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Basis of Presentation (Schedule Of Option Activity) (Details) (USD $) | 9 Months Ended
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Dec. 31, 2014
Basis Of Presentation Schedule Of Option Activity Details |  |
Balance at March 31, 2014 | 6,002,382 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
Granted - options | 992,764 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |
Exercised | (1,041,982)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |
Cancelled/forfeited | (392,076)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod |
Balance at December 31, 2014 | 5,561,088 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
Shares available for grant at March 31, 2014 | 1,613,943 EGHT_SharesAvailableForGrant |
Additional shares authorized for grant | 8,000,000 EGHT_StockPurchaseRightsSharesAvailableForGrant |
Granted options, shares available for grant (1) | (1,295,906)EGHT_GrantedSharesAvailableForGrant | [1]
Stock purchase rights/restricted stock unit (2) | (1,880,732)EGHT_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockPurchaseRightsGrantsInPeriod | [2]
Exercised | 0 EGHT_ExercisedSharesAvailableForGrant |
Cancelled/forfeited shares available for grant | 392,076 EGHT_CancelledforfeitedSharesAvailableForGrant |
Cancelled/forfeited - restricted stock units | 142,910 EGHT_CancelledforfeitedRestrictedStockUnits |
Shares available for grant, at December 31, 2014 | 6,972,291 EGHT_SharesAvailableForGrant |
Weighted-average exercise price of options outstanding, at March 31, 2014 | $ 4.14 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
Weighted-average exercise price of options granted during period | $ 7.09 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice |
Weighted-average exercise price of stock purchases rights during period | $ 0 EGHT_WeightedaverageExercisePriceOfStockPurchasesRightsDuringPeriod |
Weighted-average exercise price of options exercised during the period | $ 1.60 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice |
Weighted-average exercise price of options forfeited, cancelled or expired during the period | $ 5.74 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice |
Weighted-average exercise price of canceled / forfeited - restricted stock unit during period | $ 0 EGHT_WeightedaverageExercisePriceOfOptionsTerminationOfPlansDuringPeriod |
Weighted-average exercise price of options outstanding at December 31, 2014 | $ 5.03 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
[1] | (1) As reflected in the preceding table, for each share awarded as a stock option under the 2012 Amended and Restated Equity Incentive Plan, an equivalent of 1.5 shares were deducted from the shares available for grant balance.
[2] | (2) The reduction to shares available for grant includes awards granted of 1,880,732 shares

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