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Note 10 - Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Aug. 30, 2014 | Aug. 31, 2013 | Aug. 25, 2012
Note 10 - Commitments and Contingencies (Details) [Line Items] |  |  |
Operating Leases, Rent Expense | $ 9.9 | $ 8.7 | $ 7.7
Number Of Sites Related To Former Operations With Environmental Issues | 3 |  |
Estimated Impact Of Inflation Per Year | 3.00% |  |
Proceeds from Legal Settlements | 0.3 |  |
Escrow Deposit | 2.9 |  |
Letters of Credit Outstanding, Amount | $ 49.6 | $ 47.1 |
Minimum [Member] |  |  |
Note 10 - Commitments and Contingencies (Details) [Line Items] |  |  |
Risk Free Rates Of Interest Used To Discount Remediation Costs | 2.40% |  |
Maximum [Member] |  |  |
Note 10 - Commitments and Contingencies (Details) [Line Items] |  |  |
Risk Free Rates Of Interest Used To Discount Remediation Costs | 3.10% |  |

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_Note10CommitmentsandContingenciesDetailsLineItems
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 Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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