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

Price per share or per unit of warrants or rights outstanding.

No definition available.

Name:	fhltu_ClassOfWarrantOrRightPriceOfWarrantsOrRights
Namespace Prefix:	fhltu_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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

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

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_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

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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: