No definition available.

Name:	fiac_FounderSharesAbstract
Namespace Prefix:	fiac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time after the completion of initial Business Combination in which initial shareholders are not permitted to transfer, assign or sell any of their held Founder Shares, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

Period after the initial Business Combination for the common stock price to exceed the threshold price per share, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

Ratio applied to the conversion of stock, for example but not limited to, one share converted to two or two shares converted to one.

+ References

No definition available.

+ Details

Name:	fiac_StockConversionRatio
Namespace Prefix:	fiac_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold period of specified consecutive trading days that common stock price must exceed threshold price for specified number of trading days, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

Threshold number of specified trading days that common stock price must exceed threshold price within a specified consecutive trading period, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.6-05(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(4)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(16)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(7))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-14

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfCommonStock
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

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=fiac_FounderSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_InvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions, Founder Shares (Details)		12 Months Ended
Related Party Transactions, Founder Shares (Details)	Sep. 12, 2023 $ / shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 shares
Founder Shares [Abstract]
Stock conversion basis at time of business combination		1
Class A Common Stock [Member]
Founder Shares [Abstract]
Common stock, shares outstanding (in shares)		5,000,000	0
Class B Common Stock [Member]
Founder Shares [Abstract]
Common stock, shares outstanding (in shares)		750,000	5,750,000
Founder Shares [Member] \| Class A Common Stock [Member] \| Minimum [Member]
Founder Shares [Abstract]
Period after initial business combination		150 days
Sponsor [Member]
Founder Shares [Abstract]
Stock conversion basis at time of business combination	1
Holding period for transfer, assignment or sale of founder shares		360 days
Threshold trading days		20 days
Threshold consecutive trading days		30 days
Period after initial business combination		150 days
Sponsor [Member] \| Minimum [Member]
Founder Shares [Abstract]
Share price (in dollars per share) \| $ / shares	$ 12
Sponsor [Member] \| Founder Shares [Member] \| Class A Common Stock [Member]
Founder Shares [Abstract]
Threshold trading days		20 days
Threshold consecutive trading days		30 days
Sponsor [Member] \| Founder Shares [Member] \| Class A Common Stock [Member] \| Minimum [Member]
Founder Shares [Abstract]
Share price (in dollars per share) \| $ / shares		$ 12
Sponsor [Member] \| Founder Shares [Member] \| Class B Common Stock [Member]
Founder Shares [Abstract]
Proceeds from issuance of ordinary share \| $		$ 25,000
Common stock, shares outstanding (in shares)		5,750,000
Stock conversion basis at time of business combination		1
Holding period for transfer, assignment or sale of founder shares		360 days