<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.21.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>325</ContextCount>
  <ElementCount>465</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>81</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>5</UnitCount>
  <MyReports>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>000002 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>000003 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>000004 - Statement - Consolidated Statements of Operations and Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Operations and Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>000005 - Statement - Consolidated Statement of Shareholders Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/ConsolidatedStatementOfShareholdersEquity</Role>
      <ShortName>Consolidated Statement of Shareholders Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>000006 - Statement - Consolidated Statements of Cash Flow</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/ConsolidatedStatementsOfCashFlow</Role>
      <ShortName>Consolidated Statements of Cash Flow</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>000007 - Disclosure - NATURE OF BUSINESS AND BASIS OF PRESENTATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/NatureOfBusinessAndBasisOfPresentation</Role>
      <ShortName>NATURE OF BUSINESS AND BASIS OF PRESENTATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>000008 - Disclosure - SUMMARY OF ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/SummaryOfAccountingPolicies</Role>
      <ShortName>SUMMARY OF ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>000009 - Disclosure - ACCOUNTS RECEIVABLE, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/AccountsReceivableNet</Role>
      <ShortName>ACCOUNTS RECEIVABLE, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>000010 - Disclosure - ACCOUNTS RECEIVABLE - RELATED PARTY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/AccountsReceivableRelatedParty</Role>
      <ShortName>ACCOUNTS RECEIVABLE - RELATED PARTY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>000011 - Disclosure - PREPAID EXPENSES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/PrepaidExpenses</Role>
      <ShortName>PREPAID EXPENSES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>000012 - Disclosure - SHORT-TERM DEPOSITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/ShortTermDeposits</Role>
      <ShortName>SHORT-TERM DEPOSITS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>000013 - Disclosure - CUSTOMER DEPOSITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/CustomerDeposits</Role>
      <ShortName>CUSTOMER DEPOSITS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>000014 - Disclosure - ASSET ACQUISITION - RELATED PARTY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/AssetAcquisitionRelatedParty</Role>
      <ShortName>ASSET ACQUISITION - RELATED PARTY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>000015 - Disclosure - INTANGIBLE ASSETS - SOFTWARE PLATFORM</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/IntangibleAssetsSoftwarePlatform</Role>
      <ShortName>INTANGIBLE ASSETS - SOFTWARE PLATFORM</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>000016 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/RelatedPartyTransactions</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>000017 - Disclosure - EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/EQUITY</Role>
      <ShortName>EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>000018 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/IncomeTaxes</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>000019 - Disclosure - CONCENTRATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/CONCENTRATIONS</Role>
      <ShortName>CONCENTRATIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>000020 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/CommitmentsAndContingencies</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>000021 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/SubsequentEvents</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>000022 - Disclosure - SUMMARY OF ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/SummaryOfAccountingPoliciesPolicies</Role>
      <ShortName>SUMMARY OF ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>000023 - Disclosure - SUMMARY OF ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/SummaryOfAccountingPoliciesTables</Role>
      <ShortName>SUMMARY OF ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://gmgi.com/role/SummaryOfAccountingPolicies</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>000024 - Disclosure - ASSET ACQUISITION - RELATED PARTY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/AssetAcquisitionRelatedPartyTables</Role>
      <ShortName>ASSET ACQUISITION - RELATED PARTY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://gmgi.com/role/AssetAcquisitionRelatedParty</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>000025 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/IncomeTaxesTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://gmgi.com/role/IncomeTaxes</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>000026 - Disclosure - NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/NatureOfBusinessAndBasisOfPresentationDetailsNarrative</Role>
      <ShortName>NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/NatureOfBusinessAndBasisOfPresentation</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>000027 - Disclosure - SUMMARY OF ACCOUNTING POLICIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/SummaryOfAccountingPoliciesDetails</Role>
