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SUBSEQUENT EVENTS - Narrative (Details) - Subsequent Event ft² in Thousands | Feb. 06, 2019 ft²
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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

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- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- 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

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