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Repurchases of Common Shares in Open Market (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Dec. 31, 2014 | Dec. 31, 2014
Repurchases Of Common Shares In Open Market Detail |  |
Number of Shares | 216,965 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 216,965 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Stock Repurchased And Retired During Period Weighted Average Price | $ 7.48 EGHT_StockRepurchasedAndRetiredDuringPeriodWeightedAveragePrice | $ 7.48 EGHT_StockRepurchasedAndRetiredDuringPeriodWeightedAveragePrice
Amount | $ 1,627,210 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ 1,627,210 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue

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- Details
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Period Type: | duration

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- Definition The weighted average price of the shares that have been repurchased and retired during the period. + References No definition available. + Details
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Namespace Prefix: | EGHT_
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Balance Type: | na
Period Type: | duration

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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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Period Type: | duration

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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration