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Repurchases of Common Shares (Detail) (USD $) | 12 Months Ended
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Mar. 31, 2015
Number of Shares | 2,488,215 us-gaap_StockRedeemedOrCalledDuringPeriodShares |
Amount | $ 19,200,393 us-gaap_StockRedeemedOrCalledDuringPeriodValue | [1]
2014 Repurchase Plan |  |
Number of Shares | 1,913,748 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = EGHT_RepurchasePlan2014Member |
Weighted Average Price Per Share | $ 7.82 EGHT_StockSharesRepurchasedDuringPeriodWeightedAveragePrice / us-gaap_StatementClassOfStockAxis = EGHT_RepurchasePlan2014Member |
Amount | 14,961,177 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = EGHT_RepurchasePlan2014Member | [1]
2015 Repurchase Plan |  |
Number of Shares | 574,467 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = EGHT_RepurchasePlan2015Member |
Weighted Average Price Per Share | $ 7.38 EGHT_StockSharesRepurchasedDuringPeriodWeightedAveragePrice / us-gaap_StatementClassOfStockAxis = EGHT_RepurchasePlan2015Member |
Amount | $ 4,239,216 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = EGHT_RepurchasePlan2015Member | [1]
[1] | Amount excludes commission fees.

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | EGHT_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Equity impact of the value of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Details
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Period Type: |