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SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
 3 Months Ended 6 Months Ended
Jan. 31, 2015
Nov. 01, 2014
Feb. 01, 2014
Jan. 31, 2015
Feb. 01, 2014
Significant Accounting Policies          
Total outbound shipping and handling costs $ 112,700,000us-gaap_ShippingHandlingAndTransportationCosts   $ 98,800,000us-gaap_ShippingHandlingAndTransportationCosts $ 224,700,000us-gaap_ShippingHandlingAndTransportationCosts $ 195,100,000us-gaap_ShippingHandlingAndTransportationCosts
Reduction to net sales $ 7,736,000unfi_CorrectionofPriorPeriodErrors $ 1,600,000unfi_CorrectionofPriorPeriodErrors   $ 9,326,000unfi_CorrectionofPriorPeriodErrors