<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Version>2.4.0.8</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>76</ContextCount>
  <ElementCount>202</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>20</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Disclosure - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Consolidated Statements of Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/ConsolidatedIncomeStatement</Role>
      <ShortName>Consolidated Statements of Income (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/ConsolidatedComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/ConsolidatedComprehensiveIncome_Parentheticals</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals)</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/ConsolidatedBalanceSheet</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Consolidated Balance Sheets (Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/ConsolidatedBalanceSheet_Parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited) (Parentheticals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/ConsolidatedCashFlow</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Note 1 - Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note1BasisofPresentation</Role>
      <ShortName>Note 1 - Basis of Presentation</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Note 2 - Recent Accounting Pronouncements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note2RecentAccountingPronouncements</Role>
      <ShortName>Note 2 - Recent Accounting Pronouncements</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 3 - Business Acquisitions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note3BusinessAcquisitions</Role>
      <ShortName>Note 3 - Business Acquisitions</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 4 - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note4FairValueMeasurements</Role>
      <ShortName>Note 4 - Fair Value Measurements</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 5 - Employee Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note5EmployeeBenefitPlans</Role>
      <ShortName>Note 5 - Employee Benefit Plans</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 6 - Net Income Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note6NetIncomePerShare</Role>
      <ShortName>Note 6 - Net Income Per Share</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 7 - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note7Inventories</Role>
      <ShortName>Note 7 - Inventories</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 8 - Asset Retirement Obligations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note8AssetRetirementObligations</Role>
      <ShortName>Note 8 - Asset Retirement Obligations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Note 9 - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note9CommitmentsandContingencies</Role>
      <ShortName>Note 9 - Commitments and Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 10 - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note10IncomeTaxes</Role>
      <ShortName>Note 10 - Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Note 11 - Long-term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note11LongtermDebt</Role>
      <ShortName>Note 11 - Long-term Debt</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Note 12 - Accumulated Other Comprehensive (Loss) Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note12AccumulatedOtherComprehensiveLossIncome</Role>
      <ShortName>Note 12 - Accumulated Other Comprehensive (Loss) Income</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Note 13 - Segment Reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note13SegmentReporting</Role>
      <ShortName>Note 13 - Segment Reporting</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Note 4 - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note4FairValueMeasurementsTables</Role>
      <ShortName>Note 4 - Fair Value Measurements (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>021 - Disclosure - Note 6 - Net Income Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note6NetIncomePerShareTables</Role>
      <ShortName>Note 6 - Net Income Per Share (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>022 - Disclosure - Note 7 - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note7InventoriesTables</Role>
      <ShortName>Note 7 - Inventories (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>023 - Disclosure - Note 8 - Asset Retirement Obligations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note8AssetRetirementObligationsTables</Role>
      <ShortName>Note 8 - Asset Retirement Obligations (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>024 - Disclosure - Note 9 - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note9CommitmentsandContingenciesTables</Role>
      <ShortName>Note 9 - Commitments and Contingencies (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>025 - Disclosure - Note 12 - Accumulated Other Comprehensive (Loss) Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note12AccumulatedOtherComprehensiveLossIncomeTables</Role>
      <ShortName>Note 12 - Accumulated Other Comprehensive (Loss) Income (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>026 - Disclosure - Note 13 - Segment Reporting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note13SegmentReportingTables</Role>
      <ShortName>Note 13 - Segment Reporting (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>027 - Disclosure - Note 3 - Business Acquisitions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note3BusinessAcquisitionsDetails</Role>
      <ShortName>Note 3 - Business Acquisitions (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>028 - Disclosure - Note 4 - Fair Value Measurements (Details) - Fair Value Measurments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/FairValueMeasurmentsTable</Role>
