Line Of Credit Facility, Borrowing Base, Eligibility Percent

No definition available.

Name:	unfi_LineOfCreditFacilityBorrowingBaseEligibilityPercent
Namespace Prefix:	unfi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Borrowing Capacity, Reserves

+ References

No definition available.

+ Details

Name:	unfi_LineOfCreditFacilityBorrowingCapacityReserves
Namespace Prefix:	unfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line Of Credit Facility, Maximum Borrowing Capacity, Optional Increase

+ References

No definition available.

+ Details

Name:	unfi_LineOfCreditFacilityMaximumBorrowingCapacityOptionalIncrease
Namespace Prefix:	unfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

+ Details

Name:	us-gaap_NotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unfi_ABLLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=unfi_ABLCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	unfi_BorrowingBaseEligibleAssetAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	unfi_BorrowingBaseEligibleAssetAxis=unfi_PharmacyReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	unfi_BorrowingBaseEligibleAssetAxis=us-gaap_CreditCardReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	unfi_BorrowingBaseEligibleAssetAxis=us-gaap_InventoriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

LONG-TERM DEBT - ABL Credit Facility (Details) - USD ($)	Apr. 29, 2023	Jul. 30, 2022	Jun. 03, 2022	Oct. 19, 2018
Debt Instrument [Line Items]
Notes payable	$ 2,022,000,000	$ 2,109,000,000
Debt issuance costs, net	23,000,000	$ 29,000,000
Letter of credit
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	144,000,000
Letter of credit \| ABL Loans
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	879,000,000
Line of credit \| Revolving credit facility \| ABL Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 2,600,000,000
Line of credit facility, maximum borrowing capacity, optional increase			750,000,000
Line of credit \| Revolving credit facility \| ABL Credit Facility \| Accounts receivable
Debt Instrument [Line Items]
Line of credit facility, borrowing base, eligibility percent				90.00%
Line of credit \| Revolving credit facility \| ABL Credit Facility \| Pharmacy receivable
Debt Instrument [Line Items]
Line of credit facility, borrowing base, eligibility percent				90.00%
Line of credit \| Revolving credit facility \| ABL Credit Facility \| Credit card receivable
Debt Instrument [Line Items]
Line of credit facility, borrowing base, eligibility percent				90.00%
Line of credit \| Revolving credit facility \| ABL Credit Facility \| Inventories \| Minimum
Debt Instrument [Line Items]
Line of credit facility, borrowing base, eligibility percent				90.00%
Line of credit \| Revolving credit facility \| ABL Credit Facility \| Inventories \| Maximum
Debt Instrument [Line Items]
Line of credit facility, borrowing base, eligibility percent				92.50%
Line of credit \| Revolving credit facility \| ABL Credit Facility \| United States
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity, reserves	100,000,000
Line of credit facility, current borrowing capacity	2,640,000,000
Debt issuance costs, net	$ 8,000,000
Line of credit \| Letter of credit \| ABL Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 100,000,000