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SUBSEQUENT EVENTS (Details) - USD ($) | Aug. 31, 2018 | Apr. 29, 2016 | Aug. 30, 2018 | Jul. 28, 2018 | Jul. 29, 2017
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Subsequent Event [Line Items] |  |  |  |  |
sublimit of availability for letters of credit |  |  | $ 125,000,000 |  |
sublimit for short-term borrowings on a swingline basis |  |  | 100,000,000 |  |
Long-term Debt |  |  |  | $ 150,150,000 | $ 161,991,000
New ABL Loan Agreement |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Maximum borrowing base |  | $ 850,000,000.0 | 1,950,000,000.0 |  |
Proceeds from Lines of Credit | $ 600,000,000.0 | 600,000,000 |  |  |
UNFI Canada |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
sublimit of availability for letters of credit |  |  | 5,000,000 |  |
sublimit for short-term borrowings on a swingline basis |  |  | 3,500,000 |  |
UNFI Canada | New ABL Loan Agreement |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Maximum borrowing base |  | 50,000,000.0 | 50,000,000.0 |  |
Minimum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Maximum borrowing base |  | $ 10,000,000 | $ 10,000,000 |  |
Real estate backed term loan (gross of debt issuance costs) [Domain] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Long-term Debt |  |  |  | $ 110,000,000 |

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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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