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v2.4.1.9

Basis of Presentation (Cash Cash Equivalents and Short-term Investments) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Mar. 31, 2014
Amortized Cost Basis | $ 152,275 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 151,854 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Gross Unrealized Gain | 58 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain | 55 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain
Gross Unrealized Losses | (221)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss | (96)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss
Total available-for-sale investments, estimated fair value | 152,112 us-gaap_AvailableForSaleSecurities | 151,813 us-gaap_AvailableForSaleSecurities
Reported as: |  |
Cash equivalents | 16,821 us-gaap_CashEquivalentsAtCarryingValue | 32,611 us-gaap_CashEquivalentsAtCarryingValue
Short-term investments | 135,291 us-gaap_ShortTermInvestments | 47,181 us-gaap_ShortTermInvestments
Long-term investments | 0 us-gaap_LongTermInvestments | 72,021 us-gaap_LongTermInvestments
Contractual maturities of investments: |  |
Investments due within one year | 120,291 EGHT_InvestmentsDueWithinOneYear | 79,792 EGHT_InvestmentsDueWithinOneYear
Investments due after one year | 31,821 EGHT_InvestmentsDueAfterOneYear | 72,021 EGHT_InvestmentsDueAfterOneYear
Money Market Funds |  |
Amortized Cost Basis | 16,821 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember | 32,611 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember
Available-for-sale Securities, Gross Unrealized Gain | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember
Gross Unrealized Losses | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember
Total available-for-sale investments, estimated fair value | 16,821 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember | 32,611 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember
Mutual Funds |  |
Amortized Cost Basis | 2,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = EGHT_MutualFundsMember | 1,964 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = EGHT_MutualFundsMember
Available-for-sale Securities, Gross Unrealized Gain | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = EGHT_MutualFundsMember | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = EGHT_MutualFundsMember
Gross Unrealized Losses | (129)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = EGHT_MutualFundsMember | (55)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = EGHT_MutualFundsMember
Total available-for-sale investments, estimated fair value | 1,871 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = EGHT_MutualFundsMember | 1,909 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = EGHT_MutualFundsMember
Commercial Paper |  |
Amortized Cost Basis | 22,948 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember | 30,374 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember
Available-for-sale Securities, Gross Unrealized Gain | 4 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember | 5 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember
Gross Unrealized Losses | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember
Total available-for-sale investments, estimated fair value | 22,952 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember | 30,379 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember
Corporate Debt |  |
Amortized Cost Basis | 71,890 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = EGHT_CorporateDebtMember | 63,621 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = EGHT_CorporateDebtMember
Available-for-sale Securities, Gross Unrealized Gain | 47 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = EGHT_CorporateDebtMember | 35 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = EGHT_CorporateDebtMember
Gross Unrealized Losses | (22)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = EGHT_CorporateDebtMember | (39)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = EGHT_CorporateDebtMember
Total available-for-sale investments, estimated fair value | 71,915 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = EGHT_CorporateDebtMember | 63,617 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = EGHT_CorporateDebtMember
Municipal Securities |  |
Amortized Cost Basis | 5,435 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = EGHT_MunicipalSecuritiesMember | 5,435 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = EGHT_MunicipalSecuritiesMember
Available-for-sale Securities, Gross Unrealized Gain | 3 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = EGHT_MunicipalSecuritiesMember | 5 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = EGHT_MunicipalSecuritiesMember
Gross Unrealized Losses | (7)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = EGHT_MunicipalSecuritiesMember | (1)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = EGHT_MunicipalSecuritiesMember
Total available-for-sale investments, estimated fair value | 5,431 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = EGHT_MunicipalSecuritiesMember | 5,439 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = EGHT_MunicipalSecuritiesMember
Asset Backed Securities |  |
Amortized Cost Basis | 23,598 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember | 17,049 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember
Available-for-sale Securities, Gross Unrealized Gain | 2 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember | 6 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember
Gross Unrealized Losses | (6)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember | (1)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember
Total available-for-sale investments, estimated fair value | 23,594 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember | 17,054 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember
Mortgage Backed Securities |  |
Amortized Cost Basis | 6,583 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember |
Available-for-sale Securities, Gross Unrealized Gain | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember |
Gross Unrealized Losses | (56)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember |
Total available-for-sale investments, estimated fair value | 6,527 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MortgageBackedSecuritiesMember |
Internatinal Government Securities |  |
Amortized Cost Basis | 800 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = EGHT_InternatinalGovernmentSecuritiesMember | 800 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = EGHT_InternatinalGovernmentSecuritiesMember
Available-for-sale Securities, Gross Unrealized Gain | 2 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = EGHT_InternatinalGovernmentSecuritiesMember | 4 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = EGHT_InternatinalGovernmentSecuritiesMember
Gross Unrealized Losses | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = EGHT_InternatinalGovernmentSecuritiesMember | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = EGHT_InternatinalGovernmentSecuritiesMember
Total available-for-sale investments, estimated fair value | 802 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = EGHT_InternatinalGovernmentSecuritiesMember | 804 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = EGHT_InternatinalGovernmentSecuritiesMember
Certificates of Deposit |  |
Amortized Cost Basis | 2,200 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember |
Available-for-sale Securities, Gross Unrealized Gain | 0 us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember |
Gross Unrealized Losses | (1)us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember |
Total available-for-sale investments, estimated fair value | $ 2,199 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember |

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