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Note 10 - Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 28, 2015 | Feb. 28, 2015 | Feb. 23, 2015
Note 10 - Commitments and Contingencies (Details) [Line Items] |  |  |
Number of Sites Related to Former Operations with Environmental Issues |  | 3 unf_NumberOfSitesRelatedToFormerOperationsWithEnvironmentalIssues |
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) | $ 3.6 us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease |  |
Estimated Impact Of Inflation Per Year |  | 3.00%unf_EstimatedImpactOfInflationPerYear |
Proceeds from Legal Settlements |  | 0.3 us-gaap_ProceedsFromLegalSettlements |
Escrow Deposit | 2.9 us-gaap_EscrowDeposit | 2.9 us-gaap_EscrowDeposit |
NECC MDL [Member] |  |  |
Note 10 - Commitments and Contingencies (Details) [Line Items] |  |  |
Escrow Deposit |  |  | 30.0 us-gaap_EscrowDeposit / us-gaap_LitigationCaseAxis = unf_NECCMDLMember
Insurer Payments to Creditors in Chapter 11 Settlement |  |  | $ 30.5 unf_InsurerPaymentsToCreditorsInChapter11Settlement / us-gaap_LitigationCaseAxis = unf_NECCMDLMember
Minimum [Member] |  |  |
Note 10 - Commitments and Contingencies (Details) [Line Items] |  |  |
Risk Free Rates Of Interest Used To Discount Remediation Costs |  | 2.00%unf_RiskFreeRatesOfInterestUsedToDiscountRemediationCosts / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] |  |  |
Note 10 - Commitments and Contingencies (Details) [Line Items] |  |  |
Risk Free Rates Of Interest Used To Discount Remediation Costs |  | 2.60%unf_RiskFreeRatesOfInterestUsedToDiscountRemediationCosts / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- 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
- Definition Represents the amount the company's insurance is paying to the creditors as part of the chapter 11 settlement. + References No definition available. + Details
Name: | unf_InsurerPaymentsToCreditorsInChapter11Settlement
Namespace Prefix: | unf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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 Increase (decrease) in the accrual for environmental loss contingencies during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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 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

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- Details
Name: | us-gaap_LitigationCaseAxis=unf_NECCMDLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |