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Note 10 - Commitments and Contingencies (Details) - Changes to Environmental Liabilities (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Feb. 28, 2015 | Mar. 01, 2014
Changes to Environmental Liabilities [Abstract] |  |
Balance | $ 19,846 us-gaap_AccrualForEnvironmentalLossContingencies |
Payments made for which reserves had been provided | (1,683)us-gaap_AccrualForEnvironmentalLossContingenciesPayments |
Insurance proceeds received | 65 unf_RecordedInsuranceEnvironmentalRecoveriesAmount |
Interest accretion | 302 unf_AccretionOnEnvironmentalContingencies | 358 unf_AccretionOnEnvironmentalContingencies
Revision in estimates | 3,025 us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates |
Change in discount rates | 946 unf_EnvironmentalLiabilitiesChangesInDiscountRates |
Balance | $ 22,501 us-gaap_AccrualForEnvironmentalLossContingencies |

X
- Definition Amount of accretion expense recognized in the income statement during the period that is associated with environmental contingencies. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References No definition available. + Details
Name: | unf_AccretionOnEnvironmentalContingencies
Namespace Prefix: | unf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | unf_ChangesToEnvironmentalLiabilitiesAbstract
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discount applied to the future cost of environmental remediation to present value. + References No definition available. + Details
Name: | unf_EnvironmentalLiabilitiesChangesInDiscountRates
Namespace Prefix: | unf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Recorded amount of the individual components comprising the asset for insurance recoveries related to environmental remediation obligations. + References No definition available. + Details
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Namespace Prefix: | unf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The Increase or Decrease in the accrual for environmental loss in the period from revisions in estimates to existing obligations. The amount does not relate to changes in the environmental accrual related to business acquisitions or divestitures, or to currency movements. + 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
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- Definition The aggregate amount disbursed during the reporting period to settle environmental loss contingencies. + 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
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