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REVENUE RECOGNITION - Narrative (Details)	Oct. 30, 2021 channel store
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: