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Basis of Presentation (Schedule Of Restricted Stock Unit and Performance Stock Unit Activity) (Details) | 9 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Mar. 31, 2014
Basis Of Presentation Schedule Of Restricted Stock Unit And Performance Stock Unit Activity Details |  |
Balance at March 31, 2014 | 1,134,856 EGHT_RsuBalance |
Granted | 1,849,300 EGHT_RsuGranted |
Vested | (166,758)EGHT_RsuVested |
Forfeited | (141,600)EGHT_RsuForfeited |
Balance at December 31, 2014 | 2,675,798 EGHT_RsuBalance |
RSU Weighted-average remaining contractual term, in years |  | 2.00 EGHT_RsuWeightedaverageRemainingContractualTermInYears
RSU Weighted-average remaining contractual term, in years, end of period | 2.06 EGHT_RsuWeightedaverageRemainingContractualTermInYearsEndOfPeriod |

X
- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | EGHT_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | EGHT_RsuForfeited
Namespace Prefix: | EGHT_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | EGHT_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | EGHT_RsuVested
Namespace Prefix: | EGHT_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | EGHT_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | EGHT_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | EGHT_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration