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Basis of Presentation (Stock Option Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Stock-based compensation expense |  |  | $ 6,489,000 us-gaap_ShareBasedCompensation | $ 5,245,000 us-gaap_ShareBasedCompensation
Stock-Based Awards |  |  |  |
Unamortized stock-based compensation expense related to unvested stock awards | 24,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  | 24,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
Weighted average period of recognition for unrecognized compensation costs (in years) |  |  | 2 years 339 days |
Tax benefit attributable to stock options exercised |  |  | 0 EGHT_TaxBenefitAttributableToStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 0 EGHT_TaxBenefitAttributableToStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Stock-based compensation expense | 2,400,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 2,100,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 5,800,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 4,800,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Employee Stock Purchase Plan |  |  |  |
Unamortized stock-based compensation expense related to unvested stock awards | 200,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  | 200,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
Weighted average period of recognition for unrecognized compensation costs (in years) |  |  | 0 years 6 months |
Tax benefit attributable to stock options exercised |  |  | 0 EGHT_TaxBenefitAttributableToStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember | 0 EGHT_TaxBenefitAttributableToStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember
Percentage of market value price of common stock under Employee Stock Purchase Plan | 85.00%EGHT_PercentageOfMarketValuePriceOfCommonStockUnderEmployeeStockPurchasePlan / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  | 85.00%EGHT_PercentageOfMarketValuePriceOfCommonStockUnderEmployeeStockPurchasePlan / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
Maximum contribution percentage amount of employee's base compensation | 10.00%EGHT_MaximumContributionPercentageAmountOfEmployeesBaseCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  | 10.00%EGHT_MaximumContributionPercentageAmountOfEmployeesBaseCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
Stock-based compensation expense | $ 200,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember | $ 100,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember | $ 700,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember | $ 400,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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