XML 34 R36.htm IDEA: XBRL DOCUMENT 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 3unf_NumberOfSitesRelatedToFormerOperationsWithEnvironmentalIssues  
Estimated Impact Of Inflation Per Year 3.00%unf_EstimatedImpactOfInflationPerYear  
Proceeds from Legal Settlements (in Dollars) $ 0.3us-gaap_ProceedsFromLegalSettlements  
Escrow Deposit (in Dollars) 2.9us-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)   $ 135us-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