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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
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Nov. 01, 2025 | Nov. 02, 2024 | Aug. 02, 2025
Revenue from Contract with Customer [Abstract] |  |  |
Accounts receivable, sale, authorized amount | $ 500 |  |
Accounts receivable on behalf of the financial institution | 394 |  | $ 380
Loss on sale of accounts receivable | $ 4 | $ 5 |

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- Definition Accounts Receivable, on Behalf of Financial Institution + References No definition available. + Details
Name: | unfi_AccountsReceivableOnBehalfOfFinancialInstitution
Namespace Prefix: | unfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accounts Receivable, Sale, Authorized Amount + References No definition available. + Details
Name: | unfi_AccountsReceivableSaleAuthorizedAmount
Namespace Prefix: | unfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of gain (loss) on sale of accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-5 + Details
Name: | us-gaap_GainLossOnSaleOfAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration