|
Financial Instruments and Fair Value Measurements , Fair Value Measurements (Details) (Recurring [Member], USD $)
In Thousands, unless otherwise specified
|
Mar. 31, 2015
|
Dec. 31, 2014
|
| Estimate of Fair Value [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total Assets, Fair Value Disclosure |
$ 715,367us-gaap_AssetsFairValueDisclosure
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$ 721,801us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
| Estimate of Fair Value [Member] | Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total Assets, Fair Value Disclosure |
31,155us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember |
15,309us-gaap_AssetsFairValueDisclosure
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/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
| Estimate of Fair Value [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total Assets, Fair Value Disclosure |
684,212us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
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706,492us-gaap_AssetsFairValueDisclosure
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
| Estimate of Fair Value [Member] | Corporate debt securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
568,806us-gaap_AvailableForSaleSecurities
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
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589,016us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueMeasurementsRecurringMember
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= us-gaap_CorporateDebtSecuritiesMember |
| Estimate of Fair Value [Member] | Corporate debt securities [Member] | Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
0us-gaap_AvailableForSaleSecurities
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= us-gaap_CorporateDebtSecuritiesMember |
0us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember |
| Estimate of Fair Value [Member] | Corporate debt securities [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
568,806us-gaap_AvailableForSaleSecurities
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/ us-gaap_FairValueByMeasurementBasisAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember |
589,016us-gaap_AvailableForSaleSecurities
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/ us-gaap_FairValueByMeasurementBasisAxis
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= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember |
| Estimate of Fair Value [Member] | Commercial paper [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
43,750us-gaap_AvailableForSaleSecurities
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember |
51,155us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember |
| Estimate of Fair Value [Member] | Commercial paper [Member] | Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
0us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember |
0us-gaap_AvailableForSaleSecurities
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= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember |
| Estimate of Fair Value [Member] | Commercial paper [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
43,750us-gaap_AvailableForSaleSecurities
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/ us-gaap_FairValueByMeasurementBasisAxis
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= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember |
51,155us-gaap_AvailableForSaleSecurities
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/ us-gaap_FairValueByMeasurementBasisAxis
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= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember |
| Estimate of Fair Value [Member] | Municipal bonds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
49,820us-gaap_AvailableForSaleSecurities
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39,721us-gaap_AvailableForSaleSecurities
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= us-gaap_USStatesAndPoliticalSubdivisionsMember |
| Estimate of Fair Value [Member] | Municipal bonds [Member] | Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
0us-gaap_AvailableForSaleSecurities
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0us-gaap_AvailableForSaleSecurities
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= us-gaap_USStatesAndPoliticalSubdivisionsMember |
| Estimate of Fair Value [Member] | Municipal bonds [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
49,820us-gaap_AvailableForSaleSecurities
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39,721us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember |
| Estimate of Fair Value [Member] | Certificates of deposit and term deposits [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
13,080us-gaap_AvailableForSaleSecurities
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22,854us-gaap_AvailableForSaleSecurities
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= us-gaap_CertificatesOfDepositMember |
| Estimate of Fair Value [Member] | Certificates of deposit and term deposits [Member] | Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
0us-gaap_AvailableForSaleSecurities
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= us-gaap_CertificatesOfDepositMember |
| Estimate of Fair Value [Member] | Certificates of deposit and term deposits [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
13,080us-gaap_AvailableForSaleSecurities
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22,854us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember |
| Estimate of Fair Value [Member] | Money market funds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
29,154us-gaap_AvailableForSaleSecurities
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13,311us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ftnt_MoneyMarketFundsExcludingCommercialPaperMember |
| Estimate of Fair Value [Member] | Money market funds [Member] | Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
29,154us-gaap_AvailableForSaleSecurities
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/ us-gaap_FairValueByMeasurementBasisAxis
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13,311us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ftnt_MoneyMarketFundsExcludingCommercialPaperMember |
| Estimate of Fair Value [Member] | Money market funds [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
0us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ftnt_MoneyMarketFundsExcludingCommercialPaperMember |
| Estimate of Fair Value [Member] | U.S. government and agency securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
10,757us-gaap_AvailableForSaleSecurities
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5,744us-gaap_AvailableForSaleSecurities
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= us-gaap_USTreasuryAndGovernmentMember |
| Estimate of Fair Value [Member] | U.S. government and agency securities [Member] | Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
2,001us-gaap_AvailableForSaleSecurities
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1,998us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueMeasurementsRecurringMember
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= us-gaap_USTreasuryAndGovernmentMember |
| Estimate of Fair Value [Member] | U.S. government and agency securities [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
8,756us-gaap_AvailableForSaleSecurities
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= us-gaap_USTreasuryAndGovernmentMember |
3,746us-gaap_AvailableForSaleSecurities
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= us-gaap_USTreasuryAndGovernmentMember |
| Reported as [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total Assets, Fair Value Disclosure |
715,367us-gaap_AssetsFairValueDisclosure
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721,801us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember |
| Reported as [Member] | Cash equivalents [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
29,154us-gaap_AvailableForSaleSecurities
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13,311us-gaap_AvailableForSaleSecurities
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| Reported as [Member] | Short-term investments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
417,605us-gaap_AvailableForSaleSecurities
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436,766us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueMeasurementsRecurringMember |
| Reported as [Member] | Long-term investments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, Fair Value Disclosure |
$ 268,608us-gaap_AvailableForSaleSecurities
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/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
$ 271,724us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= ftnt_LongTermInvestmentsLineItemMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |