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SIGNIFICANT ACCOUNTING POLICIES - Discontinued Operations (Details) - store	3 Months Ended
	Jul. 31, 2021	May 01, 2021
Accounting Policies [Abstract]
Number of stores reclassified to continuing operations	2
Number of stores held for sale		4

X

- Definition

Number Of Stores Held For Sale

+ References

No definition available.

+ Details

Name:	unfi_NumberOfStoresHeldForSale
Namespace Prefix:	unfi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number Of Stores Reclassified To Continuing Operations

+ References

No definition available.

+ Details

Name:	unfi_NumberOfStoresReclassifiedToContinuingOperations
Namespace Prefix:	unfi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration