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Note 9 - Commitments and Contingencies (Tables) | 3 Months Ended
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Nov. 30, 2013
Commitments and Contingencies Disclosure [Abstract] |
Schedule Of Environmental Liabilities [TableTextBlock] |
|  | November 30, 2013 |
Beginning balance as of August 31, 2013 |  | $ | 19,680 |
Payments made for which reserves had been provided |  |  | (726 | )
Insurance proceeds received |  |  | 485 |
Interest accretion |  |  | 179 |
Change in discount rates |  |  | (188 | )
Balance as of November 30, 2013 |  | $ | 19,430 |
Schedule Of Environmental Remediation Liabilities [Table Text Block] |
|  | 2014 |  |  | 2015 |  |  | 2016 |  |  | 2017 |  |  | 2018 |  |  | Thereafter |  |  | Total |
(In thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated costs – current dollars |  | $ | 4,918 |  |  | $ | 2,620 |  |  | $ | 1,887 |  |  | $ | 865 |  |  | $ | 797 |  |  | $ | 12,420 |  |  | $ | 23,507 |
Estimated insurance proceeds |  |  | — |  |  |  | (173 | ) |  |  | (159 | ) |  |  | (173 | ) |  |  | (159 | ) |  |  | (1,593 | ) |  |  | (2,257 | )
Net anticipated costs |  | $ | 4,918 |  |  | $ | 2,447 |  |  | $ | 1,728 |  |  | $ | 692 |  |  | $ | 638 |  |  | $ | 10,827 |  |  | $ | 21,250 |
Effect of inflation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,234 |
Effect of discounting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,054 | )
Balance as of November 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 19,430 |

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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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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
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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