XML 72 R50.htm IDEA: XBRL DOCUMENT
v3.20.4

DERIVATIVES - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Oct. 31, 2020 | Jan. 30, 2021
Derivative [Line Items] |  |
Payment to terminate interest rate swaps | $ 11,300,000 |
Derivative, notional value |  | $ 1,485,000,000.0
Gain (loss) resulting from termination of interest rate swaps | 0 |
Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative, notional value | 504,000,000.0 |
Forward Starting Interest Rate Swap |  |
Derivative [Line Items] |  |
Derivative, notional value | 450,000,000.0 |
Senior Notes due 2028, 6.750% |  |
Derivative [Line Items] |  |
Debt instrument, face amount | $ 500,000,000.0 |

X
- Definition Derivative, Gain (Loss) On Termination Of Derivative, Net + References No definition available. + Details
Name: | unfi_DerivativeGainLossOnTerminationOfDerivativeNet
Namespace Prefix: | unfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payment To Terminate Derivative Contract + References No definition available. + Details
Name: | unfi_PaymentToTerminateDerivativeContract
Namespace Prefix: | unfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=unfi_ForwardStartingInterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=unfi_SeniorNotesDue20286750Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |