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SIGNIFICANT ACCOUNTING POLICIES - Changes in Insurance Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 01, 2020 | Aug. 03, 2019 | Jul. 28, 2018
Self Insurance Reserve Rollforward Abstract [Roll Forward] |  |  |
Beginning balance | $ 88,838 | $ 24,703 | $ 22,776
Assumed liabilities from the Supervalu acquisition | 0 | 55,213 | 0
Expense | 44,125 | 42,764 | 14,274
Claim payments | (36,395) | (33,087) | (12,347)
Reclassifications | 4,177 | (755) | 0
Ending balance | $ 100,745 | $ 88,838 | $ 24,703

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- Definition Self Insurance Reserve, Acquisitions + References No definition available. + Details
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- Definition Self Insurance Reserve, Claims + References No definition available. + Details
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Namespace Prefix: | unfi_
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Balance Type: | debit
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- Definition Self Insurance Reserve, Expense + References No definition available. + Details
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- Definition Self Insurance Reserve, Reclassification to Receivables + References No definition available. + Details
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Namespace Prefix: | unfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Self Insurance Reserve Rollforward Abstract [Roll Forward] + References No definition available. + Details
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + 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 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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