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Significant Accounting Policies (Details) - Schedule of revenue by timing of revenue recognition - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of revenue by timing of revenue recognition [Abstract] |  |  |
Products and services transferred over time | $ 2,072,841 | $ 1,697,312 | $ 1,518,221
Products transferred at a point in time | 331,535 | 236,606 | 182,894
Total | $ 2,404,376 | $ 1,933,918 | $ 1,701,115

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Namespace Prefix: | forty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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- References No definition available. + Details
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Namespace Prefix: | forty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration