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Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023
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