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v3.21.2

Asset Retirement Obligations - Narrative (Details) | 12 Months Ended
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Aug. 28, 2021
Asset Retirement Obligations [Line Items] |
Estimated impact of inflation per year | 3.00%
Credit adjusted risk free rates, minimum | 7.00%
Credit adjusted risk free rates, maximum | 7.50%
Minimum |
Asset Retirement Obligations [Line Items] |
Remaining lives | 1 year
Maximum |
Asset Retirement Obligations [Line Items] |
Remaining lives | 25 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 [Line Items] for Asset Retirement Obligations [Table] + References No definition available. + Details
Name: | unf_AssetRetirementObligationsLineItems
Namespace Prefix: | unf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Credit adjusted risk free rates maximum rate. + References No definition available. + Details
Name: | unf_CreditAdjustedRiskFreeRatesMaximumRate
Namespace Prefix: | unf_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Credit adjusted risk free rates minimum rate. + References No definition available. + Details
Name: | unf_CreditAdjustedRiskFreeRatesMinimumRate
Namespace Prefix: | unf_
Data Type: | dtr-types: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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |