SCHEDULE OF CONVERTIBLE NOTES PAYABLE (Details) (Parenthetical) - $ / shares	9 Months Ended	12 Months Ended
Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
10% OID Senior Secured Convertible Notes [Member]
Short-Term Debt [Line Items]
Interest rate	10.00%	10.00%	10.00%
Share price per share	$ 0.75	$ 0.75	$ 0.75
Thirty Five Percent OID Senior Secured Convertible Notes [Member]
Short-Term Debt [Line Items]
Interest rate	35.00%	35.00%
Debt instrument term	2 years	2 years
Twenty Percent OID Senior Secured Convertible Notes [Member]
Short-Term Debt [Line Items]
Interest rate	10.00%	10.00%
Share price per share	$ 1.00	$ 1.00
35 % OID Super Priority Senior Secured Convertible Notes [Member]
Short-Term Debt [Line Items]
Interest rate		35.00%	35.00%
Debt instrument term		2 years	2 years
20% OID Senior Secured Convertible Notes Payable [Member]
Short-Term Debt [Line Items]
Interest rate		10.00%	10.00%
Share price per share		$ 1.00	$ 1.00

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: 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(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
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_ShortTermDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=FCHS_TenPercentOIDSeniorSecuredConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=FCHS_ThirtyFivePercentOIDSeniorSecuredConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=FCHS_TwentyPercentOIDSeniorSecuredConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=FCHS_ThirtyFivePercentOIDSuperPrioritySeniorSecuredConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=FCHS_TwentyPercentOIDSeniorSecuredConvertibleNotesPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: