The maximum amount which a potential loan could have repaid through issuance of warrants.

No definition available.

Name:	fhltu_MaximumLoansConvertibleIntoWarrants
Namespace Prefix:	fhltu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount of offering discounts and commissions incurred for underwriters.

+ References

No definition available.

+ Details

Name:	fhltu_SaleOfStockUnderwritingDiscountsAndCommissions
Namespace Prefix:	fhltu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

When determining the condition for transfer of shares without restriction after a business combination, the number of consecutive trading days used to observe the share price.

+ References

No definition available.

+ Details

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

- Definition

The amount of working capital loan outstanding.

+ References

No definition available.

+ Details

Name:	fhltu_WorkingCapitalLoan
Namespace Prefix:	fhltu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfWarrants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=fhltu_PrivatePlacementWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=fhltu_WorkingCapitalLoansWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions - Additional information (Details) - USD ($)		3 Months Ended	10 Months Ended
	Sep. 09, 2021	Mar. 31, 2022	Dec. 31, 2021
Subsidiary, Sale of Stock [Line Items]
Proceeds from sale of Private Placement Warrants			$ 7,375,000
Private Placement Warrants
Subsidiary, Sale of Stock [Line Items]
Sale of Private Placement Warrants (in shares)		7,375,000	7,375,000
Threshold period for not to transfer, assign or sell any Warrants		30 days	30 days
Working capital loans
Subsidiary, Sale of Stock [Line Items]
Share Price		$ 1.00
Loan conversion agreement warrant		$ 2,000,000	$ 2,000,000
Working capital loan, outstanding		$ 0	$ 0
Private Placement
Subsidiary, Sale of Stock [Line Items]
Sale of Private Placement Warrants (in shares)	7,375,000
Proceeds from sale of Private Placement Warrants	$ 7,375,000
Private Placement \| Private Placement Warrants
Subsidiary, Sale of Stock [Line Items]
Sale of Private Placement Warrants (in shares)	7,375,000
Share Price	$ 11.50
Proceeds from sale of Private Placement Warrants	$ 7,375,000
Number of shares issuable per warrant	1
Exercise price of warrants	$ 11.50
Underwriting discounts and commissions	$ 0