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Commitments and Contingencies - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Inventory purchase commitments	$ 714,400,000		$ 714,400,000
Accrued inventory purchase commitments	41,900,000		41,900,000		$ 54,000,000
Inventory purchase (benefit) expense	0	$ 7,000,000	0	$ 38,600,000
Other contractual commitments and open purchase orders	102,700,000		$ 102,700,000
Non-cancelable remaining contract term (in excess of)			1 year
Operating lease liability	93,400,000		$ 93,400,000
Loss accrual	$ 0		$ 0		$ 0

X

- Definition

Accrued Inventory Purchase Commitment, Current

+ References

No definition available.

+ Details

Name:	ftnt_AccruedInventoryPurchaseCommitmentCurrent
Namespace Prefix:	ftnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contract Term Remaining, Non-cancelable

+ References

No definition available.

+ Details

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

X

- Definition

Inventory Purchase Obligation

+ References

No definition available.

+ Details

Name:	ftnt_InventoryPurchaseObligation
Namespace Prefix:	ftnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of loss recognized on firm purchase commitment for inventory.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-SubTopic 10
-Topic 330
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483080/330-10-50-5

+ Details

Name:	us-gaap_InventoryFirmPurchaseCommitmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

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

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

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

X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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