Significant Accounting Policies Service and Product Revenue (Narrative) (Details)	Mar. 31, 2017
Significant Accounting Policies Service And Product Revenue Narrative Details
Trial period offered with all new services, days	30

Trial period offered with all new services, in days

No definition available.

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