2.4.0.8146 - Disclosure - Estimated Useful Lives of Property Plant and Equipment (Detail)truefalsefalse1false falsefalseeol_PE677256--1310-K0007_STD_365_20130430_0_510903x513379http://www.sec.gov/CIK0001330421duration2012-05-01T00:00:002013-04-30T00:00:001false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse1false truefalseeol_PE677256--1310-K0007_STD_365_20130430_0_510903x513379http://www.sec.gov/CIK0001330421duration2012-05-01T00:00:002013-04-30T00:00:00falsefalseComputer Equipmentus-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ComputerEquipmentMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMembernanafalse0Computer Equipment2true 3bv_PropertyPlantAndEquipmentEstimatedUsefulLifesLineItemsbv_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Property Plant And Equipment Estimated Useful Lifes [Line Items]3false 4us-gaap_PropertyPlantAndEquipmentUsefulLifeus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse003 yearsfalsefalsefalsexbrli:durationItemTypenaUseful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.No definition available.false0Estimated useful life4false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2false truefalseeol_PE677256--1310-K0007_STD_365_20130430_0_510903x500372http://www.sec.gov/CIK0001330421duration2012-05-01T00:00:002013-04-30T00:00:00falsefalseFurniture and Fixturesus-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FurnitureAndFixturesMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMembernanafalse0Furniture and Fixtures5true 3bv_PropertyPlantAndEquipmentEstimatedUsefulLifesLineItemsbv_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Property Plant And Equipment Estimated Useful Lifes [Line Items]6false 4us-gaap_PropertyPlantAndEquipmentUsefulLifeus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse005 yearsfalsefalsefalsexbrli:durationItemTypenaUseful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. 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Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.No definition available.false0Estimated useful life13false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse5false truefalseeol_PE677256--1310-K0007_STD_365_20130430_0_510903x498304http://www.sec.gov/CIK0001330421duration2012-05-01T00:00:002013-04-30T00:00:00falsefalseLeasehold Improvementsus-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_LeaseholdImprovementsMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMembernanafalse0Leasehold Improvements14true 3bv_PropertyPlantAndEquipmentEstimatedUsefulLifesLineItemsbv_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Property Plant And Equipment Estimated Useful Lifes [Line Items]15false 4us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLivesus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00Shorter of estimated useful life or the lease termfalsefalsefalsexbrli:stringItemTypestringDescribes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 false0Estimated useful lifefalseEstimated Useful Lives of Property Plant and Equipment (Detail)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.bazaarvoice.com/taxonomy/role/DisclosureEstimatedUsefulLivesOfPropertyPlantAndEquipment115