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SUBSEQUENT EVENTS - Narrative (Details) - Subsequent Event ft² in Thousands	Feb. 06, 2019 ft²
Subsequent Event [Line Items]
Expansion of Ridgefield, Washington facility	541
Square footage of Ridgefield, Washington facility	800

X

- Definition

Additional Area of Real Estate Property

+ References

No definition available.

+ Details

Name:	unfi_AdditionalAreaofRealEstateProperty
Namespace Prefix:	unfi_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: