<?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>162</ContextCount>
  <ElementCount>220</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>45</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000990 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001000 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/CondensedConsolidatedBalanceSheetsUnaudited</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002000 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/CondensedConsolidatedStatementsOfOperationsUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Operations (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003000 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>006010 - Disclosure - Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/BasisOfPresentation</Role>
      <ShortName>Basis of Presentation</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>006020 - Disclosure - Acquisition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/Acquisition</Role>
      <ShortName>Acquisition</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006030 - Disclosure - Financing Receivables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/FinancingReceivables</Role>
      <ShortName>Financing Receivables</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>006040 - Disclosure - Foreign Currency Transactions and Derivatives</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/ForeignCurrencyTransactionsAndDerivatives</Role>
      <ShortName>Foreign Currency Transactions and Derivatives</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>006050 - Disclosure - Fair Value of Assets and Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/FairValueOfAssetsAndLiabilities</Role>
      <ShortName>Fair Value of Assets and Liabilities</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>006060 - Disclosure - Computation of Earnings per Common Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/ComputationOfEarningsPerCommonShare</Role>
      <ShortName>Computation of Earnings per Common Share</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>006070 - Disclosure - Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/ComprehensiveIncome</Role>
      <ShortName>Comprehensive Income</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>006080 - Disclosure - Stock Benefit Plans and Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/StockBenefitPlansAndStockBasedCompensation</Role>
      <ShortName>Stock Benefit Plans and Stock-Based Compensation</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>006090 - Disclosure - Goodwill, Capitalized Software and Other Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/GoodwillCapitalizedSoftwareAndOtherIntangibleAssets</Role>
      <ShortName>Goodwill, Capitalized Software and Other Intangible Assets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>006100 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>006110 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>006120 - Disclosure - Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/Contingencies</Role>
      <ShortName>Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>007010 - Disclosure - Basis of Presentation (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/BasisOfPresentationPolicies</Role>
      <ShortName>Basis of Presentation (Policies)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>008030 - Disclosure - Financing Receivables (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/FinancingReceivablesTables</Role>
      <ShortName>Financing Receivables (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>008050 - Disclosure - Fair Value of Assets and Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/FairValueOfAssetsAndLiabilitiesTables</Role>
      <ShortName>Fair Value of Assets and Liabilities (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>008060 - Disclosure - Computation of Earnings per Common Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/ComputationOfEarningsPerCommonShareTables</Role>
      <ShortName>Computation of Earnings per Common Share (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>008070 - Disclosure - Comprehensive Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/ComprehensiveIncomeTables</Role>
      <ShortName>Comprehensive Income (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>008080 - Disclosure - Stock Benefit Plans and Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/StockBenefitPlansAndStockBasedCompensationTables</Role>
      <ShortName>Stock Benefit Plans and Stock-Based Compensation (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>008090 - Disclosure - Goodwill, Capitalized Software and Other Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/GoodwillCapitalizedSoftwareAndOtherIntangibleAssetsTables</Role>
      <ShortName>Goodwill, Capitalized Software and Other Intangible Assets (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>008100 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/SegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>009010 - Disclosure - Basis of Presentation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/BasisOfPresentationDetails</Role>
      <ShortName>Basis of Presentation (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>009020 - Disclosure - Acquisition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/AcquisitionDetails</Role>
      <ShortName>Acquisition (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>009030 - Disclosure - Financing Receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/FinancingReceivablesDetails</Role>
      <ShortName>Financing Receivables (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>009040 - Disclosure - Foreign Currency Transactions and Derivatives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/ForeignCurrencyTransactionsAndDerivativesDetails</Role>
      <ShortName>Foreign Currency Transactions and Derivatives (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>009050 - Disclosure - Fair Value of Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/FairValueOfAssetsAndLiabilitiesDetails</Role>
      <ShortName>Fair Value of Assets and Liabilities (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>009060 - Disclosure - Computation of Earnings per Common Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/ComputationOfEarningsPerCommonShareDetails</Role>
      <ShortName>Computation of Earnings per Common Share (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>009070 - Disclosure - Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/ComprehensiveIncomeDetails</Role>
      <ShortName>Comprehensive Income (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>009080 - Disclosure - Stock Benefit Plans and Stock-Based Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/StockBenefitPlansAndStockBasedCompensationDetails</Role>
      <ShortName>Stock Benefit Plans and Stock-Based Compensation (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>009090 - Disclosure - Goodwill, Capitalized Software and Other Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/GoodwillCapitalizedSoftwareAndOtherIntangibleAssetsDetails</Role>
      <ShortName>Goodwill, Capitalized Software and Other Intangible Assets (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>009100 - Disclosure - Segment Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/SegmentInformationDetails</Role>
      <ShortName>Segment Information (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>009101 - Disclosure - Segment Information, Geographic operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/SegmentInformationGeographicOperationsDetails</Role>
      <ShortName>Segment Information, Geographic operations (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>009110 - Disclosure - Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://compuware.com/role/DebtDetails</Role>
      <ShortName>Debt (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_AcquiredFiniteLivedIntangibleAssetAmount had a mix of decimals attribute values: -6 -5.</Log>
    <Log type="Info">Element us-gaap_ForeignCurrencyTransactionGainLossBeforeTax had a mix of decimals attribute values: -5 0.</Log>
    <Log type="Info">Element us-gaap_InterestPaid had a mix of decimals attribute values: -6 -3.</Log>
    <Log type="Info">Element us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">'Monetary' elements on report '009020 - Disclosure - Acquisition (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '009030 - Disclosure - Financing Receivables (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Shares' elements on report '009060 - Disclosure - Computation of Earnings per Common Share (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Shares' elements on report '009080 - Disclosure - Stock Benefit Plans and Stock-Based Compensation (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '009080 - Disclosure - Stock Benefit Plans and Stock-Based Compensation (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '009090 - Disclosure - Goodwill, Capitalized Software and Other Intangible Assets (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '009110 - Disclosure - Debt (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 001000 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Mar. 31, 2010'</Log>
    <Log type="Info">Process Flow-Through: 002000 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 003000 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</Log>
  </Logs>
  <InputFiles>
    <File>cpwr-20111231.xml</File>
    <File>cpwr-20111231.xsd</File>
    <File>cpwr-20111231_cal.xml</File>
    <File>cpwr-20111231_def.xml</File>
    <File>cpwr-20111231_lab.xml</File>
    <File>cpwr-20111231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
