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Commitments and Contingencies (CustomerSupport Commitments) (Narrative) (Details) $ in Millions	Jun. 30, 2016 USD ($)
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	$ 1.6
Accumulated depreciation related to assets under capital lease	$ 0.6

X

- Definition

The number of advance termination notice days required

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- 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

X

- 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

X

- Definition

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

+ 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

+ Details

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

X

- 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

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