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v3.25.3

Commitments and Contingencies - Summary of Inventory Purchase Commitments (Details) $ in Millions | Sep. 30, 2025 USD ($)
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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