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LONG-TERM DEBT (Details) (USD $)
3 Months Ended 6 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Jan. 31, 2015
Feb. 01, 2014
Aug. 02, 2014
Long-term debt instrument          
Proceeds from issuance of long-term debt     $ 150,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt $ 0us-gaap_ProceedsFromIssuanceOfLongTermDebt  
Repayments of Long-term Debt     5,539,000us-gaap_RepaymentsOfLongTermDebt 396,000us-gaap_RepaymentsOfLongTermDebt  
Long term debt, including current portion, carrying value 190,379,000us-gaap_LongTermDebt   190,379,000us-gaap_LongTermDebt   33,500,000us-gaap_LongTermDebt
Interest expense 3,554,000us-gaap_InterestExpense 1,782,000us-gaap_InterestExpense 6,809,000us-gaap_InterestExpense 3,636,000us-gaap_InterestExpense  
Term loan          
Long-term debt instrument          
Repayments of Long-term Debt     2,500,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= unfi_RealestatebackedtermloanDomain
   
Long term debt, including current portion, carrying value 145,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= unfi_RealestatebackedtermloanDomain
  145,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= unfi_RealestatebackedtermloanDomain
   
Capital lease obligation          
Long-term debt instrument          
Interest Expense, Lessee, Assets under Capital Lease 100,000us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
       
Lease Term     10 years    
Effective interest rate on debt 12.37%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
  12.37%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
   
Capital Lease Obligation 12,400,000us-gaap_CapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
  12,400,000us-gaap_CapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
   
Sale Leaseback Financing Obligation          
Long-term debt instrument          
Long term debt, including current portion, carrying value 33,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= unfi_SaleLeasebackFinancingObligationMember
  33,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= unfi_SaleLeasebackFinancingObligationMember
   
Effective interest rate on debt 7.32%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= unfi_SaleLeasebackFinancingObligationMember
  7.32%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= unfi_SaleLeasebackFinancingObligationMember
   
Interest expense 600,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= unfi_SaleLeasebackFinancingObligationMember
  1,200,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= unfi_SaleLeasebackFinancingObligationMember
   
Minimum | Term loan          
Long-term debt instrument          
Long term debt, including current portion, carrying value 10,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= unfi_RealestatebackedtermloanDomain
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
  10,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= unfi_RealestatebackedtermloanDomain
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum | Term loan          
Long-term debt instrument          
Long term debt, including current portion, carrying value $ 50,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= unfi_RealestatebackedtermloanDomain
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
  $ 50,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= unfi_RealestatebackedtermloanDomain
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Base Rate [Member] | Term loan          
Long-term debt instrument          
Debt Instrument, Description of Variable Rate Basis     Administrative Agent's prime rate    
initial applicable margin     1.50%unfi_Initialapplicablemargin
/ us-gaap_DebtInstrumentAxis
= unfi_RealestatebackedtermloanDomain
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
Federal Funds Effective Swap Rate [Member] | Term loan          
Long-term debt instrument          
Debt Instrument, Description of Variable Rate Basis     overnight federal funds effective rate    
Debt Instrument, Basis Spread on Variable Rate     0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= unfi_RealestatebackedtermloanDomain
/ us-gaap_VariableRateAxis
= us-gaap_FederalFundsEffectiveSwapRateMember
   
One-month LIBOR | Term loan          
Long-term debt instrument          
Debt Instrument, Description of Variable Rate Basis     one-month LIBOR    
Debt Instrument, Basis Spread on Variable Rate     1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= unfi_RealestatebackedtermloanDomain
/ us-gaap_VariableRateAxis
= unfi_OnemonthLIBORMember
   
London Interbank Offered Rate (LIBOR) [Member] | Term loan          
Long-term debt instrument          
Debt Instrument, Description of Variable Rate Basis     one, two, three or six months or, if approved by all affected lenders, nine months    
initial applicable margin     2.50%unfi_Initialapplicablemargin
/ us-gaap_DebtInstrumentAxis
= unfi_RealestatebackedtermloanDomain
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember