XML 85 R65.htm IDEA: XBRL DOCUMENT v3.21.2

FAIR VALUE MEASUREMENTS OF FINANCIAL INSTRUMENTS - Narrative (Details) $ in Millions	12 Months Ended
	Jul. 31, 2021 USD ($)
Fair Value Disclosures [Abstract]
Effect of one percent increase on fair value of interest rate fair value hedging instruments	$ 31
Effect of one percent decrease on fair value of interest rate fair value hedging instruments	$ 32

X

- Definition

Effect of One Percent Decrease on Fair Value of Interest Rate Fair Value Hedging Instruments

+ References

No definition available.

+ Details

Name:	unfi_EffectofOnePercentDecreaseonFairValueofInterestRateFairValueHedgingInstruments
Namespace Prefix:	unfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Effect of One Percent Increase on Fair Value of Interest Rate Fair Value Hedging Instruments

+ References

No definition available.

+ Details

Name:	unfi_EffectofOnePercentIncreaseonFairValueofInterestRateFairValueHedgingInstruments
Namespace Prefix:	unfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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