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REVENUE RECOGNITION - Narrative (Details) | Oct. 30, 2021 channel store
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Disaggregation of Revenue [Line Items] |
Number of customer channels | channel | 5
Chains |
Disaggregation of Revenue [Line Items] |
Number of stores | store | 10

X
- Definition Number Of Customer Channels + References No definition available. + Details
Name: | unfi_NumberOfCustomerChannels
Namespace Prefix: | unfi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ContractWithCustomerSalesChannelAxis=unfi_ChainsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |