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Commitments and Contingencies - Summary of Inventory Purchase Commitments (Details) $ in Millions	Sep. 30, 2025 USD ($)
Inventory purchase commitments
Total	$ 732.5
2025	359.5
Thereafter	$ 373.0

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

- Definition

Inventory Purchase Obligation, To Be Paid, Remainder of Year One

+ References

No definition available.

+ Details

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

X

- Definition

Inventory Purchase Obligation, To Be Paid, Thereafter

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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