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Income Taxes (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023
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Income Tax Disclosure [Abstract] |  |
Limited partners' carried interest fair value | $ 2.9 | $ 9.8

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- Definition Limited Partners' Carried Interest at Fair Value + References No definition available. + Details
Name: | fhi_LimitedPartnersCarriedInterestAtFairValue
Namespace Prefix: | fhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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