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ACQUISITIONS (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Jan. 31, 2015
Feb. 01, 2014
Nov. 01, 2014
Acquisitions          
Net sales $ 2,016,546,000us-gaap_SalesRevenueGoodsNet $ 1,646,041,000us-gaap_SalesRevenueGoodsNet $ 4,009,022,000us-gaap_SalesRevenueGoodsNet $ 3,248,052,000us-gaap_SalesRevenueGoodsNet  
Payments to Acquire Businesses, Net of Cash Acquired     (7,987,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (23,005,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired  
Tony's Fine Foods [Member]          
Acquisitions          
Goodwill, Purchase Accounting Adjustments 3,200,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= unfi_TonysFineFoodsMember
  2,700,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= unfi_TonysFineFoodsMember
   
Net sales 232,600,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_BusinessAcquisitionAxis
= unfi_TonysFineFoodsMember
  447,400,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_BusinessAcquisitionAxis
= unfi_TonysFineFoodsMember
   
Purchase Accounting Adjustments [Domain]          
Acquisitions          
Identifiable intangible assets         900,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= unfi_PurchaseAccountingAdjustmentsDomain
Customer relationship         700,000us-gaap_FiniteLivedCustomerListsGross
/ us-gaap_BusinessAcquisitionAxis
= unfi_PurchaseAccountingAdjustmentsDomain
Property and equipment         800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= unfi_PurchaseAccountingAdjustmentsDomain
Goodwill, Purchase Accounting Adjustments $ 3,100,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= unfi_PurchaseAccountingAdjustmentsDomain
      $ 100,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= unfi_PurchaseAccountingAdjustmentsDomain