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v2.4.1.9

Note 9 - Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 0 Months Ended
--- | --- | ---
Nov. 29, 2014 | Jan. 01, 2015
Note 9 - Commitments and Contingencies (Details) [Line Items] |  |
Number of Sites Related to Former Operations with Environmental Issues | 3 unf_NumberOfSitesRelatedToFormerOperationsWithEnvironmentalIssues |
Estimated Impact Of Inflation Per Year | 3.00%unf_EstimatedImpactOfInflationPerYear |
Proceeds from Legal Settlements (in Dollars) | $ 0.3 us-gaap_ProceedsFromLegalSettlements |
Escrow Deposit (in Dollars) | 2.9 us-gaap_EscrowDeposit |
Damages from Product Defects [Member] | NECC MDL [Member] | Pending Litigation [Member] |  |
Note 9 - Commitments and Contingencies (Details) [Line Items] |  |
Loss Contingency, Damages Sought, Value (in Dollars) |  | $ 135 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = unf_NECCMDLMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_DamagesFromProductDefectsMember
Minimum [Member] |  |
Note 9 - Commitments and Contingencies (Details) [Line Items] |  |
Risk Free Rates Of Interest Used To Discount Remediation Costs | 2.20%unf_RiskFreeRatesOfInterestUsedToDiscountRemediationCosts / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] |  |
Note 9 - Commitments and Contingencies (Details) [Line Items] |  |
Risk Free Rates Of Interest Used To Discount Remediation Costs | 2.90%unf_RiskFreeRatesOfInterestUsedToDiscountRemediationCosts / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- 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
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Namespace Prefix: | unf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | unf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the number of sites related to former operations that are subject to remediation of certain hazardous or toxic substances. + References No definition available. + Details
Name: | unf_NumberOfSitesRelatedToFormerOperationsWithEnvironmentalIssues
Namespace Prefix: | unf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represent the risk-free rate of interest used to discount the remediation costs. A risk-free rate represents the interest that an investor would expect from an absolutely risk-free investment over a given period of time. + References No definition available. + Details
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Namespace Prefix: | unf_
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + 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 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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Balance Type: | debit
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- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Details
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- Details
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Period Type: |

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- Details
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