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Note 9 - Commitments and Contingencies (Tables) | 3 Months Ended
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Nov. 29, 2014
Commitments and Contingencies Disclosure [Abstract] |
Schedule Of Environmental Liabilities [TableTextBlock] |
|  | November 29, 2014 |
Beginning balance as of August 30, 2014 |  | $ | 19,846 |
Costs incurred for which reserves have been provided |  |  | (460 | )
Insurance proceeds |  |  | 48 |
Interest accretion |  |  | 151 |
Change in discount rates |  |  | 382 |
Balance as of November 29, 2014 |  | $ | 19,967 |
Schedule Of Environmental Remediation Liabilities [Table Text Block] |
(In t housands) |  | 201 5 |  |  | 201 6 |  |  | 201 7 |  |  | 201 8 |  |  | 201 9 |  |  | Thereafter |  |  | Total |
Estimated costs – current dollars |  | $ | 4,758 |  |  | $ | 1,915 |  |  | $ | 1,663 |  |  | $ | 745 |  |  | $ | 863 |  |  | $ | 12,407 |  |  | $ | 22,351 |
Estimated insurance proceeds |  |  | (124 | ) |  |  | (159 | ) |  |  | (173 | ) |  |  | (159 | ) |  |  | (173 | ) |  |  | (1,430 | ) |  |  | (2,218 | )
Net anticipated costs |  | $ | 4,634 |  |  | $ | 1,756 |  |  | $ | 1,490 |  |  | $ | 586 |  |  | $ | 690 |  |  | $ | 10,977 |  |  | $ | 20,133 |
Effect of inflation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,226 |
Effect of discounting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,392 | )
Balance as of November 29, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 19,967 |

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- Definition Tabular disclosure of the components of the environmental liabilities as of period end. + References No definition available. + Details
Name: | unf_ScheduleOfEnvironmentalLiabilitiesTableTextBlock
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
Period Type: | duration

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