<?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>2.2.0.25</Version>
  <ReportType />
  <MyReports>
    <Report>
      <IsDefault>true</IsDefault>
      <ReportType>Sheet</ReportType>
      <LongName>00101 - Document - Document And Entity Information {Elements}</LongName>
      <ShortName>Document And Entity Information</ShortName>
      <Role>http://www.dreyfus.com/role/DocumentDocumentandEntityInformation</Role>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <XmlFileName>R1.xml</XmlFileName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ReportType>Sheet</ReportType>
      <LongName>01102 - Document - Risk/Return Summary {Unlabeled} (Dreyfus Equity Growth Fund)</LongName>
      <ShortName>Risk/Return Summary  (Dreyfus Equity Growth Fund)</ShortName>
      <Role>http://www.dreyfus.com/role/RiskReturn_S000000568Member</Role>
      <ContainEmbeddedReports>true</ContainEmbeddedReports>
      <XmlFileName>R2.xml</XmlFileName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ReportType>Sheet</ReportType>
      <LongName>040000 - Disclosure - Risk/Return Detail Data {Elements}</LongName>
      <ShortName>Risk/Return Detail Data</ShortName>
      <Role>http://xbrl.sec.gov/rr/role/RiskReturnDetailData</Role>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <XmlFileName>R9.xml</XmlFileName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ReportType>Sheet</ReportType>
      <LongName>06110 - Document - Risk/Return Summary {Unlabeled} (Dreyfus Mid-Cap Growth Fund)</LongName>
      <ShortName>Risk/Return Summary  (Dreyfus Mid-Cap Growth Fund)</ShortName>
      <Role>http://www.dreyfus.com/role/RiskReturn_S000000571Member</Role>
      <ContainEmbeddedReports>true</ContainEmbeddedReports>
      <XmlFileName>R10.xml</XmlFileName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ReportType>Sheet</ReportType>
      <LongName>06117 - Disclosure - Risk/Return Detail Data {Elements} (Dreyfus Mid-Cap Growth Fund)</LongName>
      <ShortName>Risk/Return Detail Data  (Dreyfus Mid-Cap Growth Fund)</ShortName>
      <Role>http://www.dreyfus.com/role/RiskReturnDetailData_S000000571Member</Role>
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <XmlFileName>R17.xml</XmlFileName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <ReportType>Book</ReportType>
      <LongName>All Reports</LongName>
      <ShortName>All Reports</ShortName>
      <Role />
      <ContainEmbeddedReports>false</ContainEmbeddedReports>
      <XmlFileName />
    </Report>
  </MyReports>
  <EntityCount>1</EntityCount>
  <ContextCount>29</ContextCount>
  <SegmentCount>18</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <UnitCount>2</UnitCount>
  <ElementCount>85</ElementCount>
  <FootnotesReported>false</FootnotesReported>
  <TuplesReported>false</TuplesReported>
  <ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_396840x-9992184_429423x-9992195</ContextName>
      <ElementCount>1</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_429423x-9992188_429555x429483</ContextName>
      <ElementCount>5</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_396840x-9992184_429423x-9992196</ContextName>
      <ElementCount>1</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_396840x-9992183_429423x-9992191</ContextName>
      <ElementCount>1</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_429423x-9992188</ContextName>
      <ElementCount>29</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_396840x-9992184</ContextName>
      <ElementCount>41</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_429423x-9992187</ContextName>
      <ElementCount>19</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_396840x-9992183</ContextName>
      <ElementCount>41</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_429555x-9998778</ContextName>
      <ElementCount>4</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_429423x-9992188_429555x429511</ContextName>
      <ElementCount>5</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_396840x-9992183_429423x-9992190</ContextName>
      <ElementCount>1</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_429423x-9992193_429555x429511</ContextName>
      <ElementCount>5</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_429423x-9992193</ContextName>
      <ElementCount>29</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_429423x-9992189</ContextName>
      <ElementCount>19</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_396840x-9992183_429423x-9992188</ContextName>
      <ElementCount>7</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0</ContextName>
      <ElementCount>8</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_429423x-9992194</ContextName>
      <ElementCount>19</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_396840x-9992183_429423x-9992189</ContextName>
      <ElementCount>1</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_429423x-9992190</ContextName>
      <ElementCount>19</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_429423x-9992193_429555x429483</ContextName>
      <ElementCount>5</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_429423x-9992195</ContextName>
      <ElementCount>19</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_429555x-9998694</ContextName>
      <ElementCount>4</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_429423x-9992192</ContextName>
      <ElementCount>19</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_396840x-9992184_429423x-9992192</ContextName>
      <ElementCount>1</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_396840x-9992183_429423x-9992187</ContextName>
      <ElementCount>1</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_396840x-9992184_429423x-9992194</ContextName>
      <ElementCount>1</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992185_429423x-9992191</ContextName>
      <ElementCount>19</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_396840x-9992184_429423x-9992193</ContextName>
      <ElementCount>7</ElementCount>
    </ContextSummary>
    <ContextSummary>
      <ContextName>eol_0000038403-11-000007_STD_1_20110501_0_396770x-9992186_429423x-9992196</ContextName>
      <ElementCount>19</ElementCount>
    </ContextSummary>
  </ContextSummary>
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
