<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.20.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>201</ContextCount>
  <ElementCount>494</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>69</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>11</UnitCount>
  <MyReports>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>00100 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/StatementConsolidatedBalanceSheets</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>00105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>00200 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/StatementConsolidatedStatementsOfComprehensiveLossIncome</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>00300 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/StatementConsolidatedStatementsOfChangesInShareholdersEquity</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>00305 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/StatementConsolidatedStatementsOfChangesInShareholdersEquityParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>00400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>10101 - Disclosure - BUSINESS DESCRIPTION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureBusinessDescription</Role>
      <ShortName>BUSINESS DESCRIPTION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>10201 - Disclosure - GOING CONCERN</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureGoingConcern</Role>
      <ShortName>GOING CONCERN</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>10301 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>10401 - Disclosure - ACCOUNTS RECEIVABLE AND CONTRACT ASSETS, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureAccountsReceivableAndContractAssetsNet</Role>
      <ShortName>ACCOUNTS RECEIVABLE AND CONTRACT ASSETS, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>10501 - Disclosure - LOANS RECEIVABLE, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureLoansReceivableNet</Role>
      <ShortName>LOANS RECEIVABLE, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>10601 - Disclosure - PREPAYMENTS AND OTHER ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosurePrepaymentsAndOtherAssets</Role>
      <ShortName>PREPAYMENTS AND OTHER ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>10701 - Disclosure - OTHER RECEIVABLE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureOtherReceivable</Role>
      <ShortName>OTHER RECEIVABLE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>10801 - Disclosure - PROPERTY, EQUIPMENT AND SOFTWARE, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosurePropertyEquipmentAndSoftwareNet</Role>
      <ShortName>PROPERTY, EQUIPMENT AND SOFTWARE, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>10901 - Disclosure - LONG-TERM INVESTMENTS, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureLongTermInvestmentsNet</Role>
      <ShortName>LONG-TERM INVESTMENTS, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>11001 - Disclosure - RIGHT-OF-USE LEASE ASSETS AND LEASE LIABILITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureRightOfUseLeaseAssetsAndLeaseLiability</Role>
      <ShortName>RIGHT-OF-USE LEASE ASSETS AND LEASE LIABILITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>11101 - Disclosure - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureAccruedExpensesAndOtherCurrentLiabilities</Role>
      <ShortName>ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>11201 - Disclosure - NOTE PAYABLE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureNotePayable</Role>
      <ShortName>NOTE PAYABLE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>11301 - Disclosure - RELATED PARTY BALANCES AND TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureRelatedPartyBalancesAndTransactions</Role>
      <ShortName>RELATED PARTY BALANCES AND TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>11401 - Disclosure - EMPLOYEE BENEFITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureEmployeeBenefits</Role>
      <ShortName>EMPLOYEE BENEFITS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>11501 - Disclosure - TAXES PAYABLE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureTaxesPayable</Role>
      <ShortName>TAXES PAYABLE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>11601 - Disclosure - INCOME TAX</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureIncomeTax</Role>
      <ShortName>INCOME TAX</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>11701 - Disclosure - EARNINGS (LOSS) PER SHARE ("EPS")</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureEarningsLossPerShareeps</Role>
      <ShortName>EARNINGS (LOSS) PER SHARE ("EPS")</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>11801 - Disclosure - SHAREHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureShareholdersEquity</Role>
      <ShortName>SHAREHOLDERS' EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>11901 - Disclosure - SHARE-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureShareBasedCompensation</Role>
      <ShortName>SHARE-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>12001 - Disclosure - TREASURY STOCK</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureTreasuryStock</Role>
      <ShortName>TREASURY STOCK</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>12101 - Disclosure - DIVIDEND</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureDividend</Role>
      <ShortName>DIVIDEND</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>12201 - Disclosure - RESTRICTED NET ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureRestrictedNetAssets</Role>
      <ShortName>RESTRICTED NET ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>12301 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureCommitmentsAndContingencies</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>12401 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSubsequentEvents</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>12501 - Disclosure - CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureCondensedFinancialInformationOfParentCompany</Role>
      <ShortName>CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>20302 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>30103 - Disclosure - BUSINESS DESCRIPTION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureBusinessDescriptionTables</Role>
      <ShortName>BUSINESS DESCRIPTION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureBusinessDescription</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>30303 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>30304 - Disclosure - ACCOUNTS RECEIVABLE AND CONTRACT ASSETS, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureAccountsReceivableAndContractAssetsNetTables</Role>
      <ShortName>ACCOUNTS RECEIVABLE AND CONTRACT ASSETS, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureAccountsReceivableAndContractAssetsNet</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>30503 - Disclosure - LOANS RECEIVABLE, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureLoansReceivableNetTables</Role>
      <ShortName>LOANS RECEIVABLE, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureLoansReceivableNet</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>30603 - Disclosure - PREPAYMENTS AND OTHER ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosurePrepaymentsAndOtherAssetsTables</Role>
      <ShortName>PREPAYMENTS AND OTHER ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosurePrepaymentsAndOtherAssets</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>30703 - Disclosure - OTHER RECEIVABLE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureOtherReceivableTables</Role>
      <ShortName>OTHER RECEIVABLE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureOtherReceivable</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>30803 - Disclosure - PROPERTY, EQUIPMENT AND SOFTWARE, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosurePropertyEquipmentAndSoftwareNetTables</Role>
      <ShortName>PROPERTY, EQUIPMENT AND SOFTWARE, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosurePropertyEquipmentAndSoftwareNet</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>30903 - Disclosure - LONG-TERM INVESTMENTS, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureLongTermInvestmentsNetTables</Role>
      <ShortName>LONG-TERM INVESTMENTS, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureLongTermInvestmentsNet</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>31003 - Disclosure - RIGHT-OF-USE LEASE ASSETS AND LEASE LIABILITY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureRightOfUseLeaseAssetsAndLeaseLiabilityTables</Role>
      <ShortName>RIGHT-OF-USE LEASE ASSETS AND LEASE LIABILITY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureRightOfUseLeaseAssetsAndLeaseLiability</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>31103 - Disclosure - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesTables</Role>
      <ShortName>ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureAccruedExpensesAndOtherCurrentLiabilities</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>31503 - Disclosure - TAXES PAYABLE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureTaxesPayableTables</Role>
      <ShortName>TAXES PAYABLE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureTaxesPayable</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>31603 - Disclosure - INCOME TAX (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureIncomeTaxTables</Role>
      <ShortName>INCOME TAX (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureIncomeTax</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>31703 - Disclosure - EARNINGS (LOSS) PER SHARE ("EPS") (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureEarningsLossPerShareepsTables</Role>
      <ShortName>EARNINGS (LOSS) PER SHARE ("EPS") (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureEarningsLossPerShareeps</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>31903 - Disclosure - SHARE-BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureShareBasedCompensationTables</Role>
      <ShortName>SHARE-BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureShareBasedCompensation</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>40101 - Disclosure - BUSINESS DESCRIPTION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureBusinessDescriptionDetails</Role>
      <ShortName>BUSINESS DESCRIPTION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureBusinessDescriptionTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>40102 - Disclosure - BUSINESS DESCRIPTION - Initial Public Offering (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureBusinessDescriptionInitialPublicOfferingDetails</Role>
      <ShortName>BUSINESS DESCRIPTION - Initial Public Offering (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>40201 - Disclosure - GOING CONCERN (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureGoingConcernDetails</Role>
      <ShortName>GOING CONCERN (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureGoingConcern</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>40301 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>40302 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Consolidated VIE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesConsolidatedVieDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Consolidated VIE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>40303 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Consolidated Trust (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesConsolidatedTrustDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Consolidated Trust (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>40304 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>40305 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDisaggregationOfRevenueDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>40306 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of adoption of ASU 606 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesImpactOfAdoptionOfAsu606Details</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of adoption of ASU 606 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>40307 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Contract Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesContractAssetsDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Contract Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>40308 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Material Terms and Conditions of the Insurance Agreement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesMaterialTermsAndConditionsOfInsuranceAgreementDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Material Terms and Conditions of the Insurance Agreement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>40309 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Guarantees Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesGuaranteesLiabilitiesDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Guarantees Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>40310 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable, contract assets and allowance for uncollectible accounts and Loans receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesAccountsReceivableContractAssetsAndAllowanceForUncollectibleAccountsAndLoansReceivableDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable, contract assets and allowance for uncollectible accounts and Loans receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>40311 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, equipment and software, net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPropertyEquipmentAndSoftwareNetDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, equipment and software, net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>40312 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of long lived assets, Advertising and promotion expenses and Research and development costs and Lease (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesImpairmentOfLongLivedAssetsAdvertisingAndPromotionExpensesAndResearchAndDevelopmentCostsAndLeaseDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of long lived assets, Advertising and promotion expenses and Research and development costs and Lease (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>40313 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income taxes and segment reporting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesIncomeTaxesAndSegmentReportingDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income taxes and segment reporting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>40314 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Significant Risks and Uncertainties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureSummaryOfSignificantAccountingPoliciesSignificantRisksAndUncertaintiesDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Significant Risks and Uncertainties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>40401 - Disclosure - ACCOUNTS RECEIVABLE AND CONTRACT ASSETS, NET (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureAccountsReceivableAndContractAssetsNetDetails</Role>
      <ShortName>ACCOUNTS RECEIVABLE AND CONTRACT ASSETS, NET (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureAccountsReceivableAndContractAssetsNetTables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>40501 - Disclosure - LOANS RECEIVABLE, NET (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureLoansReceivableNetDetails</Role>
      <ShortName>LOANS RECEIVABLE, NET (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureLoansReceivableNetTables</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>40502 - Disclosure - LOANS RECEIVABLE, NET - Movement of allowance for uncollectible loans receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureLoansReceivableNetMovementOfAllowanceForUncollectibleLoansReceivableDetails</Role>
      <ShortName>LOANS RECEIVABLE, NET - Movement of allowance for uncollectible loans receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>40601 - Disclosure - PREPAYMENTS AND OTHER ASSETS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosurePrepaymentsAndOtherAssetsDetails</Role>
      <ShortName>PREPAYMENTS AND OTHER ASSETS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosurePrepaymentsAndOtherAssetsTables</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>40701 - Disclosure - OTHER RECEIVABLE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureOtherReceivableDetails</Role>
      <ShortName>OTHER RECEIVABLE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureOtherReceivableTables</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>40801 - Disclosure - PROPERTY, EQUIPMENT AND SOFTWARE, NET (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosurePropertyEquipmentAndSoftwareNetDetails</Role>
      <ShortName>PROPERTY, EQUIPMENT AND SOFTWARE, NET (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosurePropertyEquipmentAndSoftwareNetTables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>40901 - Disclosure - LONG-TERM INVESTMENTS, NET (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureLongTermInvestmentsNetDetails</Role>
      <ShortName>LONG-TERM INVESTMENTS, NET (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureLongTermInvestmentsNetTables</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>41001 - Disclosure - RIGHT-OF-USE LEASE ASSETS AND LEASE LIABILITY - Supplemental balance sheet information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureRightOfUseLeaseAssetsAndLeaseLiabilitySupplementalBalanceSheetInformationDetails</Role>
      <ShortName>RIGHT-OF-USE LEASE ASSETS AND LEASE LIABILITY - Supplemental balance sheet information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>41002 - Disclosure - RIGHT-OF-USE LEASE ASSETS AND LEASE LIABILITY - Weighted average remaining lease terms and discount rates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureRightOfUseLeaseAssetsAndLeaseLiabilityWeightedAverageRemainingLeaseTermsAndDiscountRatesDetails</Role>
      <ShortName>RIGHT-OF-USE LEASE ASSETS AND LEASE LIABILITY - Weighted average remaining lease terms and discount rates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>41003 - Disclosure - RIGHT-OF-USE LEASE ASSETS AND LEASE LIABILITY - Schedule of maturities of lease liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureRightOfUseLeaseAssetsAndLeaseLiabilityScheduleOfMaturitiesOfLeaseLiabilitiesDetails</Role>
      <ShortName>RIGHT-OF-USE LEASE ASSETS AND LEASE LIABILITY - Schedule of maturities of lease liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>41101 - Disclosure - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesDetails</Role>
      <ShortName>ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesTables</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>41201 - Disclosure - NOTE PAYABLE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureNotePayableDetails</Role>
      <ShortName>NOTE PAYABLE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureNotePayable</ParentRole>
      <Position>76</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>41301 - Disclosure - RELATED PARTY BALANCES AND TRANSACTIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureRelatedPartyBalancesAndTransactionsDetails</Role>
      <ShortName>RELATED PARTY BALANCES AND TRANSACTIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureRelatedPartyBalancesAndTransactions</ParentRole>
      <Position>77</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>41401 - Disclosure - EMPLOYEE BENEFITS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureEmployeeBenefitsDetails</Role>
      <ShortName>EMPLOYEE BENEFITS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureEmployeeBenefits</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>41501 - Disclosure - TAXES PAYABLE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureTaxesPayableDetails</Role>