      <ShortName>SUMMARY OF ACCOUNTING POLICIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/SummaryOfAccountingPoliciesTables</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>000028 - Disclosure - SUMMARY OF ACCOUNTING POLICIES (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/SummaryOfAccountingPoliciesDetailsNarrative</Role>
      <ShortName>SUMMARY OF ACCOUNTING POLICIES (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/SummaryOfAccountingPoliciesTables</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>000029 - Disclosure - ACCOUNTS RECEIVABLE, NET (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/AccountsReceivableNetDetailsNarrative</Role>
      <ShortName>ACCOUNTS RECEIVABLE, NET (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/AccountsReceivableNet</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>000030 - Disclosure - ACCOUNTS RECEIVABLE RELATED PARTY (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/AccountsReceivableRelatedPartyDetailsNarrative</Role>
      <ShortName>ACCOUNTS RECEIVABLE RELATED PARTY (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>000031 - Disclosure - PREPAID EXPENSES (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/PrepaidExpensesDetailsNarrative</Role>
      <ShortName>PREPAID EXPENSES (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/PrepaidExpenses</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>000032 - Disclosure - SHORT-TERM DEPOSITS (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/ShortTermDepositsDetailsNarrative</Role>
      <ShortName>SHORT-TERM DEPOSITS (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/ShortTermDeposits</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>000033 - Disclosure - CUSTOMER DEPOSIT (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/CustomerDepositDetailsNarrative</Role>
      <ShortName>CUSTOMER DEPOSIT (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/CustomerDeposits</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>000034 - Disclosure - ASSET ACQUISITION RELATED PARTY (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/AssetAcquisitionRelatedPartyDetails</Role>
      <ShortName>ASSET ACQUISITION RELATED PARTY (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>000035 - Disclosure - ASSET ACQUISITION RELATED PARTY (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/AssetAcquisitionRelatedPartyDetailsNarrative</Role>
      <ShortName>ASSET ACQUISITION RELATED PARTY (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>000036 - Disclosure - INTANGIBLE ASSETS - SOFTWARE PLATFORM (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/IntangibleAssetsSoftwarePlatformDetailsNarrative</Role>
      <ShortName>INTANGIBLE ASSETS - SOFTWARE PLATFORM (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/IntangibleAssetsSoftwarePlatform</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>000037 - Disclosure - RELATED PARTY TRANSACTIONS (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/RelatedPartyTransactionsDetailsNarrative</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/RelatedPartyTransactions</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>000038 - Disclosure - EQUITY (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/EquityDetailsNarrative</Role>
      <ShortName>EQUITY (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/EQUITY</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>000039 - Disclosure - INCOME TAXES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/IncomeTaxesDetails</Role>
      <ShortName>INCOME TAXES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/IncomeTaxesTables</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>000040 - Disclosure - INCOME TAXES (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/IncomeTaxesDetails1</Role>
      <ShortName>INCOME TAXES (Details 1)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/IncomeTaxesTables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>000041 - Disclosure - INCOME TAXES (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/IncomeTaxesDetailsNarrative</Role>
      <ShortName>INCOME TAXES (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/IncomeTaxesTables</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>000042 - Disclosure - CONCENTRATION (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/ConcentrationDetailsNarrative</Role>
      <ShortName>CONCENTRATION (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/CONCENTRATIONS</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>000043 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/CommitmentsAndContingenciesDetailsNarrative</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/CommitmentsAndContingencies</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="gmgi_10kt.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>000044 - Disclosure - SUBSEQUENT EVENTS (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://gmgi.com/role/SubsequentEventsDetailsNarrative</Role>
      <ShortName>SUBSEQUENT EVENTS (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://gmgi.com/role/SubsequentEvents</ParentRole>
      <Position>44</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-KT" original="gmgi_10kt.htm">gmgi_10kt.htm</File>
    <File>gmgi-20211031.xsd</File>
    <File>gmgi-20211031_cal.xml</File>
    <File>gmgi-20211031_def.xml</File>
    <File>gmgi-20211031_lab.xml</File>
    <File>gmgi-20211031_pre.xml</File>
    <File>gmgi_ex211.htm</File>
    <File>gmgi_ex231.htm</File>
    <File>gmgi_ex311.htm</File>
    <File>gmgi_ex312.htm</File>
    <File>gmgi_ex321.htm</File>
    <File>gmgi_ex322.htm</File>
    <File>gmgi_ex42.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>gmgi_10ktimg1.jpg</File>
    <File>gmgi_10ktimg2.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2020-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
