FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Schedule of Gross Contractual Obligations (Details) $ in Thousands	Sep. 30, 2024 USD ($)
Financial Instruments [Line Items]
Less than 1 year	$ 55,103
1 to 3 years	58,309
3 to 5 years	0
Greater than 5 years	0
Total	113,412
Accounts payable and accrued liabilities
Financial Instruments [Line Items]
Less than 1 year	26,401
1 to 3 years	2,062
3 to 5 years	0
Greater than 5 years	0
Total	28,463
Convertible notes, notes payable and accrued interest
Financial Instruments [Line Items]
Less than 1 year	28,702
1 to 3 years	40,247
3 to 5 years	0
Greater than 5 years	0
Total	68,949
Construction finance liability
Financial Instruments [Line Items]
Less than 1 year	0
1 to 3 years	16,000
3 to 5 years	0
Greater than 5 years	0
Total	$ 16,000

Financial Instruments.

No definition available.

Name:	ffntf_FinancialInstrumentsLineItems
Namespace Prefix:	ffntf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contractual obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligationDueAfterFifthYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contractual obligation to be paid in fourth and fifth fiscal years following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligationDueInFourthAndFifthYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contractual obligation to be paid in second and third fiscal years following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligationDueInSecondAndThirdYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=ffntf_ConvertibleNotesNotesPayableAndAccruedInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=ffntf_ConstructionFinanceLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: