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Goodwill and Other Intangible Assets - Narrative (Details) $ in Millions | Feb. 23, 2019 USD ($)
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Technology-Based Intangible Assets [Member] | Plant property Equipment [Member] |
Intangible Assets, Gross (Excluding Goodwill) | $ 11.6

X
- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
Name: | us-gaap_IntangibleAssetsGrossExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TechnologyBasedIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=unf_PlantPropertyEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |