XML 39 R27.htm IDEA: XBRL DOCUMENT
v3.8.0.1

SIGNIFICANT ACCOUNTING POLICIES Change in Estimate (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 28, 2018 | Apr. 28, 2018 | Apr. 29, 2017
Change in Accounting Estimate [Line Items] |  |  |
Net Sales growth percentage | 11.80% | 10.10% |
Inventory growth percentage |  | 15.90% |
Decrease to Accounts Payable | $ 20,900 | $ 6,396 | $ 79,023
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | $ 13,900 |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share | $ 0.27 |  |

X
- Definition Change in Accounting Estimate, Effect of Change on Diluted Earnings Per Share + References No definition available. + Details
Name: | unfi_ChangeinAccountingEstimateEffectofChangeonDilutedEarningsPerShare
Namespace Prefix: | unfi_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Change in Accounting Estimate, Effect of Change on Net Income + References No definition available. + Details
Name: | unfi_ChangeinAccountingEstimateEffectofChangeonNetIncome
Namespace Prefix: | unfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Inventory growth percentage + References No definition available. + Details
Name: | unfi_Inventorygrowthpercentage
Namespace Prefix: | unfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net sales growth percentage + References No definition available. + Details
Name: | unfi_NetSalesgrowthpercentage
Namespace Prefix: | unfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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_ChangeInAccountingEstimateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInAccountsPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration