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Note 9 - Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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May 31, 2014
Note 9 - Commitments and Contingencies (Details) [Line Items] |
Number Of Sites Related To Former Operations With Environmental Issues | 3
Estimated Impact Of Inflation Per Year | 3.00%
Proceeds from Legal Settlements (in Dollars) | $ 0.3
Escrow Deposit (in Dollars) | $ 3.0
Loss Contingency, Number of Defendants | 1
Minimum [Member] |
Note 9 - Commitments and Contingencies (Details) [Line Items] |
Risk Free Rates Of Interest Used To Discount Remediation Costs | 2.50%
Maximum [Member] |
Note 9 - Commitments and Contingencies (Details) [Line Items] |
Risk Free Rates Of Interest Used To Discount Remediation Costs | 3.30%

X
- Definition This element represents the percentage added to estimated current cost of decommissioning one of the Company's facilities based on future estimated inflation rate. + References No definition available. + Details
Name: | unf_EstimatedImpactOfInflationPerYear
Namespace Prefix: | unf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | unf_Note9CommitmentsandContingenciesDetailsLineItems
Namespace Prefix: | unf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the number of sites related to former operations that are subject to remediation of certain hazardous or toxic substances. + References No definition available. + Details
Name: | unf_NumberOfSitesRelatedToFormerOperationsWithEnvironmentalIssues
Namespace Prefix: | unf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represent the risk-free rate of interest used to discount the remediation costs. A risk-free rate represents the interest that an investor would expect from an absolutely risk-free investment over a given period of time. + References No definition available. + Details
Name: | unf_RiskFreeRatesOfInterestUsedToDiscountRemediationCosts
Namespace Prefix: | unf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_EscrowDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of defendants named in a legal action. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfDefendants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
Name: | us-gaap_ProceedsFromLegalSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration