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Basis of Presentation (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax	$ 2,634us-gaap_AllocatedShareBasedCompensationExpense	$ 3,232us-gaap_AllocatedShareBasedCompensationExpense	$ 6,489us-gaap_AllocatedShareBasedCompensationExpense	$ 5,245us-gaap_AllocatedShareBasedCompensationExpense
Tax benefit	0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock-based employee compensation expense related to employee stock options and employee stock purchases, net of tax	2,634us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	3,232us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	6,489us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	5,245us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Cost of service revenue
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax	201us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = EGHT_CostOfServiceRevenuesMember	101us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = EGHT_CostOfServiceRevenuesMember	476us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = EGHT_CostOfServiceRevenuesMember	237us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = EGHT_CostOfServiceRevenuesMember
Cost of product revenue
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = EGHT_CostOfProductRevenuesMember	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = EGHT_CostOfProductRevenuesMember	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = EGHT_CostOfProductRevenuesMember	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = EGHT_CostOfProductRevenuesMember
Research and development
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax	420us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	339us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	1,049us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	634us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
Sales and marketing
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax	966us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	660us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	2,620us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	1,400us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember
General and administrative
Stock-based employee compensation expense related to employee stock options and employee stock purchases, pre tax	$ 1,047us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 2,132us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 2,344us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 2,974us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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