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Note 10 - Commitments and Contingencies (Details) - Changes to Environmental Liabilities - USD ($) $ in Thousands	9 Months Ended
	May. 30, 2015	May. 31, 2014
Changes to Environmental Liabilities [Abstract]
Balance	$ 19,846
Payments made for which reserves had been provided	(1,806)
Insurance proceeds received	96
Interest accretion	452	$ 537
Revision in estimates	3,025
Change in discount rates	399
Balance	$ 22,012

X

- Definition

Amount of accretion expense recognized in the income statement during the period that is associated with environmental contingencies. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	unf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Amount of discount applied to the future cost of environmental remediation to present value.

+ References

No definition available.

+ Details

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

X

- Definition

Recorded amount of the individual components comprising the asset for insurance recoveries related to environmental remediation obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	unf_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 450



-SubTopic 20



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 410



-SubTopic 30



-Section 50



-Paragraph 7



-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 450



-SubTopic 20



-Section 25



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346

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Period Type:	instant

X

- Definition

The Increase or Decrease in the accrual for environmental loss in the period from revisions in estimates to existing obligations. The amount does not relate to changes in the environmental accrual related to business acquisitions or divestitures, or to currency movements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 450



-SubTopic 20



-Section S99



-Paragraph 1



-Subparagraph (SAB TOPIC 5.Y.Q2)



-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

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X

- Definition

The aggregate amount disbursed during the reporting period to settle environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 450



-SubTopic 20



-Section S99



-Paragraph 1



-Subparagraph (SAB TOPIC 5.Y.Q2)



-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

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