,000 shares authorized; |  |  | 15,577 |  |  |  |  | 
| Additional paid in capital |  |  | 0 |  |  |  |  | 
| Retained earnings |  |  | (4,811) |  |  |  |  | 
| Accumulated other comprehensive loss |  |  | (1,987) |  |  |  |  | 
| TOTAL FRHC SHAREHOLDERS’ EQUITY |  |  | 8,779 |  |  |  |  | 
| Non-controlling interest |  |  | 0 |  |  |  |  | 
| TOTAL SHAREHOLDERS’ EQUITY |  |  | 8,779 |  |  |  |  | 
| TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  | 72,253 |  |  |  |  | 
| Revision of prior period, adjustment | Insurance acquisitions | Elimi-nations |  |  |  |  |  |  |  | 
| ASSETS |  |  |  |  |  |  |  | 
| Cash and cash equivalents |  |  | (82) |  |  |  |  | 
| Trading securities |  |  | 0 |  |  |  |  | 
| Restricted cash |  |  | 0 |  |  |  |  | 
| Margin lending, brokerage and other receivables, net |  |  | (20) |  |  |  |  | 
| Loans issued |  |  | 0 |  |  |  |  | 
| Other assets |  |  | 0 |  |  |  |  | 
| Fixed assets, net |  |  | 0 |  |  |  |  | 
| Right-of-use asset |  |  | 0 |  |  |  |  | 
| Intangible assets, net |  |  | 0 |  |  |  |  | 
| Goodwill |  |  | 0 |  |  |  |  | 
| Available-for-sale securities, at fair value |  |  | 0 |  |  |  |  | 
| Insurance contract assets |  |  | 0 |  |  |  |  | 
| Assets held for sale |  |  | 0 |  |  |  |  | 
| TOTAL ASSETS |  |  | (102) |  |  |  |  | 
| LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Securities repurchase agreement obligations |  |  | 0 |  |  |  |  | 
| Customer liabilities |  |  | (82) |  |  |  |  | 
| Margin lending and trade payables |  |  | (20) |  |  |  |  | 
| Liabilities from insurance activity |  |  | 0 |  |  |  |  | 
| Current income tax liability |  |  | 0 |  |  |  |  | 
| Securities sold, not yet purchased – at fair value |  |  | 0 |  |  |  |  | 
| Debt securities issued |  |  | 0 |  |  |  |  | 
| Lease liability |  |  | 0 |  |  |  |  | 
| Other liabilities |  |  | 0 |  |  |  |  | 
| Liability arising from continuing involvement |  |  | 0 |  |  |  |  | 
| Liabilities held for sale |  |  | 0 |  |  |  |  | 
| TOTAL LIABILITIES |  |  | (102) |  |  |  |  | 
| Commitments and Contingent Liabilities (Note 26) |  |  | 0 |  |  |  |  | 
| SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  | 
| Preferred stock - $0.001 par value; 20,000,000 shares authorized, no shares issued or outstanding |  |  | 0 |  |  |  |  | 
| Common stock - $0.001 par value; 500,000,000 shares authorized; |  |  | (15,577) |  |  |  |  | 
| Additional paid in capital |  |  | 16,906 |  |  |  |  | 
| Retained earnings |  |  | (1,293) |  |  |  |  | 
| Accumulated other comprehensive loss |  |  | (36) |  |  |  |  | 
| TOTAL FRHC SHAREHOLDERS’ EQUITY |  |  | 0 |  |  |  |  | 
| Non-controlling interest |  |  | 0 |  |  |  |  | 
| TOTAL SHAREHOLDERS’ EQUITY |  |  | 0 |  |  |  |  | 
| TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  | $ (102) |  |  |  |  | 
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