<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>162</ContextCount>
  <ElementCount>375</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>54</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>995100 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/dei/role/document/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>995300 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/dei/role/document/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>995301 - Statement - Consolidated Statements of Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/ConsolidatedIncomeStatement</Role>
      <ShortName>Consolidated Statements of Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>995302 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/ConsolidatedBalanceSheet</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>995303 - Statement - Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/ConsolidatedBalanceSheet_Parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995304 - Statement - Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/ShareholdersEquityType2or3</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995305 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/ConsolidatedCashFlow</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995306 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/BasisofPresentationandSummaryofSignificantAccountingPolicies</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995307 - Disclosure - Net Sales</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/NetSales</Role>
      <ShortName>Net Sales</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995308 - Disclosure - Property and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/PropertyandEquipment</Role>
      <ShortName>Property and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995309 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995310 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995311 - Disclosure - Accrued Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/AccruedExpenses</Role>
      <ShortName>Accrued Expenses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995312 - Disclosure - Debt Obligations and Financing Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/DebtObligationsandFinancingArrangements</Role>
      <ShortName>Debt Obligations and Financing Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995313 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995314 - Disclosure - Equity Incentive Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/EquityIncentivePlans</Role>
      <ShortName>Equity Incentive Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995315 - Disclosure - Employee Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/EmployeeBenefitPlans</Role>
      <ShortName>Employee Benefit Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995316 - Disclosure - Common Stock</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/CommonStock</Role>
      <ShortName>Common Stock</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995317 - Disclosure - Segment Reporting and Entity-Wide Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/SegmentReportingandEntityWideInformation</Role>
      <ShortName>Segment Reporting and Entity-Wide Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995318 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995319 - Disclosure - Schedule I - Condensed Financial Information of Registrant</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/ScheduleICondensedFinancialInformationofRegistrant</Role>
      <ShortName>Schedule I - Condensed Financial Information of Registrant</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.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>22</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.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>23</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>996000 - Disclosure - Accounting Policies, by Policy (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/AccountingPoliciesByPolicy</Role>
      <ShortName>Accounting Policies, by Policy (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://ollies.us/role/BasisofPresentationandSummaryofSignificantAccountingPolicies</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>996001 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesTables</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ollies.us/role/BasisofPresentationandSummaryofSignificantAccountingPolicies</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>996002 - Disclosure - Net Sales (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/NetSalesTables</Role>
      <ShortName>Net Sales (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ollies.us/role/NetSales</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>996003 - Disclosure - Property and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/PropertyandEquipmentTables</Role>
      <ShortName>Property and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ollies.us/role/PropertyandEquipment</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>996004 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ollies.us/role/Leases</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>996005 - Disclosure - Accrued Expenses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/AccruedExpensesTables</Role>
      <ShortName>Accrued Expenses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ollies.us/role/AccruedExpenses</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>996006 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ollies.us/role/IncomeTaxes</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>996007 - Disclosure - Equity Incentive Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/EquityIncentivePlansTables</Role>
      <ShortName>Equity Incentive Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ollies.us/role/EquityIncentivePlans</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>996008 - Disclosure - Segment Reporting and Entity-Wide Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/SegmentReportingandEntityWideInformationTables</Role>
      <ShortName>Segment Reporting and Entity-Wide Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ollies.us/role/SegmentReportingandEntityWideInformation</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>996009 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesDetails</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ollies.us/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesTables</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>996010 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Investment Securities Classified as Held-to-Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/InvestmentSecuritiesClassifiedasHeldtoMaturityTable</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies - Investment Securities Classified as Held-to-Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>996011 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Useful Lives of Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/UsefulLivesofPropertyandEquipmentTable</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies - Useful Lives of Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>996012 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Earnings per Common Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/EarningsperCommonShareTable</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies - Earnings per Common Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>996013 - Disclosure - Net Sales (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/NetSalesDetails</Role>
      <ShortName>Net Sales (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ollies.us/role/NetSalesTables</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>996014 - Disclosure - Net Sales - Reconciliation of Liabilities for Ollie's Army Loyalty Program and Gift Cards and Sales Returns Allowance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/ReconciliationofLiabilitiesforOlliesArmyLoyaltyProgramandGiftCardsandSalesReturnsAllowanceTable</Role>
      <ShortName>Net Sales - Reconciliation of Liabilities for Ollie's Army Loyalty Program and Gift Cards and Sales Returns Allowance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>996015 - Disclosure - Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/PropertyandEquipmentDetails</Role>
      <ShortName>Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ollies.us/role/PropertyandEquipmentTables</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>996016 - Disclosure - Property and Equipment - Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/PropertyandEquipmentTable</Role>
      <ShortName>Property and Equipment - Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>996017 - Disclosure - Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/LeasesDetails</Role>
      <ShortName>Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ollies.us/role/LeasesTables</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>996018 - Disclosure - Leases - Maturity of Operating Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/MaturityofOperatingLeaseLiabilitiesTable</Role>
      <ShortName>Leases - Maturity of Operating Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>996019 - Disclosure - Leases - Other Information Related to Operating Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/OtherInformationRelatedtoOperatingLeasesTable</Role>
      <ShortName>Leases - Other Information Related to Operating Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>996020 - Disclosure - Accrued Expenses - Accrued Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/AccruedExpensesTable</Role>
      <ShortName>Accrued Expenses - Accrued Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>996021 - Disclosure - Debt Obligations and Financing Arrangements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/DebtObligationsandFinancingArrangementsDetails</Role>
      <ShortName>Debt Obligations and Financing Arrangements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ollies.us/role/DebtObligationsandFinancingArrangements</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>996022 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ollies.us/role/IncomeTaxesTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>996023 - Disclosure - Income Taxes - Income Tax Provision (Benefit) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/IncomeTaxProvisionBenefitTable</Role>
      <ShortName>Income Taxes - Income Tax Provision (Benefit) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>996024 - Disclosure - Income Taxes - Reconciliation of Statutory to Effective Income Tax Rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/ReconciliationofStatutorytoEffectiveIncomeTaxRateTable</Role>
      <ShortName>Income Taxes - Reconciliation of Statutory to Effective Income Tax Rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>996025 - Disclosure - Income Taxes - Income Taxes Paid (Net of Refunds Received) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/IncomeTaxesPaidNetofRefundsReceivedTable</Role>
      <ShortName>Income Taxes - Income Taxes Paid (Net of Refunds Received) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>996026 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/DeferredTaxAssetsandLiabilitiesTable</Role>
      <ShortName>Income Taxes - Deferred Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>996027 - Disclosure - Equity Incentive Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/EquityIncentivePlansDetails</Role>
      <ShortName>Equity Incentive Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ollies.us/role/EquityIncentivePlansTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>996028 - Disclosure - Equity Incentive Plans - Stock Option Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/StockOptionActivityTable</Role>
      <ShortName>Equity Incentive Plans - Stock Option Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>996029 - Disclosure - Equity Incentive Plans - Weighted Average Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/WeightedAverageAssumptionsTable</Role>
      <ShortName>Equity Incentive Plans - Weighted Average Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>996030 - Disclosure - Equity Incentive Plans - RSU Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/RSUActivityTable</Role>
      <ShortName>Equity Incentive Plans - RSU Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>996031 - Disclosure - Employee Benefit Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/EmployeeBenefitPlansDetails</Role>
      <ShortName>Employee Benefit Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ollies.us/role/EmployeeBenefitPlans</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>996032 - Disclosure - Common Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/CommonStockDetails</Role>
      <ShortName>Common Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ollies.us/role/CommonStock</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>996033 - Disclosure - Segment Reporting and Entity-Wide Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/SegmentReportingandEntityWideInformationDetails</Role>
      <ShortName>Segment Reporting and Entity-Wide Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ollies.us/role/SegmentReportingandEntityWideInformationTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996034 - Disclosure - Segment Reporting and Entity-Wide Information - Percentage of Net Sales by Product Group (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/PercentageofNetSalesbyProductGroupTable</Role>
      <ShortName>Segment Reporting and Entity-Wide Information - Percentage of Net Sales by Product Group (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996035 - Disclosure - Segment Reporting and Entity-Wide Information - Single Segment Net Sales, Net Income and Significant Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/SingleSegmentNetSalesNetIncomeandSignificantExpensesTable</Role>
      <ShortName>Segment Reporting and Entity-Wide Information - Single Segment Net Sales, Net Income and Significant Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996036 - Disclosure - Schedule I - Condensed Financial Information of Registrant (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/ScheduleICondensedFinancialInformationofRegistrantDetails</Role>
      <ShortName>Schedule I - Condensed Financial Information of Registrant (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ollies.us/role/ScheduleICondensedFinancialInformationofRegistrant</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996037 - Disclosure - Schedule I - Condensed Financial Information of Registrant - Condensed Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/CondensedBalanceSheetsTable</Role>
      <ShortName>Schedule I - Condensed Financial Information of Registrant - Condensed Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ef20060524_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996038 - Disclosure - Schedule I - Condensed Financial Information of Registrant - Condensed Statements of Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ollies.us/role/CondensedStatementsofIncomeTable</Role>
      <ShortName>Schedule I - Condensed Financial Information of Registrant - Condensed Statements of Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="ef20060524_10k.htm">ef20060524_10k.htm</File>
    <File>olli-20260131.xsd</File>
    <File>olli-20260131_cal.xml</File>
    <File>olli-20260131_def.xml</File>
    <File>olli-20260131_lab.xml</File>
    <File>olli-20260131_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>image01.jpg</File>
    <File>image02.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="889">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="16">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="38">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="12">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
