CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Aug. 02, 2014	Aug. 03, 2013	Jul. 28, 2012
Net Income	$ 125,482us-gaap_NetIncomeLoss	$ 107,854us-gaap_NetIncomeLoss	$ 91,342us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48,758	42,398	39,560
Deferred income tax expense (benefit)	881us-gaap_DeferredIncomeTaxExpenseBenefit	6,780us-gaap_DeferredIncomeTaxExpenseBenefit	(6,115)us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation	14,608us-gaap_ShareBasedCompensation	15,104us-gaap_ShareBasedCompensation	11,372us-gaap_ShareBasedCompensation
Excess tax benefit from share-based payment arrangements	(2,601)	(1,952)	(2,804)
Loss (gain) on disposals of property and equipment	647	(513)	(313)
Gain associated with acquisition of land	(4,840)	0	0
Impairment of indefinite lived intangibles	0	1,629	0
Provision for doubtful accounts	3,152us-gaap_ProvisionForDoubtfulAccounts	4,227us-gaap_ProvisionForDoubtfulAccounts	3,532us-gaap_ProvisionForDoubtfulAccounts
Non-cash interest expense	2,012unfi_NoncashInterestExpense	651unfi_NoncashInterestExpense	0unfi_NoncashInterestExpense
Changes in assets and liabilities, net of acquired companies:
Accounts receivable	(70,717)	(37,295)	(51,193)
Inventories	(97,819)us-gaap_IncreaseDecreaseInInventories	(123,904)us-gaap_IncreaseDecreaseInInventories	(62,822)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	2,024	(17,702)	15,050
Accounts payable	28,205	34,974	16,095
Accrued expenses	12,627	12,080	12,540
Net cash provided by operating activities	62,419	44,331	66,244
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(147,303)	(66,554)	(31,492)
Purchases of acquired businesses, net of cash acquired	(211,574)	(8,135)	(3,297)
Proceeds from disposals of property and equipment	6,084	2,368	332
Net cash used in investing activities	(352,793)	(72,321)	(34,457)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under revolving credit line	853,884	610,046	1,021,517
Repayments of borrowings under revolving credit line	(568,338)us-gaap_RepaymentsOfLinesOfCredit	(594,107)us-gaap_RepaymentsOfLinesOfCredit	(1,021,517)us-gaap_RepaymentsOfLinesOfCredit
Repayments of long-term debt	(1,226)us-gaap_RepaymentsOfLongTermDebt	(353)us-gaap_RepaymentsOfLongTermDebt	(47,447)us-gaap_RepaymentsOfLongTermDebt
Increase in bank overdraft	11,501	6,347	8,673
Proceeds from exercise of stock options	2,215	1,942	7,571
Payment of employee restricted stock tax withholdings	(3,757)	(3,484)	(1,526)
Excess tax benefit from share-based payment arrangements	2,601	1,952	2,804
Capitalized debt issuance costs	(1,523)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	(2,905)us-gaap_PaymentsOfDebtIssuanceCosts
Net cash provided by (used in) financing activities	295,357	22,343	(32,830)
Effect of exchange rate changes on cash and cash equivalents	22	636	298
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	5,005	(5,011)	(745)
Cash and cash equivalents at beginning of period	11,111	16,122	16,867
Cash and cash equivalents at end of period	16,116	11,111	16,122
Supplemental disclosures of cash flow information:
Non-cash financing activity	0unfi_NoncashFinancingActivity	32,826unfi_NoncashFinancingActivity	0unfi_NoncashFinancingActivity
Non-cash investing activity	7,104unfi_NoncashInvestingActivity	32,826unfi_NoncashInvestingActivity	0unfi_NoncashInvestingActivity
Cash paid for interest	6,599us-gaap_InterestPaidNet	5,246us-gaap_InterestPaidNet	4,734us-gaap_InterestPaidNet
Cash paid for federal and state income taxes, net of refunds	$ 77,091us-gaap_IncomeTaxesPaidNet	$ 64,367us-gaap_IncomeTaxesPaidNet	$ 52,666us-gaap_IncomeTaxesPaidNet

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-Paragraph 9

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Amount of cash inflow (outflow) from long-term debt supported by a written promise to pay an obligation.

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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-Publisher FASB

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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- Definition

The value of restricted shares issued as compensation, net of the value of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

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No definition available.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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