      <ShortName>Note 4 - Fair Value Measurements (Details) - Fair Value Measurments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>029 - Disclosure - Note 5 - Employee Benefit Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note5EmployeeBenefitPlansDetails</Role>
      <ShortName>Note 5 - Employee Benefit Plans (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>030 - Disclosure - Note 6 - Net Income Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note6NetIncomePerShareDetails</Role>
      <ShortName>Note 6 - Net Income Per Share (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>031 - Disclosure - Note 6 - Net Income Per Share (Details) - Summary of Earnings Per Share Basic Two Class Method</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/SummaryofEarningsPerShareBasicTwoClassMethodTable</Role>
      <ShortName>Note 6 - Net Income Per Share (Details) - Summary of Earnings Per Share Basic Two Class Method</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>032 - Disclosure - Note 6 - Net Income Per Share (Details) - Summary of Earnings Per Share Diluted Two Class Method</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/SummaryofEarningsPerShareDilutedTwoClassMethodTable</Role>
      <ShortName>Note 6 - Net Income Per Share (Details) - Summary of Earnings Per Share Diluted Two Class Method</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>033 - Disclosure - Note 7 - Inventories (Details) - Components of Inventory</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/ComponentsofInventoryTable</Role>
      <ShortName>Note 7 - Inventories (Details) - Components of Inventory</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>034 - Disclosure - Note 8 - Asset Retirement Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note8AssetRetirementObligationsDetails</Role>
      <ShortName>Note 8 - Asset Retirement Obligations (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>035 - Disclosure - Note 8 - Asset Retirement Obligations (Details) - Asset Retirement Obligations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/AssetRetirementObligationsTable</Role>
      <ShortName>Note 8 - Asset Retirement Obligations (Details) - Asset Retirement Obligations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>036 - Disclosure - Note 9 - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note9CommitmentsandContingenciesDetails</Role>
      <ShortName>Note 9 - Commitments and Contingencies (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>037 - Disclosure - Note 9 - Commitments and Contingencies (Details) - Changes to Environmental Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/ChangestoEnvironmentalLiabilitiesTable</Role>
      <ShortName>Note 9 - Commitments and Contingencies (Details) - Changes to Environmental Liabilities</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>038 - Disclosure - Note 9 - Commitments and Contingencies (Details) - Anticipated Payments and Insurance Proceeds of Identified Environmental Remediation Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/AnticipatedPaymentsandInsuranceProceedsofIdentifiedEnvironmentalRemediationLiabilitiesTable</Role>
      <ShortName>Note 9 - Commitments and Contingencies (Details) - Anticipated Payments and Insurance Proceeds of Identified Environmental Remediation Liabilities</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>039 - Disclosure - Note 10 - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note10IncomeTaxesDetails</Role>
      <ShortName>Note 10 - Income Taxes (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>040 - Disclosure - Note 11 - Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note11LongtermDebtDetails</Role>
      <ShortName>Note 11 - Long-term Debt (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>041 - Disclosure - Note 12 - Accumulated Other Comprehensive (Loss) Income (Details) - Components of Accumulated Other Comprehensive Income, Net of Tax</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/ComponentsofAccumulatedOtherComprehensiveIncomeNetofTaxTable</Role>
      <ShortName>Note 12 - Accumulated Other Comprehensive (Loss) Income (Details) - Components of Accumulated Other Comprehensive Income, Net of Tax</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>042 - Disclosure - Note 13 - Segment Reporting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/Note13SegmentReportingDetails</Role>
      <ShortName>Note 13 - Segment Reporting (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>043 - Disclosure - Note 13 - Segment Reporting (Details) - Segment Reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unifirst.com/role/SegmentReportingTable</Role>
      <ShortName>Note 13 - Segment Reporting (Details) - Segment Reporting</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Process Flow-Through: 001 - Statement - Consolidated Statements of Income (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 002 - Statement - Consolidated Statements of Comprehensive Income (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 003 - Statement - Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals)</Log>
    <Log type="Info">Process Flow-Through: 004 - Statement - Consolidated Balance Sheets (Unaudited)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'May 25, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Aug. 25, 2012'</Log>
    <Log type="Info">Process Flow-Through: 005 - Statement - Consolidated Balance Sheets (Unaudited) (Parentheticals)</Log>
    <Log type="Info">Process Flow-Through: 006 - Statement - Consolidated Statements of Cash Flows (Unaudited)</Log>
  </Logs>
  <InputFiles>
    <File>unf-20140531.xml</File>
    <File>unf-20140531.xsd</File>
    <File>unf-20140531_cal.xml</File>
    <File>unf-20140531_def.xml</File>
    <File>unf-20140531_lab.xml</File>
    <File>unf-20140531_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
