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Note 5 - Derivative Instruments and Hedging Activities (Details) |  |  |  | 1 Months Ended |  |
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Feb. 28, 2015 USD ($) | Aug. 30, 2014 USD ($) | Feb. 28, 2015 Forward Contracts [Member] Current Accrued Liabilities [Member] USD ($) | Feb. 28, 2015 Forward Contracts [Member] USD ($) | Feb. 28, 2015 Forward Contracts [Member] CAD | Jan. 31, 2015 Forward Contracts [Member] CAD | Jan. 31, 2015 Canadian Dollars to US Dollars [Member]
Note 5 - Derivative Instruments and Hedging Activities (Details) [Line Items] |  |  |  |  |  |  |  |
Derivative, Number of Instruments Held |  |  |  |  |  |  | 16 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember |
Derivative, Notional Amount (in Dollars) |  |  |  |  |  | 31,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 31,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember |
Derivative, Forward Exchange Rate |  |  |  |  |  |  |  | 0.7825 us-gaap_DerivativeForwardExchangeRate1 / us-gaap_CurrencyAxis = unf_CanadianDollarsToUSDollarsMember
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  |  |  | 600,000 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = unf_CurrentAccruedLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (21,335,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (2,533,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | [1] |  | (600,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember |  |  |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  |  |  | $ (600,000)us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember |  |  |
[1] | Derived from audited financial statements

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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