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Income Taxes (Reconciliation of Taxes Provided to Federal Statutory Rate) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Income Taxes Reconciliation Of Taxes Provided To Federal Statutory Rate Details |  |  |  |  |  |  |  |  |  |  |  |  |
Tax provision at statutory rate |  |  |  |  |  |  |  |  |  |  | $ 1,599 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 1,285 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 7,768 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes before valuation allowance, net of federal effect |  |  |  |  |  |  |  |  |  |  | 269 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 196 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 822 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Research and development credits |  |  |  |  |  |  |  |  |  |  | (725)us-gaap_IncomeTaxReconciliationTaxCreditsResearch | (1,534)us-gaap_IncomeTaxReconciliationTaxCreditsResearch | (385)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Change in valuation allowance |  |  |  |  |  |  |  |  |  |  | (1,480)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 1,264 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 1,038 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Compensation/option differences |  |  |  |  |  |  |  |  |  |  | (331)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | (264)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | (207)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Non-deductible compensation |  |  |  |  |  |  |  |  |  |  | 746 us-gaap_IncomeTaxReconciliationDeductionsOther | 605 us-gaap_IncomeTaxReconciliationDeductionsOther | 403 us-gaap_IncomeTaxReconciliationDeductionsOther
Acquisition costs |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeTaxReconciliationDeductions | 230 us-gaap_IncomeTaxReconciliationDeductions | 0 us-gaap_IncomeTaxReconciliationDeductions
Expiring CA NOLs |  |  |  |  |  |  |  |  |  |  | 1,484 EGHT_ExpiringCaNols | 240 EGHT_ExpiringCaNols | 0 EGHT_ExpiringCaNols
Foreign loss not benefited |  |  |  |  |  |  |  |  |  |  | 1,192 us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations | 271 us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations | 0 us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Other |  |  |  |  |  |  |  |  |  |  | 35 us-gaap_IncomeTaxReconciliationOtherAdjustments | (74)us-gaap_IncomeTaxReconciliationOtherAdjustments | (40)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax provision | $ 79 us-gaap_IncomeTaxExpenseBenefit | [1] | $ 627 us-gaap_IncomeTaxExpenseBenefit | $ 1,411 us-gaap_IncomeTaxExpenseBenefit | $ 672 us-gaap_IncomeTaxExpenseBenefit | $ 1,738 us-gaap_IncomeTaxExpenseBenefit | [1] | $ (1,306)us-gaap_IncomeTaxExpenseBenefit | $ 826 us-gaap_IncomeTaxExpenseBenefit | $ 961 us-gaap_IncomeTaxExpenseBenefit | $ 2,789 us-gaap_IncomeTaxExpenseBenefit | $ 2,219 us-gaap_IncomeTaxExpenseBenefit | $ 9,399 us-gaap_IncomeTaxExpenseBenefit
[1] | Comparability affected by the decrease in fiscal 2015 and increase in fiscal 2014 in the valuation allowance related to the deferred tax asset which resulted in a decrease in fiscal 2015 and an increase in the provision for income taxes of $1.5 million and $1.3 million in the fourth quarter of fiscal 2015 and 2014, respectively.

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to expiring state net operating loss tax expense (benefit). + References No definition available. + Details
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- Definition Amount of current and deferred foreign income tax expense (benefit) attributable to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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