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Debentures (Details) - Schedule of aggregate principal annual payments of debentures $ in Thousands | Dec. 31, 2021 USD ($)
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Schedule of aggregate principal annual payments of debentures [Abstract] |
2022 | $ 47,766
2023 | 47,766
2024 | 47,766
2025 | 54,506
2026 | 54,506
Total | $ 252,310

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- Definition Aggregate principal annual payments of debentures. + References No definition available. + Details
Name: | forty_AggregatePrincipalAnnualPaymentsOfDebentures
Namespace Prefix: | forty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of repayments of bonds within next fifth and thereafter financial year. + References No definition available. + Details
Name: | forty_RepaymentsOfBondsWithinNextFifthAndThereafterFinancialYear
Namespace Prefix: | forty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of repayments of bonds within next financial year. + References No definition available. + Details
Name: | forty_RepaymentsOfBondsWithinNextFinancialYear
Namespace Prefix: | forty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of repayments of bonds within next fourth financial year. + References No definition available. + Details
Name: | forty_RepaymentsOfBondsWithinNextFourthFinancialYear
Namespace Prefix: | forty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of repayments of bonds within next second financial year. + References No definition available. + Details
Name: | forty_RepaymentsOfBondsWithinNextSecondFinancialYear
Namespace Prefix: | forty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of repayments of bonds within next third financial year. + References No definition available. + Details
Name: | forty_RepaymentsOfBondsWithinNextThirdFinancialYear
Namespace Prefix: | forty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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Namespace Prefix: | forty_
Data Type: | xbrli:stringItemType
Balance Type: | na
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