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v3.21.2

SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets With Definite Lives (Details) | 12 Months Ended
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Jul. 31, 2021
Customer relationships | Minimum |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset, useful life | 7 years
Customer relationships | Maximum |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset, useful life | 20 years
Trademarks and tradenames | Minimum |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset, useful life | 2 years
Trademarks and tradenames | Maximum |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset, useful life | 10 years
Favorable operating leases | Minimum |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset, useful life | 2 years
Favorable operating leases | Maximum |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset, useful life | 8 years
Unfavorable operating leases | Minimum |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset, useful life | 2 years
Unfavorable operating leases | Maximum |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset, useful life | 8 years
Pharmacy prescription files |
Finite-Lived Intangible Assets [Line Items] |
Finite-lived intangible asset, useful life | 7 years

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksAndTradeNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=unfi_FavorableOperatingLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=unfi_UnfavorableOperatingLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=unfi_PharmacyPrescriptionFilesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |