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Note 9 - Commitments and Contingencies (Details) - Changes to Environmental Liabilities (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Nov. 29, 2014 | Nov. 30, 2013
Changes to Environmental Liabilities [Abstract] |  |
Balance | $ 19,846 us-gaap_AccrualForEnvironmentalLossContingencies |
Costs incurred for which reserves have been provided | (460)us-gaap_AccrualForEnvironmentalLossContingenciesPayments |
Insurance proceeds | 48 unf_RecordedInsuranceEnvironmentalRecoveriesAmount |
Interest accretion | 151 unf_AccretionOnEnvironmentalContingencies | 179 unf_AccretionOnEnvironmentalContingencies
Change in discount rates | 382 unf_EnvironmentalLiabilitiesChangesInDiscountRates |
Balance | $ 19,967 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
Namespace Prefix: | unf_
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

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

X
- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration