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

X

- 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

X

- Definition

Warranty Length

+ References

No definition available.

+ Details

Name:	ftnt_WarrantyLength
Namespace Prefix:	ftnt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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: