<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>414</ContextCount>
  <ElementCount>499</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>129</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>995300 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>995301 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>995302 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>995303 - Statement - Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ConsolidatedBalanceSheetsParentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>995304 - Statement - Consolidated Statements of Operations and Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ConsolidatedStatementsofOperationsandComprehensiveLoss</Role>
      <ShortName>Consolidated Statements of Operations and Comprehensive Loss</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995305 - Statement - Consolidated Statements of Operations and Comprehensive Loss (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ConsolidatedStatementsofOperationsandComprehensiveLossParentheticals</Role>
      <ShortName>Consolidated Statements of Operations and Comprehensive Loss (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995306 - Statement - Consolidated Statements of Changes in Equity (Deficit)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ConsolidatedStatementsofChangesinEquityDeficit</Role>
      <ShortName>Consolidated Statements of Changes in Equity (Deficit)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995307 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ConsolidatedStatementsofCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995308 - Disclosure - Organization and Principal Activities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/OrganizationandPrincipalActivities</Role>
      <ShortName>Organization and Principal Activities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995309 - Disclosure - Liquidity and Capital Resources</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/LiquidityandCapitalResources</Role>
      <ShortName>Liquidity and Capital Resources</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995310 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995311 - Disclosure - Discontinued Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/DiscontinuedOperations</Role>
      <ShortName>Discontinued Operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995312 - Disclosure - Accounts Receivable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/AccountsReceivable</Role>
      <ShortName>Accounts Receivable</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995313 - Disclosure - Prepayments, Other Receivables and Other Current Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/PrepaymentsOtherReceivablesandOtherCurrentAssets</Role>
      <ShortName>Prepayments, Other Receivables and Other Current Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995314 - Disclosure - Property and Equipment, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/PropertyandEquipmentNet</Role>
      <ShortName>Property and Equipment, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995315 - Disclosure - Intangible Assets, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IntangibleAssetsNet</Role>
      <ShortName>Intangible Assets, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995316 - Disclosure - Accrued Expenses and Other Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/AccruedExpensesandOtherLiabilities</Role>
      <ShortName>Accrued Expenses and Other Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995317 - Disclosure - Employee Benefit Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/EmployeeBenefitPlan</Role>
      <ShortName>Employee Benefit Plan</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995318 - Disclosure - Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/Equity</Role>
      <ShortName>Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995319 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995320 - Disclosure - Concentration</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/Concentration</Role>
      <ShortName>Concentration</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995321 - Disclosure - Related Party Transactions and Balances</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/RelatedPartyTransactionsandBalances</Role>
      <ShortName>Related Party Transactions and Balances</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995322 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995323 - Disclosure - Loss Per Shere – Basic and Diluted</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/LossPerShereBasicandDiluted</Role>
      <ShortName>Loss Per Shere – Basic and Diluted</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995324 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995325 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995326 - Disclosure - Parent-Only Financials</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ParentOnlyFinancials</Role>
      <ShortName>Parent-Only Financials</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995327 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995328 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/CybersecurityRiskManagementandStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>996329 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>996330 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>996331 - Disclosure - Discontinued Operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/DiscontinuedOperationsTables</Role>
      <ShortName>Discontinued Operations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/DiscontinuedOperations</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>996332 - Disclosure - Accounts Receivable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/AccountsReceivableTables</Role>
      <ShortName>Accounts Receivable (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/AccountsReceivable</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>996333 - Disclosure - Prepayments, Other Receivables and Other Current Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/PrepaymentsOtherReceivablesandOtherCurrentAssetsTables</Role>
      <ShortName>Prepayments, Other Receivables and Other Current Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/PrepaymentsOtherReceivablesandOtherCurrentAssets</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>996334 - Disclosure - Property and Equipment, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/PropertyandEquipmentNetTables</Role>
      <ShortName>Property and Equipment, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/PropertyandEquipmentNet</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>996335 - Disclosure - Intangible Assets, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IntangibleAssetsNetTables</Role>
      <ShortName>Intangible Assets, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/IntangibleAssetsNet</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>996336 - Disclosure - Accrued Expenses and Other Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/AccruedExpensesandOtherLiabilitiesTables</Role>
      <ShortName>Accrued Expenses and Other Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/AccruedExpensesandOtherLiabilities</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>996337 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/IncomeTaxes</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>996338 - Disclosure - Related Party Transactions and Balances (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/RelatedPartyTransactionsandBalancesTables</Role>
      <ShortName>Related Party Transactions and Balances (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/RelatedPartyTransactionsandBalances</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>996339 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/Leases</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>996340 - Disclosure - Loss Per Shere – Basic and Diluted (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/LossPerShereBasicandDilutedTables</Role>
      <ShortName>Loss Per Shere – Basic and Diluted (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/LossPerShereBasicandDiluted</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>996341 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/SegmentInformation</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>996342 - Disclosure - Parent-Only Financials (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ParentOnlyFinancialsTables</Role>
      <ShortName>Parent-Only Financials (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/ParentOnlyFinancials</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>996343 - Disclosure - Organization and Principal Activities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/OrganizationandPrincipalActivitiesDetails</Role>
      <ShortName>Organization and Principal Activities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/OrganizationandPrincipalActivities</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>996344 - Disclosure - Liquidity and Capital Resources (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/LiquidityandCapitalResourcesDetails</Role>
      <ShortName>Liquidity and Capital Resources (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/LiquidityandCapitalResources</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>996345 - Disclosure - Summary of Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesDetails</Role>
      <ShortName>Summary of Significant Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>996346 - Disclosure - Summary of Significant Accounting Policies - Schedule of Translation of Amounts from RMB into US (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesScheduleofTranslationofAmountsfromRMBintoUSDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Translation of Amounts from RMB into US (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>996347 - Disclosure - Summary of Significant Accounting Policies - Schedule of Fair Value on a Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesScheduleofFairValueonaRecurringBasisDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Fair Value on a Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>996348 - Disclosure - Summary of Significant Accounting Policies - Schedule of Assets and Liabilities Measured at Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesScheduleofAssetsandLiabilitiesMeasuredatFairValueDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Assets and Liabilities Measured at Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>996349 - Disclosure - Summary of Significant Accounting Policies - ​Schedule of Estimates the Fair Value to those Warrants Using the Black-Scholes Valuation Model (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesScheduleofEstimatestheFairValuetothoseWarrantsUsingtheBlackScholesValuationModelDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - ​Schedule of Estimates the Fair Value to those Warrants Using the Black-Scholes Valuation Model (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>996350 - Disclosure - Summary of Significant Accounting Policies - ​Schedule of Finance Lease Receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesScheduleofFinanceLeaseReceivablesDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - ​Schedule of Finance Lease Receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>996351 - Disclosure - Summary of Significant Accounting Policies - Schedule of Future Scheduled Minimum Lease Payments for Investments in Sales-Type Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesScheduleofFutureScheduledMinimumLeasePaymentsforInvestmentsinSalesTypeLeasesDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Future Scheduled Minimum Lease Payments for Investments in Sales-Type Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>996352 - Disclosure - Summary of Significant Accounting Policies - Schedule of Useful Life of Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesScheduleofUsefulLifeofPropertyandEquipmentDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Useful Life of Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>996353 - Disclosure - Summary of Significant Accounting Policies - Schedule of Disaggregated Information of Revenues (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SummaryofSignificantAccountingPoliciesScheduleofDisaggregatedInformationofRevenuesDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Disaggregated Information of Revenues (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>996354 - Disclosure - Discontinued Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/DiscontinuedOperationsDetails</Role>
      <ShortName>Discontinued Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/DiscontinuedOperationsTables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>996355 - Disclosure - Discontinued Operations - Schedule of Discontinued Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/DiscontinuedOperationsScheduleofDiscontinuedOperationsDetails</Role>
      <ShortName>Discontinued Operations - Schedule of Discontinued Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>996356 - Disclosure - Accounts Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/AccountsReceivableDetails</Role>
