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SIGNIFICANT ACCOUNTING POLICIES - Changes in Insurance Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
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Jul. 29, 2023 | Jul. 30, 2022 | Jul. 31, 2021
Self Insurance Reserve Rollforward Abstract [Roll Forward] |  |  |
Beginning balance | $ 98 | $ 103 | $ 101
Expense | 52 | 44 | 48
Claim payments | (57) | (50) | (48)
Reclassifications | 4 | 1 | 2
Ending balance | $ 97 | $ 98 | $ 103

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- Definition Self Insurance Reserve, Claims + References No definition available. + Details
Name: | unfi_SelfInsuranceReserveClaims
Namespace Prefix: | unfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Self Insurance Reserve, Expense + References No definition available. + Details
Name: | unfi_SelfInsuranceReserveExpense
Namespace Prefix: | unfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Self Insurance Reserve, Reclassification to Receivables + References No definition available. + Details
Name: | unfi_SelfInsuranceReserveReclassificationtoReceivables
Namespace Prefix: | unfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Self Insurance Reserve Rollforward Abstract [Roll Forward] + References No definition available. + Details
Name: | unfi_SelfInsuranceReserveRollforwardAbstractRollForward
Namespace Prefix: | unfi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_SelfInsuranceReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant