<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.20.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>158</ContextCount>
  <ElementCount>434</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>57</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>00100 - Statement - BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/StatementBalanceSheets</Role>
      <ShortName>BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>00105 - Statement - BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/StatementBalanceSheetsParenthetical</Role>
      <ShortName>BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>00200 - Statement - STATEMENTS OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/StatementStatementsOfOperations</Role>
      <ShortName>STATEMENTS OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>00300 - Statement - STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/StatementStatementsOfChangesInStockholdersEquity</Role>
      <ShortName>STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>00305 - Statement - STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/StatementStatementsOfChangesInStockholdersEquityParenthetical</Role>
      <ShortName>STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>00400 - Statement - STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/StatementStatementsOfCashFlows</Role>
      <ShortName>STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>10101 - Disclosure - NATURE OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureNatureOfOperations</Role>
      <ShortName>NATURE OF OPERATIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>10201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>10301 - Disclosure - CONSUMER LOANS RECEIVABLE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureConsumerLoansReceivable</Role>
      <ShortName>CONSUMER LOANS RECEIVABLE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>10401 - Disclosure - NOTES RECEIVABLE FROM MOBILE HOME PARKS (MHP Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureNotesReceivableFromMobileHomeParksMhpNotes</Role>
      <ShortName>NOTES RECEIVABLE FROM MOBILE HOME PARKS (MHP Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>10501 - Disclosure - OTHER NOTES RECEIVABLE</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureOtherNotesReceivable</Role>
      <ShortName>OTHER NOTES RECEIVABLE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>10601 - Disclosure - INVENTORIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureInventories</Role>
      <ShortName>INVENTORIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>10701 - Disclosure - PROPERTY, PLANT AND EQUIPMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosurePropertyPlantAndEquipment</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>10801 - Disclosure - OTHER ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureOtherAssets</Role>
      <ShortName>OTHER ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>10901 - Disclosure - ACCRUED LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureAccruedLiabilities</Role>
      <ShortName>ACCRUED LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>11001 - Disclosure - DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureDebt</Role>
      <ShortName>DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>11101 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureIncomeTaxes</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>11201 - Disclosure - SHARE-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureShareBasedCompensation</Role>
      <ShortName>SHARE-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>11301 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureCommitmentsAndContingencies</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>11401 - Disclosure - DERIVATIVES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureDerivatives</Role>
      <ShortName>DERIVATIVES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>11501 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureEarningsPerShare</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>11601 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureRelatedPartyTransactions</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>11701 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSubsequentEvents</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>20202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>30203 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>30303 - Disclosure - CONSUMER LOANS RECEIVABLE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureConsumerLoansReceivableTables</Role>
      <ShortName>CONSUMER LOANS RECEIVABLE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureConsumerLoansReceivable</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>30503 - Disclosure - OTHER NOTES RECEIVABLE (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureOtherNotesReceivableTables</Role>
      <ShortName>OTHER NOTES RECEIVABLE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureOtherNotesReceivable</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>30603 - Disclosure - INVENTORIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureInventoriesTables</Role>
      <ShortName>INVENTORIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureInventories</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>30703 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosurePropertyPlantAndEquipmentTables</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosurePropertyPlantAndEquipment</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>30803 - Disclosure - OTHER ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureOtherAssetsTables</Role>
      <ShortName>OTHER ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureOtherAssets</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>30903 - Disclosure - ACCRUED LIABILITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureAccruedLiabilitiesTables</Role>
      <ShortName>ACCRUED LIABILITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureAccruedLiabilities</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>31103 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureIncomeTaxesTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureIncomeTaxes</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>31203 - Disclosure - SHARE-BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureShareBasedCompensationTables</Role>
      <ShortName>SHARE-BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureShareBasedCompensation</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>31303 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureCommitmentsAndContingenciesTables</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureCommitmentsAndContingencies</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>31503 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureEarningsPerShareTables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureEarningsPerShare</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>40101 - Disclosure - NATURE OF OPERATIONS - IPO and Corporate Conversion (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureNatureOfOperationsIpoAndCorporateConversionDetails</Role>
      <ShortName>NATURE OF OPERATIONS - IPO and Corporate Conversion (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>40102 - Disclosure - NATURE OF OPERATIONS - Segment Reporting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureNatureOfOperationsSegmentReportingDetails</Role>
      <ShortName>NATURE OF OPERATIONS - Segment Reporting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>40201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesCashAndCashEquivalentsDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>40202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable, Consumer Loans Receivable, Notes Receivable from Mobile Home Parks, Other Notes Receivable (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesAccountsReceivableConsumerLoansReceivableNotesReceivableFromMobileHomeParksOtherNotesReceivableDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable, Consumer Loans Receivable, Notes Receivable from Mobile Home Parks, Other Notes Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>40203 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory, Property, plant and equipment, Impairment of Long Lived Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesInventoryPropertyPlantAndEquipmentImpairmentOfLongLivedAssetsDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory, Property, plant and equipment, Impairment of Long Lived Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>40204 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Dealer Incentive Liability, Advertising Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDealerIncentiveLiabilityAdvertisingCostsDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Dealer Incentive Liability, Advertising Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>40205 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesProductWarrantyDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>40206 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measurement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesFairValueMeasurementDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measurement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>40207 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value of financial instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesFairValueOfFinancialInstrumentsDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value of financial instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>40208 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>40209 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDisaggregationOfRevenueDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>40210 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesIncomeTaxesDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>40211 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesConcentrationsDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>40301 - Disclosure - CONSUMER LOANS RECEIVABLE - Consumer loans receivable, net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureConsumerLoansReceivableConsumerLoansReceivableNetDetails</Role>
      <ShortName>CONSUMER LOANS RECEIVABLE - Consumer loans receivable, net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>40302 - Disclosure - CONSUMER LOANS RECEIVABLE - Allowance for loan losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureConsumerLoansReceivableAllowanceForLoanLossesDetails</Role>
      <ShortName>CONSUMER LOANS RECEIVABLE - Allowance for loan losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>40303 - Disclosure - CONSUMER LOANS RECEIVABLE - Impaired and general reserve for allowance for loan losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureConsumerLoansReceivableImpairedAndGeneralReserveForAllowanceForLoanLossesDetails</Role>
      <ShortName>CONSUMER LOANS RECEIVABLE - Impaired and general reserve for allowance for loan losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>40304 - Disclosure - CONSUMER LOANS RECEIVABLE - Aging of consumer loans receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureConsumerLoansReceivableAgingOfConsumerLoansReceivableDetails</Role>
      <ShortName>CONSUMER LOANS RECEIVABLE - Aging of consumer loans receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>40401 - Disclosure - NOTES RECEIVABLE FROM MOBILE HOME PARKS (MHP Notes) (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureNotesReceivableFromMobileHomeParksMhpNotesDetails</Role>
      <ShortName>NOTES RECEIVABLE FROM MOBILE HOME PARKS (MHP Notes) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureNotesReceivableFromMobileHomeParksMhpNotes</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>40501 - Disclosure - OTHER NOTES RECEIVABLE (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureOtherNotesReceivableDetails</Role>
      <ShortName>OTHER NOTES RECEIVABLE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureOtherNotesReceivableTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>40601 - Disclosure - INVENTORIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureInventoriesDetails</Role>
      <ShortName>INVENTORIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureInventoriesTables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>40701 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosurePropertyPlantAndEquipmentDetails</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosurePropertyPlantAndEquipmentTables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>40801 - Disclosure - OTHER ASSETS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureOtherAssetsDetails</Role>
      <ShortName>OTHER ASSETS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureOtherAssetsTables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>40901 - Disclosure - ACCRUED LIABILITIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureAccruedLiabilitiesDetails</Role>
      <ShortName>ACCRUED LIABILITIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureAccruedLiabilitiesTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>41001 - Disclosure - DEBT - Lines of Credit (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureDebtLinesOfCreditDetails</Role>
      <ShortName>DEBT - Lines of Credit (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>41002 - Disclosure - DEBT - PPP Loans and Notes Payable (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureDebtPppLoansAndNotesPayableDetails</Role>
      <ShortName>DEBT - PPP Loans and Notes Payable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>41101 - Disclosure - INCOME TAXES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureIncomeTaxesDetails</Role>
      <ShortName>INCOME TAXES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureIncomeTaxesTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>41201 - Disclosure - SHARE-BASED COMPENSATION - Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureShareBasedCompensationPlanDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>41202 - Disclosure - SHARE-BASED COMPENSATION - Restricted stock units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureShareBasedCompensationRestrictedStockUnitsDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - Restricted stock units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>41203 - Disclosure - SHARE-BASED COMPENSATION - Stock options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureShareBasedCompensationStockOptionsDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - Stock options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>41204 - Disclosure - SHARE-BASED COMPENSATION - Summary of Stock options activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureShareBasedCompensationSummaryOfStockOptionsActivityDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - Summary of Stock options activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>41301 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureCommitmentsAndContingenciesDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureCommitmentsAndContingenciesTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>41302 - Disclosure - COMMITMENTS AND CONTINGENCIES - Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureCommitmentsAndContingenciesLeasesDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>41401 - Disclosure - DERIVATIVES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureDerivativesDetails</Role>
      <ShortName>DERIVATIVES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureDerivatives</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>41501 - Disclosure - EARNINGS PER SHARE- Tabular (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureEarningsPerShareTabularDetails</Role>
      <ShortName>EARNINGS PER SHARE- Tabular (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>41502 - Disclosure - EARNINGS PER SHARE - Antidilutive Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureEarningsPerShareAntidilutiveSecuritiesDetails</Role>
      <ShortName>EARNINGS PER SHARE - Antidilutive Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="legh-20201231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>41601 - Disclosure - RELATED PARTY TRANSACTIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://legacyhousingcorp.com/role/DisclosureRelatedPartyTransactionsDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://legacyhousingcorp.com/role/DisclosureRelatedPartyTransactions</ParentRole>
      <Position>72</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>legh-20201231.xml</File>
    <File>legh-20201231.xsd</File>
    <File>legh-20201231_cal.xml</File>
    <File>legh-20201231_def.xml</File>
    <File>legh-20201231_lab.xml</File>
    <File>legh-20201231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/us-gaap/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2019-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
