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FEE AND COMMISSION INCOME AND EXPENSE - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |  |
Customer loyalty program, cash back incentive | $ 32.1 | $ 55.1

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- Definition Customer Loyalty Program, Cash Back Incentive, Amount Netted During Period + References No definition available. + Details
Name: | frhc_CustomerLoyaltyProgramCashBackIncentiveAmountNettedDuringPeriod
Namespace Prefix: | frhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration