<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>148</ContextCount>
  <ElementCount>232</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>37</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>00100 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/StatementCondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>00105 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/StatementCondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>00200 - Statement - Condensed Consolidated Statements of Income and Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/StatementCondensedConsolidatedStatementsOfIncomeAndComprehensiveIncome</Role>
      <ShortName>Condensed Consolidated Statements of Income and Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>00300 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/StatementCondensedConsolidatedStatementsOfChangesInStockholdersEquity</Role>
      <ShortName>Condensed Consolidated Statements of Changes in Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>00400 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/StatementCondensedConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>10101 - Disclosure - Basis of Preparation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureBasisOfPreparation</Role>
      <ShortName>Basis of Preparation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>10201 - Disclosure - New Accounting Pronouncements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureNewAccountingPronouncements</Role>
      <ShortName>New Accounting Pronouncements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>10301 - Disclosure - Short Term Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureShortTermInvestments</Role>
      <ShortName>Short Term Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>10401 - Disclosure - Allowance for Doubtful Accounts</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureAllowanceForDoubtfulAccounts</Role>
      <ShortName>Allowance for Doubtful Accounts</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>10501 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>10601 - Disclosure - Accrued Expenses and Current Portion of Other Long-Term Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureAccruedExpensesAndCurrentPortionOfOtherLongTermLiabilities</Role>
      <ShortName>Accrued Expenses and Current Portion of Other Long-Term Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>10701 - Disclosure - Long-Term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureLongTermDebt</Role>
      <ShortName>Long-Term Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>10801 - Disclosure - Dividends</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureDividends</Role>
      <ShortName>Dividends</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>10901 - Disclosure - Earnings Per Common Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureEarningsPerCommonShare</Role>
      <ShortName>Earnings Per Common Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>11001 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureLeases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>11101 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureSegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>11201 - Disclosure - Fair Values of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureFairValuesOfFinancialInstruments</Role>
      <ShortName>Fair Values of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>11301 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>11501 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureRelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>30603 - Disclosure - Accrued Expenses and Current Portion of Other Long-Term Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureAccruedExpensesAndCurrentPortionOfOtherLongTermLiabilitiesTables</Role>
      <ShortName>Accrued Expenses and Current Portion of Other Long-Term Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureAccruedExpensesAndCurrentPortionOfOtherLongTermLiabilities</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>30703 - Disclosure - Long-Term Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureLongTermDebtTables</Role>
      <ShortName>Long-Term Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureLongTermDebt</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>30903 - Disclosure - Earnings Per Common Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureEarningsPerCommonShareTables</Role>
      <ShortName>Earnings Per Common Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureEarningsPerCommonShare</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>31003 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureLeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureLeases</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>31103 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureSegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureSegmentInformation</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>31203 - Disclosure - Fair Values of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureFairValuesOfFinancialInstrumentsTables</Role>
      <ShortName>Fair Values of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureFairValuesOfFinancialInstruments</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>40401 - Disclosure - Allowance for Doubtful Accounts (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureAllowanceForDoubtfulAccountsNarrativeDetails</Role>
      <ShortName>Allowance for Doubtful Accounts (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureAllowanceForDoubtfulAccounts</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>40601 - Disclosure - Accrued Expenses and Current Portion of Other Long-Term Liabilities (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureAccruedExpensesAndCurrentPortionOfOtherLongTermLiabilitiesNarrativeDetails</Role>
      <ShortName>Accrued Expenses and Current Portion of Other Long-Term Liabilities (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureAccruedExpensesAndCurrentPortionOfOtherLongTermLiabilitiesTables</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>40602 - Disclosure - Accrued Expenses and Current Portion of Other Long-Term Liabilities (Accrued Expenses and Current Portion of Other Long-Term Liabilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureAccruedExpensesAndCurrentPortionOfOtherLongTermLiabilitiesAccruedExpensesAndCurrentPortionOfOtherLongTermLiabilitiesDetails</Role>
      <ShortName>Accrued Expenses and Current Portion of Other Long-Term Liabilities (Accrued Expenses and Current Portion of Other Long-Term Liabilities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureAccruedExpensesAndCurrentPortionOfOtherLongTermLiabilitiesTables</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>40701 - Disclosure - Long-Term Debt (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureLongTermDebtNarrativeDetails</Role>
      <ShortName>Long-Term Debt (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureLongTermDebtTables</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>40703 - Disclosure - Long-Term Debt (Schedule of Redemption Prices of Senior Notes) (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureLongTermDebtScheduleOfRedemptionPricesOfSeniorNotesDetails</Role>
      <ShortName>Long-Term Debt (Schedule of Redemption Prices of Senior Notes) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureLongTermDebtTables</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>40801 - Disclosure - Dividends (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureDividendsNarrativeDetails</Role>
      <ShortName>Dividends (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureDividends</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>40901 - Disclosure - Earnings Per Common Share (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureEarningsPerCommonShareNarrativeDetails</Role>
      <ShortName>Earnings Per Common Share (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureEarningsPerCommonShareTables</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>40902 - Disclosure - Earnings Per Common Share (Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureEarningsPerCommonShareReconciliationOfNumeratorsAndDenominatorsOfBasicAndDilutedEarningsPerShareDetails</Role>
      <ShortName>Earnings Per Common Share (Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureEarningsPerCommonShareTables</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>41001 - Disclosure - Leases (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureLeasesNarrativeDetails</Role>
      <ShortName>Leases (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureLeasesTables</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>41002 - Disclosure - Leases (Future Maturities of Lease Liabilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureLeasesFutureMaturitiesOfLeaseLiabilitiesDetails</Role>
      <ShortName>Leases (Future Maturities of Lease Liabilities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureLeasesTables</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>41003 - Disclosure - Leases (Schedule of Rental Income) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureLeasesScheduleOfRentalIncomeDetails</Role>
      <ShortName>Leases (Schedule of Rental Income) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureLeasesTables</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>41004 - Disclosure - Leases (Future Minimum Operating Lease Receipts) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureLeasesFutureMinimumOperatingLeaseReceiptsDetails</Role>
      <ShortName>Leases (Future Minimum Operating Lease Receipts) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureLeasesTables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>41101 - Disclosure - Segment Information (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureSegmentInformationNarrativeDetails</Role>
      <ShortName>Segment Information (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureSegmentInformationTables</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>41102 - Disclosure - Segment Information (Operations by Lines of Business) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureSegmentInformationOperationsByLinesOfBusinessDetails</Role>
      <ShortName>Segment Information (Operations by Lines of Business) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureSegmentInformationTables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>41201 - Disclosure - Fair Values of Financial Instruments (Carrying Amount and Fair Value of Debt, Interest Rate Swap and Non-Qualified Plan Assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureFairValuesOfFinancialInstrumentsCarryingAmountAndFairValueOfDebtInterestRateSwapAndNonQualifiedPlanAssetsDetails</Role>
      <ShortName>Fair Values of Financial Instruments (Carrying Amount and Fair Value of Debt, Interest Rate Swap and Non-Qualified Plan Assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureFairValuesOfFinancialInstrumentsTables</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>41301 - Disclosure - Commitments and Contingencies (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureCommitmentsAndContingenciesNarrativeDetails</Role>
      <ShortName>Commitments and Contingencies (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureCommitmentsAndContingencies</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>41501 - Disclosure - Related Party Transactions (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ingles-markets.com/role/DisclosureRelatedPartyTransactionsNarrativeDetails</Role>
      <ShortName>Related Party Transactions (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ingles-markets.com/role/DisclosureRelatedPartyTransactions</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="imkt-20260328x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.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>Uncategorized</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>imkt-20260328.xsd</File>
    <File>imkt-20260328_cal.xml</File>
    <File>imkt-20260328_def.xml</File>
    <File>imkt-20260328_lab.xml</File>
    <File>imkt-20260328_pre.xml</File>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="imkt-20260328x10q.htm">imkt-20260328x10q.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="559">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="30">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
