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Income taxes (Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014
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Current deferred tax assets |  |
Net operating loss carryforwards | $ 2,179 EGHT_DeferredTaxAssetsOperatingLossCarryforwardsCurrent | $ 333 EGHT_DeferredTaxAssetsOperatingLossCarryforwardsCurrent
Inventory valuation | 14 us-gaap_DeferredTaxAssetsInventory | 33 us-gaap_DeferredTaxAssetsInventory
Reserves and allowances | 2,394 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances | 1,791 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances
Net current deferred tax assets | 4,587 us-gaap_DeferredTaxAssetsGrossCurrent | 2,157 us-gaap_DeferredTaxAssetsGrossCurrent
Net operating loss carryforwards | 44,228 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 51,598 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development and other credit carryforwards | 5,414 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch | 4,488 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Fixed assets and intangibles | (1,705)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (2,819)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Net non-current deferred tax assets | 47,937 us-gaap_DeferredTaxAssetsGrossNoncurrent | 53,267 us-gaap_DeferredTaxAssetsGrossNoncurrent
Valuation allowance | (4,901)us-gaap_DeferredTaxAssetsValuationAllowance | (5,562)us-gaap_DeferredTaxAssetsValuationAllowance
Total | $ 47,623 us-gaap_DeferredTaxAssetsNet | $ 49,862 us-gaap_DeferredTaxAssetsNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31938-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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