      <ShortName>TAXES PAYABLE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureTaxesPayableTables</ParentRole>
      <Position>79</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>41601 - Disclosure - INCOME TAX (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureIncomeTaxDetails</Role>
      <ShortName>INCOME TAX (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureIncomeTaxTables</ParentRole>
      <Position>80</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>41602 - Disclosure - INCOME TAX - Components of the income tax provision (benefit) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureIncomeTaxComponentsOfIncomeTaxProvisionBenefitDetails</Role>
      <ShortName>INCOME TAX - Components of the income tax provision (benefit) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>41603 - Disclosure - INCOME TAX - Net deferred tax assets resulting from differences between financial accounting basis and tax basis of assets and liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureIncomeTaxNetDeferredTaxAssetsResultingFromDifferencesBetweenFinancialAccountingBasisAndTaxBasisOfAssetsAndLiabilitiesDetails</Role>
      <ShortName>INCOME TAX - Net deferred tax assets resulting from differences between financial accounting basis and tax basis of assets and liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>41604 - Disclosure - INCOME TAX - Reconciles the PRC statutory rates to the Company's effective tax rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureIncomeTaxReconcilesPrcStatutoryRatesToCompanySEffectiveTaxRateDetails</Role>
      <ShortName>INCOME TAX - Reconciles the PRC statutory rates to the Company's effective tax rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>41605 - Disclosure - INCOME TAX - Others (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureIncomeTaxOthersDetails</Role>
      <ShortName>INCOME TAX - Others (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>41606 - Disclosure - INCOME TAX - Tax Holiday and Preferential Tax Rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureIncomeTaxTaxHolidayAndPreferentialTaxRateDetails</Role>
      <ShortName>INCOME TAX - Tax Holiday and Preferential Tax Rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>41701 - Disclosure - EARNINGS PER SHARE ("EPS") (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureEarningsPerShareepsDetails</Role>
      <ShortName>EARNINGS PER SHARE ("EPS") (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>41801 - Disclosure - SHAREHOLDERS' EQUITY (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureShareholdersEquityDetails</Role>
      <ShortName>SHAREHOLDERS' EQUITY (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureShareholdersEquity</ParentRole>
      <Position>87</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>41901 - Disclosure - SHARE-BASED COMPENSATION - 2016 Equity Incentive Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureShareBasedCompensation2016EquityIncentivePlanDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - 2016 Equity Incentive Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>41902 - Disclosure - SHARE-BASED COMPENSATION - Restricted Stock Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureShareBasedCompensationRestrictedStockUnitsDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - Restricted Stock Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>42001 - Disclosure - TREASURY STOCK (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureTreasuryStockDetails</Role>
      <ShortName>TREASURY STOCK (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureTreasuryStock</ParentRole>
      <Position>90</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>42101 - Disclosure - DIVIDEND (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureDividendDetails</Role>
      <ShortName>DIVIDEND (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureDividend</ParentRole>
      <Position>91</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>42201 - Disclosure - RESTRICTED NET ASSETS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureRestrictedNetAssetsDetails</Role>
      <ShortName>RESTRICTED NET ASSETS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureRestrictedNetAssets</ParentRole>
      <Position>92</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>42301 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureCommitmentsAndContingenciesDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureCommitmentsAndContingencies</ParentRole>
      <Position>93</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>42501 - Disclosure - CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureCondensedFinancialInformationOfParentCompanyDetails</Role>
      <ShortName>CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hexindai.com/role/DisclosureCondensedFinancialInformationOfParentCompany</ParentRole>
      <Position>94</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>42502 - Disclosure - CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY - CONDENSED BALANCE SHEETS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureCondensedFinancialInformationOfParentCompanyCondensedBalanceSheetsDetails</Role>
      <ShortName>CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY - CONDENSED BALANCE SHEETS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>42503 - Disclosure - CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY - CONDENSED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureCondensedFinancialInformationOfParentCompanyCondensedStatementsOfComprehensiveLossIncomeDetails</Role>
      <ShortName>CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY - CONDENSED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="hx-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>42504 - Disclosure - CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY - CONDENSED STATEMENTS OF CASH FLOWS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hexindai.com/role/DisclosureCondensedFinancialInformationOfParentCompanyCondensedStatementsOfCashFlowsDetails</Role>
      <ShortName>CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY - CONDENSED STATEMENTS OF CASH FLOWS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>hx-20200331.xml</File>
    <File>hx-20200331.xsd</File>
    <File>hx-20200331_cal.xml</File>
    <File>hx-20200331_def.xml</File>
    <File>hx-20200331_lab.xml</File>
    <File>hx-20200331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/country/2017-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/currency/2019-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
