Commitments and Contingencies (CustomerSupport Commitments) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Commitments And Contingencies Customersupport Commitments Narrative Details
Third party customer support vendor minimum monthly commitment	$ 0.4
Third party customer support vendor maximum obligation	2.2
Advance termination notice required, days	150
Property and equipment under capital lease	0.5us-gaap_CapitalLeasedAssetsGross	0.6us-gaap_CapitalLeasedAssetsGross
Accumulated depreciation related to assets under capital lease	$ 0.3	$ 0.4

The number of advance termination notice days required

No definition available.

Name:	EGHT_AdvanceTerminationNoticeRequiredDays
Namespace Prefix:	EGHT_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	EGHT_CommitmentsAndContingenciesCustomersupportCommitmentsNarrativeDetailsAbstract
Namespace Prefix:	EGHT_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Third Party Customer Suppor tVendor Maximum Obligation

+ References

No definition available.

+ Details

Name:	EGHT_ThirdPartyCustomerSupportVendorMaximumObligation
Namespace Prefix:	EGHT_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Third Part yCustomer Support Vendor Minimum Monthly Commitment

+ References

No definition available.

+ Details

Name:	EGHT_ThirdPartyCustomerSupportVendorMinimumMonthlyCommitment
Namespace Prefix:	EGHT_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

+ Details

Name:	us-gaap_CapitalLeasedAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 2)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

+ Details

Name:	us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant