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Revenue Recognition - Schedule of Change in Allowance for Credit Losses (Details) $ in Thousands	6 Months Ended
	Feb. 28, 2026 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 6,802
Current period provision	3,851
Write-offs and other	(3,373)
Ending balance	$ 7,280

X

- Definition

Financing receivable allowance for credit losses writeOffs and other.

+ References

No definition available.

+ Details

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Namespace Prefix:	unf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

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-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
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X

- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

+ References

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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