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Note 9 - Commitments and Contingencies (Tables) | 6 Months Ended
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Mar. 01, 2014
Commitments and Contingencies Disclosure [Abstract] |
Schedule Of Environmental Liabilities [TableTextBlock] |
|  | March 1, 2014 |
Beginning balance as of August 31, 2013 |  | $ | 19,680 |
Payments made for which reserves had been provided |  |  | (1,109 | )
Insurance proceeds received |  |  | 535 |
Interest accretion |  |  | 358 |
Revision in estimates |  |  | (21 | )
Change in discount rates |  |  | 193 |
Balance as of March 1, 2014 |  | $ | 19,636 |
Schedule Of Environmental Remediation Liabilities [Table Text Block] |
(In thousands) |  | 2014 |  |  | 2015 |  |  | 2016 |  |  | 2017 |  |  | 2018 |  |  | Thereafter |  |  | Total |
Estimated costs – current dollars |  | $ | 4,563 |  |  | $ | 2,620 |  |  | $ | 1,887 |  |  | $ | 865 |  |  | $ | 797 |  |  | $ | 12,421 |  |  | $ | 23,153 |
Estimated insurance proceeds |  |  | — |  |  |  | (173 | ) |  |  | (159 | ) |  |  | (173 | ) |  |  | (159 | ) |  |  | (1,593 | ) |  |  | (2,257 | )
Net anticipated costs |  | $ | 4,563 |  |  | $ | 2,447 |  |  | $ | 1,728 |  |  | $ | 692 |  |  | $ | 638 |  |  | $ | 10,828 |  |  | $ | 20,896 |
Effect of inflation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,413 |
Effect of discounting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,673 | )
Balance as of March 1, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 19,636 |

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- Definition Tabular disclosure of the components of the environmental liabilities as of period end. + References No definition available. + Details
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Namespace Prefix: | unf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of environmental remediation costs less estimated insurance proceeds including the effects of inflation and discounting the costs to present value. + References No definition available. + Details
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Namespace Prefix: | unf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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