Subsequent Events (Details)	Oct. 24, 2021 shares
Subsequent Events
Overallotment option expiration period	45 days
Number Of Shares Subject To Forfeiture	750,000

Overallotment option expiration period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	fhltu_OverallotmentOptionExpirationPeriod
Namespace Prefix:	fhltu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration