Commitments and Contingencies (CustomerSupport Commitments) (Narrative) (Details) $ in Millions	Dec. 31, 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

Third Part yCustomer Support Vendor Minimum Monthly Commitment

No definition available.

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