<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Version>2.4.0.6</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>109</ContextCount>
  <ElementCount>181</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>38</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0110 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/BalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0111 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/BalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0120 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/StatementsOfOperations</Role>
      <ShortName>Condensed Consolidated Statements of Operations (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0130 - Statement - Condensed Consolidated Statements of Comprehensive Loss (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/StatementsOfComprehensiveLoss</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Loss (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0140 - Statement - Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/StatementOfChangesInStockholdersEquity</Role>
      <ShortName>Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0150 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/StatementsOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0201 - Disclosure - Organization and Nature of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/OrganizationAndNatureOfOperations</Role>
      <ShortName>Organization and Nature of Operations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0202 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/SummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0203 - Disclosure - Fair Value of Financial Assets and Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/FairValueOfFinancialAssetsAndLiabilities</Role>
      <ShortName>Fair Value of Financial Assets and Liabilities</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0204 - Disclosure - Business Combinations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/BusinessCombinations</Role>
      <ShortName>Business Combinations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0205 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0206 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0207 - Disclosure - Loss Per Share Applicable to Common Stockholders</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/LossPerShareApplicableToCommonStockholders</Role>
      <ShortName>Loss Per Share Applicable to Common Stockholders</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0208 - Disclosure - Common Stock</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/CommonStock</Role>
      <ShortName>Common Stock</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0209 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0402 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/SummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0503 - Disclosure - Fair Value of Financial Assets and Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/FairValueOfFinancialAssetsAndLiabilitiesTables</Role>
      <ShortName>Fair Value of Financial Assets and Liabilities (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0504 - Disclosure - Business Combinations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/BusinessCombinationsTables</Role>
      <ShortName>Business Combinations (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>0507 - Disclosure - Loss Per Share Applicable to Common Stockholders (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/LossPerShareApplicableToCommonStockholdersTables</Role>
      <ShortName>Loss Per Share Applicable to Common Stockholders (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>0603 - Disclosure - Fair Value of Financial Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/FairValueOfFinancialAssetsAndLiabilitiesDetails</Role>
      <ShortName>Fair Value of Financial Assets and Liabilities (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>06031 - Disclosure - Fair Value of Financial Assets and Liabilities (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/FairValueOfFinancialAssetsAndLiabilitiesDetails1</Role>
      <ShortName>Fair Value of Financial Assets and Liabilities (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>06032 - Disclosure - Fair Value of Financial Assets and Liabilities (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/FairValueOfFinancialAssetsAndLiabilitiesDetails2</Role>
      <ShortName>Fair Value of Financial Assets and Liabilities (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>0604 - Disclosure - Business Combinations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/BusinessCombinationsDetails</Role>
      <ShortName>Business Combinations (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>06041 - Disclosure - Business Combinations (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/BusinessCombinationsDetails1</Role>
      <ShortName>Business Combinations (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>06042 - Disclosure - Business Combinations (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/BusinessCombinationsDetails2</Role>
      <ShortName>Business Combinations (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>06043 - Disclosure - Business Combinations (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/BusinessCombinationsDetailsTextual</Role>
      <ShortName>Business Combinations (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>0605 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>0606 - Disclosure - Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/DebtDetails</Role>
      <ShortName>Debt (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>0607 - Disclosure - Loss Per Share Applicable to Common Stockholders (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/LossPerShareApplicableToCommonStockholdersDetails</Role>
      <ShortName>Loss Per Share Applicable to Common Stockholders (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>0608 - Disclosure - Common Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bazaarvoice.com/role/CommonStockDetails</Role>
      <ShortName>Common Stock (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Element us-gaap_AmortizationOfAcquiredIntangibleAssets had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_EffectiveIncomeTaxRateContinuingOperations had a mix of decimals attribute values: 2 4.</Log>
    <Log type="Info">Element us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity had a mix of decimals attribute values: -5 -4.</Log>
    <Log type="Info">Element us-gaap_ShareBasedCompensation had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">'Monetary' elements on report '06043 - Disclosure - Business Combinations (Details Textual)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 0110 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Jul. 31, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Apr. 30, 2011'</Log>
    <Log type="Info">Process Flow-Through: 0111 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0120 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0130 - Statement - Condensed Consolidated Statements of Comprehensive Loss (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0150 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</Log>
  </Logs>
  <InputFiles>
    <File>bv-20120731.xml</File>
    <File>bv-20120731.xsd</File>
    <File>bv-20120731_cal.xml</File>
    <File>bv-20120731_def.xml</File>
    <File>bv-20120731_lab.xml</File>
    <File>bv-20120731_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
