XML 73 R49.htm IDEA: XBRL DOCUMENT
v3.5.0.2

SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES (Details 10) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2015 | Nov. 01, 2014 | Aug. 01, 2015
Extraordinary and Unusual Items [Abstract] |  |  |
Reduction to net sales | $ 7.7 | $ 1.6 | $ 9.3

X
- Definition Reduction in net sales + References No definition available. + Details
Name: | unfi_Reductioninnetsales
Namespace Prefix: | unfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ExtraordinaryAndUnusualItemsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration