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Segment Reporting - Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands | Aug. 28, 2021 | Aug. 29, 2020
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Revenues From External Customers And Long Lived Assets [Line Items] |  |
Long-lived assets | $ 1,277,273 | $ 1,229,693
United States |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Long-lived assets | 1,219,760 | 1,177,107
Europe, Canada, Mexico and Nicaragua |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Long-lived assets | $ 57,513 | $ 52,586

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=unf_EuropeCanadaMexicoAndNicaraguaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |