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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