      <ShortName>Accounts Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/AccountsReceivableTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996357 - Disclosure - Accounts Receivable - Schedule of Accounts Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/AccountsReceivableScheduleofAccountsReceivableDetails</Role>
      <ShortName>Accounts Receivable - Schedule of Accounts Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996358 - Disclosure - Accounts Receivable - Schedule of Movement of Allowance for Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/AccountsReceivableScheduleofMovementofAllowanceforCreditLossesDetails</Role>
      <ShortName>Accounts Receivable - Schedule of Movement of Allowance for Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996359 - Disclosure - Prepayments, Other Receivables and Other Current Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/PrepaymentsOtherReceivablesandOtherCurrentAssetsDetails</Role>
      <ShortName>Prepayments, Other Receivables and Other Current Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/PrepaymentsOtherReceivablesandOtherCurrentAssetsTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996360 - Disclosure - Prepayments, Other Receivables and Other Current Assets - Schedule of Prepayments, Other Receivables and Other Current Assets, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/PrepaymentsOtherReceivablesandOtherCurrentAssetsScheduleofPrepaymentsOtherReceivablesandOtherCurrentAssetsNetDetails</Role>
      <ShortName>Prepayments, Other Receivables and Other Current Assets - Schedule of Prepayments, Other Receivables and Other Current Assets, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996361 - Disclosure - Prepayments, Other Receivables and Other Current Assets - Schedule of Movement of Allowance for Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/PrepaymentsOtherReceivablesandOtherCurrentAssetsScheduleofMovementofAllowanceforCreditLossesDetails</Role>
      <ShortName>Prepayments, Other Receivables and Other Current Assets - Schedule of Movement of Allowance for Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996362 - Disclosure - Property and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/PropertyandEquipmentNetDetails</Role>
      <ShortName>Property and Equipment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/PropertyandEquipmentNetTables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996363 - Disclosure - Property and Equipment, Net	 - Schedule of Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/PropertyandEquipmentNetScheduleofPropertyandEquipmentDetails</Role>
      <ShortName>Property and Equipment, Net	 - Schedule of Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996364 - Disclosure - Intangible Assets, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IntangibleAssetsNetDetails</Role>
      <ShortName>Intangible Assets, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/IntangibleAssetsNetTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996365 - Disclosure - Intangible Assets, Net - Schedule of Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IntangibleAssetsNetScheduleofIntangibleAssetsDetails</Role>
      <ShortName>Intangible Assets, Net - Schedule of Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996366 - Disclosure - Intangible Assets, Net - Schedule of Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IntangibleAssetsNetScheduleofAmortizationExpenseDetails</Role>
      <ShortName>Intangible Assets, Net - Schedule of Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996367 - Disclosure - Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/AccruedExpensesandOtherLiabilitiesScheduleofAccruedExpensesandOtherLiabilitiesDetails</Role>
      <ShortName>Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996368 - Disclosure - Employee Benefit Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/EmployeeBenefitPlanDetails</Role>
      <ShortName>Employee Benefit Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/EmployeeBenefitPlan</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996369 - Disclosure - Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/EquityDetails</Role>
      <ShortName>Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/Equity</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996370 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/IncomeTaxesTables</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996371 - Disclosure - Income Taxes - Schedule of Income/(Loss) Before Income Tax by Jurisdiction (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IncomeTaxesScheduleofIncomeLossBeforeIncomeTaxbyJurisdictionDetails</Role>
      <ShortName>Income Taxes - Schedule of Income/(Loss) Before Income Tax by Jurisdiction (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996372 - Disclosure - Income Taxes - Schedule of Reconciliation of Taxes at the PRC Statutory Rat (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IncomeTaxesScheduleofReconciliationofTaxesatthePRCStatutoryRatDetails</Role>
      <ShortName>Income Taxes - Schedule of Reconciliation of Taxes at the PRC Statutory Rat (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>996373 - Disclosure - Income Taxes - Schedule of Cash Paid for Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IncomeTaxesScheduleofCashPaidforIncomeTaxesDetails</Role>
      <ShortName>Income Taxes - Schedule of Cash Paid for Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>996374 - Disclosure - Income Taxes - Schedule of Deferred Taxes for Continuing Operation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IncomeTaxesScheduleofDeferredTaxesforContinuingOperationDetails</Role>
      <ShortName>Income Taxes - Schedule of Deferred Taxes for Continuing Operation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>996375 - Disclosure - Income Taxes - Schedule of Changes Related to Valuation Allowance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/IncomeTaxesScheduleofChangesRelatedtoValuationAllowanceDetails</Role>
      <ShortName>Income Taxes - Schedule of Changes Related to Valuation Allowance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>996376 - Disclosure - Concentration (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ConcentrationDetails</Role>
      <ShortName>Concentration (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/Concentration</ParentRole>
      <Position>79</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>996377 - Disclosure - Related Party Transactions and Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/RelatedPartyTransactionsandBalancesDetails</Role>
      <ShortName>Related Party Transactions and Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/RelatedPartyTransactionsandBalancesTables</ParentRole>
      <Position>80</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>996378 - Disclosure - Related Party Transactions and Balances - Schedule of Due from Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/RelatedPartyTransactionsandBalancesScheduleofDuefromRelatedPartiesDetails</Role>
      <ShortName>Related Party Transactions and Balances - Schedule of Due from Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>996379 - Disclosure - Related Party Transactions and Balances - Schedule of Allowance for Credit Losses Due from Jinkailong (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/RelatedPartyTransactionsandBalancesScheduleofAllowanceforCreditLossesDuefromJinkailongDetails</Role>
      <ShortName>Related Party Transactions and Balances - Schedule of Allowance for Credit Losses Due from Jinkailong (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>996380 - Disclosure - Related Party Transactions and Balances - Schedule of Due to Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/RelatedPartyTransactionsandBalancesScheduleofDuetoRelatedPartiesDetails</Role>
      <ShortName>Related Party Transactions and Balances - Schedule of Due to Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>996381 - Disclosure - Related Party Transactions and Balances - Schedule of Operating Lease Right-of-Use Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/RelatedPartyTransactionsandBalancesScheduleofOperatingLeaseRightofUseAssetsDetails</Role>
      <ShortName>Related Party Transactions and Balances - Schedule of Operating Lease Right-of-Use Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>996382 - Disclosure - Related Party Transactions and Balances - Schedule of Related Party Transaction (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/RelatedPartyTransactionsandBalancesScheduleofRelatedPartyTransactionDetails</Role>
      <ShortName>Related Party Transactions and Balances - Schedule of Related Party Transaction (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>996383 - Disclosure - Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/LeasesDetails</Role>
      <ShortName>Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/LeasesTables</ParentRole>
      <Position>86</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>996384 - Disclosure - Leases - Schedule of Company’s Minimum Lease Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/LeasesScheduleofCompanysMinimumLeasePaymentsDetails</Role>
      <ShortName>Leases - Schedule of Company’s Minimum Lease Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>996385 - Disclosure - Loss Per Shere – Basic and Diluted - Schedule of Earning Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/LossPerShereBasicandDilutedScheduleofEarningPerShareDetails</Role>
      <ShortName>Loss Per Shere – Basic and Diluted - Schedule of Earning Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>996386 - Disclosure - Loss Per Shere – Basic and Diluted - Schedule of Anti-Dilutive Ordinary Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/LossPerShereBasicandDilutedScheduleofAntiDilutiveOrdinarySharesDetails</Role>
      <ShortName>Loss Per Shere – Basic and Diluted - Schedule of Anti-Dilutive Ordinary Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>996387 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/CommitmentsandContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/CommitmentsandContingencies</ParentRole>
      <Position>90</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>996388 - Disclosure - Segment Information - Schedule of Segment's Revenue, Loss from Operations, Loss Before Income Taxes and Net Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SegmentInformationScheduleofSegmentsRevenueLossfromOperationsLossBeforeIncomeTaxesandNetLossDetails</Role>
      <ShortName>Segment Information - Schedule of Segment's Revenue, Loss from Operations, Loss Before Income Taxes and Net Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>996389 - Disclosure - Parent-Only Financials (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ParentOnlyFinancialsDetails</Role>
      <ShortName>Parent-Only Financials (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/ParentOnlyFinancialsTables</ParentRole>
      <Position>92</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>996390 - Disclosure - Parent-Only Financials - Schedule of Condensed Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ParentOnlyFinancialsScheduleofCondensedBalanceSheetsDetails</Role>
      <ShortName>Parent-Only Financials - Schedule of Condensed Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>996391 - Disclosure - Parent-Only Financials - Schedule of Condensed Balance Sheets (Details) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ParentOnlyFinancialsScheduleofCondensedBalanceSheetsDetailsParentheticals</Role>
      <ShortName>Parent-Only Financials - Schedule of Condensed Balance Sheets (Details) (Parentheticals)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>996392 - Disclosure - Parent-Only Financials - Schedule of Condensed Statements of Operations and Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ParentOnlyFinancialsScheduleofCondensedStatementsofOperationsandComprehensiveLossDetails</Role>
      <ShortName>Parent-Only Financials - Schedule of Condensed Statements of Operations and Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>996393 - Disclosure - Parent-Only Financials - Schedule of Condensed Statements of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/ParentOnlyFinancialsScheduleofCondensedStatementsofCashFlowsDetails</Role>
      <ShortName>Parent-Only Financials - Schedule of Condensed Statements of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="ea0295105-10k_senmiao.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>996394 - Disclosure - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ihongsen.com/20260331/role/SubsequentEventsDetails</Role>
      <ShortName>Subsequent Events (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ihongsen.com/20260331/role/SubsequentEvents</ParentRole>
      <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>aihs-20260331.xsd</File>
    <File>aihs-20260331_cal.xml</File>
    <File>aihs-20260331_def.xml</File>
    <File>aihs-20260331_lab.xml</File>
    <File>aihs-20260331_pre.xml</File>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="ea0295105-10k_senmiao.htm">ea0295105-10k_senmiao.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>ea029510501_img1.jpg</File>
    <File>ea029510501_img2.jpg</File>
    <File>ea029510501_img3.jpg</File>
    <File>ea029510501_img4.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="3">http://fasb.org/srt/2026</BaseTaxonomy>
    <BaseTaxonomy items="1210">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="6">http://xbrl.sec.gov/cyd/2026</BaseTaxonomy>
    <BaseTaxonomy items="42">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
