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EQUITY PLANS (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Aug. 02, 2014
Aug. 03, 2013
Jul. 28, 2012
Restricted stock awards and units      
Number of Shares      
Outstanding at July 28, 2012 (in shares) 680,212us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
   
Granted (in shares) 318,575us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
   
Vested (in shares) (286,879)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
   
Forfeited (in shares) (71,171)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
   
Outstanding at August 3, 2013 (in shares) 640,737us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
680,212us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
 
Weighted Average Grant-Date Fair Value      
Outstanding at July 28, 2012 (in dollars per share) $ 44.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
   
Granted (in dollars per share) $ 67.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
   
Vested (in dollars per share) $ 43.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
   
Forfeited (in dollars per share) $ 47.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
   
Outstanding at August 3, 2013 (in dollars per share) $ 55.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
$ 44.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
 
Intrinsic value $ 16.9unfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedInPeriodIntrinsicValue
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
$ 16.7unfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedInPeriodIntrinsicValue
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
$ 14.2unfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedInPeriodIntrinsicValue
/ us-gaap_AwardTypeAxis
= unfi_RestrictedStockAndRestrictedStockUnitAwardsMember
Graded vesting period for employees 4 years    
Performance-based share awards      
Number of Shares      
Granted (in shares) 22,229us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= unfi_PerformanceAwardMember
25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= unfi_PerformanceAwardMember
25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= unfi_PerformanceAwardMember
Vested (in shares)     (44,110)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= unfi_PerformanceAwardMember
Weighted Average Grant-Date Fair Value      
Number of additional shares issued if performance exceeded specified targeted levels 22,229us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= unfi_PerformanceAwardMember
25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= unfi_PerformanceAwardMember
25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= unfi_PerformanceAwardMember
Fair value of restricted shares and units vested     2.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= unfi_PerformanceAwardMember
Performance units      
Number of Shares      
Granted (in shares)   5,123us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= unfi_PerformanceUnitsAwardMember
12,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= unfi_PerformanceUnitsAwardMember
Weighted Average Grant-Date Fair Value      
Intrinsic value     1.7unfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedInPeriodIntrinsicValue
/ us-gaap_AwardTypeAxis
= unfi_PerformanceUnitsAwardMember
Number of additional shares issued if performance exceeded specified targeted levels 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= unfi_PerformanceUnitsAwardMember
5,123us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= unfi_PerformanceUnitsAwardMember
12,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= unfi_PerformanceUnitsAwardMember
Performance Shares Units      
Number of Shares      
Granted (in shares)   695us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= unfi_PerformanceSharesUnitsMember
 
Vested (in shares) (19,396)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= unfi_PerformanceSharesUnitsMember
(30,818)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= unfi_PerformanceSharesUnitsMember
 
Weighted Average Grant-Date Fair Value      
Granted (in dollars per share) $ 67.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unfi_PerformanceSharesUnitsMember
$ 52.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unfi_PerformanceSharesUnitsMember
$ 37.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unfi_PerformanceSharesUnitsMember
Intrinsic value 1.3unfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedInPeriodIntrinsicValue
/ us-gaap_AwardTypeAxis
= unfi_PerformanceSharesUnitsMember
1.6unfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedInPeriodIntrinsicValue
/ us-gaap_AwardTypeAxis
= unfi_PerformanceSharesUnitsMember
 
Fair value of restricted shares and units vested $ 1.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= unfi_PerformanceSharesUnitsMember
$ 1.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= unfi_PerformanceSharesUnitsMember
 
New performance-based equity compensation arrangement with performance-based vesting component | Executive-leadership team      
Number of Shares      
Granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= unfi_NewPerformanceBasedEquityCompensationArrangementAndPerformanceBasedVestingComponentMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
23,882us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= unfi_NewPerformanceBasedEquityCompensationArrangementAndPerformanceBasedVestingComponentMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
 
Weighted Average Grant-Date Fair Value      
Graded vesting period for employees 2 years    
Percentage of eligibility performance-based stock units based on grant date fair value 33.00%unfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEligiblePercentageOfPerformanceBasedStockUnitsEqualToGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unfi_NewPerformanceBasedEquityCompensationArrangementAndPerformanceBasedVestingComponentMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
   
Percentage of eligibility performance-based stock units based on annual base salary 125.00%unfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEligiblePercentageOfPerformanceBasedStockUnitsSumOfAnnualBaseSalary
/ us-gaap_AwardTypeAxis
= unfi_NewPerformanceBasedEquityCompensationArrangementAndPerformanceBasedVestingComponentMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
   
Percentage of eligibility performance-based stock units based on cash-based performance award 50.00%unfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEligiblePercentageOfPerformanceBasedStockUnitsEqualToCashBasedPerformanceAward
/ us-gaap_AwardTypeAxis
= unfi_NewPerformanceBasedEquityCompensationArrangementAndPerformanceBasedVestingComponentMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
   
Percentage of additional grants increased (as a percent) 100.00%unfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPercentageOfAdditionalGrantsIncreased
/ us-gaap_AwardTypeAxis
= unfi_NewPerformanceBasedEquityCompensationArrangementAndPerformanceBasedVestingComponentMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember