Additional amount of cash outflow for purchase of marketable security.

No definition available.

Name:	fiac_AdditionalPaymentsToAcquireMarketableSecurities
Namespace Prefix:	fiac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Period Type:	instant

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

The amount of lenders contribution as loan not redeemed in connection with the Extension Meeting, to be deposited into the Trust Account

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The per share amount of lenders contribution as loan not redeemed in connection with the Extension Meeting, to be deposited into the Trust Account.

+ References

No definition available.

+ Details

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- Definition

The number of business days as disclosed in the Proxy Statement, relating to the extraordinary general meeting of shareholders (the "Extension Meeting"), the Sponsor agreed that if the Extension Amendment Proposal is approved, it or one or more of its affiliates, members or third-party designees (the "Lender") will contribute to the Company as a loan, of one year, five months, and thirteen days.

+ References

No definition available.

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Data Type:	xbrli:durationItemType
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- Definition

The number of times permitted to extend period of time to consummate a business combination.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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Period Type:	duration

- Definition

The difference period between the original termination date and additional charter extension date, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Advance notice period, to consummate an initial business combination prior to the applicable termination date, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	fiac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The period of time for each extension to consummate a Business Combination after charter extension date, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	fiac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of redemption limitation amendment proposal amount.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of cash outflow for trust extension funding.

+ References

No definition available.

+ Details

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Namespace Prefix:	fiac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Aggregate amount of redemption requirements for each class or type of redeemable stock classified as temporary equity for each of the five years following the latest balance sheet date. The redemption requirement does not constitute an unconditional obligation that will be settled in a variable number of shares constituting a monetary value predominantly indexed to (a) a fixed monetary amount known at inception, (b) an amount inversely correlated with the residual value of the entity, or (c) an amount determined by reference to something other than the fair value of issuer's stock. Does not include mandatorily redeemable stock. The exception is if redemption is required upon liquidation or termination of the reporting entity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

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- Definition

The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

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Organization and Business Operations, Extension of Combination Period (Details)					12 Months Ended
	Dec. 29, 2023 USD ($) Extension $ / shares shares	Dec. 01, 2023 USD ($)	Oct. 31, 2023 USD ($)	Apr. 25, 2023 USD ($) Extension $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	May 09, 2023 USD ($) $ / shares
Extension of Combination Period [Abstract]
Period of extension to consummate business combination					1 month
Period of advance notice to consummate initial business combination					5 days
Period of additional charter extension date	10 months				12 months
Redemption limitation amendment proposal amount				$ 5,000,000
Number of business days					10 days
Lenders contribution deposited in trust account				$ 162,500
Lenders contribution deposited in trust account (in dollars per share) \| $ / shares				$ 0.0325
Additional cash deposited in Trust Account		$ 162,500	$ 162,500
Trust extension funding					$ 1,300,000
Warrants price (in dollars per share) \| $ / shares							$ 1
Class A Common Stock [Member]
Extension of Combination Period [Abstract]
Common stock subject to possible redemption (in shares) \| shares	3,985,213			21,282,422	1,717,578	23,000,000
Common stock subject to possible redemption (in dollars per share) \| $ / shares				$ 0.0001
Redemption price (in dollars per share) \| $ / shares	$ 10.95			$ 10.4	$ 10.98	$ 10.31
Aggregate redemption amount	$ 43,640,022			$ 179,860,588	$ 223,500,610
Trust extension funding					1,300,000	$ 0
Maximum [Member]
Extension of Combination Period [Abstract]
Number of extensions to extend time to consummate a business combination \| Extension	7			9
Maximum [Member] \| Promissory Note [Member]
Extension of Combination Period [Abstract]
Principal amount		$ 1,500,000			$ 1,500,000		$ 1,500,000
IPO [Member]
Extension of Combination Period [Abstract]
Lenders contribution deposited in trust account				$ 487,500
Lenders contribution deposited in trust account (in dollars per share) \| $ / shares				$ 0.0975
Extension Amendment Proposal and the Redemption Limitation Amendment Proposal [Member] \| Class A Common Stock [Member]
Extension of Combination Period [Abstract]
Common stock subject to possible redemption (in shares) \| shares				17,297,209