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The Company and Summary of Significant Accounting Policies , Warranties (Details) | 12 Months Ended
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Dec. 31, 2021
Hardware Products [Member] |
Warranties [Line Items] |
Warranty length | 1 year
Software Products [Member] |
Warranties [Line Items] |
Warranty length | 90 days

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- Definition Warranties [Line Items] + References No definition available. + Details
Name: | ftnt_WarrantiesLineItems
Namespace Prefix: | ftnt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Warranty Length + References No definition available. + Details
Name: | ftnt_WarrantyLength
Namespace Prefix: | ftnt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=ftnt_HardwareProductWarrantyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ftnt_SoftwareProductWarrantyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |