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Commitments and Contingencies (CustomerSupport Commitments) (Narrative) (Details) $ in Millions	Sep. 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

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