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v2.4.0.8

Note 7. Asset Retirement Obligations (Details) | 9 Months Ended
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May 25, 2013
Minimum [Member] |
Note 7. Asset Retirement Obligations (Details) [Line Items] |
Asset Retirement Obligation Remaining Lives | 1 year
Maximum [Member] |
Note 7. Asset Retirement Obligations (Details) [Line Items] |
Asset Retirement Obligation Remaining Lives | 31 years

X
- Definition This element describes the minimum years the Company will discount the liability of estimated future costs to decommission one of its facilities. + References No definition available. + Details
Name: | unf_AssetRetirementObligationRemainingLives
Namespace Prefix: | unf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | unf_Note7AssetRetirementObligationsDetailsLineItems
Namespace Prefix: | unf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration