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INCOME TAXES (Details 2) (USD $)
12 Months Ended
Aug. 02, 2014
Aug. 03, 2013
Operating loss carryforwards    
Valuation allowances related to deferred tax assets certain state tax credit carryforwards $ 0us-gaap_DeferredTaxAssetsValuationAllowance $ 819,000us-gaap_DeferredTaxAssetsValuationAllowance
Tax benefits recognized related to tax examinations closed during the fiscal yea 300,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions 4,400,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions
Undistributed earnings of non-U.S. subsidiaries 13,700,000us-gaap_UndistributedEarningsOfForeignSubsidiaries  
Federal tax authority    
Operating loss carryforwards    
Net operating loss carryforwards 3,700,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
 
Annual limitation on use of operating loss carryforward amounts 300,000unfi_OperatingLossCarryforwardsLimitationsOnUseAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
 
State income tax authority    
Operating loss carryforwards    
Net operating loss carryforwards $ 500,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember