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v2.4.1.9

Note 9 - Asset Retirement Obligations (Details) | 6 Months Ended
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Feb. 28, 2015
Minimum [Member] |
Note 9 - Asset Retirement Obligations (Details) [Line Items] |
Asset Retirement Obligation Remaining Lives | 6 years
Maximum [Member] |
Note 9 - Asset Retirement Obligations (Details) [Line Items] |
Asset Retirement Obligation Remaining Lives | 29 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_Note9AssetRetirementObligationsDetailsLineItems
Namespace Prefix: | unf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |