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Note 10 - Asset Retirement Obligations (Details) | 12 Months Ended
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Aug. 31, 2013
Note 10 - Asset Retirement Obligations (Details) [Line Items] |
Estimated Impact Of Inflation Per Year | 3.00%
Credit Adjusted Risk Free Rates Minimum Rate | 7.00%
Credit Adjusted Risk Free Rates Maximum Rate | 7.50%
Minimum [Member] |
Note 10 - Asset Retirement Obligations (Details) [Line Items] |
Asset Retirement Obligation Remaining Lives | 8 years
Maximum [Member] |
Note 10 - 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
- Definition This element represents the maximum rate that a liability is discounted, using a credit-adjusted risk-free rate. Credit-adjusting the risk-free rate means adding to the Treasury rates some amount of additional interest-rate basis points to reflect the fact that companies might default on their debt obligations. + References No definition available. + Details
Name: | unf_CreditAdjustedRiskFreeRatesMaximumRate
Namespace Prefix: | unf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the minimum rate that a liability is discounted, using a credit-adjusted risk-free rate. Credit-adjusting the risk-free rate means adding to the Treasury rates some amount of additional interest-rate basis points to reflect the fact that companies might default on their debt obligations. + References No definition available. + Details
Name: | unf_CreditAdjustedRiskFreeRatesMinimumRate
Namespace Prefix: | unf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the percentage added to estimated current cost of decommissioning one of the Company's facilities based on future estimated inflation rate. + References No definition available. + Details
Name: | unf_EstimatedImpactOfInflationPerYear
Namespace Prefix: | unf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | unf_Note10AssetRetirementObligationsDetailsLineItems
Namespace Prefix: | unf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration