<?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>97</ContextCount>
  <ElementCount>145</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>6</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>3</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>001 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>002 - Statement - Condensed Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/StatementOfFinancialPositionClassified</Role>
      <ShortName>Condensed Balance Sheets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>003 - Statement - Condensed Balance Sheets (Paranthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/CondensedConsolidatedBalanceSheetsParantheticals</Role>
      <ShortName>Condensed Balance Sheets (Paranthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>004 - Statement - Condensed Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/StatementOfIncome</Role>
      <ShortName>Condensed Statements of Operations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>005 - Statement - Condensed Statement of Changes in Stockholders' Equity/(Deficiency)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/StatementOfShareholdersEquityAndOtherComprehensiveIncome</Role>
      <ShortName>Condensed Statement of Changes in Stockholders' Equity/(Deficiency)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>006 - Statement - Condensed Statement of Changes in Stockholders' Equity/(Deficiency) (Parenthentical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/CondensedStatementOfChangesInStockholdersEquitydeficiencyParenthentical</Role>
      <ShortName>Condensed Statement of Changes in Stockholders' Equity/(Deficiency) (Parenthentical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>007 - Statement - Condensed Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/StatementOfCashFlowsIndirect</Role>
      <ShortName>Condensed Statements of Cash Flows</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>008 - Statement - Condensed Statements of Cash Flows (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/StatementsOfCashFlowsParenthetical</Role>
      <ShortName>Condensed Statements of Cash Flows (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>009 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND ORGANIZATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/SummaryOfSignificantAccountingPoliciesAndOrganization</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND ORGANIZATION</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>010 - Disclosure - EQUIPMENT AND INTANGIBLES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/EquipmentAndIntangibles</Role>
      <ShortName>EQUIPMENT AND INTANGIBLES</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>011 - Disclosure - STOCKHOLDERS' EQUITY/DEFICIENCY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/StockholdersEquitydeficiency</Role>
      <ShortName>STOCKHOLDERS' EQUITY/DEFICIENCY</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>012 - Disclosure - STOCK OPTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/StockOptions</Role>
      <ShortName>STOCK OPTIONS</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>013 - Disclosure - LOAN PAYABLE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/LoanPayable</Role>
      <ShortName>LOAN PAYABLE</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>014 - Disclosure - CONVERTIBLE LOAN PAYABLE - RELATED PARTY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/ConvertibleLoanPayableRelatedParty</Role>
      <ShortName>CONVERTIBLE LOAN PAYABLE - RELATED PARTY</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>015 - Disclosure - COMMITMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/Commitments</Role>
      <ShortName>COMMITMENTS</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>016 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/RelatedPartyTransactions</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>017 - Disclosure - BINDING LETTER OF INTENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/BindingLetterOfIntent</Role>
      <ShortName>BINDING LETTER OF INTENT</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>018 - Disclosure - SUBSEQUENT EVENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/SubsequentEvents</Role>
      <ShortName>SUBSEQUENT EVENT</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>019 - Disclosure - REVISION TO FINANCIAL STATEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nextfuels.com/role/REVISIONTOFINANCIALSTATEMENTS</Role>
      <ShortName>REVISION TO FINANCIAL STATEMENTS</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 nxfi_WeightedAverageNumberOfSharesOustandingBasicAndDiluted had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">Process Flow-Through: 002 - Statement - Condensed Balance Sheets</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2009'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2008'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2007'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Aug. 13, 2007'</Log>
    <Log type="Info">Process Flow-Through: 003 - Statement - Condensed Balance Sheets (Paranthetical)</Log>
    <Log type="Info">Process Flow-Through: 004 - Statement - Condensed Statements of Operations</Log>
    <Log type="Info">	Process Flow-Through: Removing column '2 Months Ended
Sep. 30, 2007'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '12 Months Ended
Sep. 30, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '12 Months Ended
Sep. 30, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '12 Months Ended
Sep. 30, 2009'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '12 Months Ended
Sep. 30, 2008'</Log>
    <Log type="Info">Process Flow-Through: 006 - Statement - Condensed Statement of Changes in Stockholders' Equity/(Deficiency) (Parenthentical)</Log>
    <Log type="Info">Process Flow-Through: 007 - Statement - Condensed Statements of Cash Flows</Log>
    <Log type="Info">Process Flow-Through: 008 - Statement - Condensed Statements of Cash Flows (Parenthetical)</Log>
  </Logs>
  <InputFiles>
    <File>nxfi-20120331.xml</File>
    <File>nxfi-20120331.xsd</File>
    <File>nxfi-20120331_cal.xml</File>
    <File>nxfi-20120331_def.xml</File>
    <File>nxfi-20120331_lab.xml</File>
    <File>nxfi-20120331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
