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SIGNIFICANT ACCOUNTING POLICIES - Basis of Presentation (Details)	12 Months Ended
	Jul. 30, 2022 store
Accounting Policies [Abstract]
Number of stores sold	2

X

- Definition

Number Of Stores Sold

+ References

No definition available.

+ Details

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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